Excimers XTRAC Laser Therapy is a successful treatment option for both of these conditions: Vitiligo: Patients with vitiligo experience patches of discolored skin as a result of the immune systems destruction of your bodys cells responsible for pigmentation. The Xtrac is FDA approved and highly safe for both children and adults. Excimer laser is an FDA approved device that uses a handheld laser wand to deliver a concentrated dose of ultraviolet light to the skin. Laser treatments for psoriasis and vitiligo are provided with the Excimer laser. However, the effects of treatment are not usually permanent, and it cannot always control the spread of the condition. Does the procedure hurt? Excimer Laser. About half, 44%, see results disappear within 1 year of stopping treatment. XTRAC is the first and only FDA-cleared excimer laser for improving psoriasis. The Ra Medical Systems Pharos Excimer Laser we use emits narrow band Ultraviolet B (UV-B) light and has been shown to promote re-pigmentation in ...

TY - JOUR. T1 - Deposition of nonlinear optical films of potassium titanyl phosphate (KTiOPO4) by pulsed excimer laser ablation) by Pulsed Excimer Laser Ablation. AU - Xiong, Fulin. AU - Hagerman, M.. AU - Zhou, H.. AU - Kozhevnikov, V.. AU - Wong, G. K.. AU - Poeppelmeier, K.. AU - Ketterson, J. B.. AU - Chang, R. P.H.. PY - 1994/7. Y1 - 1994/7. N2 - Nonlinear optical films of potassium titanyl phosphate (KTiOP04, or KTP) have been, for the first time, fabricated by pulsed excimer laser deposition on several substrates such as sapphire, Si(100) crystals, and fused quartz slides. The properties of the deposited KTP films, such as the chemical stoichiometry, crystallinity, effective index of refraction, and Raman response, have been extensively characterized. All of the results match the values of KTP crystals. The nonlinear optical property of the second harmonic generation of the films has been evaluated, showing a highefficiency comparable to a bulk value of KTP crystals. It is suggested that ...

This forms a population inversion between the two states. Most excimer lasers are of the noble gas halide type, for which the term excimer is strictly speaking a misnomer (since a dimer refers to a molecule of two identical or similar parts): The correct but less commonly used name for such is exciplex laser. The wavelength of an excimer laser depends on the molecules used, and is usually in the ultraviolet: Excimer lasers, such as XeF and KrF, can also be made tunable using a variety of prism and grating intracavity arrangements. Excimer lasers are usually operated with a pulse rate of around 100 Hz and a pulse duration of ~10 ns, although some operate as high as 8 kHz and 200 ns. For electric discharge pump see: Nitrogen laser. The high-power ultraviolet output of excimer lasers makes them useful for surgery (particularly eye surgery), for lithography for semiconductor manufacturing, and for dermatological treatment. However, when in an excited state (induced by an electrical discharge or ...

Excimer: Ablation on Human Hair The unparalleled precision of the excimer laser makes it uniquely suited to the task of refractive corneal surgery. Each pulse of the laser removes 0.25 microns of tissue. Think of it as slicing 1/200 of a human hair, 1/28 of a red blood cell, or 1/39 millionth of an inch in 4 billionths of a second. This allows the surgeon to literally sculpt the cornea, gently and precisely, into a more desirable shape that allows rays of light to focus properly on the retina.. Myopic Correction. As explained previously, patients with nearsightedness have corneas that are too steep for the length of their eyes. The excimer laser is used to flatten the cornea so that the light rays that pass through it come to a point of focus on the retina, rather than in front of it.. Hyperopic Correction. Patients with hyperopia have corneas that are too flat for the length of their eye. The excimer laser is used to steepen the cornea so that light rays are focused on the retina, rather than ...

TY - JOUR. T1 - Study of physico-chemical surface treatments on dyeing properties of polyamides. Part 2: Effect of UV excimer laser irradiation. AU - Yip, Yiu Wan. AU - Chan, K.. AU - Sin, K. M.. AU - Lau, K. S.. PY - 2002/1/1. Y1 - 2002/1/1. N2 - Polyamide (nylon 6) fabrics were irradiated with a 193 nm argon fluoride excimer laser and the effects on the dyeing properties of the fabrics were studied. Chemical analysis indicated that carbonisation occurred in the laser-irradiated samples. The laser treatment breaks the long chain molecules of nylon, increasing the number of amine end-groups which change the dyeing properties of acid and disperse dyes. The results suggest that laser treatment could be used to improve the dyeing properties of nylon fabric with a disperse dye.. AB - Polyamide (nylon 6) fabrics were irradiated with a 193 nm argon fluoride excimer laser and the effects on the dyeing properties of the fabrics were studied. Chemical analysis indicated that carbonisation occurred in the ...

The biological effects of excimer lasers and safety associated with their use were discussed. Excimer lasers operate in the 193 to 351 nanometer (nm) wavelength range producing short pulses of high energy ultraviolet (UV) radiation. They have been used to ablate tissues and nonbiological material to a small depth. As excimer lasers produce radiation in wavelengths where mutagenic and carcinogenic

Evaluation of the Efficacy of Excimer Laser Ablation of Cross-Linked Porcine Cornea. . Biblioteca virtual para leer y descargar libros, documentos, trabajos y tesis universitarias en PDF. Material universiario, documentación y tareas realizadas por universitarios en nuestra biblioteca. Para descargar gratis y para leer online.

The patients will have a comprehensive eye examination once they express an interest in the study. This includes a slit lamp examination of the front of the eye and a dilated fundoscopic examination of the back of the eye. if there is any pathology noted that would exclude the patient from the study, then we will inform the patient and make an appropriate referral. If the patient is deemed appropriate for the study after a comprehensive examination included computerized videokeratography, then they can be enrolled. The patient will undergo bilateral simultaneous eye surgery. Which eye is treated with a wavefront-guided excimer laser and which eye is treated with wavefront-optimized will be randomized so there is a 50% chance for either eye to receive one treatment. The patients will be seen on the day of surgery, post op day one, post op day 4-7, one month, three months, six months and one year. The patient will receive topical antibiotics in each eye for one week following the procedure. LASIK ...

Purpose.: The role of microRNA (miRNA) regulation in corneal wound healing and scar formation has yet to be elucidated. This study analyzed the miRNA expression pattern involved in corneal wound healing and focused on the effect of miR-133b on expression of several profibrotic genes. Methods.: Laser-ablated mouse corneas were collected at 0 and 30 minutes and 2 days. Ribonucleic acid was collected from corneas and analyzed using cell differentiation and development miRNA PCR arrays. Luciferase assay was used to determine whether miR-133b targeted the 3′ untranslated region (UTR) of transforming growth factor β1 (TGFβ1) and connective tissue growth factor (CTGF) in rabbit corneal fibroblasts (RbCF). Quantitative real-time PCR (qRT-PCR) and Western blots were used to determine the effect of miR-133b on CTGF, smooth muscle actin (SMA), and collagen (COL1A1) in RbCF. Migration assay was used to determine the effect of miR-133b on RbCF migration. Results.: At day 2, 37 of 86 miRNAs had ...

A rare gas-halogen excimer laser in which the laser gases are exposed virtually only to metal and ceramic, thereby reducing contamination of the gases and optics. In one preferred embodiment magnetic fluid seals (56) are used to isolate the bearings (58) supporting the shaft (46) upon which the tangential fan (44) rotates so that the lubricated bearings do not contaminate the laser gases. The fan (44) uses magnetic coupling (70, 76) so that an isolating enclosure may be placed over the seal to prevent the leakage of gases into the environment should the seal fail. An excimer laser that is therefore both safe enough to be used in medical and industrial applications as well as reliable may be fabricated.

A synthetic glass member for use in excimer laser lithography, having superior homogeneity, high transmittance for ArF excimer laser beams and an excellent resistance against lasers is made from high purity synthetic quartz glass, and it is characterized in that layered structures, striae in three directions and internal strains are thermally and mechanically removed, the distribution of refractive index (.DELTA.n) in a plane orthogonal to the optical axis is up to about 1.times.10.sup.-6, the distribution of refractive index (.DELTA.n) in a plane parallel to the optical axis is up to about 5.times.10.sup.-6, the birefringence is up to about 2 nm/cm, the hydrogen molecule concentration is at least about 2.times.10.sup.17 molecules/cm.sup.3, and the internal transmittance is at least about 99.8% at a wavelength of 193.4 nm.

Purpose: : To evaluate efficacy and safeness of femtosecond laser assisted LASIK to correct congenital hyperopic defects. Methods: : from May 2007 to April 2011, 116 eyes of 67 patients (divided in three groups: A, B, C) were submitted to femtosecond assisted LASIK. In the group A (86 eyes of 49 patients, 29M, 20F; mean age: 40.24yrs ±9.21SD) the operation was carried on with a 60kHz femtosecond laser and the ablation was carried on dry stroma with a Technolas 217c excimer laser for a mean refractive error in SE of +3.34D ±1.24SD (range: +0.75 / +7.25), mean cylinder of +1.60 ±1.48SD (range: +0.50 / + 5), mean UCVA of 0.58 ±0.21SD and mean BSCVA of 0.98 ±0.06SD; the mean laser refractive treatment in SE was of +3.02D ±1.24SD. In the group B (17 eyes of 10 patients, 5M, 5F, mean age: 26.76yrs ±8.79SD), the operation was carried on with a 150kHz femtosecond laser and with a VISX S4 excimer laser, for a mean refractive error in SE of +3,69D ±1.16SD (range: +2 / +6), mean cylinder of +1.85D ...

Femtosecond Laser-Assisted Cataract Surgery from Trusted LASIK Surgeons. Trusted LASIK Surgeons helps patients finding all types of eye care services in the United States.

Purpose: To describe a technique that allows performing femtosecond laser-assisted cataract surgery with the LenSx laser (Alcon) in patients with poor or non dilating sma..

PurposeTo evaluate the refractive and visual results of one-stage laser-assisted in situ keratomileusis with femtosecond laser (Femto-LASIK) for the correction of residual ametropia after deep anterior lamellar keratoplasty (DALK).MethodsThis retrospective study included 13 eyes of 12 patients, who underwent corneal Femto-LASIK to correct refractive errors after DALK. IntraLase FS150 was used to create a lamellar flap and excimer laser ablation for refractive correction was performed using the Star S4 IR Excimer Laser in eight cases and the Technolas 217z Excimer Laser in Tissue Saving mode in five cases ...

What is the Excimer?. The XTRAC excimer delivers a highly targeted therapeutic beam of UVB light to treat psoriasis and vitiligo. Although it is often called a laser, it is actually not a laser, but a light therapy which safe on children as well. Quick and virtually painless without the troublesome side effects of other treatment options, its simply a better way to long-lasting results.. Since receiving FDA clearance in 2000, the XTRAC Excimer Laser has come to be recognized by dermatologists worldwide as the market leader in treatment of psoriasis, vitiligo, and atopic dermatitis. It uses a sophisticated liquid light guide system to deliver a targeted, super-narrow UVB band to affected areas. ...

Excimer laser sources have already been used with success for a number of novel material processing procedures. Most promising of these deal effectively with challenging materials for which little can be done with ordinary tools in order to materialize their potential. In this presentation, attention is focused on excimer irradiation processing of high grade sintered alumina. On one hand, it is shown how effective and unique can be an excimer beam in transforming the surface of this heavily used material. Under specific irradiation conditions, surface melting of sintered alumina is obtained. The resulting material is then studied by low-angle X-ray diffraction which reveals in particular the eventual formation of the uncommon gamma-alumina phase within 10 nm from the material surface. On the other hand, a rather thorough investigation of the phenomenology of the gamma-phase synthesis is presented, stressing various aspects: dynamic, energetic, structural and chemical, all of them stemming from ...

BACKGROUND AND OBJECTIVE: Vitiligo is commonly treated with PUVA, and more recently, narrow-band UVB (NBUVB) phototherapy. Given the proximity of the wavelengths of NBUVB (311 nm) and the excimer laser (308 nm), we undertook a clinical trial to test

This paper reviews the potential role of excimer lasers in corneal surgery. The morphology of incisions induced by two wavelengths of excimer laser radiation, 193 nm and 248 nm, are compared with the morphology of incisions produced by diamond and steel knives. Analysis suggests that ablation induced by excimer laser results from highly localised photochemical reactions and that 193 nm is the optimal wavelength for surgery. The only significant complication of laser surgery is loss of endothelial cells when incisions are within 40 micron of Descemets membrane. ...

What is excimer laser? Who are the candidates? Therapeutical application of Excimer laser - PTK How does it look like? How to plan examination? LATEST IN SVETI VID-WOW! LASER Excimer laser - Schwind Amaris- SmartPuls/SmartSurf ACE touch free T-PRK

We have measured the stability of a variety of photodiodes exposed to 157-nm light from a pulsed excimer laser by using a radiometry beamline at the Synchrotron Ultraviolet Radiation Facility at the National Institute of Standards and Technology. The intense, pulsed laser light exposed the photodiodes, whereas the low-intensity, continuously tunable light from the synchrotron source measured changes in the characteristics of the photodiodes, such as in the responsivity and the reflectance from the surface of a photodiode. Photodiodes studied include both silicon pn-junction and Schottky-barrier types. Among these photodiodes, we found that the damage mechanism for photodiodes with SiO2-based passivating layers is mainly the buildup of SiO2-Si interface trap states. The interface trap state buildup is well known for other semiconductor devices and is generally recognized as a product induced by radiation with an energy more than the 9-eV SiO2 bandgap energy rather than the 7.9-eV energy of the ...

Excimer Laser Therapy is used to treat vitiligo, psoriasis, dermatitis, alopecia & many other conditions. Contact Kessel Dermatology for a consultation today!

Methods: The average age of the 40 patients (32 men, 8 women) included in this study was 65.4±9.1 years. The average occlusion length was 17.5 cm (range: 12-25 cm). The initial recanalization attempts were performed with stiff Terumo guidewires (curved or straight) supported by various catheters (straight/multipurpose/Cobra). After the unsuccessful attempt, an excimer laser catheter (catheter diameters from 1.7-2.5 mm) was used for recanalization using the step-by-step method of crossing. After successful crossing, balloon dilatation was performed in all cases. Stent implant was required in 10% (4/40) of procedures. Patients were followed for 12 months with colour-coded Duplex sonography (CCDS ...

This trial investigated the efficacy and safety of combination of Clobex [clobetasol] spray with Excimer laser therapy [Photomedex XTRAC Velocity] in the

Fingerprint Dive into the research topics of Phase field modeling of excimer laser crystallization of thin silicon films on amorphous substrates. Together they form a unique fingerprint. ...

Reportage on refractive eye surgery at the Adolphe de Rothschild Ophthalmology Foundation in Paris, France. Eye surgery using a femtosecond laser and excimer laser. The femtosecond laser slices the cornea to create a corneal cap (purple) then the surgeon lifts the flap to treat the eye with the excimer laser. The cornean flap is then put back in place without stitches. This technique is used to treat myopia, presbyopia, astigmatism and farsightedness. The excimer laser screen. - Stock Image C024/5919

PRK (Photo Refractieve Keratectomy), Lasek (Laser assisted subepitheliale keratectomy) , Epilasik en TransPRK zijn oppervlakkige excimer laser correcties. Ze verschillen onderling zo weinig dat we ze onder een noemer zullen bespreken. De oppervlakkige, subepitheliale technieken worden wereldwijd toegepast om bijziendheid (myopie), verziendheid (hyperopie) en cilinderafwijkingen (astigmatisme) te corrigeren.. Het epitheel (hoornvliesoppervlak) wordt verwijderd (PRK), losgeweekt met alcohol en opzij geschoven (Lasek) of mechanisch opzijgeschoven met een microkeratoom (Epilasik), of door de excimerlaser (TransPRK)wordt verwijderd, waarna computer gestuurd de hoornvlies vorm wordt geremodelleerd met excimer laser, om de gewenste brilsterkte in het hoornvlies aan te brengen. De behandeling vindt plaats onder locale verdoving met druppels.. De lange termijn resultaten zijn voorspelbaar en stabiel. Echter de eerste 2-3 dagen na de behandeling kan de client klachten ondervinden van lichtschuwheid, oog ...

Methods 19 human corneoscleral rims were divided into six groups, mounted on an anterior chamber maintainer and cut with a femtosecond laser programmed to the following patterns: zigzag (A), mushroom (B) and top hat (C) in both full (1) and partial (2) thicknesses. The pressure required to produce leakage from the corneal incision was then measured. Eight additional corneas were cut with the zigzag pattern: four full and four partial thickness, prepared and transported per standard eye bank protocol, and analysed for endothelial cell loss with trypan blue staining and digital image analysis.. ...

Poster: The role of modern diagnostics in the selection of successful toric IOL to the patient who has undergone keratoplasty: a clinical ...

Relative effectiveness assessment of Femtosecond laser-assisted cataract surgery (FLACS) compared to standard cataract surgery This is the final project plan of the assessment on Relative effectiveness assessment of Femtosecond laser-assisted cataract surgery (FLACS) compared to standard cataract surgery and the comments ...

During the XXXV Congress of the ESCRS, an international panel of expert FLACS users gathered to share their research and insights, and to learn from the experiences of their colleagues.

During the XXXV Congress of the ESCRS, an international panel of expert FLACS users gathered to share their research and insights, and to learn from the experiences of their colleagues.

Is LASIK Right for You? LASIK can treat people who: Are at least 18 years old Are not pregnant or nursing Are in good general health Have a stable prescription Have no eye diseases

For patients that have too thin of a cornea for LASIK treatment, there are other options that our doctors will recommend such as LASEK and PRK, which produces similar eye treatment results. Both treatments involve the complete removal of the epithelium (superficial layer of the cornea) before the excimer laser treatment. With LASEK, the epithelium is returned to its original position after the surgery. PRK is a bit different because the eye is covered right after surgery to allow new epithelial cells to generate. These are great alternative methods to produce permanent eye correction results. Unlike LASIK, LASEK and PRK generally requires a few days of rest so that the eye can heal. Our doctors will provide information for the best treatment available for you.. Blade-Free LASIK. The Intralasik process is very comfortable. It is a method that has been applied with eminent effects on hundreds of thousands of eyes and you are able to intrust this innovative technology. We deliver exceptional ...

LASIK is hybrid procedure, combining the ALK technique with the accuracy of the Excimer Laser. First the doctor will use an instrument called a Hansatome Microkeratome to create a thin surface-flap under a microscope this will only take a few seconds. Then the Excimer Laser, which has been pre-programmed with your exact correction, applies a rapid, cool ultraviolet light that precisely sculpts a very small amount of the sub-surface of the cornea. These short laser pulses correct the curvature of the cornea, allowing images to be focused clearly on the retina. The flap is then smoothed back down where it quickly bonds back in place, restoring a smooth, intact surface. ...

Background: Phototherapeutic keratectomy (PTK) has been employed as a surgical tool to treat corneal disease for more than 10 years. The laser has made it possible to remove superficial corneal opacities and thereby restore vision. The 193 nm ultraviolet light separates molecules and splits molecules in biological tissue, thereby ablating it. About 0.25 ╡m of tissue is ablated by each pulse. The development of the excimer laser technique has been fast. It has principally focused on refractive surgery but has also benefited PTK. Corneal dystrophies: The ability to delay or postpone corneal grafting in superficial corneal dystrophies represents a very important achievement. Map-dot-fingerprint dystrophy or basal membrane dystrophy is a common indication for PTK. Other dystrophies such as Meesmans, Reis-Bⁿcklers, Thiel-Benkes, granular, macular, lattice and Schnyders can be treated, although with differing degrees of success and varying rates of recurrence. Subepithelial scarring in Fuchs ...

Background: Phototherapeutic keratectomy (PTK) has been employed as a surgical tool to treat corneal disease for more than 10 years. The laser has made it possible to remove superficial corneal opacities and thereby restore vision. The 193 nm ultraviolet light separates molecules and splits molecules in biological tissue, thereby ablating it. About 0.25 ╡m of tissue is ablated by each pulse. The development of the excimer laser technique has been fast. It has principally focused on refractive surgery but has also benefited PTK. Corneal dystrophies: The ability to delay or postpone corneal grafting in superficial corneal dystrophies represents a very important achievement. Map-dot-fingerprint dystrophy or basal membrane dystrophy is a common indication for PTK. Other dystrophies such as Meesmans, Reis-Bⁿcklers, Thiel-Benkes, granular, macular, lattice and Schnyders can be treated, although with differing degrees of success and varying rates of recurrence. Subepithelial scarring in Fuchs ...

LASEK, pronounced lay-SEK, is a variant of the original excimer laser vision correction procedure called photo-refractive keratectomy (PRK); the procedure first approved for simple myopia by the FDA in 1995. It differs from LASIK in that no flap is created and that the sculpting of the corneal tissue which results in visual improvement is delivered in its more superficial layers. Visual recovery is similar to PRK and is not as rapid as that which occurs with LASIK, taking 3-7 days in comparison with the typical 24 hour recovery with LASIK.. Because of the rich innervation of the cornea, marked discomfort occurs whenever the cornea has a break in its surface layer. However, since the protective surface layer of the cornea, called the epithelium, grows back when disrupted, it must be removed to deliver the corrective laser treatment. It then takes anywhere between two and four days for this re-growth of the epithelium to occur.. LASEK differs from PRK only in its handling of the epithelium. In ...

Installation C Task Force: D. Anglos. Installation C provides access to three excimer lasers with pulse energies up to 600mJ at 150Hz, resulting in focused intensities of 109-1010 W/cm2. They are used mainly for various material processing studies, in certain cases complemented by two low-power CO2 lasers as needed. The emphasis in Installation C is on the offering of workstations oriented to specific application areas of technological interest. In that respect Installation C also provides access to a wide range of material characterisation facilities for the evaluation of the results.. Excimer laser material processing workstations. Thin Film Deposition stations. The main technique employed for the deposition of thin films, the Pulsed Laser Deposition (PLD), is realized by experimental setups dedicated to the study of the principles involved and emphasis is placed on capability for growth of specific coatings. The workstations are modular in nature and allow for configurations to work on a ...

A semiempirical model of a pulsed, injection-controlled laser is investigated analytically and is applied primarily to extensive experimental results that

International Journal of Engineering Inventions (IJEI) provides a multidisciplinary passage for researchers, managers, professionals, practitioners and student…

Femtosecond laser-assisted cataract surgery seems to be a major step forward as a result of the added safety and precision that the laser confers, such as to the creation of the incision, relaxing incisions, capsulorhexis, and nuclear removal steps.

FLIVC (Femtosecond Laser Intrastromal Vision Correction) is a laser eye surgery technology that is one of several possible alternatives to LASIK now under investigation. Lower-energy femtosecond lasers may improve upon the traditional excimer laser by reducing disruption of ocular structures, with intrastromal ablation obviating the need for the damaging epithelial incision and ablation currently employed in LASIK and PRK procedures.read more at IntraLASIK ...

Husted RC, thromboxanes, and leukotrienes generated from arachidonic acid by way of the cyclooxygenase and lipoxygenase pathways are believed to be significant biologic mediators of pain after excimer laser surgery. 4 30 Оm basal cell cmbalta basal cell passing into prickle cell layer takee about to flake off from surface keratinized squames granular cell layer prickle cell layers basal cell layer basal lamina connective can you take ritalin with cymbalta of dermis The cellular arrangement and differentiation in skin. 4.

The LASIK Process The Procedure At the start of surgery, anaesthetic eye drops are applied. Once the eye is numbed, an eyelid speculum is inserted to prevent the eyelids from blinking. Next, a thin flap is created in the outer layer of the cornea, using either a specialised mechanical blade (microkeratome) or a femtosecond laser. A little pressure or tightness may be felt at this stage. Next, the hinged corneal flap is lifted, exposing the treatment area. You will be prompted to look and focus on an overhead target light while the excimer laser is applied to the treatment area. A loud noise and a slight smell may occur during the application. Finally, the flap is repositioned upon completion and allowed to adhere, stitch-free. The eyelid speculum is removed at this stage. The whole treatment lasts approximately 15 minutes for each eye. Once the anaesthetic eye drops wear off, the eye will feel quite gritty and irritable for a few hours. Frequent application of lubricating eye drops is useful. It ...

The first observation to the authors knowledge of excimer molecules formed by reactive kinetics in a laser-produced plasma is reported. Emission from XeF at 351 nm and a new ionic excimer (XeRb)+ at 165 nm have been observed.. © 1989 Optical Society of America. Full Article , PDF Article ...

Journal of Refractive Surgery | ABSTRACTBACKGROUND: Excimer laser photorefractive keratectomy tor the correction of myopia is presently under investigation in the United States by the Food and Drug Administration (FDA). The Phase 1 1 -B FDA study is being conducted on 75 normally sighted myopic eyes utilizing three currently available excimer lasers. This report presents the 1 -year results on 12 myopic eyes treated with the

C H A P T E R 1 4 Excimer Laser Photorefractive Keratectomy for Keratoconus Arun C. Gulani, MD; Lee T. Nordan, MD; Noel Alpins, FRANZCO, FRCOphth, FACS; and George Stamatelatos, BSCOptom P atients with

TY - JOUR. T1 - Epithelial healing and clinical outcomes in excimer laser photorefractive surgery following three epithelial removal techniques. T2 - Mechanical, alcohol, and excimer laser. AU - Lee, Hyung Keun. AU - Lee, Kyung Sub. AU - Kim, Jin Kook. AU - Kim, Hyeon Chang. AU - Seo, Kyung Ryul. AU - Kim, Eung Kweon. PY - 2005/1/1. Y1 - 2005/1/1. N2 - To evaluate epithelial healing, postoperative pain, and visual and refractive outcomes after photorefractive keratectomy (PRK) using three epithelial removal techniques. Prospective, nonrandomized, comparative trial. setting: Department of Ophthalmology, Yonsei University College of Medicine and Balgensesang Ophthalmology Clinic, Seoul, Korea. interventions: For the PRK procedure, the corneal epithelium was removed in one of three ways: mechanically (conventional PRK [PRK]) in 88 eyes of 44 patients; using excimer laser (transepithelial PRK [tPRK]) in 106 eyes of 53 patients; or using 20% diluted alcohol, laser-assisted subepithelial ...

Searching for the cost of Photorefractive Keratectomy in Nairobi? Contact Lyfboat to Get an Expert Second Opinion & Personalised Quote for Photorefractive Keratectomy from the best Photorefractive Keratectomy hospitals in Nairobi. We enable patients to connect, communicate and find quality healthcare for Photorefractive Keratectomy in Nairobi.

Get information, facts, and pictures about Photorefractive keratectomy at Encyclopedia.com. Make research projects and school reports about Photorefractive keratectomy easy with credible articles from our FREE, online encyclopedia and dictionary.

Photorefractive keratectomy: measuring the matrix metalloproteinase activity and chondroitin sulfate concentration in tear fluid Tetsuya Mutoh, Masaya Nishio, Yukihiro Matsumoto, Kiyomi Arai, Makoto ChikudaDepartment of Ophthalmology, Dokkyo Medical University Koshigaya Hospital, Saitama, JapanAbstract: We herein report the case of a 20-year-old man who underwent a photorefractive keratectomy (PRK). We measured matrix metalloproteinase-9 (MMP-9) activity and chondroitin 4 sulfate and chondroitin 6 sulfate concentrations in tear fluid. Tear fluid was collected preoperatively via microcapillary tube, and was collected postoperatively on the first and fourth days, and after one week, one month, three months, and six months. Samples were formulated by dilution with 200 µL of saline. MMP-9 activity was analyzed by an enzyme immunocapture activity assay, and the concentrations of chondroitin sulfate were analyzed by enzyme-linked immunosorbent assay. No complications were observed after surgery, except for a

If you have thin corneas and were told you were not a candidate for laser-assisted in situ keratomileusis, or LASIK (a corneal refractive procedure that requires the creation of a partial-thickness flap before the cornea is sculpted with a laser), PRK (Photorefractive Keratectomy) may be a good option for you ...

If you have thin corneas and were told you were not a candidate for laser-assisted in situ keratomileusis, or LASIK (a corneal refractive procedure that requires the creation of a partial-thickness flap before the cornea is sculpted with a laser), PRK (Photorefractive Keratectomy) may be a good option for you ...

If you have thin corneas and were told you were not a candidate for laser-assisted in situ keratomileusis, or LASIK (a corneal refractive procedure that requires the creation of a partial-thickness flap before the cornea is sculpted with a laser), PRK (Photorefractive Keratectomy) may be a good option for you ...

If you have thin corneas and were told you were not a candidate for laser-assisted in situ keratomileusis, or LASIK (a corneal refractive procedure that requires the creation of a partial-thickness flap before the cornea is sculpted with a laser), PRK (Photorefractive Keratectomy) may be a good option for you ...

If you have thin corneas and were told you were not a candidate for laser-assisted in situ keratomileusis, or LASIK (a corneal refractive procedure that requires the creation of a partial-thickness flap before the cornea is sculpted with a laser), PRK (Photorefractive Keratectomy) may be a good option for you ...

John Michael Garrett M.D. graduated from Indiana University School of Medicine in 1973. After completing a 2-year Internship and Internal Medicine Residency at the University of South Florida in Tampa, Dr. Garrett completed a 3 year residency in Ophthalmology at the Medical College of Georgia, in Augusta. He followed this with a fellowship in microsurgery, including Phaco-emulsification cataract removal and corneal transplant techniques under Richard Schulze M.D., in Savannah, Georgia. Upon completion, he began an Ophthalmology practice here in Iron Mountain, opening in January 1979.. As a Board certified eye surgeon, Dr. Garrett has performed thousands of cataract and glaucoma procedures, as well as thousands of laser operations for glaucoma, diabetic eye disease, and retinal diseases.. As an accomplished refractive surgeon, Dr. Garrett has had additional training in Refractive Surgery including Radial Keratotomy (RK), Astigmatic Keratotomy (AK), Excimer Laser Photorefractive Keratectomy (PRK), ...

The hypothesis of this study is that excimer (308-nm UVB) laser added to either tazarotene 0.1% gel or acitretin 25 mg daily will lead to improved efficacy of these treatments alone.. The primary objective of this study is to compare the improvement of psoriatic plaques with and without excimer laser (308-nm UVB) treatment, applied in a randomized and blinded fashion, in subjects on acitretin 25 mg or tazarotene gel 0.1% QD. The primary endpoint will be the comparison between the change in NPF score of plaques treated with excimer laser and those treated with sham treatment.. The secondary objectives are to compare the number of excimer light treatments and time necessary to achieve an average lesion assessment score of 0 to 1 in subjects treated with acitretin 25 mg PO or tazarotene gel 0.1% QD, and to evaluate adverse events related to combinations of the study treatments. ...

Optical ray tracing-guided myopic laser in situ keratomileusis: 1-year clinical outcomes Arthur B Cummings,1 Gabrielle E Kelly21Wellington Eye Clinic, Dublin, Ireland; 2School of Mathematical Sciences, University College Dublin, Dublin, IrelandPurpose: To compare the safety, efficacy, and predictability of laser in situ keratomileusis treatments at 1 year postprocedure using a novel geometric ray tracing algorithm with outcomes of treatments using wavefront-optimized, wavefront-guided, and topography-guided ablation profiles of an excimer laser (WaveLight GmbH, Erlangen, Germany; Alcon Laboratories, Fort Worth, TX, USA).Setting: Wellington Eye Clinic, Dublin, Ireland.Design: Retrospective comparative case series.Methods: Eyes having a preoperative myopic spherical equivalent refractive error >4.00 D and/or astigmatism between 2.00–6.00 D resulting in a spherical equivalent power greater than −4.00 D received laser in situ keratomileusis treatments using a ray tracing algorithm. Refractive

Another way to right a persons vision or refractive error is through PRK or photorefractive keratectomy. Even though PRK is an earlier kind of refractive procedure, it is still commonly employed as an option to LASIK.

The excimer laser was invented in the 70s and uses a combination of two gases and electrical stimulation to create a laser light in the UV range. Currently, the most widespread therapy for the repigmentation of vitiligo spots relies on narrow band UV radiation with a wavelength of 311nM (nbUVB), emitted by a medical light bulb. This light can also be produced using excimer technology, with the advantage of lasers precision, controlled dosage and good response from the skin.. In practice, during a UV treatment session using a UV wand, the patient exposes both vitiligo patches and healthy skin to the light, over time, increasing the contrast between the two. With excimer technology, the light exposure is limited to the treatment area and can be precisely controlled. The laser spot size is 2x2 cm making this therapy appropriate for the treatment of both small and medium sized areas.. While conventional UV therapy is time consuming and requires many sessions to see results, excimer reports ...

A pulsed beam from an excimer laser is used for precision ablation of cadmium telluride (CdTe) and other materials to fabricate and delineate devices in electronic microcircuit structures. The fluence of the beam may be adjusted to selectively remove one constituent of the material, such as cadmium vs. tellurium, at a higher rate than the other constituent, while maintaining the integrity of the material surface. The beam may selectively remove an epitaxial layer of CdTe, CdZnTe, or HgCdTe from a GaAs substrate. The beam may be directed through a projection mask and optical system onto a material to form an image for patterned ablation. The optical system may focus an image of the mask on the material to form vertical sidewall patterns, or slightly defocus the image to form curved sidewall patterns and/or concave and convex lens structures for optical arrays.

Like LASIK, PRK works by reshaping the cornea using an excimer laser, the main difference is the first step of the procedure. With PRK, the thin outer layer of the cornea (epithelium) is removed and discarded, prior to reshaping the underlying corneal tissue with the excimer laser. The epithelium repairs itself by growing back over the corneal surface within a few days after surgery. The procedure typically takes about 20 minutes.. ...

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Surgical correction of refractive errors is becoming increasingly popular. In the 1990s, the excimer laser revolutionized the field of corneal refractive surgery with PRK and LASIK, and lately refractive lenticule extraction (ReLEx) of intracorneal tissue, using only a femtosecond laser, has become possible. Two new procedures were developed, ReLEx flex (FLEX) and ReLEx smile (SMILE). Until this thesis, only a few long-term studies of PRK with a relatively limited number of patients had been published; therefore, this thesis intended to retrospectively evaluate long-term outcomes after PRK for all degrees of myopia for a large number of patients. Furthermore, a prospective contralateral eye study comparing FLEX and SMILE, when treating high to moderate degrees of myopia, had not been performed prior to this study. This was the second aim of this thesis. In the first study, results from 160 PRK patients (289 eyes) were presented. Preoperative spherical equivalent ranged from -1.25 to -20.25D, ...

stream Whitton ME, Ashcroft DM, Gonzalez U. The XTRAC excimer laser treatment system from PhotoMedex is the first FDA market-cleared laser treatment for psoriasis and vitiligo. Some patients, however, experience a reaction similar to sunburn or blistering at the site of the treated area and in some cases, an increase in pigmentation may occur. Due to complex insurance regulations and a large number of treatment facilities it is important that one of our XTRAC specialists is able to speak with you and allow our team to work on your behalf for rapid insurance approval and quick results for the patient. The therapy will make it possible for you to reduce symptoms associated with vitiligo and improve flare quicker. Schedule Appointment Today 1-800-908-1044 ... XTRAC is also endorsed by the National Psoriasis Foundation and the technology is part of the approved clinical protocols … All patients in the study noticed improvement in their scalp psoriasis and 49% of the patients obtained a greater ...

On June 21, 2002, uneventful LASIK was performed OS first followed by OD seven days later on June 28, 2002. There were no intraoperative complications. Excimer laser ablation was performed with a VISX Star S3 IR Excimer Laser System (VISX Technology, California) after a superiorly hinged flap was made with a Hansatome microkeratome (Bausch & Lomb, Rochester, NY) using a 9.5-mm suction ring. A 160 micron Hansatome head was used being that it provided the thinnest available cut at the time of surgery. Intraoperative pachymetry was performed after lifting the flap, taking 3 central measurements, and recording the lowest. The residual stromal bed was calculated by obtaining the lowest central pachymetry and deriving the ablation depth from the laser. In this patient, the targeted flap thickness of 160 micrometers resulted in a measured flap thickness of 124 micrometers OD and 153 micrometers OS, thinner than the corresponding settings on the microkeratome. Hence, the calculated residual stromal bed ...

On June 21, 2002, uneventful LASIK was performed OS first followed by OD seven days later on June 28, 2002. There were no intraoperative complications. Excimer laser ablation was performed with a VISX Star S3 IR Excimer Laser System (VISX Technology, California) after a superiorly hinged flap was made with a Hansatome microkeratome (Bausch & Lomb, Rochester, NY) using a 9.5-mm suction ring. A 160 micron Hansatome head was used being that it provided the thinnest available cut at the time of surgery. Intraoperative pachymetry was performed after lifting the flap, taking 3 central measurements, and recording the lowest. The residual stromal bed was calculated by obtaining the lowest central pachymetry and deriving the ablation depth from the laser. In this patient, the targeted flap thickness of 160 micrometers resulted in a measured flap thickness of 124 micrometers OD and 153 micrometers OS, thinner than the corresponding settings on the microkeratome. Hence, the calculated residual stromal bed ...

TY - JOUR. T1 - Corneal Aberrations and Visual Acuity After Laser In Situ Keratomileusis. T2 - Femtosecond Laser Versus Mechanical Microkeratome. AU - Calvo, Ramón. AU - McLaren, Jay W.. AU - Hodge, David O.. AU - Bourne, William M.. AU - Patel, Sanjay V.. N1 - Funding Information: Funding/support was provided by National Institutes of Health, Bethesda, Maryland (Grant EY 02037 ; W.M.B.); Research to Prevent Blindness, Inc, New York, New York (S.V.P. as Olga Keith Wiess Special Scholar, and an unrestricted departmental grant); and Mayo Foundation, Rochester, Minnesota. The authors indicate no financial conflict of interest. Involved in design of the study (J.W.M., W.M.B., S.V.P.); conduct of the study (J.W.M., W.M.B., S.V.P.); collection (R.C., J.W.M., S.V.P.), management (R.C., J.W.M., S.V.P.), analysis (R.C., J.W.M., D.O.H., S.V.P.), and interpretation (R.C., J.W.M., D.O.H., W.M.B., S.V.P.) of the data; and preparation (R.C., S.V.P.), review (R.C., J.W.M., D.O.H., W.M.B., S.V.P.), and ...

Most patients who are over the age of 21 and in good health with no other eye conditions or diseases are generally considered good candidates for LASIK. LASIK is approved by the FDA to treat a broad range of vision problems, including nearsightedness, farsightedness and astigmatism. However, some people may not be good candidates for LASIK because of their unique visual imperfections or because of the results of a comprehensive eye examination. For those who do not qualify for LASIK, there are several LASIK alternatives available:. PRK - Photorefractive keratectomy (PRK) uses an excimer laser just like LASIK and provides comparable results. The main difference between PRK and LASIK is that in PRK there is no flap - only the very top (epithelial) layer of the cornea is removed (or moved aside) before the excimer laser reshapes the corneal tissue. After reshaping, a bandage soft contact lens is used to promote epithelial healing which takes about four days.. LASEK - A microsurgical instrument ...

We identified 33 RCTs conducted in Asia, Europe and United States, totaling 1499 participants (2797 eyes). Participants had refractive errors ranging from high myopia to low hyperopia. Studies reported at least one of the following review-specific outcomes based on proportions of eyes: with uncorrected visual acuity (UCVA) of 20/20 or better, without loss of one or more lines of best spectacle-corrected visual acuity (BSCVA), within ± 0.50 diopters (D) of target refraction, with HOAs and adverse events. Study characteristics and risk of bias Participants were mostly women, mean age 29 and 53 years, and without previous refractive surgery, ocular pathology or systemic comorbidity. We could not judge risks of bias for most domains of most studies. Most studies in which both eyes of a participant were analyzed failed to account for correlations between two eyes in the analysis and reporting of outcomes. Findings For the primary comparison between wavefront (PRK or LASIK or LASEK) and corresponding ...

Photorefractive keratectomy (PRK) is a type of laser eye surgery procedure intended to correct a persons vision, reducing their dependency on glasses or contact lenses. PRK was the first type of laser eye surgery for vision correction and is the predecessor of LASIK. PRK healing times are longer than recovery from LASIK surgery. It may be days or a couple of weeks before your eyesight improves, and even longer for your vision to stabilize. Most PRK patients in Buffalo can usually resume activities such as driving a car one to three weeks after surgery, but it can take three to six months before vision is completely clear and stable.. In PRK, the thin outer layer of the cornea (epithelium) is removed and discarded. Next, Dr. Atwal uses an excimer laser to precisely reshape the curvature of the corneal surface. This computer-controlled, highly specialized excimer laser delivers pulses of cool ultraviolet light that remove microscopic amounts of tissue in a precise pattern. A soft contact lens ...

What is PRK?. PRK (Photorefractive Keratectomy) means removing (shaping) corneal tissue by light (laser) in order to achieve the desired refractive correction. PRK is the first laser vision correction treatment offered to spectacle/contact lens-dependent people. Newer patient-friendly laser techniques such as LASIK and LASEK pushed PRK to third place in the eyes of refractive surgeons.. What are the advantages of PRK?. One of the advantages of the PRK method is that it is an easy surgical procedure. Even a novice eye surgeon can accomplish a PRK operation after watching a few videotapes. But precise programming of the Excimer Laser for the desired vision requires years of experience, since every doctor's surgical method and the environmental factors require construction of special nomograms for specific prescriptions and age. Another advantage of PRK is its being a quick, painless and bloodless laser procedure. PRK consumes lesser corneal tissue than LASIK. PRK or LASEK become the obvious ...

LASIK is perhaps the most common type of laser eye surgery for correcting vision-related problems. Hundreds of thousands of people in the United States have undergone this procedure mainly because of the immediate results of LASIK eye surgery.. Short for Laser in Situ Keratomileusis, LASIK involves the use of a laser to reshape the cornea from underneath a corneal flap. A specialized laser called an excimer laser is used to perform LASIK, as it is designed to address refractive errors like myopia, hyperopia, presbyopia, and astigmatism. It is utilized to improve vision and remove the need for eyeglasses and contact lenses.. How LASIK Works. The first step that an eye surgeon takes during a LASIK surgery is making a thin and very precise incision on the patients corneal flap using a tool called microkeratome. Using an excimer laser, the exposed corneal tissue is then reshaped in prescribed pattern, after which the flap is returned to its natural position onto the cornea.. Types of Lasers. A ...

Excimer laser annealing (ELA) of As-, B- and BF2-implanted Si has been studied by secondary ion mass spectrometry (SIMS), spreading resistance probe (SRP) and transmission electron microscopy (TEM). The implantations have been performed in the energy range from I to 30 keV with doses of 10(15)-10(16) cm(-2). ELA has been carried out with the energy densities in the range of 600-1200 mJ/cm(2) and the number of laser pulses from 1 to 10. It is shown that ELA results in a more uniform dopant distribution over the doped region with a more abrupt profile edge as compared to those after rapid thermal annealing (RTA). Besides, in contrast to RTA, ELA demonstrates a highly confined annealing effect, where the distribution of dopants below the melting region is not affected. SRP measurements demonstrate almost complete activation of the implanted dopants after ELA, and TEM does not reveal extended defects in the ELA-treated samples. The depth of the doped layers, abruptness of the profiles and the total ...

Adikaari, AADT, Mudugamuwa, NK and Silva, SRP (2008) Higher crystalline volume yields from excimer laser crystallization of amorphous silicon with an asymmetrical peak pulse profile In: Symposium on Semiconductor Photonics - Nano-Structured Materials and Devices, 2007-07-01 - 2007-07-06, Singapore, SINGAPORE. Full text not available from this repository ...

Photorefractive Keratectomy or PRK is a type of refractive laser eye surgery used to correct a patients vision to eliminate or reduce their dependence on glasses or contact lenses. PRK is the style of laser eye surgery that preceded LASIK, having been the former most common type of refractive surgery until LASIK came along.. PRK is effective in correcting nearsightedness (myopia), farsightedness (hyperopia) and astigmatism and has very similar rates of success and outcomes as LASIK. PRK remains a common option for laser eye surgery.. How Does PRK Differ From LASIK. PRK and LASIK both permanently reshape the cornea to improve vision by using a laser (an excimer laser to be exact) to remove part of the tissue underneath the corneal epithelium. The epithelium first needs to be removed in order to get access to the tissue and how this is done is what differentiates the two procedures. While LASIK creates and lifts a flap on the outer corneal layer, reshapes the corneal tissue underneath and then ...

Keratomileusis, from Greek κέρας (kéras: horn) and σμίλευσις (smileusis: carving),[1] or corneal reshaping, is the surgical improvement of the refractive state of the cornea by surgically reshaping it. It is the most common form of refractive surgery. The first usable technique was developed by José Ignacio Barraquer, commonly called the father of modern refractive surgery.[citation needed] The most common modern procedure, LASIK, is performed by lifting the front surface of the eye by forming a thin hinged flap under which the shape of the cornea is changed by using an excimer laser or other surgical device. A microkeratome is usually used to cut the flap, but a femtosecond laser can also be used to make the flap. Before the advent of the excimer laser, keratomileusis was performed using a cryolathe, which froze thin flaps of corneal tissue and lathe cut them much like one cuts the lens of a pair of glasses. After thawing, these reshaped flaps were placed under the front flap ...

Refract Corneal Surg. 1993 Nov-Dec;9(6):425-36. Case Reports; Clinical Trial; Multicenter Study; Randomized Controlled Trial; Research Support, Non-U.S. Govt

The clinical trial, conducted at eight sites, included 149 eyes with mixed astigmatism. All patients received iDesign LASIK treatment with the Star S4 IR (Abbott) excimer laser system in tandem with a high-resolution wavefront guided sensor, the iDesign Advanced WaveScan Studio System (Johnson & Johnson Vision Care).. At 3 months postoperative, 91.9% of eyes achieved uncorrected visual acuity (UCVA) of 20/20 or better and demonstrated early refractive stability. Roughly 90% of eyes had 0.50 D or less of residual astigmatism, and 90% had a manifest refraction spherical equivalent within ±0.5 D of emmetropia. These 90-90-90 results were achieved without any enhancement procedures following the complex refractive correction.. The study yielded results comparable to those for excimer laser treatment of myopia and myopic astigmatism, the most common and successful LASIK correction. Subjective data collected in the study showed that, in addition to attaining good refractive results, patients were ...