Angioplasty, Balloon, Laser-Assisted
Keratomileusis, Laser In Situ
Laser Therapy, Low-Level
Refractive Surgical Procedures
Corneal Surgery, Laser
Laser Scanning Cytometry
Fiber Optic Technology
Descemet Stripping Endothelial Keratoplasty
Laser Capture Microdissection
Microscopy, Electron, Scanning
Extravasation of Diagnostic and Therapeutic Materials
Angioplasty, Balloon, Coronary
Chemistry Techniques, Analytical
Molecular Probe Techniques
Human corneal ablation threshold using the 193-nm ArF excimer laser. (1/239)PURPOSE: To determine the human corneal threshold ablation energy density for the 193-nm ArF excimer laser, approximating clinical conditions. METHODS: The VISX Star (Santa Clara, CA) 193-nm argon fluoride excimer laser was used to ablate the cornea in human eye bank eyes under clinical conditions. Corneas were exposed to energy densities of 10, 20, 30, 35, 40, 45, and 140 to 160 mJ/cm2. Corneas were fixed for light and transmission electron microscopy immediately after laser exposure. RESULTS: Different ablation thresholds for various corneal structural elements were observed. The ablation threshold for the collagen in the corneal stroma was determined to be 30 mJ/cm2. Keratocytes had ablation thresholds of 40 mJ/cm2. These different ablation thresholds accounted for the production of stromal peaks and valleys, with the keratocytes atop the peaks. CONCLUSIONS: Different corneal structural elements have different ablation threshold energy densities. (+info)
Excimer laser ophthalmic surgery: evaluation of a new technology. (2/239)The aim of this article is to provide information and an overview of the potential risks and benefits of excimer laser surgery, a new and promising technique in ophthalmic surgery. Although this review concentrates on the use of the laser for refractive purposes, novel therapeutic techniques are also discussed. It is hoped that this will enable general practitioners, optometrists and physicians to provide appropriate advice and counselling for patients. (+info)
Analysis of glycosaminoglycans in rabbit cornea after excimer laser keratectomy. (3/239)BACKGROUND/AIMS: The biochemical basis for the development of subepithelial opacity of the cornea after excimer laser keratectomy has yet to be fully defined. The aim of this study was to evaluate the alterations of glycosaminoglycans (GAGs) after excimer laser keratectomy. METHODS: Rabbit corneas were harvested on days 5, 10, 20, and 30 after excimer laser photoablation. The amount of main disaccharide units was determined by high performance liquid chromatography (HPLC). In addition, immunohistochemical studies were performed on corneal sections 20 days after the ablation. RESULTS: The concentrations of DeltaDi-0S at 5 and 10 days were significantly lower than before the ablation. DeltaDi-6S showed a significant increase 5 days after the ablation but DeltaDi-4S did not show any significant change. There was a significant increase in DeltaDi-HA at 20 and 30 days after ablation. In immunohistochemistry, the positive staining for DeltaDi-6S and hyaluronic acid was observed in the subepithelial region. These immunohistochemical results were well correlated with the HPLC findings. CONCLUSIONS: The increase in chondroitin-6 sulphate and hyaluronic acid may be related to corneal subepithelial opacity after excimer laser keratectomy. (+info)
Recent advances in refractive surgery. (4/239)Refractive errors are some of the most common ophthalmic abnormalities world-wide and are associated with significant morbidity. Tremendous advances in treating refractive errors have occurred over the past 20 years. The arrival of the excimer laser has allowed a level of accuracy in modifying the cornea that was unattainable before. Although refractive surgery is generally safe and effective, it does carry some risks. Careful patient selection, meticulous surgical technique and frequent follow-up can avoid most complications. The experience of a surgical team can also affect the outcome and the incidence of complications. The future should bring continued improvement in outcomes, fewer complications and exciting new options for treating refractive errors. (+info)
Spherical and aspherical photorefractive keratectomy and laser in-situ keratomileusis for moderate to high myopia: two prospective, randomized clinical trials. Summit technology PRK-LASIK study group. (5/239)OBJECTIVE: Determine the outcomes of single-zone photorefractive keratectomy (SZPRK), aspherical photorefractive keratectomy (ASPRK), and laser in-situ keratomileusis (LASIK) for the correction of myopia between -6 and -12 diopters. DESIGN: Two simultaneous prospective, randomized, multi-center clinical trials. PARTICIPANTS: 286 first-treated eyes of 286 patients enrolled in one of two studies. In Study I, 134 eyes were randomized to SZPRK (58 eyes) or ASPRK (76 eyes). In Study II, 152 eyes were randomized to ASPRK (76 eyes) or to LASIK (76 eyes). INTERVENTION: All eyes received spherical one-pass excimer laser ablation as part of PRK or LASIK performed with the Summit Technologies Apex laser under an investigational device exemption, with attempted corrections between -6 and -12 diopters. MAIN OUTCOME MEASURES: Data on uncorrected and best spectacle-corrected visual acuity, predictability and stability of refraction, and complications were analyzed. Follow-up was 12 months. RESULTS: At 1 month postoperatively, more eyes in the LASIK group achieved 20/20 and 20/25 or better uncorrected visual acuity than PRK-treated eyes; at the 20/25 or better level, the difference was significant for LASIK (29/76 eyes, 38%) over SZPRK (10/58 eyes, 17%) (P = .0064). At all subsequent postoperative intervals, no difference was seen between treatment groups. Similarly, best corrected visual acuities were better for LASIK than all PRK eyes at 1 month postoperatively, and LASIK was better than SZPRK at 3 months follow-up (e.g., for 20/20 or better at 1 month, LASIK 50/76 eyes (66%) versus SZPRK 24/57 eyes (42%), P = .0066). PRK eyes had a mean loss of BCVA through 6 months, while LASIK eyes had a slight gain of mean BCVA through month 6; at 12 months, both ASPRK groups but not SZPRK continued to have a small mean loss of BCVA (e.g., compared to preoperative, mean BCVA at 12 months for SZPRK was + 0.3, LASIK was +.21, ASPRK I was -0.11, and ASPRK II -0.31 (SZPRK versus ASPRK II, P = .0116). Predictability was better for PRK than LASIK at all follow-up intervals (e.g., for manifest refraction spherical equivalent +/- 1.0 diopters at 6 months, ASPRK I 42/62 eyes (68%) versus LASIK 29/72 eyes (40%), P = .0014%). Stability was slightly but insignificantly less in the LASIK eyes compared to PRK eyes. All visual outcome measures were better for eyes with preoperative myopia between -6 and -8.9 D compared with eyes with myopia between -9 and -12 D. No consistent differences in refractive outcomes or postoperative corneal haze were seen between aspherical and single-zone ablations; haze diminished over 12 months and was judged to be vision-impairing in only one ASPRK eye. Microkeratome and flap complications occurred in 4 eyes, resulting in delay of completion of the procedure in 3 eyes but not causing long-term impairment. CONCLUSIONS: Improvement in uncorrected visual acuity and return of best corrected visual acuity was more rapid for LASIK than PRK, but efficacy outcomes in the longer term through 12 months were similar for all treatment groups. LASIK eyes tended toward undercorrection with the nomogram employed in this study compared to PRK, but the scatter was similar, suggesting little difference between these procedures for most patients by 6 months and thereafter. No consistent advantage was demonstrated between aspherical and single-zone ablation patterns. Predictability was much better for all procedures for corrections of -6 to -8.9 D compared with -9 to -12 D. Sporadic loss of best corrected vision in the PRK eyes not found in the LASIK eyes and other measures of visual function require further study. (+info)
Enhancement ablation for the treatment of undercorrection after excimer laser in situ keratomileusis for correcting myopia. (6/239)OBJECTIVE: To evaluate the treatment of undercorrection after the excimer laser in situ keratomileusis (LASIK) for correcting moderate and high myopia. METHODS: An enhancement ablation was performed in 48 eyes of 39 patients who had undergone LASIK but remained in undercorrection. Four procedures were performed within 1 month postoperatively, and the others performed between 3 and 10 months. The surgical technique includes the re-invert of the corneal cap from the temporal side, the excimer laser ablation, and the re-position of the cap. RESULTS: The undercorrection (spherical equivalent) ranged from -2.00 to -11.00 D, with a mean of -4.34D +/- 1.95 D. Following up after enhancement ablation was done after 4 to 12 months, the refractions in the 42 eyes were found to be within +/- 1.00 D. Undercorrection of -2.50 D to -5.00 D recurred in 6 eyes. Uncorrected visual acuity equals to the preoperative spectacle corrected visual acuity in 39 of 48 eyes (81.3%). Five eyes gained 1 line, 1 eye gained 2 lines and 4 eyes lost 1 line. No eyes had haze. CONCLUSION: Undercorrection after LASIK can be corrected by an enhancement ablation of the stroma under the primary corneal cap with a 193 nm ArF excimer laser, and the time for the enhancement of ablation is at 3 months postoperatively. (+info)
Excimer laser effects on outflow facility and outflow pathway morphology. (7/239)PURPOSE: To determine the relative contributions to aqueous outflow resistance of the tissues distal to the inner wall of Schlemm's canal. METHODS: While performing constant pressure perfusion at 10 mm Hg, a 193-nm excimer laser (Questek) was used to precisely remove portions of sclera, unroofing Schlemm's canal while leaving the inner wall intact. The laser beam was masked to produce a beam 2 mm by 1 mm. The laser output was constant at a fluency of 75 mJ/cm2 and 20 Hz. The excimer laser at a frequency of 1 Hz was used as the aiming beam. Photoablation was performed on human cadaver eyes at the limbus at an angle of 0 degrees to 45 degrees from the optical axis. As the excimer photoablations progressed, Schlemm's canal was visualized by the fluorescence of the Barany's solution containing fluorescein dye. After perfusion fixation the eyes were immersion-fixed overnight. The facility of outflow before (Co) and after (Ce) the excimer ablation was measured in 7 eyes. RESULTS: The facility of outflow increased in all eyes after the excimer sinusotomy, from a mean of 0.29+/-0.02 before the sinusotomy to 0.37+/-0.03 microl/min per mm Hg after (P < 0.05). The mean ratio of outflow facility after and before ablation (Ce/Co) was 1.27+/-0.08 (range, 1.20-1.39), a reduction of outflow resistance of 21.3%. Using the formula of Ellingsen and Grant (1972), percentage of resistance to outflow eliminated = 100 [1 - alphaCo/Ce - (1 - alpha)Co], where alpha = fraction of the circumference dissected. Assuming that because of circumferential flow approximately 50% of Schlemm's canal is drained by the single opening made in the outer wall ablation studies, this results in resistance to outflow eliminated of 35%, which is consistent with the calculated eliminated resistance derived from the data of Rosenquist et al., 1989. Light and scanning electron microscopy confirmed the integrity of the inner wall Schlemm's canal underlying the area of ablation. CONCLUSIONS: The results provide direct evidence indicating that approximately one third of resistance to outflow in the human eye lies distal to the inner wall Schlemm's canal in an enucleated perfused human eye. (+info)
Analysis of the factors affecting decentration in photorefractive keratectomy and laser in situ keratomileusis for myopia. (8/239)To evaluate the relationship between ablation zone decentration measured by corneal topography and various factors such as sex, age, order of operation, preoperative sedative prescription, ablation diameter and depth, type of procedure (photorefractive keratectomy = PRK, laser in situ keratomileusis = LASIK), and the use of a passive eye tracker, we examined the data of 80 eyes in 50 patients. The patients received PRK (43 eyes in 30 patients) or LASIK (37 eyes in 20 patients), and were followed for 3 months postoperatively. Statistical analysis of the data was performed using t-test, ANOVA and multiple regression analysis. The overall average ablation decentration from the pupil center was 0.43 +/- 0.27 mm, 0.35 +/- 0.22 mm in PRK and 0.47 +/- 0.30 mm in LASIK. Overall 91.3% of patients were decentered less than 0.75 mm and 95.0% were decentered less than 1.00 mm, while 93.9% of patients were decentered less than 0.75 mm in PRK and 88.7% were decentered less than 0.75 mm in LASIK. The most meridional displacement was toward the superonasal quadrant; 46% in PRK and 51% in LASIK. There was less decentration in males, in the 2nd-operated eye, in older age, PRK, in larger ablation diameter, and in shallower ablation depth, but these differences were not statistically significant. (+info)
Myopia can be caused by a variety of factors, including:
1. Genetics: Myopia can run in families, and people with a family history of myopia are more likely to develop the condition.
2. Near work: Spending too much time doing close-up activities such as reading or using digital devices can increase the risk of developing myopia.
3. Poor posture: Slouching or leaning forward can cause the eye to focus incorrectly, leading to myopia.
4. Nutritional deficiencies: A diet lacking in essential nutrients such as vitamin D and omega-3 fatty acids may contribute to the development of myopia.
5. Eye stress: Prolonged eye strain due to excessive near work or other activities can lead to myopia.
Symptoms of myopia include:
1. Difficulty seeing distant objects clearly
2. Headaches or eye strain from trying to focus on distant objects
3. Squinting or rubbing the eyes to try to see distant objects more clearly
4. Difficulty seeing in low light conditions
5. Blurry vision at a distance, with close objects appearing clear.
Myopia can be diagnosed with a comprehensive eye exam, which includes a visual acuity test, refraction test, and retinoscopy. Treatment options for myopia include:
1. Glasses or contact lenses: These corrective lenses refract light properly onto the retina, allowing clear vision of both close and distant objects.
2. Laser eye surgery: Procedures such as LASIK can reshape the cornea to improve its curvature and reduce myopia.
3. Orthokeratology (ORTHO-K): A non-surgical procedure that uses a specialized contact lens to reshape the cornea while you sleep.
4. Myopia control: This involves using certain treatments or techniques to slow down the progression of myopia in children and young adults.
5. Multifocal lenses: These lenses have multiple focal points, allowing for clear vision of both near and distant objects without the need for glasses or contact lenses.
In conclusion, myopia is a common vision condition that can be caused by a variety of factors and symptoms can include difficulty seeing distant objects clearly, headaches, and eye strain. Treatment options include glasses or contact lenses, laser eye surgery, ORTHO-K, myopia control, and multifocal lenses. It is important to consult an eye doctor for a comprehensive evaluation and to determine the best course of treatment for your specific case of myopia.
1. Keratoconus: This is a progressive thinning of the cornea that can cause it to bulge into a cone-like shape, leading to blurred vision and sensitivity to light.
2. Fuchs' dystrophy: This is a condition in which the cells in the innermost layer of the cornea become damaged, leading to clouding and blurred vision.
3. Bullous keratopathy: This is a condition in which there is a large, fluid-filled bubble on the surface of the cornea, which can cause blurred vision and discomfort.
4. Corneal ulcers: These are open sores on the surface of the cornea that can be caused by infection or other conditions.
5. Dry eye syndrome: This is a condition in which the eyes do not produce enough tears, leading to dryness, irritation, and blurred vision.
6. Corneal abrasions: These are scratches on the surface of the cornea that can be caused by injury or other conditions.
7. Trachoma: This is an infectious eye disease that can cause scarring and blindness if left untreated.
8. Ocular herpes: This is a viral infection that can cause blisters on the surface of the cornea and lead to scarring and vision loss if left untreated.
9. Endophthalmitis: This is an inflammation of the inner layer of the eye that can be caused by bacterial or fungal infections, and can lead to severe vision loss if left untreated.
10. Corneal neovascularization: This is the growth of new blood vessels into the cornea, which can be a complication of other conditions such as dry eye syndrome or ocular trauma.
These are just a few examples of the many different types of corneal diseases that can affect the eyes. It's important to seek medical attention if you experience any symptoms such as pain, redness, or blurred vision in one or both eyes. Early diagnosis and treatment can help prevent complications and preserve vision.
Astigmatism can occur in people of all ages and is usually present at birth, but it may not become noticeable until later in life. It may also develop as a result of an injury or surgery. Astigmatism can be corrected with glasses, contact lenses, or refractive surgery, such as LASIK.
There are different types of astigmatism, including:
1. Corneal astigmatism: This is the most common type of astigmatism and occurs when the cornea is irregularly shaped.
2. Lens astigmatism: This type of astigmatism occurs when the lens inside the eye is irregularly shaped.
3. Mixed astigmatism: This type of astigmatism occurs when both the cornea and lens are irregularly shaped.
Astigmatism can cause a range of symptoms, including:
* Blurred vision at all distances
* Distorted vision (such as seeing objects as being stretched out or blurry)
* Eye strain or fatigue
* Headaches or eye discomfort
* Squinting or tilting the head to see clearly
If you suspect you have astigmatism, it's important to see an eye doctor for a comprehensive eye exam. Astigmatism can be diagnosed with a visual acuity test and a retinoscopy, which measures the way the light enters the eye.
Astigmatism is a common vision condition that can be easily corrected with glasses, contact lenses, or refractive surgery. If you have astigmatism, it's important to seek professional treatment to improve your vision and reduce any discomfort or strain on the eyes.
The exact cause of vitiligo is still unknown, but it is believed to involve a combination of genetic and environmental factors. In people with vitiligo, the immune system mistakenly attacks and destroys melanocytes, leading to a loss of skin pigmentation. The disease can also be triggered by physical or emotional stress, sun exposure, and certain medications.
The symptoms of vitiligo can vary in severity and progression. They may include:
1. White patches on the skin, which can appear suddenly or gradually over time.
2. Loss of skin pigmentation in specific areas, such as the face, hands, or limbs.
3. Thinning or loss of hair on affected areas.
4. Premature whitening or graying of the hair.
5. Itching, pain, or sensitivity in the affected areas.
6. Emotional distress and reduced quality of life due to the visible appearance of the disease.
There is no cure for vitiligo, but various treatments can help manage the symptoms and slow down its progression. These may include:
1. Topical corticosteroids to reduce inflammation and suppress the immune system.
2. Topical immunomodulators to suppress the immune system and promote skin repigmentation.
3. Narrowband ultraviolet B (UVB) phototherapy to slow down the progression of the disease and improve skin appearance.
4. Psoralen photochemotherapy to promote skin repigmentation and reduce inflammation.
5. Surgical skin grafting or blister grafting to cover small areas of depigmentation.
6. Camouflage makeup to cover the affected areas and improve self-esteem.
In addition to these treatments, it is essential for patients with vitiligo to protect their skin from the sun by using broad-spectrum sunscreens, wearing protective clothing, and seeking shade when the sun is strongest.
Early diagnosis and appropriate treatment can help improve the quality of life for patients with vitiligo. However, the emotional and psychological impact of the disease should not be underestimated, and patients may require long-term support and counseling to cope with the challenges of living with this condition.
Hyperopia, also known as farsightedness, is a common vision condition in which close objects appear blurry while distant objects appear clear. This occurs when the eyeball is shorter than normal or the cornea is not curved enough, causing light rays to focus behind the retina rather than directly on it. Hyperopia can be treated with glasses, contact lenses, or refractive surgery.
Word origin: Greek "hyper" (beyond) + "ops" (eye) + -ia (suffix denoting a condition or state)
First recorded use: 1690s
The term extravasation is commonly used in medical contexts to describe the leakage of fluids or medications from a blood vessel or other body structure. In the context of diagnostic and therapeutic materials, extravasation can refer to the leakage of materials such as contrast agents, medications, or other substances used for diagnostic or therapeutic purposes.
Extravagation of diagnostic and therapeutic materials can have significant consequences, including tissue damage, infection, and systemic toxicity. For example, if a contrast agent used for imaging purposes leaks into the surrounding tissues, it can cause inflammation or other adverse reactions. Similarly, if a medication intended for injection into a specific location leaks into the surrounding tissues or organs, it can cause unintended side effects or toxicity.
To prevent extravasation of diagnostic and therapeutic materials, healthcare providers must follow proper techniques and protocols for administration and use of these materials. This may include using sterile equipment, following proper injection techniques, and monitoring the patient closely for any signs of complications. In cases where extravasation does occur, prompt treatment and management are essential to minimize potential harm and prevent long-term consequences.
Recurrence can also refer to the re-emergence of symptoms in a previously treated condition, such as a chronic pain condition that returns after a period of remission.
In medical research, recurrence is often studied to understand the underlying causes of disease progression and to develop new treatments and interventions to prevent or delay its return.
Coronary disease is often caused by a combination of genetic and lifestyle factors, such as high blood pressure, high cholesterol levels, smoking, obesity, and a lack of physical activity. It can also be triggered by other medical conditions, such as diabetes and kidney disease.
The symptoms of coronary disease can vary depending on the severity of the condition, but may include:
* Chest pain or discomfort (angina)
* Shortness of breath
* Swelling of the legs and feet
* Pain in the arms and back
Coronary disease is typically diagnosed through a combination of physical examination, medical history, and diagnostic tests such as electrocardiograms (ECGs), stress tests, and cardiac imaging. Treatment for coronary disease may include lifestyle changes, medications to control symptoms, and surgical procedures such as angioplasty or bypass surgery to improve blood flow to the heart.
Preventative measures for coronary disease include:
* Maintaining a healthy diet and exercise routine
* Quitting smoking and limiting alcohol consumption
* Managing high blood pressure, high cholesterol levels, and other underlying medical conditions
* Reducing stress through relaxation techniques or therapy.
1. Infection: Bacterial or viral infections can develop after surgery, potentially leading to sepsis or organ failure.
2. Adhesions: Scar tissue can form during the healing process, which can cause bowel obstruction, chronic pain, or other complications.
3. Wound complications: Incisional hernias, wound dehiscence (separation of the wound edges), and wound infections can occur.
4. Respiratory problems: Pneumonia, respiratory failure, and atelectasis (collapsed lung) can develop after surgery, particularly in older adults or those with pre-existing respiratory conditions.
5. Cardiovascular complications: Myocardial infarction (heart attack), cardiac arrhythmias, and cardiac failure can occur after surgery, especially in high-risk patients.
6. Renal (kidney) problems: Acute kidney injury or chronic kidney disease can develop postoperatively, particularly in patients with pre-existing renal impairment.
7. Neurological complications: Stroke, seizures, and neuropraxia (nerve damage) can occur after surgery, especially in patients with pre-existing neurological conditions.
8. Pulmonary embolism: Blood clots can form in the legs or lungs after surgery, potentially causing pulmonary embolism.
9. Anesthesia-related complications: Respiratory and cardiac complications can occur during anesthesia, including respiratory and cardiac arrest.
10. delayed healing: Wound healing may be delayed or impaired after surgery, particularly in patients with pre-existing medical conditions.
It is important for patients to be aware of these potential complications and to discuss any concerns with their surgeon and healthcare team before undergoing surgery.
Excimer laser trabeculostomy
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Mani Lal Bhaumik
Herbert E. Kaufman
Hydroxyl tagging velocimetry
Extreme ultraviolet lithography
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William M. Jackson (chemist)
Noble gas compound
Molecular laser isotope separation
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Samuel E. Blum
Clifford Paterson Lecture
Holographic data storage
Traian V. Chirilă
Susan D. Allen
Johnson & Johnson Vision
Boron nitride nanotube
Blunt atrial transseptal puncture using excimer laser in swine - PubMed
San Jose LASIK and Excimer Laser technology
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- In this case, an argon fluoride excimer laser was employed as a source of ablation. (utm.my)
- Multifocality achieved by excimer ablation sometimes known as presbyLasik, is interesting to refractive surgeons because it is familiar, seems less invasive than intraocular surgery and could theoretically be more controllable. (bmj.com)
- To further understand their roles, mRNA levels were measured and proteins were immunolocalized in rat corneas at multiple time points during healing of excimer laser ablation injury. (unthsc.edu)
- The mechanism of ablation of the excimer laser appears to be photochemical in nature and is known as photochemical ablation or ablative photodecomposition. (medscape.com)
- Using increased skin protect ive measures, developing and making available protect ive clothing with a tighter weave (to screen out UV radiation) and having higher ablation thresholds, and designing eyewear that can withstand potential excimer laser radiation etching effects are also recommended. (cdc.gov)
- Fully protect ing the face is important because during ablation, excimer lasers can eject potentially hazardous or toxic materials considerable distances from the original site. (cdc.gov)
- 1. Light source:308nm XeCl excimer light source 2. (kernelmedint.com)
- The technique of laser in situ keratomileusis (LASIK) has been used with very encouraging results in the treatment of all degrees of myopia and also shows considerable promise in the treatment of hyperopia. (nih.gov)
- Corneal subbasal nerve density does not recover to near preoperative densities until 2 years after PRK, as compared to 5 years after laser in situ keratomileusis (LASIK). (medscape.com)
- Laser-assisted in situ keratomileusis (LASIK) eye surgery is increasingly common, with approximately 600,000 procedures performed each year in the United States ( 1 ). (cdc.gov)
- 8. Comparison of photorefractive keratectomy, astigmatic PRK, laser in situ keratomileusis, and astigmatic LASIK in the treatment of myopia. (nih.gov)
- Pogodina E.G., Mushkova I.A., Karimova A.N., Movshev V.G. Nomogram for aspherical operations for myopia correction using «Microscan-VIZUM» excimer laser. (pmarchive.ru)
- McDonald performed the first excimer PRK for the correction of myopia on a normally sighted human eye in the United States. (medscape.com)
- A study comparing transepithelial PRK and laser surgery found that both offer effective correction of myopia at 1 year, but LASIK seemed to result in less discomfort and less intense wound healing in the early postoperative period. (medscape.com)
- 10. [Excimer laser photorefractive keratectomy in myopia and astigmatism--1 year experience]. (nih.gov)
- 11. Prospective study of photorefractive keratectomy for myopia using the VISX StarS2 excimer laser system. (nih.gov)
- 14. Excimer laser surgery for myopia and myopic astigmatism. (nih.gov)
- 18. Excimer laser refractive surgery versus phakic intraocular lenses for the correction of moderate to high myopia. (nih.gov)
- 19. [Analysis of refractive state after excimer laser photorefractive keratectomy in myopia]. (nih.gov)
- Excimer lasers use a combination of argon (an inert gas) and fluorine (a highly reactive gas). (turnereye.com)
- Photorefractive keratectomy (PRK) consists of the application of energy of the ultraviolet range generated by an argon fluoride (ArF) excimer laser to the anterior corneal stroma to change its curvature and, thus, to correct a refractive error. (medscape.com)
- During the 1980s, several applications of the 193-nm ArF excimer laser were investigated, including its use on human corneas for the correction of refractive errors. (medscape.com)
- A newer type of laser refractive surgery called SMILE (Small Incision Lenticule Extraction) is also approved for use in the United States. (medlineplus.gov)
- 3. Wavefront excimer laser refractive surgery for adults with refractive errors. (nih.gov)
- 5. Comparison of objective methods for quantifying the refractive effect of photo-astigmatic refractive keratectomy using the MEL-60 excimer laser. (nih.gov)
- 20. Selective zonal ablations with excimer laser for correction of irregular astigmatism induced by refractive surgery. (nih.gov)
- 13. Natural history of central topographic islands following excimer laser photorefractive keratectomy. (nih.gov)
- Rather than burning, heating, or cutting the tissue, the excimer laser adds enough energy at one time to disrupt the molecular bonds of the surface molecules, which effectively evaporate into the air in a reaction that is known as photoablation. (turnereye.com)
- Methods: Excimer laser photoablation was performed to a depth of 50 μm on rat corneas. (unthsc.edu)
- Perhaps the most important technology in the ability to perform LASIK eye surgery in San Jose was the invention of the excimer laser. (turnereye.com)
- No other medical device used in LASIK surgery is as advanced or has as much influence upon the results of LASIK eye surgery as the excimer laser. (turnereye.com)
- A San Jose LASIK surgeon should consider the Excimer Laser to be the single most important piece of equipment that is used in LASIK eye surgery. (turnereye.com)
- While there have been a few laser companies that have experimented with solid state lasers, the majority of lasers used today for LASIK surgery and all of the FDA approved lasers operate at a wavelength of 193 nanometers and are therefore ultraviolet lasers. (turnereye.com)
- The excimer laser is an ultraviolet chemical laser and has been very effective in LASIK eye surgery. (turnereye.com)
- Excimer lasers have grown progressively faster with time, allowing the total LASIK treatment time to be reduced. (turnereye.com)
- It is important to reduce the laser time during LASIK in order to reduce the time in which the flap is open and can result in surface dryness. (turnereye.com)
- LASIK eye surgery is typically performed in an outpatient setting and involves the use of a machine-guided laser to reshape the lens of the eye to correct vision irregularities ( 2 ). (cdc.gov)
- Although TLCHD staff reported that they did not observe obvious lapses in medication preparation or hand hygiene, they did note that clinic A used two humidifiers to maintain the 40%-50% relative humidity recommended by the manufacturer of the laser device used in the LASIK procedures ( 3 ). (cdc.gov)
- Because of the high level of humidity recommended by the manufacturers of the lasers used in LASIK procedures, it is possible that additional LASIK clinics employ similar humidifier systems. (cdc.gov)
Managed to manufacture1
- Many of the laser manufacturers (such as Zeiss, Alegretto, and Alcon) have managed to manufacture lasers operating at speed of over 200 Hz. (turnereye.com)
- Unlike other forms of laser therapy used for cosmetic procedures, it does not penetrate deeply into the skin. (ocskininstitute.com)
- When performed by a board-certified dermatologist, Pharos Excimer Laser therapy is fast, simple, and should have no major side effects. (ocskininstitute.com)
- Objective: This study was conducted to evaluate the effects of excimer laser therapy on vitiligo of the head and neck area against various clinical parameters. (elsevierpure.com)
- Conclusion: Excimer laser therapy is an effective and safe therapy for vitiligo of the face and neck area. (elsevierpure.com)
- Promising results from excimer laser therapy can be expected in patients who have a short duration of evolution of the vitiligo below 1 year, a focal or generalized type of vitiligo, no previous history of treatment, and a vitiliginous lesion without poliosis. (elsevierpure.com)
- [ 35 ] The combination of UV-B 308-nm excimer light and bath PUVA therapy may be effective in the treatment of prurigo nodularis. (medscape.com)
- Another condition treated by the Pharos Excimer Laser is vitiligo. (ocskininstitute.com)
- While Pharos Excimer Laser treatment is not a cure for psoriasis or vitiligo, it can provide several months of clear, symptom-free skin once treatment is completed. (ocskininstitute.com)
- Comparison of 311-nm Titanium:Sapphire laser and 308-nm excimer laser treatment for vitiligo: A randomized controlled non-inferiority trial. (bvsalud.org)
- Background: The excimer laser has recently been introduced as a new therapeutic modality for vitiligo. (elsevierpure.com)
- However, to date, there have only been a few clinical reports evaluating the therapeutic effects of excimer laser treatment for vitiligo of the head and neck area. (elsevierpure.com)
- Studies have reported success rates ranging from 80-98% 1-5 for monovision post laser vision correction (LVC), 91% for monovision after cataract surgery and 95% following clear lens extraction 6 with good satisfaction. (bmj.com)
- Rarely, complications of laser vision correction may occur. (medlineplus.gov)
- 15. [Excimer laser photorefactive keratectomy retreatment following photokeratectomy under-correction]. (nih.gov)
- One HRBF method, fast photochemical oxidation of proteins (FPOP), utilizes an excimer laser for photolysis of hydrogen peroxide to generate hydroxyl radicals. (nih.gov)
- The Pharos Excimer Laser is useful in treating psoriasis , which causes outbreaks of itchy, scaly skin to appear at various places on the body. (ocskininstitute.com)
- Garching - SUSS MicroTec, a global supplier of equipment and process solutions for the semiconductor industry and related markets, has successfully installed an ELP300 excimer laser stepper to support next generation advanced packaging and 3D IC laser debonding applications at the Fraunhofer Institute for Reliability and Microintegration (IZM), Berlin. (thomasnet.com)
- Resistant nodules have been successfully treated with excimer lasers as well. (medscape.com)
- The general characteristics and uses of excimer lasers were summarized. (cdc.gov)
- Methods: The 87 patients enrolled in this study were treated with excimer laser monotherapy. (elsevierpure.com)
- Palmaz Scientific fabricates intricate implantable stents with Spectra-Physics' femtosecond laser and ILT system Santa Clara, CA - Palmaz Scientific, Spectra-Physics-® and Innovative Laser Technologies (ILT) announce the demonstration of femtosecond laser micromachining of next-generation implantable medical devices. (thomasnet.com)
- With Spectra-Physics' femtosecond lasers and ILT's precision machining. (thomasnet.com)
- The laser light is also considered to be absorbed well and therefore has very little effect on the surrounding tissue. (turnereye.com)
- At 248 nm, near the resonance of the plasmon, we expect the interaction of laser light and carbon nanotube material to exhibit relatively high absorptivity. (nist.gov)
- This highly localized tissue interaction is based on the fact that each photon produced by the ArF excimer laser has 6.4 eV of energy, enough to break covalent bonds. (medscape.com)
- These lasers are operated in pulsed and Q-switched modes and used in photoablative decomposition involving actual removal of tissue. (nih.gov)
- Many of the Excimer Lasers that are being manufactured are attempting to shorten treatment time without causing excess heating. (turnereye.com)
- Pharos Excimer Laser treatment can be prescribed by any board-certified dermatologist, and is usually covered by insurance. (ocskininstitute.com)
- What Does Pharos Excimer Laser Treatment Involve? (ocskininstitute.com)
- One treatment session usually requires only 10 to 20 minutes of laser application. (ocskininstitute.com)
- 308 Excimer Targeted Phototherapy system is a new kind of phototherapy treatment instrument, it can erupt high energy ultraviolet rays. (uvbshop.com)
- Phototherapy treatment has limited studies showing potential benefits and efficacy but psoralen plus ultraviolet (UV)-A (PUVA), broadband UV-B, narrowband UV-B, excimer laser, and UV-A have been used with success, with no evidence that any modality is superior to the other. (medscape.com)
- The mean procedure time was 15 +/- 6 min, with an average 3.0 +/- 0.8 sec of laser activation. (nih.gov)
- Biologics can be expensive and carry a risk of side effects, including organ damage and birth defects while phototherapy requires that healthy skin be exposed to ultraviolet radiation, creating a risk of skin cancer that isn't present with the more targeted cosmetic procedure of the Pharos Excimer Laser. (ocskininstitute.com)
- Since then, Nidek also has obtained approval for the manufacture of excimer lasers in the United States, and several hundred thousand patients have undergone this procedure throughout the world. (medscape.com)
- Process utilizes TRUMPF TruLaser 5030 Fiber unit - 3-axis, solid-state fiber laser system - that accommodates. (thomasnet.com)
- Tube Laser System accepts raw tubes to 24 ft. (thomasnet.com)
- Laser Tube Cutting System handles small to medium-sized tubes. (thomasnet.com)
- We have designed and built a single cell flow system to enable uniform access of cells to the laser. (nih.gov)
- A large area cold cathode diode X-ray source and its performances and dosage distribution along with the laser tube and the effects of X-ray intensity on the laser output energy were investigated experimentally. (harvard.edu)
- Biological effects and safety issues associated with using excimer lasers were discussed. (cdc.gov)
- The results of studies examining the biological effects of excimer laser radiation on skin and other biological material were summarized. (cdc.gov)
- Excimer lasers have opened the way for corrective eye surgery in a way that at one time may have been considered impossible. (turnereye.com)
- In truth, the term excimer laser could be considered a misnomer since the majority of â€œexcimerâ€ lasers are created using the noble gas halides. (turnereye.com)
- The term excimer uses the words â€œexcited dimerâ€ which refers to a molecule of two identical or similar parts. (turnereye.com)
- The correct term should in fact be the exciplex laser. (turnereye.com)
- Obviously firing a laser in areas of close proximity in rapid succession could lead to excess heating and less desirable results. (turnereye.com)
- In comparison to phosphorus (P) doping performed using phosphoric acid solution, the laser N doping can introduce N atoms deeper (∼1 μm depth) into the 4H-SiC, which results in reduction of doped layer resistance by approximately 3 orders of magnitude. (elsevier.com)
- Compared to CO2 laser, fiber laser offers optimized energy efficiency while eliminating routine maintenance and optical beam alignments. (thomasnet.com)
- Click here to learn about other laser procedures our office offers. (ocskininstitute.com)
- The word excimer is short for â€˜excited dimerâ€™, referring to the state of stimulation that is created prior to the laser being fired. (turnereye.com)
- The first excimer lasers used to perform PRK in the late 1980s have been improved significantly in terms of size, efficiency, and accuracy. (medscape.com)
- The QCM is a means to quantify laser damage with respect to irradiance, pulse width and exposure time. (nist.gov)
- Turin, Italy: The latest development from Prima Power Laserdyne LLC, the multi axis LASERDYNE 430BD, opens new aerospace design and manufacturing possibilities for laser cutting, drilling and welding at Avio S.p.A. Avio S.p.A. is at the forefront of developing advanced manufacturing technology as it expands its laser manufacturing capabilities. (thomasnet.com)