Measurement of the thickness of the CORNEA.
The measurement of curvature and shape of the anterior surface of the cornea using techniques such as keratometry, keratoscopy, photokeratoscopy, profile photography, computer-assisted image processing and videokeratography. This measurement is often applied in the fitting of contact lenses and in diagnosing corneal diseases or corneal changes including keratoconus, which occur after keratotomy and keratoplasty.
The transparent anterior portion of the fibrous coat of the eye consisting of five layers: stratified squamous CORNEAL EPITHELIUM; BOWMAN MEMBRANE; CORNEAL STROMA; DESCEMET MEMBRANE; and mesenchymal CORNEAL ENDOTHELIUM. It serves as the first refracting medium of the eye. It is structurally continuous with the SCLERA, avascular, receiving its nourishment by permeation through spaces between the lamellae, and is innervated by the ophthalmic division of the TRIGEMINAL NERVE via the ciliary nerves and those of the surrounding conjunctiva which together form plexuses. (Cline et al., Dictionary of Visual Science, 4th ed)
Methods and procedures for the diagnosis of diseases of the eye or of vision disorders.
A surgical procedure to correct MYOPIA by CORNEAL STROMA subtraction. It involves the use of a microkeratome to make a lamellar dissection of the CORNEA creating a flap with intact CORNEAL EPITHELIUM. After the flap is lifted, the underlying midstroma is reshaped with an EXCIMER LASER and the flap is returned to its original position.
A noninflammatory, usually bilateral protrusion of the cornea, the apex being displaced downward and nasally. It occurs most commonly in females at about puberty. The cause is unknown but hereditary factors may play a role. The -conus refers to the cone shape of the corneal protrusion. (From Dorland, 27th ed)
An excessive amount of fluid in the cornea due to damage of the epithelium or endothelium causing decreased visual acuity.
Gas lasers with excited dimers (i.e., excimers) as the active medium. The most commonly used are rare gas monohalides (e.g., argon fluoride, xenon chloride). Their principal emission wavelengths are in the ultraviolet range and depend on the monohalide used (e.g., 193 nm for ArF, 308 nm for Xe Cl). These lasers are operated in pulsed and Q-switched modes and used in photoablative decomposition involving actual removal of tissue. (UMDNS, 2005)

Central corneal thickness considered an index of corneal hydration of the UVB irradiated rabbit cornea as influenced by UVB absorber. (1/42)

UVB radiation from sunlight induces an acute corneal inflammation, photokeratitis, accompanied by changes in corneal hydration. We employed a method of ultrasonic pachymetry for daily examination of central corneal thickness as an index of corneal hydration of the rabbit cornea repeatedly irradiated by UVB radiation (312 nm, daily dose of 0.25 J/cm(2) during three or four days) as influenced by UVB absorber (actinoquinol combined with hyaluronic acid) dropped on the ocular surface during irradiation. One day after the third irradiation procedure the animals were sacrificed and corneas examined immuno-histochemically for peroxynitrite formation, a marker of oxidative damage, the antioxidant aldehyde dehydrogenase 3A1 and endothelial nitric oxide synthase, an enzyme generated nitric oxide. Results show that UV absorber combined with hyaluronic acid protected the cornea against UVB-induced changes in corneal thickness and microscopical disturbances to the cornea (both seen after buffered saline application) until the fourth experimental day. These UVB doses are equivalent to a daily exposure of 2.5 hrs of the human cornea to solar UVB radiation for three consecutive days. It is suggested that actinoquinol/ hyaluronic acid drops might be helpful for the human eye in the defence against photooxidative and other oxidative processes.  (+info)

Combining corneal hysteresis with central corneal thickness and intraocular pressure for glaucoma risk assessment. (2/42)

 (+info)

Seven-year changes in corneal power and aberrations after PRK or LASIK. (3/42)

 (+info)

Reproducibility and age-related changes of ocular parametric measurements in rabbits. (4/42)

 (+info)

A short-term in vivo experimental model for Fuchs endothelial corneal dystrophy. (5/42)

PURPOSE: We evaluated the in vivo functionality of a corneal endothelium tissue-engineered using corneal endothelial cells from human patients with Fuchs endothelial corneal dystrophy (FECD). METHODS: A total of 15 healthy cats underwent full-thickness corneal transplantation. All transplants were of xenogeneic human origin and all grafts but two were tissue-engineered. In seven animals the graft corneal endothelium was tissue-engineered using cultured corneal endothelial cells from humans with FECD (TE-FECD). Two control animals were grafted with an endothelium engineered using cultured endothelial cells from normal eye bank corneas (TE-normal). Two controls received a native full-thickness corneal transplant, and four other controls were grafted with the stromal carrier only (without endothelial cells). Outcome parameters included graft transparency (0, opaque to 4, clear), pachymetry, optical coherence tomography, endothelial cell morphometry, transmission electron microscopy (TEM), and immunostaining of function-related proteins. RESULTS: Seven days after transplantation, 6 of 7 TE-FECD grafts, all TE-normal grafts, and all normal native grafts were clear (transparency score >3), while all carriers-only grafts were opaque (score <1). The mean pachymetry was 772 +/- 102 mum for TE-FECD, 524 +/- 11 mum for TE-normal, 555 +/- 48 for normal native, and 1188 +/- 223 mum for carriers only. TEM showed subendothelial loose fibrillar material deposition in all TE-FECD grafts. The TE endothelium expressed Na(+)-K(+)/ATPase and Na(+)/HCO3(-). CONCLUSIONS: Restoration of transparency and corneal thickness demonstrated that the TE-FECD grafts were functional in vivo. This novel FECD seven-day living model suggests a potential role for tissue engineering leading to FECD cell rehabilitation.  (+info)

Corneal epithelial thickness mapping by Fourier-domain optical coherence tomography in normal and keratoconic eyes. (6/42)

 (+info)

Central corneal thickness in a Korean population: the Namil Study. (7/42)

 (+info)

Beveled femtosecond laser astigmatic keratotomy for the treatment of high astigmatism post-penetrating keratoplasty. (8/42)

 (+info)

Corneal pachymetry is a medical measurement of the thickness of the cornea, which is the clear, dome-shaped surface at the front of the eye. This measurement is typically taken using a specialized instrument called a pachymeter. The procedure is quick, painless, and non-invasive.

Corneal pachymetry is an essential test in optometry and ophthalmology for various reasons. For instance, it helps assess the overall health of the cornea, identify potential abnormalities or diseases, and determine the correct intraocular lens power during cataract surgery. Additionally, corneal thickness is a crucial factor in determining a person's risk for developing glaucoma and monitoring the progression of the disease.

In some cases, such as with contact lens fitting, corneal pachymetry can help ensure proper fit and minimize potential complications. Overall, corneal pachymetry is an essential diagnostic tool in eye care that provides valuable information for maintaining eye health and ensuring appropriate treatment.

Corneal topography is a non-invasive medical imaging technique used to create a detailed map of the surface curvature of the cornea, which is the clear, dome-shaped surface at the front of the eye. This procedure provides valuable information about the shape and condition of the cornea, helping eye care professionals assess various eye conditions such as astigmatism, keratoconus, and other corneal abnormalities. It can also be used in contact lens fitting, refractive surgery planning, and post-surgical evaluation.

The cornea is the clear, dome-shaped surface at the front of the eye. It plays a crucial role in focusing vision. The cornea protects the eye from harmful particles and microorganisms, and it also serves as a barrier against UV light. Its transparency allows light to pass through and get focused onto the retina. The cornea does not contain blood vessels, so it relies on tears and the fluid inside the eye (aqueous humor) for nutrition and oxygen. Any damage or disease that affects its clarity and shape can significantly impact vision and potentially lead to blindness if left untreated.

Diagnostic techniques in ophthalmology refer to the various methods and tests used by eye specialists (ophthalmologists) to examine, evaluate, and diagnose conditions related to the eyes and visual system. Here are some commonly used diagnostic techniques:

1. Visual Acuity Testing: This is a basic test to measure the sharpness of a person's vision. It typically involves reading letters or numbers from an eye chart at a specific distance.
2. Refraction Test: This test helps determine the correct lens prescription for glasses or contact lenses by measuring how light is bent as it passes through the cornea and lens.
3. Slit Lamp Examination: A slit lamp is a microscope that allows an ophthalmologist to examine the structures of the eye, including the cornea, iris, lens, and retina, in great detail.
4. Tonometry: This test measures the pressure inside the eye (intraocular pressure) to detect conditions like glaucoma. Common methods include applanation tonometry and non-contact tonometry.
5. Retinal Imaging: Several techniques are used to capture images of the retina, including fundus photography, fluorescein angiography, and optical coherence tomography (OCT). These tests help diagnose conditions like macular degeneration, diabetic retinopathy, and retinal detachments.
6. Color Vision Testing: This test evaluates a person's ability to distinguish between different colors, which can help detect color vision deficiencies or neurological disorders affecting the visual pathway.
7. Visual Field Testing: This test measures a person's peripheral (or side) vision and can help diagnose conditions like glaucoma, optic nerve damage, or brain injuries.
8. Pupillary Reactions Tests: These tests evaluate how the pupils respond to light and near objects, which can provide information about the condition of the eye's internal structures and the nervous system.
9. Ocular Motility Testing: This test assesses eye movements and alignment, helping diagnose conditions like strabismus (crossed eyes) or nystagmus (involuntary eye movement).
10. Corneal Topography: This non-invasive imaging technique maps the curvature of the cornea, which can help detect irregularities, assess the fit of contact lenses, and plan refractive surgery procedures.

Laser In Situ Keratomileusis (LASIK) is a type of refractive surgery used to correct vision issues such as myopia (nearsightedness), hyperopia (farsightedness), and astigmatism. The procedure involves reshaping the cornea, which is the clear, dome-shaped surface at the front of the eye, using an excimer laser.

In LASIK, a thin flap is created on the surface of the cornea using a femtosecond or microkeratome laser. The flap is then lifted, and the excimer laser is used to reshape the underlying tissue. After the reshaping is complete, the flap is replaced, allowing for quicker healing and visual recovery compared to other refractive surgery procedures.

LASIK is an outpatient procedure that typically takes about 30 minutes or less per eye. Most people can expect to see improved vision within a few days of the procedure, although it may take several weeks for vision to fully stabilize. LASIK has a high success rate and is generally considered safe when performed by a qualified surgeon. However, as with any surgical procedure, there are risks involved, including dry eye, infection, and visual complications such as glare or halos around lights.

Keratoconus is a degenerative non-inflammatory disorder of the eye, primarily affecting the cornea. It is characterized by a progressive thinning and steepening of the central or paracentral cornea, causing it to assume a conical shape. This results in irregular astigmatism, myopia, and scattering of light leading to blurred vision, visual distortions, and sensitivity to glare. The exact cause of keratoconus is unknown, but it may be associated with genetics, eye rubbing, and certain medical conditions. It typically starts in the teenage years and progresses into the third or fourth decade of life. Treatment options include glasses, contact lenses, cross-linking, and corneal transplantation in advanced cases.

Corneal edema is a medical condition characterized by the accumulation of fluid in the cornea, which is the clear, dome-shaped surface at the front of the eye. This buildup of fluid causes the cornea to swell and thicken, resulting in blurry or distorted vision. Corneal edema can be caused by various factors, including eye injuries, certain medications, eye surgeries, and diseases that affect the eye's ability to pump fluids out of the cornea. In some cases, corneal edema may resolve on its own or with treatment, but in severe cases, it may require a corneal transplant.

An excimer laser is a type of laser that is used in various medical procedures, particularly in ophthalmology and dermatology. The term "excimer" is derived from "excited dimer," which refers to a short-lived molecule formed when two atoms combine in an excited state.

Excimer lasers emit light at a specific wavelength that is determined by the type of gas used in the laser. In medical applications, excimer lasers typically use noble gases such as argon, krypton, or xenon, combined with halogens such as fluorine or chlorine. The most commonly used excimer laser in medical procedures is the excimer laser that uses a mixture of argon and fluoride gas to produce light at a wavelength of 193 nanometers (nm).

In ophthalmology, excimer lasers are primarily used for refractive surgery, such as LASIK and PRK, to correct vision problems like myopia, hyperopia, and astigmatism. The laser works by vaporizing tiny amounts of tissue from the cornea, reshaping its curvature to improve the way light is focused onto the retina.

In dermatology, excimer lasers are used for various skin conditions, including psoriasis, vitiligo, and atopic dermatitis. The laser works by emitting high-energy ultraviolet (UV) light that selectively targets and destroys the abnormal cells responsible for these conditions while leaving surrounding healthy tissue intact.

Excimer lasers are known for their precision, accuracy, and minimal side effects, making them a popular choice in medical procedures where fine detail and tissue preservation are critical.

... is essential for other corneal surgeries such as Limbal Relaxing Incisions. LRI is used to reduce corneal ... think of it as a corneal A-scan. Pachymetry using the corneal waveform allows the user to more accurately measure the corneal ... Pachymetry using the corneal waveform process allows the user to more accurately measure the corneal thickness, verify the ... The study reported that corneal thickness as measured by corneal pachymetry was an accurate predictor of glaucoma development ...
... intraoperative corneal pachymetry; and "wavefront-optimized" and "wavefront-guided" techniques which were introduced by the ... Both the depth of the corneal incisions and the degree of central corneal flattening correlated with the laser energy applied. ... Those with Fuchs' corneal endothelial dystrophy, corneal epithelial basement membrane dystrophy, retinal tears, autoimmune ... A soft corneal suction ring is applied to the eye, holding the eye in place. This step in the procedure can sometimes cause ...
Tanaka GH (April 1998). "Corneal pachymetry: a prerequisite for applanation tonometry?". Arch. Ophthalmol. 116 (4): 544-5. PMID ... Grieshaber MC, Schoetzau A, Zawinka C, Flammer J, Orgul S (June 2007). "Effect of central corneal thickness on dynamic contour ... A newer transpalpebral and transscleral tonometry method is not influenced by corneal biomechanics and does not need to be ... Measured values of intraocular pressure are influenced by corneal thickness and rigidity. As a result, some forms of refractive ...
The gold standard diagnostic test for PMD is corneal topography. However, it may not be as specific as corneal pachymetry, ... Pellucid marginal degeneration is diagnosed by corneal topography. Corneal pachymetry may be useful in confirming the diagnosis ... PMD lacks apical corneal scarring, Rizutti's phenomenon, Munson's sign, and the central corneal thickness is usually normal. ... Intacs implants, corneal collagen cross-linking, and corneal transplant surgery are additional options. Surgery is reserved for ...
"Central corneal thickness measured by the Orbscan II system, contact ultrasound pachymetry, and the Artemis 2 system". Journal ... "Repeatability of Layered Corneal Pachymetry with the Artemis Very High-Frequency Digital Ultrasound Arc-Scanner". Journal of ... "Repeatability of Layered Corneal Pachymetry with the Artemis Very High-Frequency Digital Ultrasound Arc-Scanner". Journal of ... Vanderbeek, Brian L; Silverman, Ronald H; Starr, Christopher E (2009). "Bilateral Salzmann-like nodular corneal degeneration ...
Corneal topography and pachymetry are used to screen for abnormal corneas. Furthermore, some people's eye shape may not permit ... Customized Transepithelial No-touch (C-TEN) is an innovative strategy[vague] for corneal surgery that avoids any corneal ... It involves cutting a flap in the cornea and pulling it back to expose the corneal bed, then using an excimer laser to ablate ... Intrastromal corneal ring segments (Intacs) are approved by FDA for treatment of low degrees of myopia. Phakic intraocular lens ...
It is also the principle used in corneal pachymetry, the mapping of corneal topography, done prior to refractive eye surgery ...
... measuring corneal thickness (pachymetry), and visual field testing. Glaucoma has been classified into specific types: Primary ... Also, the corneal appearance is not as hazy. A reduction in visual acuity can occur followed neuroretinal breakdown. Associated ... Acute angle closure glaucoma may further present with corneal edema, engorged conjunctival vessels and a fixed and dilated ... with temporal clear corneal phacoemulsification cataract surgery for open-angle glaucoma and visually significant cataract: one ...
Positive relative accommodation Vergence system Optokinetic system Amsler grid Gonioscopy Corneal topography Corneal pachymetry ... Fluorescein staining before slit lamp examination may reveal corneal abrasions or herpes simplex infection. The binocular slit- ...
... computerized corneal topography, endothelial microscopy, ultrasound pachymetry, b-scan sonography, keratometry and ... Corneal cross-linking (CXL) with riboflavin (vitamin B2) and UV-A light is a surgical treatment for corneal ectasia such as ... Corneal Collagen Cross-Linking on National Keratoconus Foundation website. Corneal Collagen Cross-Linking on EyeWiki from the ... "Corneal collagen crosslinking: A clinical update". "Corneal cross-linking" (PDF). Moorfields Eye Hospital NHS Foundation Trust ...
Other modalities, such as corneal thickness measurement (pachymetry), in-vivo confocal biomicroscopy, and specular microscopy ... The corneal endothelial cell layer and its basement membrane (Descemet's membrane) act as a barrier to hydration of the corneal ... In 1910, Fuchs first reported 13 cases of central corneal clouding, loss of corneal sensation and the formation of epithelial ... but may stress the corneal endothelium. Corneal transplantation is the definitive treatment for FECD. The most common types of ...
Direct corneal elevation measurements using multiple delay en face optical coherence tomography. J Biomed Opt. 2008 Sep-Oct;13( ... Keratoconus diagnosis with optical coherence tomography pachymetry mapping. Ophthalmology 2008 Dec;115(12):2159-66. (All ... High-speed optical coherence tomography of corneal opacities. Ophthalmology. 2007 Jul;114(7):1278-85. Plesea et al. ... have demonstrated the ability of OCT systems to depict pathology within the cornea as well as disorders of corneal topography. ...
Corneal pachymetry Corneal reflex Corneal tattooing Corneal topography Eye disease Keratometry List of keratins expressed in ... For corneal epithelial diseases such as Stevens Johnson Syndrome, persistent corneal ulcer etc., the autologous contralateral ( ... There is a global shortage of corneal donations, severely limiting the availability of corneal transplants across most of the ... The most common corneal disorders are the following: Corneal abrasion - a medical condition involving the loss of the surface ...
Corneal pachymetry is essential for other corneal surgeries such as Limbal Relaxing Incisions. LRI is used to reduce corneal ... think of it as a corneal A-scan. Pachymetry using the corneal waveform allows the user to more accurately measure the corneal ... Pachymetry using the corneal waveform process allows the user to more accurately measure the corneal thickness, verify the ... The study reported that corneal thickness as measured by corneal pachymetry was an accurate predictor of glaucoma development ...
... first a corneal marker was used to mark the thinnest corneal area, in guidance of the Scheimpflug tomography corneal pachymetry ... The Intraoperative Corneal Pachymetry Changes during Accelerated Corneal Cross-linking in Progressive Keratoconus Patients with ... The Intraoperative Corneal Pachymetry Changes during Accelerated Corneal Cross-linking in Progressive Keratoconus Patients with ... To report the intraoperative corneal pachymetry changes during accelerated corneal cross-linking (A-CXL) in progressive ...
Corneal pachymetry/specular microscopy *Specialized color vision tests *Electrophysiological tests. However, there may be ... may be from corneal topography), and IOL calculations and selection would be anticipated to be performed. ...
Corneal pachymetry. *Electrooculography (EOG). *Electroretinography (ERG). *External photography. *Fluorescein angiography (FA) ...
A corneal thickness measurement (pachymetry) is needed to get a correct pressure measurement. ... Tell your provider if you have a history of corneal ulcers or eye infections, or a history of glaucoma in your family. Always ... If the applanation method is used, there is a small chance the cornea may be scratched (corneal abrasion). The scratch will ...
Corneal Pachymetry. Corneal Topography. Corneal Sensitivity Testing. Day 3. Refractive Surgery. Refractive Surgery Assisting ...
Corneal pachymetry at least 560 µm at 6 mm. * Corneal curvature between 41-44 D ... or any corneal abnormality (ie, recurrent corneal erosion, severe basement membrane disease); (3) recurrent history of herpes ... Corneal modeling of keratoconus by conductive keratoplasty. J Cataract Refract Surg. 2005 Jan. 31(1):190-7. [QxMD MEDLINE Link] ... J James Rowsey, MD Former Director of Corneal Services, St Lukes Cataract and Laser Institute. J James Rowsey, MD is a member ...
Corneal Pachymetry L33631 10/01/2015 01/01/2020 Outpatient Physical and Occupational Therapy Services ...
Aspheric intraocular lenses have been introduced to be either neutral to SA or to compensate for a certain amount of corneal SA ... In the young phakic eye, the crystalline lens compensates for a certain amount of this corneal aberration. However, the ... Comparison of corneal tomography: Repeatability, precision, misalignment, mean elevation, and mean pachymetry. Current Eye ... The calculation of corneal SA requires highest precision of corneal topography in the periphery, since the difference in ...
... corneal topography and pachymetry. Such a level of instrumentation allows the team of Visions Michael Hare to detect and ...
Corneal Pachymetry. -This is done using computerized apparatus, which measures the corneal thickness in multiple locations. As ... Corneal Topography. -Focuses on the shape of the cornea. If keratoconus progresses the corneal shape will also change. ... Even though it is a last resort corneal transplantation is a great option when performed by an experienced corneal ... Corneal transplantion.. This is ideal only for people who suffer serious visual impairment contact lenses have been proven to ...
... and pachymetry, which measures the thickness of the cornea. In some cases, a corneal biopsy may be necessary to confirm the ... They offer various treatment options, including corneal cross-linking, intrastromal corneal ring segments, and specialty ... including corneal cross-linking, Intacs, and corneal transplant. By working closely with an eye doctor and making lifestyle ... They will then lift the flap and use a different laser, called an excimer laser, to remove some of the corneal tissue and ...
In patients with a history of intraocular surgery, an evaluation of the corneal endothelium, pachymetry, and, if warranted, an ... Topography-Guided Corneal Ablations with WAVELIGHT Platform: A Summary of Visual Outcomes ... endothelial cell count can help the surgeon predict the risk of postoperative corneal edema. ...
... keratoconus progression was confirmed by serial differential corneal topographies and differential optical pachymetry analysis ... We performed corneal deepithelialization, followed by the application of 0.1% riboflavin in 20% dextran solution to the corneal ... CXL appears to effectively improve UCVA and BCVA by significantly reducing corneal apical keratometry and corneal and total ... noninflammatory corneal dystrophy characterized by changes in the structure and organization of corneal collagen. It results in ...
Corneal Cross-linking (CXL). *Corneal Pachymetry. *Diabetic Retinopathy Treatment. *Eye Muscle Repair ...
... corneal pachymetry; biomicroscopy of the anterior segment; intraocular pressure (IOP) measurement; gonioscopy; funduscopy; ...
Corneal thickness measurement (pachymetry), anterior segment biomicroscopic examination, angle examination and dilatation of ...
By retaining a flap of corneal epithelium, LASEK may decrease the risk of infection and incidence of corneal haze, while ... Example of corneal topography. This image depicts a large inferior cone (or bulging of the cornea) along the contour of the ... Example of corneal topography. This image depicts a large inferior cone (or bulging of the cornea) along the contour of the ... Image of corneal haze following refractive surgery, as viewed through a slit lamp. Image courtesy of Ronald R. Krueger, MD, ...
Pachymetry Measurement of Corneal Thickness. Treatment of Glaucoma There are three main methods that Dr. Scott Buck can use to ...
Ultrasonic pachymetry measures each patients corneal thickness prior to surgery. Measurements range from 420 microns to 600 ... The corneal contour is gently curved. The body tolerates this shape and exhibits little or no tissue response. Enhancement ... You will sacrifice too much corneal tissue and risk ectasia [weakening and bulging of the cornea]," explained Dr. Lewis.. Jose ... I can consider pupil size, refractive error, and corneal thickness and select the ideal ablation pattern.". Another advantage ...
Change from baseline in Central Corneal Thickness (CCT) as measured by pachymetry [Time Frame: 12 months] ... 1. Keratoconus or other conditions of corneal thinning/ectasia 2. Progressive stromal or anterior corneal dystrophies 3. Pre- ... A Safety and Efficacy Study of Corneal Injection for Endothelial Dysfunction Using Human Corneal Endothelial Cell Therapy in ... Single Center Clinical Evaluation of Corneal Injection for Endothelial Dysfunction Using Human Corneal Endothelial Cell Therapy ...
saves time and efforts) 3. No Pachymetry (CCT) adjustments needed for Diaton tonometry variability of Central Corneal Thickness ... IOP results with Diaton tonometer are completely independent of thin or thick corneal biometrics as IOP with Diaton is measured ... CCT) may greatly affect corneal tonometry device results in either direction. ...
Additionally, we will use the Fast Screening Report to detect changes in corneal topography, pachymetry and anterior chamber ... The worldwide first lens was a Scleral lens and not a corneal contact lens. But very soon after the first invention in 1888 ...
Pachymetry - Accurate corneal thickness measurements are essential to evaluate that adequate corneal thickness is present for ... Corneal topography - Corneal topography is a valuable three dimensional imaging tool to map the surface of the cornea as well ... Keratometry - measurement of the corneal curvature is important to evaluate the corneal shape pre-operatively. ...
... required for diagnosis of all types of bullous keratopathy is increased corneal thickness as measured by ultrasonic pachymetry ... Subepithelial fluid-filled bullae form on the corneal surface as the corneal stroma (the deeper dense connective tissue layer ... Bullous keratopathy is caused by edema of the cornea, most frequently due to Fuchs corneal endothelial dystrophy or corneal ... Slit-lamp examination of all types of bullous keratopathy reveals corneal epithelial bullae and swelling of the corneal stroma ...
Pachymetry can help clarify your diagnosis because corneal thickness has the potential to influence eye pressure readings.. ... Pachymetry. Last, your eye doctor may want to use pachymetry as another way to confirm a diagnosis. Pachymetry measures the ...
Explore the vital significance of corneal thickness in determining LASIK eligibility and outcomes. Learn how this key factor ... which includes measuring your corneal thickness-a process known as pachymetry. This quick, painless test provides precise ... Heres where corneal thickness comes into play: To safely perform LASIK, there needs to be enough corneal tissue to create the ... Why Does Corneal Thickness Matter for LASIK?. Imagine your cornea as the clear, protective front cover of your eye. It serves ...
Pachymetry Test - Like the corneal topography test, the pachymetry test is used to gather information about the cornea which ... Corneal Topography Test - One of the first tests that are part of the LASIK eye exam is corneal topography which measures the ... LASIK candidates will need a certain amount of corneal thickness to be reshaped during the procedure. ...
  • Exclusion criteria included corneal thickness less than 400 µm at the thinnest point, a history of herpetic keratitis, severe dry eye, concurrent corneal infections, concomitant autoimmune diseases, previous ocular surgery, and patients with central or paracentral opacities. (crstodayeurope.com)
  • State of the art equipment allows the provision of digital retinal and slit lamp biomicroscope photography, ocular coherence tomography (OCT), visual field analysis, corneal topography and pachymetry. (truelocal.com.au)
  • Diagnosing this typically involves a comprehensive eye exam, which may include a visual acuity test, corneal topography, and pachymetry, which measures the thickness of the cornea. (regionalvoices.net)
  • Corneal topography - Corneal topography is a valuable three dimensional imaging tool to map the surface of the cornea as well as detecting a variety of corneal abnormalities. (dejageropt.co.za)
  • Corneal Topography Test - One of the first tests that are part of the LASIK eye exam is corneal topography which measures the shape of the corneas. (inlandeye.com)
  • Pachymetry Test - Like the corneal topography test, the pachymetry test is used to gather information about the cornea which will determine a patient's eligibility for LASIK. (inlandeye.com)
  • Corneal pachymetry is the process of measuring the thickness of the cornea. (wikipedia.org)
  • Corneal Pachymetry is essential prior to a refractive surgery procedure for ensuring sufficient corneal thickness to prevent abnormal bulging of the cornea, a side effect known as ectasia. (wikipedia.org)
  • Using this technology the user can capture an ultra-high definition echogram of the cornea, somewhat like a corneal A-scan. (wikipedia.org)
  • Pachymetry using the corneal waveform process allows the user to more accurately measure the corneal thickness, verify the reliability of the measurements that were obtained, superimpose corneal waveforms to monitor changes in a patient's cornea over time, and measure structures within the cornea such as micro bubbles created during femto-second laser flap cuts. (wikipedia.org)
  • Using this technology the user can capture an ultra high definition echogram of cornea, think of it as a corneal A-scan. (wikipedia.org)
  • If the applanation method is used, there is a small chance the cornea may be scratched ( corneal abrasion ). (medlineplus.gov)
  • Fyodorov encountered problems with consistency and maintenance of the temperature because the temperature (heated to as high as 600° C) went down as the hot needle entered the cornea (to a desired depth of up to 90% of corneal thickness). (medscape.com)
  • [ 10 ] CK uses high radiofrequency energy that is delivered with a thin metal tip in concentric rings of multiple spots around the corneal periphery, shrinking collagen and steepening the central cornea. (medscape.com)
  • One common surgical option is corneal cross-linking, which uses a special type of ultraviolet light to strengthen the cornea and prevent further thinning. (regionalvoices.net)
  • You will sacrifice too much corneal tissue and risk ectasia [weakening and bulging of the cornea]," explained Dr. Lewis. (ihatemyglasses.com)
  • IOP results with Diaton tonometer are completely independent of thin or thick corneal biometrics as IOP with Diaton is measured via Sclera and not via Cornea as all other tonometers (No need to purchase a pachymeter, saves time and efforts) 4. (tonometerdiaton.com)
  • Pachymetry measures the thickness of your cornea, the clear window at the front of the eye. (envisionboulder.com)
  • Bullous keratopathy is caused by edema of the cornea, resulting from failure of the corneal endothelium to maintain the normally transparent, dehydrated state of the cornea. (msdmanuals.com)
  • Subepithelial fluid-filled bullae form on the corneal surface as the corneal stroma (the deeper dense connective tissue layer of the cornea) swells, leading to decreased visual acuity, loss of contrast, glare, and photophobia. (msdmanuals.com)
  • Bullous keratopathy is caused by edema of the cornea, most frequently due to Fuchs corneal endothelial dystrophy or corneal endothelial trauma. (msdmanuals.com)
  • The process involves creating a thin flap in the cornea, then using a laser to remove a precise amount of corneal tissue. (statusworlds.com)
  • Here's where corneal thickness comes into play: To safely perform LASIK, there needs to be enough corneal tissue to create the flap and reshape the cornea without compromising its integrity. (statusworlds.com)
  • Aspheric intraocular lenses have been introduced to be either neutral to SA or to compensate for a certain amount of corneal SA. (intechopen.com)
  • LASIK candidates will need a certain amount of corneal thickness to be reshaped during the procedure. (inlandeye.com)
  • It is used to perform corneal pachymetry prior to refractive surgery, for Keratoconus screening, LRI surgery and is useful in screening for patients suspected of developing glaucoma among other uses. (wikipedia.org)
  • Corneal pachymetry is also considered an important test in the early detection of glaucoma. (wikipedia.org)
  • The study reported that corneal thickness as measured by corneal pachymetry was an accurate predictor of glaucoma development when combined with standard measurements of intraocular pressure. (wikipedia.org)
  • As a result of this study and others that followed, corneal pachymetry is now widely used by both glaucoma researchers and glaucoma specialists to better diagnose and detect early cases. (wikipedia.org)
  • Tell your provider if you have a history of corneal ulcers or eye infections , or a history of glaucoma in your family. (medlineplus.gov)
  • Since its introduction, LASIK has been associated with various complications, specifically when performed on eyes with decreased corneal thickness, irregular astigmatism, dryness, preexisting ocular surface disease, or glaucoma, to the point where several of these entities have become relative contraindications to performing LASIK. (medscape.com)
  • Questionnaires, eye examinations (visual acuity, contrast sensitivity at 2.5% and 1.25% contrast, slit lamp biomicroscopy, and pachymetry), and industrial hygiene monitoring for DMIPA and DMAE were performed over a two week period. (cdc.gov)
  • Exposure to tertiary amines was associated with blurry, halo, and blue-grey vision , corneal opacity, and decrements in visual acuity and contrast sensitivity at 2.5% contrast. (cdc.gov)
  • Concepts of corneal refractive surgery, such as keratectomy, keratotomy, and thermokeratoplasty, were first described in 1898 by Lans who published a set of experiments that focused on treating astigmatism in rabbits. (medscape.com)
  • Refractive surgery, as it is known today, was not realized until 1966 when Pureskin first appreciated its potential with the demonstration that refractive changes could be made by removing central tissue underneath a corneal flap. (medscape.com)
  • I can consider pupil size, refractive error, and corneal thickness and select the ideal ablation pattern. (ihatemyglasses.com)
  • Also required for diagnosis of all types of bullous keratopathy is increased corneal thickness as measured by ultrasonic pachymetry. (msdmanuals.com)
  • Current treatment modalities include excimer laser ablation of the corneal periphery via either photorefractive keratoplasty (PRK) or LASIK and shrinkage of collagen in a circular pattern in the corneal periphery (eg, LTK). (medscape.com)
  • Buratto performed excimer laser ablation on the posterior surface of the resected corneal disc before replacing and resuturing it back to its original position. (medscape.com)
  • Pallikaris then used the excimer laser ablation on the corneal stromal bed under a hinged flap in rabbit corneas. (medscape.com)
  • LRI is used to reduce corneal astigmatism by placing a pair of incisions of a particular depth and arc length at a steep axis of corneal astigmatism. (wikipedia.org)
  • Keratoconus is a degenerative disease that leads to steep and irregular astigmatism due to progressive corneal stromal thinning with onset at puberty in most cases [ 1 , 2 ]. (ekjo.org)
  • Progression was defined as a change in either myopia and/or astigmatism of at least 3.00 D in the previous 6 months, a change of at least 1.50 D in the mean central keratometry observed in three consecutive topographies during the preceding 6 months, or a decrease in mean central corneal thickness of at least 5% in three consecutive tomographies performed in the previous 6 months. (crstodayeurope.com)
  • Bullous keratopathy is the presence of corneal epithelial bullae, resulting from corneal endothelial disease. (msdmanuals.com)
  • To report the intraoperative corneal pachymetry changes during accelerated corneal cross-linking (A-CXL) in progressive keratoconus patients with thin corneas. (ekjo.org)
  • Corneal collagen cross-linking (CXL) is the only procedure to halt the progression of keratoconus [ 3 ]. (ekjo.org)
  • If keratoconus progresses the corneal shape will also change. (theeyepractice.com.au)
  • Keratoconus is a slowly progressive, noninflammatory corneal dystrophy characterized by changes in the structure and organization of corneal collagen. (crstodayeurope.com)
  • After observing pachymetry loss of 186 µm over a span of 5 months in one of our young patients with progressive keratoconus (Figure 1), we decided to treat pediatric patients with corneal collagen crosslinking (CXL). (crstodayeurope.com)
  • Preoperative keratoconus progression was confirmed by serial differential corneal topographies and differential optical pachymetry analysis in all eyes. (crstodayeurope.com)
  • Inclusion criteria were documented keratoconus progression in the previous 6 months, corneal thickness of at least 400 µm at the thinnest point, and age under 18 years. (crstodayeurope.com)
  • We performed corneal deepithelialization, followed by the application of 0.1% riboflavin in 20% dextran solution to the corneal stroma for 30 minutes. (crstodayeurope.com)
  • This technique involved the use of alcohol to separate the corneal epithelium from the stroma to create an epithelial sheet that could be repositioned over the ablated stroma. (medscape.com)
  • Slit-lamp examination of all types of bullous keratopathy reveals corneal epithelial bullae and swelling of the corneal stroma. (msdmanuals.com)
  • Slit-lamp examination reveals corneal epithelial bullae and swelling of the corneal stroma. (msdmanuals.com)
  • Ultrasonic pachymetry measures each patient's corneal thickness prior to surgery. (ihatemyglasses.com)
  • Pachymetry - Accurate corneal thickness measurements are essential to evaluate that adequate corneal thickness is present for the treatment needed. (dejageropt.co.za)
  • Newer generations of ultrasonic pachymeters work by way of Corneal Waveform (CWF). (wikipedia.org)
  • The newer generation of ultrasonic pachymeters work by way of Corneal Waveform (CWF). (wikipedia.org)
  • Keratometry - measurement of the corneal curvature is important to evaluate the corneal shape pre-operatively. (dejageropt.co.za)
  • Intraoperative corneal pachymetric changes were noted before the procedure, after removal of epithelium, after RF-HPMC instillation, before and after UV irradiation. (ekjo.org)
  • Conductive keratoplasty (CK) is a safe non-ablative, corneal procedure for the treatment of low hyperopia and presbyopia. (medscape.com)
  • In this blog, we'll explore why corneal thickness matters, how it affects the LASIK procedure, and what alternatives might be available if you're not an ideal candidate. (statusworlds.com)
  • Understanding the importance of corneal thickness for LASIK surgery is crucial for anyone considering this life-changing procedure. (statusworlds.com)
  • In some cases, a corneal biopsy may be necessary to confirm the diagnosis. (regionalvoices.net)
  • Last, your eye doctor may want to use pachymetry as another way to confirm a diagnosis. (envisionboulder.com)
  • Pachymetry can help clarify your diagnosis because corneal thickness has the potential to influence eye pressure readings. (envisionboulder.com)
  • After the application of RF-HPMC solution the mean thinnest corneal pachymetry (TCP) increased to 412.89 ± 26.94 μm. (ekjo.org)
  • In this study the changes of intraoperative thinnest corneal pachymetry (TCP) were evaluated during A-CXL protocol in thin keratoconic corneas. (ekjo.org)
  • Newer generation pachymeters have the ability to adjust the intraocular pressure that is measured according to the corneal thickness. (wikipedia.org)
  • By retaining a flap of corneal epithelium, LASEK may decrease the risk of infection and incidence of corneal haze, while reducing recovery time and postoperative discomfort when compared with PRK. (medscape.com)
  • The contact methods, such as ultrasound and optical such as confocal microscopy (CONFOSCAN), or noncontact methods such as optical biometry with a single Scheimpflug camera (such as SIRIUS or PENTACAM), or a Dual Scheimpflug camera (such as GALILEI), or Optical Coherence Tomography (OCT, such as Visante) and online Optical Coherence Pachymetry (OCP, such as ORBSCAN). (wikipedia.org)
  • Most frequently, it is due to Fuchs corneal endothelial dystrophy or corneal endothelial trauma. (msdmanuals.com)
  • Fuchs dystrophy is a genetic disorder that causes bilateral, progressive corneal endothelial cell loss, sometimes leading to symptomatic bullous keratopathy by age 50 to 60. (msdmanuals.com)
  • A corneal thickness measurement (pachymetry) is needed to get a correct pressure measurement. (medlineplus.gov)
  • The mean of corneal pachymetric values were compared statistically. (ekjo.org)
  • Why Does Corneal Thickness Matter for LASIK? (statusworlds.com)
  • Before LASIK, your eye doctor will conduct a thorough eye examination, which includes measuring your corneal thickness-a process known as pachymetry. (statusworlds.com)
  • Corneal endothelial trauma can occur during intraocular surgery (eg, cataract removal) or after placement of a poorly designed or malpositioned intraocular lens implant. (msdmanuals.com)
  • In one of the alternative treatment protocol, it is aimed to swell the corneal thickness to above 400 μm before UV irradiation by using hypo-osmolar riboflavin (HO-RF) with RF-DX [ 10 - 12 ]. (ekjo.org)
  • They offer various treatment options, including corneal cross-linking, intrastromal corneal ring segments, and specialty contact lenses, to improve vision and slow down the progression of the disease. (regionalvoices.net)
  • By using the corneal pachymetry the surgeon will reduce the chances of perforation of the eye and improves surgical outcome. (wikipedia.org)
  • This is done using computerized apparatus, which measures the corneal thickness in multiple locations. (theeyepractice.com.au)
  • Noninvasive exam, allowing us to analyze the morphology of the endothelial cells and count them, evaluate the shape, number, size and corneal thickness. (oftalconde.com)
  • In some cases, a corneal transplant may be necessary to restore vision. (regionalvoices.net)
  • While the cause of the condition is not fully understood, there are a number of effective treatments available, including corneal cross-linking, Intacs, and corneal transplant. (regionalvoices.net)
  • No Pachymetry (CCT) adjustments needed for Diaton tonometry variability of Central Corneal Thickness (CCT) may greatly affect corneal tonometry device results in either direction. (tonometerdiaton.com)
  • During this consultation, you'll discuss not just your corneal thickness but also your lifestyle, vision goals, and any concerns you might have. (statusworlds.com)
  • The risk of corneal opacity rose with increasing exposure to total amines. (cdc.gov)
  • Corneal pachymetry is essential for other corneal surgeries such as Limbal Relaxing Incisions. (wikipedia.org)