Corneal Topography
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.
Cornea
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)
Diagnostic Techniques, Ophthalmological
Keratomileusis, Laser In Situ
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.
Keratoconus
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)
Corneal Edema
Lasers, Excimer
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)
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Author Response: Transforming Growth Factor Beta Switch in Aqueous Humor of Patients With Fuchs Endothelial Corneal Dystrophy ...
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Thickness profiles of the corneal epithelium along the steep and flat meridians of astigmatic corneas after orthokeratology |...
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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 ...
LASIK
... 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 ...
Intraocular pressure
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 ...
Pellucid marginal degeneration
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 ...
D. Jackson Coleman
"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 ...
Refractive surgery
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 for corneal surgery that avoids any corneal manipulation ... 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 ...
Glaucoma
... methods such as Goldmann tonometry may be augmented with pachymetry to measure the central corneal thickness (CCT). A thicker ... Also, the corneal appearance is not as hazy. A reduction in visual acuity can occur followed neuroretinal breakdown. Associated ... As all methods of tonometry are sensitive to corneal thickness, ... such as by corneal hydration or elastic properties), it is ... with temporal clear corneal phacoemulsification cataract surgery for open-angle glaucoma and visually significant cataract: one ...
Scheimpflug principle
It is also the principle used in corneal pachymetry, the mapping of corneal topography, done prior to refractive eye surgery ...
Eye examination
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- ...
Corneal cross-linking
... computerized corneal topography, endothelial microscopy, ultrasound pachymetry, b-scan sonography, keratometry and ... Corneal cross-linking 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 ...
OCT Biomicroscopy
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. Eye ... 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. ...
Fuchs' dystrophy
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 ...
Cornea
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 ...
Best 43 Corneal pachymetry Clinics 2022 ▷ cost, doctor reviews | Bookimed
43 Clinics for Corneal pachymetry. ➔ ➔ ➔ The hospitals ranking is based on 1 requests, prices, and information from clinics ... Bookimed assistant helps you find the best option for corneal pachymetry Get up to 3 top Corneal pachymetry offers ... Explore 43 Verified Corneal pachymetry Clinics This hospital ranking is based on such factors:. - number of patients who have ... Top 43 Corneal pachymetry Clinics 2022: Find the Right for You. Medically reviewed by Fahad Mawlood Medical Editor & Data ...
Study to Evaluate the Safety and Efficacy of Epi-on Corneal Cross-linking in Eyes With Progressive Keratoconus - Full Text View...
Corneal pachymetry that is , 325 microns at the thinnest point measured by Pentacam in the eye to be treated; ... History of corneal disease (e.g., herpes simplex, herpes zoster keratitis, corneal melt, corneal dystrophy, etc.); ... Study to Evaluate the Safety and Efficacy of Epi-on Corneal Cross-linking in Eyes With Progressive Keratoconus. The safety and ... Maximum corneal curvature, as measured by Kmax of ≥ 47.00 D;. *Presence of central or inferior steepening on the Pentacam ...
Edmonds & Associates / Great Valley Eye Associates - Michigan College Of Optometry
COMPARISON OF CENTRAL CORNEAL THICKNESS MEASUREMENTS WITH THE GALILEI DUAL SCHEIMPFLUG ANALYZER AND ULTRASOUND PACHYMETRY ...
COMPARISON OF CENTRAL CORNEAL THICKNESS MEASUREMENTS WITH THE GALILEI DUAL SCHEIMPFLUG ANALYZER AND ULTRASOUND PACHYMETRY ... Keywords: Applanation ultrasound pachymetry,, Central corneal thickness, Galilei dual scheimpflug analyzer Abstract. Objective ... Conclusions: The pachymetry readings with GSA showed strong and positive correlation with those of US pachymetry. So GSA may be ... For right eye the mean central corneal thickness measured by the Galilei dual Scheimpflug analyzer and Ultrasound pachymetry ...
Tonometry: MedlinePlus Medical Encyclopedia
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 ...
Laser in situ Keratomileusis (LASIK) - American Academy of Ophthalmology
Corneal perforation also can occur with LASIK on an excessively thin cornea. Corneal thickness must be measured with pachymetry ... Measuring corneal thickness using pachymetry is important before LASIK, because to avoid corneal ectasia, an adequate stromal ... Corneal Perforation. Corneal perforation is a rare but devastating intraoperative complication that can occur if the ... Second, use of a cryolathe to freeze the corneal cap for precise lenticular reshaping of corneal tissue. The cryolathe was ...
Primary Open-Angle Glaucoma (POAG): Practice Essentials, Background, Pathophysiology
... most likely describing a patient having corneal edema or rapid evolution of a cataract precipitated by chronic elevate... ... Significant subsets of higher and lower risk exist when pachymetry (central corneal thickness [CCT]) is taken into account (see ... Annette H, Kristina L, Bernd S, Mark-Oliver F, Wolfgang W. Effect of central corneal thickness and corneal hysteresis on ... Human corneal thickness and its impact on intraocular pressure measures: a review and meta-analysis approach. Surv Ophthalmol. ...
Anwar versus Melles deep anterior lamellar keratoplasty for keratoconus: a prospective randomized clinical trial
... corneal thicknesses, and endothelial cell densities. However, patients who underwent the Anwar technique showed better contrast ... Corneal Pachymetry * Corneal Transplantation / methods* * Corneal Wavefront Aberration / physiopathology * Double-Blind Method ... Secondary outcomes were spherical equivalent, contrast sensitivity, corneal aberrations, corneal biomechanical properties, ... Corneal hysteresis was not significantly different between the 2 groups (9.9 ± 0.8 vs. 9.9 ± 0.6; P = 0.606). The corneal ...
Corneal Modifications | AOA
Corneal modification procedures may eliminate the need for eyeglasses or contact lenses or reduce the power of a prescription. ... Pachymetry. Measurement of corneal thickness. Methods of measurement are based on wave reflection of optical light or ... Intrastromal corneal ring segments are currently being investigated to reduce myopia in patients with keratoconus and corneal ... The incisional surgical procedure used to correct corneal astigmatism. Arcuate incisions are placed in the corneal mid- ...
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Assessment of Eye Bank-Prepared Posterior Lamellar Corneal Tissue for Endothelial Keratoplasty<...
Methods: Corneal-scleral discs were obtained. Specular microscopy and pachymetry were performed. A designated Tissue Banks ... Results: Donor corneal pachymetry before sectioning averaged 599±52 μm. Immediately after sectioning with a microkeratome set ... Methods: Corneal-scleral discs were obtained. Specular microscopy and pachymetry were performed. A designated Tissue Banks ... Results: Donor corneal pachymetry before sectioning averaged 599±52 μm. Immediately after sectioning with a microkeratome set ...
CRSToday | Top Surgeons Highlight Key Blades
After performing corneal pachymetry, I set the LRI diamond blade at 90% of the thinnest reading obtained. This technique ... My incision is a near-clear corneal incision that begins with a groove. It is followed by a second plane, made with a diamond ... This dedicated diamond blade for corneal MICS allows me easy entrance into the eye, and the microincision remains watertight ...
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Primary Congenital Glaucoma - EyeWiki
Pachymetry is used to measure central corneal thickness. The central cornea may be thicker due to corneal edema, and has also ... High IOP causes corneal edema and corneal stretching with development of Haab striae. With prolonged corneal edema, both ... Diffuse corneal edema and/or focal corneal edema or opacification may obscure Haab striae. The anterior segment exam should ... Corneal transplantation for corneal opacification is avoided if possible due to high risk of failure and complications in young ...
LASIK for Correction of Myopia Workup: Other Tests
The surgical technique involves the creation of a hinged lamellar corneal flap, after which an excimer laser is used to make a ... Ultrasound corneal pachymetry. Pachymetry is an important part of the refractive surgery workup. ... Corneal topography is a method of measuring and quantifying the shape and the curvature of the corneal surface. Most ... Corneal Topography and the Corneal Modeling System. Mediguide Ophthalmology. 1991. 6:1-5. ...
Measurements of Corneal Thickness in Eyes with Pseudoexfoliation Syndrome: Comparative Study of Different Image Processing...
Corneal thickness measurements in the PEX group were statistically significantly different between Pentacam and OCT Casia: ... i,Conclusion.,/i, The central corneal thickness in eyes with PEX syndrome measured with three different independent methods is ... nasal and temporal corneal zones were statistically significantly different (,span class=inline_break,,svg xmlns:xlink=http ... higher than that in the non-PEX group, and despite variable peripheral corneal thickness, this one parameter is still crucial ...
Who Is a Candidate for LASIK? | The Eye Institute
... eye doctors often use a corneal pachymetry test to determine your corneal thickness. They will use a pachymetry probe to ... Corneal Shape and Thickness. The shape and consistency of your corneas could also play a role in determining your LASIK ... Since LASIK peels back a layer of your corneas, eye doctors want to ensure that youll still have a sufficient corneal ... Some patients might also experience abnormal healing of corneal flaps.. General Health. General health is also an important ...
Microincision cataract surgery shaping cataract future
Braga-Mele performed measuring corneal pachymetry. The microincision also enables early tight incision closure, which ... Together with the reduced corneal edema, these benefits account for faster and better visual recovery, Dr. Braga-Mele said. ... This translates into reduced turbulence in the anterior segment and consequently into less corneal edema, as confirmed by ...
Hysteresis: A Powerful Tool for Glaucoma Care
The measurement of corneal hysteresis has been slow to be adopted clinically compared to a corneal parameter such as pachymetry ... Corneal hysteresis and corneal thickness share some interesting parallels. Ophthalmologists became interested in corneal ... However, corneal pachymetry was quickly adopted for several reasons that havent applied to hysteresis. For one thing, the ... Corneal hysteresis is not an inherent property of a cornea; its more like a behavior. The fact that IOP and corneal hysteresis ...
Find Research outputs
- Yonsei University
DeCS
Corneal Pachymetry Entry term(s). Corneal Pachymetric Measurement Corneal Pachymetric Measurements Corneal Thickness ... Pachymetric Measurements, Corneal. Pachymetry, Corneal. Thickness Measurement, Corneal. Thickness Measurements, Corneal. Tree ... Pachymetric Measurement, Corneal Pachymetric Measurements, Corneal Pachymetry, Corneal Thickness Measurement, Corneal Thickness ... Corneal Thickness Measurements Measurement, Corneal Pachymetric Measurement, Corneal Thickness Measurements, Corneal ...
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Danicopan, an Oral Complement Factor D Inhibitor, Exhibits High and Sustained Exposure in Ocular Tissues in Preclinical Studies...
Corneal Crosslinking: Managing Keratoconus Beyond the Surface
Should pachymetry fail to show proper corneal thickness stipulated for treatment safety, hypotonic Photrexa riboflavin is ... Corneal haze. Unlike the rare event of PRK haze, CXL-associated corneal haze is common in the immediate post-CXL period (Figure ... Research also shows a similar pattern of recovery after standard CXL with keratometry, pachymetry and corneal haze measurements ... Corneal collagen crosslinking for keratoconus and corneal ectasia: One-year results. J Cataract Refract Surg. 2011;37(1):149-60 ...
Dry eye management may benefit patients with keratoconus
Reducing inflammation and managing corneal microtrauma are new strategies ... corneal wavefront, pachymetry analysis, and epithelial mapping. ... Corneal sensitivity and dry eye symptoms in patients with ... Investigators also noted local flattening and reduction of corneal curvatures after treatment measured by corneal topography.4 ... Mechanisms of corneal allograft rejection and regional immunosuppression. Eye (Lond). 2009;23(10):1894-1897. doi:10.1038/eye. ...
PakMediNet - Pakistan Armed Forces Medical Journal
Central cornealUltrasonic pachymetryRefractiveKeratoconusCorneaCollagenGlaucomaTransplantationEndotheliumTonometerEndothelialMeasurementsIntraocular pressurePachymeterTopographyStromaTonometryProcedureBiomicroscopyScheimpflugEdemaLASIKExaminationFundusCorrelationOcularMethodsFlapMicroincisionContrast SensitivityPatientsProtrusionStromal bedConclusionsHysteresisOpticalSecondaryTissueSpecular microscopyPrevalenceMicrokeratome
Central corneal12
- Central corneal thickness was measured in 100 eyes of 50 patients. (pafmj.org)
- For right eye the mean central corneal thickness measured by the Galilei dual Scheimpflug analyzer and Ultrasound pachymetry was 544.06μm ± 27.36 and 546.88μm ± 27.71 respectively, and for left eye it was 544.72μm ± 25.47 and 546.52μm ± 26.15 respectively. (pafmj.org)
- Mean central corneal thickness was 525.56 ± 47.87 μm versus 504.64 ± 54.20 μm in the Anwar and Melles groups, respectively (P = 0.155). (nih.gov)
- The central corneal thickness in eyes with PEX syndrome measured with three different independent methods is higher than that in the non-PEX group, and despite variable peripheral corneal thickness, this one parameter is still crucial in intraocular pressure measurements. (hindawi.com)
- Central corneal thickness was measured by ultrasonic pachymetry. (elsevier.com)
- Both binary indicators of severe disease and semiquantitative measures of disease severity were significantly heritable, with heritability estimates of 30% for severe disease, 37% to 39% for FECD score, and 47% for central corneal thickness. (elsevier.com)
- Central corneal thickness measurement with the Pentacam Scheimpflug system, optical low-coherence reflectometry pachymeter, and ultrasound pachymetry. (sciendo.com)
- 5. Al-Mezaine HS, Al-Amro SA, Kangave D, Sadaawy A, Wehaib TA, Al-Obeidan S. Comparison between central corneal thickness measurements by oculus pentacam and ultrasonic pachymetry. (sciendo.com)
- 13. Miglior S, Albe E, Guareschi M, Mandelli G, Gomarasca S, Orzalesi N. Intraobserver and interobserver reproducibility in the evaluation of ultrasonic pachymetry measurements of central corneal thickness. (sciendo.com)
- 14. Kitsos G, Gartzios C, Asproudis I, Bagli E. Central corneal thickness in subjects with glaucoma and in normal individuals (with or without pseudoexfoliation syndrome). (sciendo.com)
- Purpose: To compare and determine the repeatability of central corneal thickness (CCT) measurements using four noncontact pachymetry instruments in eyes with keratoconus. (who.int)
- Pocket IITM allows for a quick and reliable measurement of the central corneal thickness thanks to its 20 MHz probe. (eyeoptics.dk)
Ultrasonic pachymetry2
- Main Outcome Measures: Corneal tissue was assessed with the following parameters: corneal thickness measured with ultrasonic pachymetry, cell density counts measured with a keratoanalyzer, and cell viability as observed with trypan blue exclusion. (elsevier.com)
- Central ultrasonic pachymetry, keratometry and corneal biomicroscopy were also evaluated. (univr.it)
Refractive11
- Jose I. Barraquer, MD, described corneal lamellar surgery for the correction of refractive error in 1949. (aao.org)
- After the microkeratome cut the corneal cap, it was stabilized with suction in the inverted position on a forming die while the refractive cut was made by a second pass of the instrument on the stromal side of the corneal cap. (aao.org)
- This technique involved less trauma to the corneal cap, but the results remained suboptimal secondary to unpredictable refractive changes and irregular astigmatism. (aao.org)
- The Anwar and Melles techniques of DALK have comparable visual acuity and refractive outcomes, aberrometric profiles, biomechanical properties, corneal thicknesses, and endothelial cell densities. (nih.gov)
- This corneal scarring can obscure the visual axis or cause astigmatism with or without refractive amblyopia. (aao.org)
- Pachymetry is an important part of the refractive surgery workup. (medscape.com)
- CXL received two treatment labels from the Food and Drug Administration (FDA) in 2016: progressive keratoconus and corneal ectasia following refractive surgery. (reviewofoptometry.com)
- Keratoconus is described as a bilateral but asymmetric, noninflammatory, progressive degeneration of the cornea, leading to extreme refractive errors with impaired visual acuity and conical corneal protrusion. (optometrytimes.com)
- For patients who would like to have a refractive surgery, the value of the corneal thickness must be known. (vision-al.com)
- Pachymetry Map -9 mm pachymetry map highlights corneal irregularities and identifies thinnest point for refractive surgery screening. (digitaleyecenter.com)
- For refractive surgery, several measuring modes and corneal maps are available. (eyeoptics.dk)
Keratoconus7
- To evaluate the safety and efficacy of epithelium-on corneal collagen cross-linking (CXL) in impeding the progression of, and/or reducing corneal curvature (Kmax) in eyes with progressive keratoconus. (clinicaltrials.gov)
- In some cases, patients with corneal issues, such as cone-shaped corneas caused by Keratoconus , might be ineligible. (theeyeinstitute.com)
- Patients with any stage of keratoconus, including those with corneal grafts, require clinical differentiation between allergic conjunctivitis and dry eye. (optometrytimes.com)
- We conducted a study of 41 patients with keratoconus and poor vision despite spectacle or contact lens correction, poor contact lens tolerance, superficial corneal opacity, and pachymetry greater than 350 µm. (crstodayeurope.com)
- For patients with keratoconus is required regularly follow up and pachymetry to supervise this pathology and thinning of the cornea. (vision-al.com)
- Pachymetry is also performed on patients with keratoconus who previously done CROSS-LINKING , in this case to check the thickening of the cornea and the treatment favorable effects. (vision-al.com)
- IMSEAR at SEARO: Comparability and repeatability of pachymetry in keratoconus using four noncontact techniques. (who.int)
Cornea8
- If the applanation method is used, there is a small chance the cornea may be scratched ( corneal abrasion ). (medlineplus.gov)
- Leaving a narrow hinge of tissue allowed the outer cornea to become a flap that is reflected out of the way during the laser exposure, then returned to its original position and allowed to adhere through natural corneal dehydration to the underlying stromal bed (Figure 1). (aao.org)
- When the cornea does not have the correct shape and power for clear vision, a doctor of optometry may recommend one of several corneal modification techniques to correct the issue. (aoa.org)
- All corneal modification procedures alter the curvature of the cornea so that incoming light is refracted at an angle that allows it to focus precisely on the retina. (aoa.org)
- Quantitatively reduced and morphologically altered corneal endothelium in PEX eyes may lead to a distinct type of keratopathy which diffusely involves the entire cornea. (hindawi.com)
- Corneal hysteresis is defined as the difference between the pressure at which the cornea bends inward during an airjet applanation and the pressure at which it bends out again, as determined by an infrared laser during an intraocular pressure measurement. (reviewofophthalmology.com)
- Corneal Pachymetry is a procedure for measuring the thickness of the cornea. (vision-al.com)
- HD Cornea Scan - 9mm high-resolution scan, including versatile tools for measuring thickness of residual stromal bed, LASIK flap, and other corneal structures. (digitaleyecenter.com)
Collagen2
- However, the status quo is undergoing revolutionary modifications due to the recent FDA approval of corneal collagen crosslinking (CXL). (reviewofoptometry.com)
- While historically, management was limited to gas permeable contact lenses, or penetrating keratoplasty in severe cases, new treatments include early corneal collagen cross-linking (CXL), scleral contact lenses, Bowman's membrane transplants, and topography-guided photokeratoplasty with CXL. (optometrytimes.com)
Glaucoma9
- Tell your provider if you have a history of corneal ulcers or eye infections , or a history of glaucoma in your family. (medlineplus.gov)
- Here, I'd like review some of the recent clinical data regarding hysteresis, discuss possible explanations for what is actually being measured and talk about how measuring corneal hysteresis may be a significant aid when caring for glaucoma patients and suspects. (reviewofophthalmology.com)
- As you know, corneal thickness has become important in the management of glaucoma. (reviewofophthalmology.com)
- To our surprise, studies like the Ocular Hypertension Treatment Study re-vealed that corneal thickness was an independent risk factor for glaucoma progression. (reviewofophthalmology.com)
- For example, a drop in 40 µm of corneal thickness equates with about a 70-percent higher chance of developing glaucoma. (reviewofophthalmology.com)
- A person who has a pressure of 30 mmHg with a corneal thickness of 600 µm has half the glaucoma risk of someone who has a pressure of 20 mmHg-10 mmHg less-if that person also has a corneal thickness of 500 µm. (reviewofophthalmology.com)
- Ironically, that may have ended up being a distraction, because like corneal thickness, most of the accumulating data is showing hysteresis to be a risk factor for glaucoma-even a more significant risk factor than corneal thickness. (reviewofophthalmology.com)
- Ultrasound Pachymeter: measures corneal thickness for LASIK patients, glaucoma suspects, etc. (familyvisionclemson.com)
- Pachymetry has proven to be an essential tool in predicting glaucoma progression and helping patients management. (eyeoptics.dk)
Transplantation1
- finally, corneal transplantation is required to treat this condition [ 2 , 5 ]. (hindawi.com)
Endothelium5
- The intraocular cells involved in this production include nonpigmented ciliary epithelial cells, posterior pigment epithelial cells of the iris, pre-equatorial lens capsule epithelial cells, corneal endothelium, trabecular cells, endothelial cells of blood vessels and its adventitia, muscular cells, and ganglion cells of the retina. (hindawi.com)
- However, the procedure compromises the corneal endothelium, which is usually still healthy in eyes with this disease, and puts patients at risk for immunologic rejection. (crstodayeurope.com)
- Common principles for these techniques include selective removal of only pathologic tissue, preserving the deeper corneal layers (ie, Descemet's membrane and endothelium), and restoration of normal corneal thickness with a lamellar graft. (crstodayeurope.com)
- Slit-lamp examination revealed an irregular appearance of the corneal endothelium of the right eye with an abnormal iris surface. (medscape.com)
- Photograph of the anterior segment of the right eye, showing an irregular corneal endothelium and abnormal surface of the iris. (medscape.com)
Tonometer1
- The correlation between corneal thickness and IOP was statistically significant both for the Goldmann (r = 0.510, p = 0.021) and for the Ocuton S tonometer (r = 0.520, p = 0.019). (univr.it)
Endothelial2
- The corneal endothelial pattern was evaluated using noncontact endothelial specular microscopy. (crstodayeurope.com)
- Purpose: To describe the methods for family and case-control recruitment for a multicenter genetic and associated heritability analyses of Fuchs endothelial corneal dystrophy (FECD). (elsevier.com)
Measurements4
- 7. Muscat S, McKay N, Parks S, Kemp E, Keating D. Repeatability and reproducibility of corneal thickness measurements by optical coherence tomography. (sciendo.com)
- Corneal thickness measurements and visual function abnormalities in ocular hypertensive patients. (sciendo.com)
- 16. Iskander NG, Anderson Penno E, Peters NT, Gimbel HV, Ferensowicz M. Accuracy ofOrbscan pachymetry measurements and DHG ultrasound pachymetry in primary laser in situ keratomileusis and LASIK enhancement procedures. (sciendo.com)
- Comparison of corneal thickness measurements using ultrasound and Orbs can slit¬scanning topography in normal and post-LASIK eyes. (sciendo.com)
Intraocular pressure3
- Even moderate rises in intraocular pressure (IOP) or surgical manipulations in the anterior chamber may trigger corneal oedema and decompensation. (hindawi.com)
- To know the real value of the intraocular pressure is necessary to know corneal thickness, it is when an pachymetry is required. (vision-al.com)
- 2. Doughty MJ, Zaman ML. Human corneal thickness and its impact on intraocular pressure measures: a review and meta-analysis approach. (sciendo.com)
Pachymeter1
- Corneal topography was performed during each examination, and corneal thickness was evaluated using a 50-MHz ultrasound pachymeter. (crstodayeurope.com)
Topography1
- However, if you can send us the exact pachymetry (corneal thickness) or the topography maps and reports that you may have, it will enable us to know which procedure is more suitable for your eyes. (lasikindia.in)
Stroma4
- Radiofrequency energy is delivered through a fine tip inserted into the corneal stroma. (aoa.org)
- At left, the saturation of riboflavin is visible in the corneal stroma after riboflavin loading (two-minute intervals for 30 minutes). (reviewofoptometry.com)
- After epithelial removal, the researchers saturated corneal stroma with riboflavin (a photosensitizer) and then exposed the treatment zone to an ultraviolet-A light with wavelength of 365nm. (reviewofoptometry.com)
- Some surgeons have recently begun using the excimer laser to remove the recipient corneal stroma, leaving a quality stromal bed surface. (crstodayeurope.com)
Tonometry3
- This includes facilitating knowledge, understanding and training in corneal pachymetry, visual fields, assessment of the anterior chamber, contact tonometry and disc evaluation. (cardiff.ac.uk)
- Ophthalmologists became interested in corneal thickness ini-tially because it was thought to be a factor that interfered with our ability to accurately measure IOP, particularly when using Goldmann applanation tonometry. (reviewofophthalmology.com)
- Unfortunately, many things may affect the accuracy of the readings - from your position during tonometry to your corneal thickness. (almagia.com)
Procedure3
- The incisional surgical procedure used to correct corneal astigmatism. (aoa.org)
- Since LASIK peels back a layer of your corneas, eye doctors want to ensure that you'll still have a sufficient corneal thickness for the procedure. (theeyeinstitute.com)
- They will use a pachymetry probe to determine whether your eyes can support the corneal flap created during the LASIK procedure. (theeyeinstitute.com)
Biomicroscopy1
- 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)
Scheimpflug2
- Comparative analysis of central and peripheral corneal thickness in PEX patients using three different imaging systems: Pentacam-Scheimpflug device, time-domain optical coherence tomography (OCT) Visante, and swept-source OCT Casia. (hindawi.com)
- 1 Modern diagnostic techniques include Scheimpflug imaging, corneal wavefront, pachymetry analysis, and epithelial mapping. (optometrytimes.com)
Edema4
- Elevated IOP is associated with the classic "triad" of symptoms (photophobia, epiphora and blepharospasm), which occurs due to rapid expansion of the child's eye causing buphthalmos (Greek = "ox eye"), corneal enlargement, horizontal or oblique breaks in Descemet membrane (Haab striae) and subsequent corneal edema and opacification. (aao.org)
- Optic nerve damage occurs, and focal corneal edema overlying Haab striae, which can be single or multiple, can lead to permanent corneal scarring and opacification. (aao.org)
- This translates into reduced turbulence in the anterior segment and consequently into less corneal edema, as confirmed by studies Dr. Braga-Mele performed measuring corneal pachymetry. (ophthalmologytimes.com)
- Together with the reduced corneal edema, these benefits account for faster and better visual recovery, Dr. Braga-Mele said. (ophthalmologytimes.com)
LASIK2
- During your LASIK screening process, eye doctors often use a corneal pachymetry test to determine your corneal thickness. (theeyeinstitute.com)
- There is no permanent treatment by laser for this, although some doctors advertise 'presbyopic LASIK', which is a laser treatment needing to be repeated every 1 or 1.5 years and is unsuccessful, hence not advocated by Dr Anand Shroff, our LASIK expert and Corneal surgeon. (lasikindia.in)
Examination1
- People who are interested in any of the corneal modifications should first have a comprehensive eye examination to evaluate their eye health and determine their vision needs. (aoa.org)
Fundus1
- Ability to Perform different types of OCT's, Visual fields, Corneal Pachymetry and Fundus photography and so much more. (livecareer.com)
Correlation2
- The pachymetry readings with GSA showed strong and positive correlation with those of US pachymetry. (pafmj.org)
- A rationally designed synthetic antimicrobial peptide against Pseudomonas-associated corneal keratitis: Structure-function correlation. (aston.ac.uk)
Ocular1
- In recent years, a new instrument (Reicherts's Ocular Response Analyzer) has brought to light a previously unmeasured corneal characteristic-hysteresis-that is turning out to have multiple clinical uses. (reviewofophthalmology.com)
Methods1
- Methods: Corneal-scleral discs were obtained. (elsevier.com)
Flap1
- This is calculated as follows: initial pachymetry minus calculated (or measured) flap thickness minus ablation depth must be greater than or equal to 250 µm. (medscape.com)
Microincision1
- This dedicated diamond blade for corneal MICS allows me easy entrance into the eye, and the microincision remains watertight throughout the surgery. (crstoday.com)
Contrast Sensitivity1
- 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)
Patients4
- These stipulations include patients' prescription details, general health, and corneal consistency. (theeyeinstitute.com)
- Some patients might also experience abnormal healing of corneal flaps. (theeyeinstitute.com)
- Researchers have also noted a similar phenomenon of corneal stiffening in diabetic patients where additional tissue crosslinking is purported as a result of glycation. (reviewofoptometry.com)
- Patients wearing contact lenses should be made this test regularly to identify the corneal thinning caused by lens. (vision-al.com)
Protrusion1
- Progressive corneal thinning and associated protrusion. (aoa.org)
Stromal bed2
Conclusions1
- Conclusions: Genetic risk factors have a strong role in the severity of the FECD phenotype and corneal thickness. (elsevier.com)
Hysteresis3
- Given that both thickness and hysteresis are corneal factors, comparing their histories, uses and interaction provides some interesting insights into the nature and value of hysteresis. (reviewofophthalmology.com)
- Corneal hysteresis and corneal thickness share some interesting parallels. (reviewofophthalmology.com)
- In certain respects, our under-standing of corneal hysteresis has followed the same path as corneal thickness. (reviewofophthalmology.com)
Optical1
- It carries out instrumental diagnostic tests such asperimetry, corneal pachymetry, optical coherence tomography and fluorescein angiography. (hsantalucia.it)
Secondary1
- [3] Vision loss is secondary to corneal scarring or optic nerve damage, and often amblyopia in asymmetric or unilateral cases. (aao.org)
Tissue5
- Second, use of a cryolathe to freeze the corneal cap for precise lenticular reshaping of corneal tissue. (aao.org)
- In the mid-1980s, Swinger, Krumeich, and Cassiday developed a technique for removing corneal tissue without the cryolathe. (aao.org)
- The microkeratome was removed the corneal cap in a first pass, then the suction ring was changed to excise a free lenticle of tissue with a second pass. (aao.org)
- The sectioned tissue was stored, and at 24 and 48 hours, pachymetry was repeated. (elsevier.com)
- Pachymetry, cell density, and cell viability of sectioned tissue after 48 hours in storage were encouraging overall. (elsevier.com)
Specular microscopy1
- Specular microscopy and pachymetry were performed. (elsevier.com)
Prevalence1
- The prevalence of corneal opacity also increased with increasing concentration of total amines. (cdc.gov)
Microkeratome1
- First, a manually advancing electric microkeratome for creating a corneal cap. (aao.org)