Results 161 to 170 of about 7,377 (209)

Simultaneous Estimation of Corneal Topography, Pachymetry, and Curvature

IEEE Transactions on Medical Imaging, 2018
Identification of objective criteria to correctly diagnose ectatic diseases of the cornea or to detect early stages of corneal ectasia is of great interest in ophthalmology and optometry. Metrics for diagnosis typically employed are curvature maps (axial/sagittal, tangential); elevation map of the anterior surface of the cornea with respect to a ...
Farzana Nasrin, Ram V. Iyer, Steven M. Mathews   +2 more
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Measuring Central Corneal Thickness with Ultrasound Pachymetry

Optometry and Vision Science, 2003
ABSTRACT: Purpose. To determine how many ultrasound pachymetry measurements are required to obtain a reasonable estimate of central corneal thickness. Methods. Five central corneal thickness measurements were obtained
Tony, Realini, Kim, Lovelace
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Corneal thickness measured by ultrasonic pachymetry in cats

American Journal of Veterinary Research, 1993
SUMMARY Ultrasonic pachymetry was used to measure central superior peripheral, and temporal peripheral corneal thickness of 35 cats (70 eyes) with normal corneas, anterior chambers, and intraocular pressures. Mean central corneal thickness for both eyes in 3 locations for 35 cats was 578 ± 64 µm.
B C, Gilger, J C, Wright, R D, Whitley, S A, McLaughlin   +3 more
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Comparison of Central Corneal Thickness Measurements by Ultrasound Pachymetry, Konan Noncontact Optical Pachymetry, and Orbscan Pachymetry

Cornea, 2008
To assess the repeatability of two optical techniques for measurement of central corneal thickness and to compare the validity of these techniques with standard ultrasound pachymetry.Corneal thickness was measured twice with Konan optical pachymetry, Orbscan optical pachymetry, and 3 times by conventional ultrasound pachymetry in 100 eyes of 50 healthy
Amarilda, Christensen, Julio, Narváez, Grenith, Zimmerman   +2 more
openaire   +2 more sources

Comparison of Four Corneal Pachymetry Techniques in Corneal Refractive Surgery

Journal of Refractive Surgery, 2004
ABSTRACT PURPOSE: To assess the effectiveness of optical and ultrasonic pachymetry when examining corneas of patients before and after laser in situ keratomileusis (LASIK). METHODS: We conducted a prospective study of 25 patients (50 eyes) who had LASIK for myopia or myopic astigmatism (mean spherical equivalent refraction -4.80 ± 3.
Jaime, Javaloy, Maria Teresa, Vidal, Jose R, Villada, Alberto, Artola, Jorge L, Alió   +4 more
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Corneal topography pachymetry

1997
For refractive surgical procedures and medical therapy a correct assessment of corneal thickness is crucial. We conducted corneal ultrasound pachymetry in 200 eyes, and found that the peripheral thickness was significantly greater than central thickness (0.669 versus 0.54 mm). The thinnest point was below the center.
U. Fries, C. Ohrloff, R. Makabe
openaire   +1 more source

Corneal densitometry and its correlation with age, pachymetry, corneal curvature, and refraction

International Ophthalmology, 2016
To determine normative corneal densitometry values in relation to age, sex, refractive error, corneal thickness, and keratometry, measured using the Oculus Pentacam system.Three hundred and thirty-eight healthy subjects (185 men; 153 women) with no corneal disease underwent an exhaustive ocular examination.
Nuria, Garzón, Francisco, Poyales, Igor, Illarramendi, Javier, Mendicute, Óscar, Jáñez, Pedro, Caro, Alfredo, López, Francisco, Argüeso   +7 more
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Correlations between corneal hysteresis, intraocular pressure, and corneal central pachymetry

Journal of Cataract and Refractive Surgery, 2008
To analyze the correlation between corneal hysteresis (CH) measured with the Ocular Response Analyzer (ORA, Reichert) and ultrasonic corneal central thickness (CCT US) and intraocular pressure measured with Goldmann applanation tonometry (IOP GA).Bordeaux 2 University, Ophthalmology Department, Bordeaux, France.This study comprised 498 eyes of 258 ...
David, Touboul, Cynthia, Roberts, Julien, Kérautret, Caroline, Garra, Sylvie, Maurice-Tison, Elodie, Saubusse, Joseph, Colin   +6 more
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Corneal pachymetry in normal and keratoconic eyes

Journal of Cataract and Refractive Surgery, 2004
To compare corneal thickness measurements using Orbscan II (OII) and ultrasonic (US) pachymetry in normal and in keratoconic eyes.Eye Department, Heartlands and Solihull NHS Trust, Birmingham, United Kingdom.Central corneal thickness (CCT) was measured by means of OII and US pachymetry in 1 eye of 72 normal subjects and 36 keratoconus patients.
D, Gherghel, S L, Hosking, S, Mantry, S, Banerjee, S A, Naroo, S, Shah   +5 more
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Correction Factor in Orbscan II in the Assessment of Corneal Pachymetry

Cornea, 2006
Comparison of corneal pachymetry assessment with ultrasound and Orbscan II using acoustic factor and subtraction methods.Ultrasound and Orbscan pachymetry for all patients with LASIK performed between July 2002 and May 2003 were retrospectively analyzed. Comparison between the 2 preoperative measurements was analyzed.Using a custom acoustic factor of 0.
Arthur C K, Cheng, Emily, Tang, Shaheeda, Mohamed, Dennis S C, Lam   +3 more
openaire   +2 more sources