Results 191 to 200 of about 24,361 (241)
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POSITION AND CURVATURE OF THE CORNEAL APEX
Optometry and Vision Science, 1969Methods to measure the position of the corneal apex are reviewed and evaluated. The recommended method is with a small-mire keratometer that has a target mounted independently of the drum. The corneal apexes for eight subjects were found to be decentered from their lines of sight but a directional trend was not apparent.
R B, Mandell, R, St Helen
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Corneal curvature and trachoma.
Annals of ophthalmology, 1984In a study of 141 cases in different stages of trachoma, a definite change was observed in the curvature of upper part of cornea, which had become ectatic. The difference in curvature depended on the stage and severity of the trachoma. Most of the patients had fourth stage trachoma.
R P, Bhatia, P, Awasthy
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Posterior corneal curvature and its influence on corneal dioptric power
Acta Ophthalmologica, 1994Abstract. An algorithm for estimation of the posterior corneal curvature is presented and applied on data from normal and keratoconic eyes. Radius of central posterior corneal curvature are demonstrated to be (mean ± sd) 6.71 ± 0.23 mm and 5.58 ± 0.78 mm in normals and keratoconic eyes, respectively.
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Polynomial Approximations of Corneal Surfaces And Corneal Curvature Topography
Ophthalmic and Visual Optics, 1992Machines for the measurement of corneal topography typically produce a colored topographic map of the mean curvature of the cornea. (1). From the examination of a number of such maps of normal corneas it has been found that the normal cornea is most curved at its apex and flatter in the periphery. By contrast, a cornea flattened by corneal surgery will
H. C. Howland, A. Glasser, R. Applegate
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[Corneal curvature of myopia].
Nippon Ganka Gakkai zasshi, 1993We classified myopia by total refractive error, measured the corneal curvature, and analyzed the relationship between the diopter value and corneal curvature in growing teen-agers and in adults in their twenties, whose myopic progress is presumed to have stopped. We adopted as the harmonic average the central 3.0 mm of the cornea.
H, Yamaguchi +4 more
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Central corneal thickness and corneal curvature in patients with rheumatoid arthritis
International Ophthalmology, 2016The aims of this study were to determine the central corneal thickness (CCT) and corneal curvature (CC) in patients with rheumatoid arthritis (RA), and to evaluate the correlations between the CCT, CC, RA activity, and RA duration. Fifty-four RA patients (104 eyes; 35 with dry eye, 69 without dry eye) and 21 age- and gender-matched control patients (42
Özcura, Fatih +4 more
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The effect of corneal thickness and corneal curvature on pneumatonometer measurements
Current Eye Research, 2002The purpose of this study was to investigate the influence of corneal topography and thickness on intraocular pressure (IOP) and pulse amplitude (PA) as measured using the Ocular Blood Flow Analyzer (OBFA) pneumatonometer (Paradigm Medical Industries, Utah, USA).47 university students volunteered for this cross-sectional study: mean age 20.4 yrs, range
Andrew J, Morgan +3 more
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Corneal curvature and central corneal thickness in eyes with pseudoexfoliation syndrome
Canadian Journal of Ophthalmology, 2007Previous studies have reported different central corneal thickness (CCT) values in eyes with pseudoexfoliation syndrome (PXS). There has been no report about corneal curvature (CC) in PXS eyes. The aim of this study was to investigate the CCT together with the CC in PXS eyes with and without glaucoma.The CC (simulated keratometry 1 [SimK1], SimK2, and ...
Ibrahim F, Hepsen +2 more
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CORNEAL CURVATURE EROM PROFILE MEASUREMENTS*
The Australian Journal of Optometry, 1971The determination of corneal curvature from profile photographs has received scant attention in the past history of research into corneal topography. This paper describes the principal elements of experimental procedures involved in profile measurements and summarizes some experimental work being undertaken to eliminate the validity and potential of ...
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Local Steepening in Peripheral Corneal Curvature After Corneal Refractive Therapy and LASIK
Optometry and Vision Science, 2010The purpose of this study was to assess the changes in curvature along the horizontal meridian of the anterior cornea occurring after refractive surgery and corneal refractive therapy (CRT).One hundred twenty-two eyes of 122 patients (70 female) with a mean (SD) age of 30.6 +/- 7.5 years were retrospectively analyzed in this study. Forty-three of those
Queirós, A. +4 more
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