Results 181 to 190 of about 24,361 (241)
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Investigation of posterior corneal curvature in CL-induced corneal swelling
Contact Lens and Anterior Eye, 2009To evaluate Orbscan II measurements without contact lens (CL) removal to monitor in vivo posterior corneal curvature in CL (hypoxia)-induced corneal swelling during extended wear (EW).Orbscan II corneal topographer was used to measure posterior corneal curvature 1 week before CL wearing and during 1 week of EW.
Raul, Martin +2 more
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Postnatal Changes in Corneal Curvature
Optometry and Vision Science, 1976Corneal curvature was measured in 10 kittens from three litters and found to change significantly during postnatal development. From our data analysis, corneal curvature can be predicted from an animal's age and weight. To facilitate this prediciton for use in fitting contact lenses as occluders or diffusers in developmental studies, prediction ...
D, Smolen, R, Ball, J L, Zacks
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Effect of thermokeratoplasty on corneal curvature
Journal of Cataract and Refractive Surgery, 1990A cadaver eye model was used to evaluate and quantify the use of thermokeratoplasty for steepening the central cornea to correct hyperopia. Four groups of eye-bank eyes were treated with four separate surgical plans. Each plan involved the placement of controlled thermal burns (in the depths of the corneal stroma, using a cautery probe) applied in a ...
A C, Neumann +5 more
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Contact Lenses and Corneal Curvature Changes
American Journal of Ophthalmology, 1965Changes in the physical contour of the cornea with contact-lens wear have been recognized by several authors. " These changes can be divided into two major groups: (1) molding, defined as a passive change in the physical contour of the cornea associated with contact lens wear and (2) corneal edema manifested clinically by a corneal haze seen best by ...
J A, Pratt-Johnson, D M, Warner
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Changes in corneal curvature in accommodation
Journal of Cataract and Refractive Surgery, 2003To determine the changes in corneal curvature in accommodation.Department of Ophthalmology, St. Luke's International Hospital, Tokyo, Japan.Twenty-eight eyes of 14 healthy volunteers with a mean age of 38.9 years (range 28 to 65 years) were enrolled in this prospective study. Corneal topographies were taken before and during accommodation.
Akihiro, Yasuda +2 more
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ODE/PDE analysis of corneal curvature
Computers in Biology and Medicine, 2014The starting point for this paper is a nonlinear, two-point boundary value ordinary differential equation (BVODE) that defines corneal curvature according to a static force balance. A numerical solution to the BVODE is computed by first converting the BVODE to a parabolic partial differential equation (PDE) by adding an initial value (t, pseudo-time ...
Łukasz Płociniczak +2 more
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Corneal curvature and thickness – Scheimpflug
Acta Ophthalmologica, 2022AbstractAlthough the Scheimpflug principle was first described over a century ago, the clinical use of Scheimpflug camera in anterior segment imaging started only a decade ago. Scheimpflug imaging has since advanced significantly and modern instruments provide comprehensive imaging and topographic data of the anterior segment using a noncontact method.
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Longitudinal Changes in Corneal Curvature in Keratoconus
Cornea, 2006This study was designed to identify factors that predict longitudinal increases in corneal curvature as measured by the First Definite Apical Clearance Lens (FDACL) and flatter keratometric reading (Flat K) in keratoconus.The Collaborative Longitudinal Evaluation of Keratoconus (CLEK) Study is a long-te rm evaluation of the natural history of ...
Timothy T, McMahon +5 more
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Changes in corneal curvature following ocular convergence
Vision Research, 1965Abstract A method is described for the measurement of the radii of corneal curvature in the vertical and horizontal meridians. It was applied to the study of the change in curvature during the convergence of the ocular axes from an approximately primary position to a binocular fixation spot situated at some 5 metre-angles: (a) the eye under test ...
B, Löpping, R A, Weale
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Corneal Curvature Stability With Increased Intraocular Pressure
Eye & Contact Lens: Science & Clinical Practice, 2007To examine the corneal shape and ocular refraction under conditions of increased intraocular pressure (IOP) and to consider the possible influences of direct digital forces, corneal thickness, limbal and scleral rigidity, and the duration and frequency of IOP loading on the results.Forces applied digitally to the temporal sclera were used to obtain 15 ...
Charles W, McMonnies, Gavin C, Boneham
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