Results 151 to 160 of about 828,745 (178)

Development of a program for toric intraocular lens calculation considering posterior corneal astigmatism, incision-induced posterior corneal astigmatism, and effective lens position

Graefe's Archive for Clinical and Experimental Ophthalmology, 2016
Background: To evaluate the toric intraocular lens (IOL) calculation considering posterior corneal astigmatism, incision-induced posterior corneal astigmatism, and effective lens position (ELP).
Youngsub Eom, Hyo Myung Kim, Dongok Ryu
exaly   +2 more sources

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Characterization of posterior corneal astigmatism in a population with keratoconus

Seminars in Ophthalmology, 2020
Background: The curvature of the anterior corneal surface is traditionally used as a surrogate to estimate corneal astigmatism. In recent years, increasing importance has been attributed to posterior corneal astigmatism as an indicator. Our aim is to characterize the posterior corneal surface in a population with keratoconus and investigate its ...
Raquel Esteves Marques, Paulo Silva Guerra   +1 more
exaly   +3 more sources

Measurements of Anterior and Posterior Corneal Curvatures with OCT and Scheimpflug Biometers in Patients with Low Total Corneal Astigmatism

Journal of Clinical Medicine, 2022
Background: Posterior keratometry measurements are evolving features of the optical biometers. The differences between devices have bigger impact for the low astigmatism values.
Andrzej Grzybowski, Maria Muzyka-Woźniak, Adam A Oleszko   +2 more
exaly   +2 more sources

Influence of Posterior Corneal Astigmatism on Total Corneal Astigmatism in Eyes With Keratoconus

Cornea, 2016
To measure posterior corneal astigmatism (PCA) and investigate its influence on total corneal astigmatism (TCA) in eyes with keratoconus.Keratometric astigmatism (KA), PCA, and TCA were investigated by means of a dual Scheimpflug analyzer in patients with keratoconus.
Giacomo, Savini, Kristian, Næser, Domenico, Schiano-Lomoriello, Alessandro, Mularoni   +3 more
openaire   +2 more sources

Influence of posterior corneal astigmatism on total corneal astigmatism in eyes with moderate to high astigmatism

Journal of Cataract and Refractive Surgery, 2014
To evaluate the influence of posterior corneal astigmatism on total corneal astigmatism in patients with 1.00 diopter (D) or more of corneal astigmatism.Private practice, Bologna, Italy.Prospective case series.Corneal astigmatism was measured using a Scheimpflug camera combined with a corneal topographer (Sirius).
Giacomo, Savini, Francesco, Versaci, Gabriele, Vestri, Pietro, Ducoli, Kristian, Næser   +4 more
openaire   +2 more sources

Posterior Corneal Surface Toricity and Total Corneal Astigmatism

Optometry and Vision Science, 1991
ABSTRACT: The influence of posterior corneal surface toricity upon total corneal astigmatism was investigated in 60 young subjects (mean age 22.04 ± 3.24 years). Both surfaces were found to be flatter horizontally than vertically.
M C, Dunne, J M, Royston, D A, Barnes
openaire   +2 more sources

Effects of Aging on Anterior and Posterior Corneal Astigmatism

Cornea, 2010
To evaluate age-related changes in astigmatism of both corneal surfaces and the whole cornea.The right eyes of 370 subjects were measured with a rotating Scheimpflug camera (Pentacam). Astigmatisms of the anterior and posterior corneal surfaces were determined. The total corneal astigmatism was derived using power vector summation and vergence tracing.
Jau-Der, Ho, Shiow-Wen, Liou, Ray Jui-Fang, Tsai, Ching-Yao, Tsai   +3 more
openaire   +2 more sources

The effect of posterior corneal flat meridian and astigmatism amount on the total corneal astigmatism estimated from anterior corneal measurements

Graefe's Archive for Clinical and Experimental Ophthalmology, 2014
To evaluate the effects of posterior corneal astigmatism and the absolute flat meridian difference between anterior and posterior corneal surfaces (AMDAnt-Post) on the estimation of total corneal astigmatism using anterior corneal measurements (simulated keratometry [K]).Ninety-nine eyes of 99 healthy participants were enrolled.
Youngsub Eom, Jong Suk Song, Su-Yeon Kang   +2 more
exaly   +3 more sources

Measurement of Posterior Corneal Astigmatism by the IOLMaster 700

Journal of Refractive Surgery, 2018
PURPOSE: To provide the first description of posterior corneal astigmatism as measured by the IOLMaster 700 (Carl Zeiss Meditec, Jena, Germany) and assess how its characteristics compare to previous measurements from other devices.
Benjamin R, LaHood, Michael, Goggin
openaire   +2 more sources

Distribution of the anterior, posterior, and total corneal astigmatism in healthy eyes

International Ophthalmology, 2017
To evaluate the magnitude and axis orientation of the anterior, posterior, and total corneal astigmatism in normal healthy eyes of an Iranian population.In a prospective cross-sectional study, ophthalmic and anterior segment parameters of 153 healthy eyes of 153 subjects were evaluated by Galilei dual Scheimpflug analyzer.
Mohammad Naderan, Vahid Ownagh, Sepehr Feizi   +2 more
exaly   +3 more sources