Results 11 to 20 of about 828,745 (178)

Distribution of posterior corneal astigmatism according to axis orientation of anterior corneal astigmatism. [PDF]

PLoS ONE, 2015
To investigate the distribution of posterior corneal astigmatism in eyes with with-the-rule (WTR) and against-the-rule (ATR) anterior corneal astigmatism.We retrospectively examined six hundred eight eyes of 608 healthy subjects (275 men and 333 women ...
Toshiyuki Miyake, Kimiya Shimizu, Kazutaka Kamiya   +2 more
doaj   +5 more sources

Studying the contribution of posterior corneal astigmatism to total corneal astigmatism

Journal of the Egyptian Ophthalmological Society, 2015
Settings The Faculty of Medicine, Alexandria University, Egypt. Purpose The aim of this work was to study the contribution of posterior corneal astigmatism to total corneal astigmatism.
Hany Ahmed Helaly
doaj   +3 more sources

Anterior and Posterior Corneal Astigmatism after Refractive Lenticule Extraction for Myopic Astigmatism [PDF]

Journal of Ophthalmology, 2015
Purpose. To assess the amount and the axis orientation of anterior and posterior corneal astigmatism after refractive lenticule extraction (ReLEx) for myopic astigmatism. Methods. We retrospectively examined 53 eyes of 53 consecutive patients (mean age ±
Kazutaka Kamiya, Kimiya Shimizu, Mayumi Yamagishi, Akihito Igarashi, Hidenaga Kobashi   +4 more
doaj   +5 more sources

Accuracy of Toric Intraocular Lens Calculators with Predicted and Measured Posterior Corneal Astigmatism Across Different Types of Astigmatism [PDF]

Ophthalmology and Therapy
Introduction This study is a retrospective case series to compare the accuracy of the Barrett toric calculator using predicted posterior corneal astigmatism (PCA) and PCA measurements using swept-source optical coherence tomography (SS-OCT) and a ...
Hyun Seung Kim, So-Hyang Chung, Yong-Soo Byun   +2 more
exaly   +3 more sources

Leftover Astigmatism: The Missing Link Between Measured and Calculated Posterior Corneal Astigmatism

Journal of Refractive Surgery, 2022
PURPOSE: To quantify the total eye astigmatism that is not accounted for by measurement of anterior corneal astigmatism and posterior corneal astigmatism and knowledge of intraocular lens (IOL) astigmatism and assess whether it is correlated with candidate sources of or correlates with leftover astigmatism.
Goggin, Michael, LaHood, Benjamin R., Roggia, Murilo F., Chen, Tony S., Beheregaray, Simone, Esterman, Adrian   +5 more
openaire   +4 more sources

Posterior Corneal Characteristics of Cataract Patients with High Myopia.

PLoS ONE, 2016
PurposeTo evaluate the characteristics of the posterior corneal surface in patients with high myopia before cataract surgery.MethodsWe performed a cross-sectional study at the Eye and ENT Hospital of Fudan University, Shanghai, China. Corneal astigmatism
Qinghe Jing, Yating Tang, Dongjin Qian, Yi Lu, Yongxiang Jiang   +4 more
doaj   +2 more sources

Changes in Anterior, Posterior, and Total Corneal Astigmatism after Descemet Membrane Endothelial Keratoplasty

Journal of Ophthalmology, 2017
Purpose. To evaluate changes in anterior, posterior, and total corneal astigmatism in patients after Descemet membrane endothelial keratoplasty (DMEK). Methods. We retrospectively included 29 eyes of 23 patients (age 67.6 ± 9.8 years, 13 female, 10 male)
Maged Alnawaiseh, Lars Zumhagen, André Rosentreter, Nicole Eter   +3 more
doaj   +2 more sources

Mean posterior corneal power and astigmatism in normal versus keratoconic eyes

Journal of Ophthalmic & Vision Research, 2018
Purpose: To compare mean posterior corneal power and astigmatism in normal versus keratoconus affected eyes and determine the optimal cut-off points to maximize sensitivity and specificity in discriminating keratoconus from normal corneas.
Sepehr Feizi, Siamak Delfazayebaher, Mohammad Ali Javadi, Farid Karimian, Vahid Ownagh, Fatemeh Sadeghpour   +5 more
doaj   +2 more sources

Evaluation of posterior and total corneal astigmatism with colour-LED topography

Eye, 2020
To characterise the posterior and total corneal astigmatism using colour point-source light-emitting diodes (LED) topography.In a prospective case series 400 eyes from 400 patients were evaluated by colour-LED topography. Only eyes with normal topographies were considered.
Mendes, João, Ribeiro, Filomena, Ferreira, Tiago B.   +2 more
openaire   +4 more sources

Posterior Corneal Asphericity Effect on Postoperative Astigmatism after EDOF Intraocular Lens Implantation in Cataract Patients

Journal of Ophthalmology, 2021
Aim. To assess the impact of posterior corneal asphericity on postoperative astigmatism. Methods. We included retrospectively 70 eyes of 70 patients that underwent cataract surgery.
Mark Rabinovich, Ivo Guber, Laëtitia Jessy Niegowski, Ana Maria Aramburu del Boz, Danial Al Khatib, Jean-Pascal Genestier, Jerome Bovet   +6 more
doaj   +2 more sources