Results 161 to 170 of about 828,745 (178)
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Agreement Between Internal Astigmatism and Posterior Corneal Astigmatism in Pseudophakic Eyes
Journal of Refractive Surgery, 2018PURPOSE: To directly measure internal astigmatism and evaluate its agreement with posterior corneal astigmatism in pseudophakic eyes. METHODS: This prospective study enrolled 32 eyes of 32 patients (18 women, 56.3%) who underwent phacoemulsification with implantation of a non-toric ...
Sepehr, Feizi +2 more
openaire +2 more sources
Correcting astigmatism with toric intraocular lenses: Effect of posterior corneal astigmatism
Journal of Cataract and Refractive Surgery, 2013To evaluate the impact of posterior corneal astigmatism on outcomes with toric intraocular lenses (IOLs).Cullen Eye Institute, Baylor College of Medicine, Houston, Texas, USA.Case series.Corneal astigmatism was measured using 5 devices before and 3 weeks after cataract surgery.
Douglas D, Koch +4 more
openaire +2 more sources
Vector summation of anterior and posterior corneal topographical astigmatism
Journal of Cataract and Refractive Surgery, 2002To determine whether vector addition of posterior corneal astigmatism improves the correlation between topographical and refractive astigmatism.Massachusetts Eye and Ear Infirmary and Harvard Medical School, Boston, Massachusetts, USA.Orbscan topographical maps of 40 eyes (31 patients) showing 1.0 to 6.0 diopters (D) of astigmatism were analyzed ...
Olivier, Prisant +6 more
openaire +2 more sources
Accuracy of Corneal Astigmatism Estimation by Neglecting the Posterior Corneal Surface Measurement
American Journal of Ophthalmology, 2009To evaluate the accuracy of corneal astigmatism estimation by neglecting the posterior corneal surface measurement.Prospective, observational study.The right eyes of 493 subjects were measured with a rotating Scheimpflug camera (Pentacam; Oculus, Wetzlar, Germany).
Jau-Der, Ho +2 more
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Distribution of Anterior and Posterior Corneal Astigmatism in Eyes With Keratoconus
American Journal of Ophthalmology, 2016To investigate the magnitude, with-the-rule (WTR) or against-the-rule (ATR) orientation, and vector components (Jackson astigmatic vectors [J0 and J45] and blurring strength) of the anterior and posterior corneal astigmatism (ACA and PCA) in patients with keratoconus (KC) in a retrospective study, and to try to find suitable cutoff points for ACA and ...
Mohammad Naderan +2 more
openaire +2 more sources
Toric IOL Calculation in Eyes With High Posterior Corneal Astigmatism
Journal of Refractive Surgery, 2020PURPOSE: To evaluate different calculation approaches for toric intraocular lens (IOL) calculation in cases with high posterior corneal astigmatism (PCA). METHODS: Consecutive patients who underwent cataract extraction with implantation of toric IOLs by a single surgeon were ...
Olga, Reitblat +4 more
openaire +2 more sources
Age-Related Changes in Anterior, Posterior, and Total Corneal Astigmatism
Journal of Refractive Surgery, 2014PURPOSE: To evaluate age-related changes in anterior, posterior, and total corneal astigmatism by comparing simulated keratometric astigmatism to total corneal astigmatism. METHODS: Corneal topography of the anterior and posterior surfaces was evaluated using three-dimensional ...
Yuta, Ueno +5 more
openaire +2 more sources
Total Corneal Astigmatism and Posterior Corneal Surface
Journal of Refractive Surgery, 2015Virgilio, Galvis +3 more
openaire +4 more sources
Faculty Opinions – Post-Publication Peer Review of the Biomedical Literature, 2013
George O Waring IV +2 more
+4 more sources
George O Waring IV +2 more
+4 more sources