Results 41 to 50 of about 4,423 (126)

The contribution of posterior corneal astigmatism to ocular residual astigmatism

Abstract Objectives To determine the main sources of ocular residual astigmatism (ORA) and the contribution of posterior corneal astigmatism (PCA) to ORA. Methods This cross-sectional study was conducted on 177 right eyes of 177 patients. Anterior corneal astigmatism (ACA) and PCA were obtained from Pentacam.
Dongmei Yan, Jian Lin, Dexiang An, Haiqian Wu, Yun Lu   +4 more
openaire   +1 more source

Keratometry device for surgical support

BioMedical Engineering OnLine, 2009
Background High astigmatisms are usually induced during corneal suturing subsequent to tissue transplantation or any other surgery which involves corneal suturing.
Saia Paula, De Groote Jean-Jacques, Ventura Liliane, Faria e Sousa Sidney J   +3 more
doaj   +1 more source

Approximately half of the magnitude of ocular residual astigmatism comes from posterior corneal astigmatism in myopic patients aged 18-40 years

, 2023
Abstract To determine the main sources of ocular residual astigmatism (ORA) and the contribution of posterior corneal astigmatism (PCA) to ORA. Anterior corneal astigmatism (ACA) and PCA was obtained from Pentacam. ORA was calculated by Thibos vector analysis.
Jian Lin, Dexiang An, Haiqian Wu, Yun Lu, Dongmei Yan   +4 more
openaire   +1 more source

WaveLight® Contoura topography-guided planning: contribution of anterior corneal higher-order aberrations and posterior corneal astigmatism to manifest refractive astigmatism

Clinical Ophthalmology, 2018
Avi Wallerstein,1,2 Mathieu Gauvin,1,2 Mark Cohen2,3 1Department of Ophthalmology, Faculty of Medicine, McGill University, Montreal, QC, Canada; 2LASIK MD, Montreal, QC, Canada; 3Department of Surgery, Faculty of Medicine and Health Sciences, University
Wallerstein A, Gauvin M, Cohen M
doaj  

Refractive, corneal, and ocular residual astigmatism: distribution in a German population and age dependency—the Gutenberg Health Study

Graefe's Archive for Clinical and Experimental Ophthalmology, 2017
Worldwide, the most frequent cause of visual impairment is uncorrected refractive error. This analysis focused on the distribution and associations of refractive, corneal and ocular residual astigmatism.As part of the Gutenberg Health study, a population-based cross-sectional study was conducted in the general population of Germany.
Schuster, Alexander Karl-Georg, Pfeiffer, Norbert, Schulz, Andreas, Höhn, René Gerhard Joachim, Ponto, Katharina A, Wild, Philipp S, Blettner, Maria, Beutel, Manfred E, Lackner, Karl J, Münzel, Thomas, Mirshahi, Alireza   +10 more
openaire   +6 more sources

Visual outcome and rotational stability of open loop toric intraocular lens implantation in Indian eyes

Indian Journal of Ophthalmology, 2013
Purpose: To assess the visual outcome and rotational stability of single-piece open loop toric Intra Ocular Lens (IOL) in a clinical setting. Materials and Methods: In a prospective study, 122 eyes of 77 patients were followed up for a period of 12 ...
Arvind Venkataraman, Kalpana
doaj   +1 more source

The Incidence of Posterior Ocular Astigmatism in a Refractive Surgery Population as Determined by the Direct Reduction of Topography Measured Astigmatism

Clinical Ophthalmology
Manoj Motwani, Lourdes Haydaw Cornea Revolution/Motwani, LASIK Institute, San Diego, CA, 92121, USACorrespondence: Manoj Motwani, Cornea Revolution/Motwani, LASIK Institute, 9710 Scranton Road, Ste 170, San Diego, CA, 92121, USA, Tel +1 858 554-0008 ...
Motwani M, Haydaw L
doaj  

The Long-term observation of the quick contrast sensitivity and its influencing factors after SMILE

Photodiagnosis and Photodynamic Therapy
Purpose: This study investigates the long-term impact of Small Incision Lenticule Extraction (SMILE) on quantitative contrast sensitivity (qCSF) and its determinants. Materials and Methods: The research involved 80 eyes (mean spherical equivalent -6.10±1.
Weijung Ten, Yangyi Huang, Yiyong Xian, Yuhao Ye, Xingtao Zhou, Jing Zhao   +5 more
doaj   +1 more source

Assessment of the corneal high-order aberration changes after pterygium surgery

Therapeutic Advances in Ophthalmology
Purpose: Corneal high-order aberrations due to pterygium have a significant impact on patients’ visual quality. This study aims to assess changes in corneal high-order aberrations following pterygium surgery.
Anjana Sapkota, Meenu Chaudhary, Sanjeeta Sitaula, Pragati Gautam   +3 more
doaj   +1 more source

Comparing Visual Acuity, Low Contrast Acuity and Refractive Error After Implantation of a Low Cylinder Power Toric Intraocular Lens or a Non-Toric Intraocular Lens

Clinical Ophthalmology, 2020
Kjell Gunnar Gundersen,1 Richard Potvin2 1iFocus Øyeklinikk AS, Haugesund, Norway; 2Science in Vision, Bend, OR, USACorrespondence: Kjell Gunnar GunderseniFocus Øyeklinikk AS, Sørhauggata 111, Haugesund 5527, NorwayTel +47 ...
Gundersen KG, Potvin R
doaj