Results 21 to 30 of about 61,783 (227)

Eyelid squinting improves near vision in against-the-rule and distance vision in with-the-rule astigmatism in pseudophakic eyes: an eye model experimental study

BMC Ophthalmology, 2020
Background To elucidate whether eyelid squinting improves near and distance vision in against-the-rule (ATR) and with-the-rule (WTR) simple myopic astigmatism in pseudophakic eyes. Methods A refraction-model eye was mounted on a wavefront analyzer.
Jay Won Rhim, Youngsub Eom, Seo Yeon Park, Su-Yeon Kang, Jong Suk Song, Hyo Myung Kim   +5 more
doaj   +1 more source

Modeling low order aberrations in laser guide star adaptive optics systems [PDF]

, 2007
When using a laser guide star (LGS) adaptive optics (AO) system, quasi-static aberrations are observed between the measured wavefronts from the LGS wavefront sensor (WFS) and the natural guide star (NGS) WFS.
Bouchez, Antonin H., Clare, Richard M., van Dam, Marcos A.   +2 more
core   +1 more source

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   +1 more source

Postoperative Corneal and Surgically Induced Astigmatism following Superior Approach Manual Small Incision Cataract Surgery in Patients with Preoperative Against-the-Rule Astigmatism

Journal of Ophthalmology, 2016
The aim of the study was to report postoperative corneal and surgically induced astigmatism (SIA) in patients with preoperative against-the-rule (ATR) astigmatism who underwent superior approach manual small incision cataract surgery (MSICS).
Edmund Arthur, Ahmed Abdul Sadik, David Ben Kumah, Eugene Appenteng Osae, Felix Agyemang Mireku, Frank Yeboah Asiedu, Reynolds Kwame Ablordeppey   +6 more
doaj   +1 more source

Femtosecond astigmatic keratotomy for postkeratoplasty astigmatism

Saudi Journal of Ophthalmology, 2016
To evaluate the initial outcomes of femtosecond laser arcuate keratotomies (AK) to correct high astigmatism after keratoplasty.This retrospective non-comparative interventional study included 52 consecutive patients (52 eyes) who underwent Intralase-enabled arcuate keratotomies.
Al Sabaani, Nasser, Al Malki, Salem, Al Jindan, Mohanna, Al Assiri, Abdullah, Al Swailem, Samar   +4 more
openaire   +2 more sources

Proto-Model of an Infrared Wide-Field Off-Axis Telescope [PDF]

, 2010
We develop a proto-model of an off-axis reflective telescope for infrared wide-field observations based on the design of Schwarzschild-Chang type telescope.
Chang, Seunghyuk, Kim, Geon Hee, Kim, Myung Sang, Kim, Sanghyuk, Lee, Hanshin, Lee, Sungho, Pak, Soojong, Yang, Sun Choel   +7 more
core   +1 more source

Refractive change following pseudophakic vitrectomy: a retrospective review [PDF]

, 2008
Background To assess the occurrence and magnitude of refractive change in pseudophakic eyes undergoing 20 gauge pars plana vitrectomy without scleral buckling and to investigate possible aetiological factors.
Anthony Hildreth, CY Hu, David HW Steel, James Ng, JB Randleman, Jean-Pierre Danjoux, JR McEwan, JW Jeoung, L Zheng, M Shioya, O Cekic, O Findl, P Brazitikos, RV Campo, S Cisiecki, Sinead Byrne, T Eckert, T Oshika, Y Suzuki, YR Sharma   +19 more
core   +5 more sources

Effect of femtosecond laser-assisted steepest-meridian clear corneal incisions on preexisting corneal regular astigmatism at the time of cataract surgery [PDF]

International Journal of Ophthalmology, 2020
AIM: To investigate the clinical efficacy and safety of femtosecond laser-assisted steepest-meridian clear corneal incisions for correcting preexisting corneal astigmatism performed at the time of cataract surgery.
Wei Chen, Min Ji, Jian Wu, Yong Wang, Jing Zhou, Rong-Rong Zhu, Hong Lu, Huai-Jin Guan   +7 more
doaj   +1 more source

Near visual function measured with a novel tablet application in patients with astigmatism

Clinical and Experimental Optometry, EarlyView., 2020
Clinical relevance While the clinical focus of performance metrics is traditionally based on visual acuity, research from the field of visual impairment has demonstrated that metrics such as reading speed and critical print size correlate much more strongly with subjective patient reported outcomes and assessed ability in real‐world tasks.
Ananya Datta, Kathryn Richdale, Erin S Tomiyama, Chuan Hu, Anna‐Kaye M Logan, Kelsea Skidmore, Moriah A Chandler, Eric R Ritchey, James S Wolffsohn   +8 more
wiley   +1 more source

Prevalence of and factors associated with astigmatism in preschool children in Wuxi City, China

BMC Ophthalmology, 2022
Purpose To investigate the status of astigmatism in preschool children in Wuxi City, and explore the risk factors related to astigmatism. The risk factors related to astigmatism development as predictors can help us identify preschool children who need ...
Zhihui Yang, Zijing Lu, Yihui Shen, Ting Chu, Xubin Pan, Cun Wang, Jihong Wang   +6 more
doaj   +1 more source