Results 31 to 40 of about 60,803 (278)

Screen Exposure during Early Life and the Increased Risk of Astigmatism among Preschool Children: Findings from Longhua Child Cohort Study

International Journal of Environmental Research and Public Health, 2020
Screen media usage has become increasingly prevalent in daily life with children being exposed to screens at an early age. This is a growing public health concern with evidence linking screen exposure to detrimental health outcomes, whereas relationship ...
Lihua Huang, Gui-You Yang, K. Schmid, Jing-Yi Chen, Chen-Guang Li, G. He, Zengliang Ruan, Wei-Qing Chen   +7 more
semanticscholar   +1 more source

Toric intraocular lens versus limbal relaxing incisions for corneal astigmatism after phacoemulsification.

Cochrane Database of Systematic Reviews, 2019
BACKGROUND Cataract is the leading cause of blindness in the world, and clinically significant astigmatism may affect up to approximately 20% of people undergoing cataract surgery.
J. Lake, Gustavo Victor, G. Clare, Gustavo J M Porfírio, Ashleigh Kernohan, J. Evans   +5 more
semanticscholar   +1 more source

Corneal Elevation, Power, and Astigmatism to Assess Toric Orthokeratology Lenses in Moderate-to-High Astigmats.

Eye & contact lens, 2020
OBJECTIVES Fitting philosophies for toric orthokeratology are based on elevation or corneal astigmatism, but it is unclear which is more effective.
Erin S Tomiyama, Anna-Kaye M Logan, K. Richdale   +2 more
semanticscholar   +1 more source

Astigmatism correction and quality optimization of computer-generated holograms for holographic waveguide displays.

Optics Express, 2020
In this manuscript, the astigmatism of the waveguide combiner with a pair of symmetry HOEs was analyzed. The light field can be predicted by the modified convolution formulation of Fresnel diffraction when the information of light passes through the ...
W. Lin, O. Matoba, Bor-Shyh Lin, Wei-Chia Su   +3 more
semanticscholar   +1 more source

Study of Prevalence of Preoperative Corneal Astigmatism in Patients with Senile Cataract at a Tertiary Care Institute in South India

Journal of Ophthalmology, 2022
Background. The prevalence of corneal astigmatism in patients with cataract has not been well documented in both rural and urban areas of Indian population. Purpose. The aim of this study was to assess prevalence of corneal astigmatism before cataract
C. Kumar Amruth, P. Ramya Deepthi, K. Sushma   +2 more
doaj   +1 more source

Contribution of Posterior Corneal Astigmatism to Total Corneal Astigmatism in a Sample of Egyptian Population

Clinical Ophthalmology, 2020
Mohamed Hosny, Alaa Badawy, Lobna Khazbak, Mohamed Anis, Sarah Azzam Ophthalmology, Cairo University, Giza, EgyptCorrespondence: Mohamed HosnyOphthalmology, Cairo University, 84 Shehab Street, Mohandeseen, Giza 12411, EgyptTel +20 1000007675Email ...
Hosny M, Badawy A, Khazbak L, Anis M, Azzam S   +4 more
doaj  

Age- and gender-related characteristics of astigmatism in a myopic population

Frontiers in Medicine, 2022
PurposeTo explore age- and gender-related differences of refractive and corneal astigmatism in myopic patients looking for refractive surgery.DesignA retrospective cross-sectional study.Materials and methodsThe medical files of candidates looking for ...
Shan Yang, Yang Jiang, Ge Cui, Ying Li
doaj   +1 more source

Corneal Astigmatism Measurements Comparison among Ray-Tracing Aberrometry, Partial Coherence Interferometry, and Scheimpflug Imaging System

Journal of Ophthalmology, 2020
Purpose. To investigate interdevice agreement among corneal topography/ray-tracing aberrometry (iTrace), partial coherence interferometry (IOLMaster), and Scheimpflug imaging (Pentacam) for the measurement of corneal astigmatism. Methods.
Yaqin Zhang, Jing Dong, Suhua Zhang, Bin Sun, Xiaoliang Wang, Maolong Tang, Xiaogang Wang   +6 more
doaj   +1 more source

Long-term outcomes of cataract surgery with toric intraocular lens implantation by the type of preoperative astigmatism

Scientific Reports, 2022
Surgical outcomes of toric intraocular lens (IOL) implantation for 8 years after surgery were analyzed. Data were retrospectively collected in 176 eyes of 176 patients before and 1 month, 1, 3, 5, and 8 years after phacoemulsification and implantation of
Tetsuro Oshika, Shinichiro Nakano, Yoshifumi Fujita, Yuya Nomura, Yasushi Inoue, Hiroyasu Takehara, Kazunori Miyata, Masato Honbou, Toru Sugita, Tsutomu Kaneko   +9 more
doaj   +1 more source

Primary Topography-Guided LASIK: Treating Manifest Refractive Astigmatism Versus Topography-Measured Anterior Corneal Astigmatism.

Journal of refractive surgery, 2019
PURPOSE To investigate whether topography-guided laser in situ keratomileusis (LASIK) with anterior corneal astigmatism measured on the WaveLight Contoura (Alcon Laboratories, Inc., Fort Worth, TX) leads to better refractive outcomes compared to treating
Avi Wallerstein, Mathieu Gauvin, S. R. Qi, M. Bashour, Mark Cohen   +4 more
semanticscholar   +1 more source