Results 31 to 40 of about 61,280 (177)

Goos-H\"anchen and Imbert-Fedorov shifts for astigmatic Gaussian beams

, 2015
In this work we investigate the role of the beam astigmatism in the Goos-H\"anchen and Imbert-Fedorov shift. As a case study, we consider a Gaussian beam focused by an astigmatic lens and we calculate explicitly the corrections to the standard formulas ...
Aiello, Andrea, Ornigotti, Marco
core   +1 more source

Changes in astigmatism after horizontal muscle recession strabismus surgery: A retrospective cohort study

Indian Journal of Ophthalmology, 2021
Purpose: The aim of this study was to evaluate the changes in astigmatism after unilateral recession of horizontal rectus muscles in pediatric patients.
Christina Karakosta, Konstantinos I Bougioukas, Martha Karra, Georgios Kontopanos, Georgios Methenitis, Maria Liaskou, Konstantinos Paraskevopoulos, Anna Kokolaki   +7 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  

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

Comparison of penetrating femtosecond laser-assisted astigmatic keratotomy and toric intraocular lens implantation for correction of astigmatism in cataract surgery

Scientific Reports, 2021
This study tried to compare the clinical outcomes of femtosecond laser-assisted astigmatic keratotomy (FSAK) and toric intraocular lens (IOL) implantation for astigmatism correction and identify factors affecting the efficacy of FSAK and toric IOL ...
Hoon Noh, Young-Sik Yoo, Kyoung Yoon Shin, Dong Hui Lim, Tae-Young Chung   +4 more
doaj   +1 more source

Lyot-based Low Order Wavefront Sensor: Implementation on the Subaru Coronagraphic Extreme Adaptive Optics System and its Laboratory Performance

, 2014
High throughput, low inner working angle (IWA) phase masks coronagraphs are essential to directly image and characterize (via spectroscopy) earth-like planets.
Baudoz, Pierre, Guyon, Olivier, Jovanovic, Nemanja, Kudo, Tomoyuki, Kuhn, Jonas G, Martinache, Frantz, Serabyn, Eugene, Singh, Garima   +7 more
core   +2 more sources

Surgical approaches to correct corneal astigmatism at time of cataract surgery: a mini-review [PDF]

International Journal of Ophthalmology
Among refractive errors, astigmatism is the most common optical aberration, where refraction changes in different meridians of the eye. It causes blurred vision at any distance and includes corneal, lenticular, and retinal astigmatism.
Xiao-Lei Yin, Zhi-Yang Ji, Xiu-Xin Li, Xue-Mei Liang, Shu-Xing Ji   +4 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

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

Comparing surgically induced astigmatism calculated by means of simulated keratometry versus total corneal refractive power [PDF]

, 2018
Purpose: To evaluate surgically induced astigmatism as computed by means of either simulated keratometry (KSIM) or total corneal refractive power (TCRP) after temporal incisions.
Calvo Sanz, Jorge A., Carmona González, David, Fernández, Joaquín, Garzón Jiménez, Nuria, Palomino Bautista, Carlos, Poyales Galán, Francisco, Rodríguez Vallejo, Manuel, Zato Gómez de Liaño, Miguel Á   +7 more
core   +2 more sources