Results 51 to 60 of about 78,366 (184)

Changes in corneal asphericity after laser in situ keratomileusis [PDF]

Journal of Cataract and Refractive Surgery, 2003
To analyze the origin of the changes in corneal asphericity (p-factor) after laser in situ keratomileusis (LASIK) and the effect of postsurgery asphericity on contrast-sensitivity function (CSF) under photopic conditions.Department of Optics, University of Granada, Granada, Spain.The p-factor and CSF (best corrected before surgery and 1, 3, and 6 ...
Rosario G, Anera, Jose R, Jiménez, Luis, Jiménez del Barco, Javier, Bermúdez, Enrique, Hita   +4 more
openaire   +2 more sources

Corneal Asphericity Variations in Korean Myopic Children

Annals of Optometry and Contact Lens, 2022
Purpose: Corneal asphericity (Q-value) represents the difference in curvature from center to periphery of the cornea. This study evaluated horizontal and vertical asymmetry in corneal asphericity in myopic children and its relationship with various ocular parameters.Methods: This retrospective study included 47 eyes in 24 myopic Korean children ...
Hyo Sin Kim, Sun-Kyung Park, Woong-Joo Whang, Ho Sik Hwangm, Kyung-Sun Na   +4 more
openaire   +1 more source

Prediction model for best focus, power, and spherical aberration of the cornea: Raytracing on a large dataset of OCT data.

PLoS ONE, 2021
PurposeTo analyse corneal power based on a large optical coherence tomography dataset using raytracing, and to evaluate corneal power with respect to the corneal front apex plane for different definitions of best focus.MethodsA large OCT dataset (10,218 ...
Achim Langenbucher, Nóra Szentmáry, Johannes Weisensee, Jascha Wendelstein, Alan Cayless, Rupert Menapace, Peter Hoffmann   +6 more
doaj   +1 more source

The number of intracorneal ring segments in asymmetric and central cones

Eye and Vision, 2021
Background To compare the results of single versus double intracorneal ring segment (ICRS) (KeraRing) implantation in keratoconus with respect to different cone locations.
Canan Asli Utine, Denizcan Özizmirliler, Mustafa Kayabaşı, Üzeyir Günenç   +3 more
doaj   +1 more source

Changes in corneal asphericity and spherical aberration after femtosecond laser in situ keratomileusis

Delta Journal of Ophthalmology, 2021
Purpose The aim of this study was to evaluate the changes in corneal asphericity (Q value) and spherical aberration after femtosecond laser in situ keratomileusis using Scheimpflug imaging.
Mohamed El-Kateb
doaj   +1 more source

Analysis of Corneal Spherical Aberrations in Chinese Bilateral Ectopia Lentis Patients

Frontiers in Medicine, 2021
Purpose: To analyze the anterior, posterior, and total corneal spherical aberrations (ASA, PSA, and TSA) in patients with Chinese bilateral ectopia lentis (EL).Methods: A cross-sectional study was conducted to evaluate corneal spherical aberration (CSA ...
Jiahui Chen, Jiahui Chen, Jiahui Chen, Yating Tang, Yating Tang, Yating Tang, Qinghe Jing, Qinghe Jing, Qinghe Jing, Yi Lu, Yi Lu, Yi Lu, Yongxiang Jiang, Yongxiang Jiang, Yongxiang Jiang   +14 more
doaj   +1 more source

Premium Intraocular Lens Selection in Patients With Glaucoma: A Clinical Review

Clinical &Experimental Ophthalmology, EarlyView.
ABSTRACT Glaucoma frequently coexists with cataract, but glaucomatous functional loss, ocular‐surface disease, anatomical abnormalities, and treatment‐related refractive variability may reduce tolerance of premium intraocular lenses. This narrative review critically appraises evidence relevant to lens selection in glaucoma. Central visual‐field status,
Zhihao Liu, Yajuan Zheng, Mingxuan Wang, Jing Zhao   +3 more
wiley   +1 more source

Linear regression analysis showing changes in asphericity for 8-mm corneal diameter (Corneal Wavefront).

, 2017
Linear regression analysis showing changes in asphericity for 8-mm corneal diameter (Corneal Wavefront).
Mihyun Choi (3740515), Jee Hye Lee (3364217), Geunyoung Yoon (3740524), Choun-Ki Joo (424803), Ying-Jun Li (3740518), Woong-Joo Whang (3740527), JunJie Piao (3740512), Min Ji Kang (3740521)   +7 more
core   +1 more source

Limbal cystotomy by fine needle aspiration of a translucent iris cyst in a horse

Equine Veterinary Education, EarlyView.
Summary A 4‐year‐old Cremello crossbred mare was referred to the Equine Veterinary Teaching Hospital of Utrecht University for a translucent iris cyst from the dorsal pupillary margin corpora nigra in the right eye. Although noninvasive diode laser treatment is the preferred method of pigmented cyst ablation, two attempts did not result in disruption ...
A. L. Hendrikx, S. Veraa, J. P. A. M. van Loon, H. Hermans, I. J. M. Slenter, E. M. S. Visser   +5 more
wiley   +1 more source

Understanding higher‐order aberrations in keratoconus

Optometry and Vision Science, Volume 103, Issue 10, October 2026.
ABSTRACT Keratoconus is characterized by progressive thinning and increasing irregularity of the cornea, leading to substantial degradation in optical quality through the induction of both lower‐ and higher‐order aberrations (HOAs). In addition to inducing myopic and astigmatic refractive error, asymmetric corneal steepening generates complex optical ...
Gavin Swartz, Khyber Alam, Alex Gentle, Laura E. Downie   +3 more
wiley   +1 more source