Results 11 to 20 of about 260,600 (296)
TNOA Journal of Ophthalmic Science and Research, 2021 Aim: To study the prevalence of computer vision syndrome (CVS) and dry eyes in computer operators. Materials and Methods: The cross-sectional study was conducted at teaching institute.
Sanjeev Verma +3 more
doaj +1 more source
Negative refraction in nonlinear wave systems [PDF]
, 2007 People have been familiar with the phenomenon of wave refraction for several centuries. Recently, a novel type of refraction, i.e., negative refraction, where both incident and refractory lines locate on the same side of the normal line, has been ...
Gang Hu +5 more
core +1 more source
Indian Journal of Ophthalmology, 2020 Purpose: Barrett Universal II (BU-II) is considered as one of the most accurate intraocular lens (IOL) power calculation formulas; however, there is no literature studying the same in Indian population.
Nikhil Kuthirummal +6 more
doaj +1 more source
Comparison of visual performance recovery after thin-flap LASIK with 4 femtosecond lasers [PDF]
International Journal of Ophthalmology, 2017 AIM: To compare the speed of visual recovery following myopic thin-flap LASIK with four femtosecond lasers. METHODS: Eighty-eight eyes of 46 patients who were consecutively scheduled for bilateral LASIK with the IntraLase FS60 (Group 1), Femto LDV ...
Jing Zhang +3 more
doaj +1 more source
Amphoteric refraction at the interface between isotropic and anisotropic media [PDF]
, 2006 It is found that the amphoteric refraction, i.e. the refraction can be either positive or negative depending on the incident angles, could occur at a planar interface associated with a uniaxially anisotropic positive index media (PIM) or an anisotropic ...
Feise +34 more
core +2 more sources
Refraction problems after refractive surgery
Survey of Ophthalmology, 1988 While refractive surgery such as radial keratotomy, epikeratophakia, and corneal relaxing incisions offer many potential benefits to patients, they can also generate optical problems such as overcorrection or undercorrection of the prior refractive error and variable vision.
Dean McGee Eye Institute, University of Oklahoma, Oklahoma City, Oklahoma, USA ( host institution ) +2 more
openaire +3 more sources
Effect of Capsular Tension Ring Implantation during Phacoemulsification on Postoperative Refraction
Oftalʹmologiâ, 2022 Purpose. To assess refractive result of phacoemulsification (PE) with capsular tension ring (CTR) implantation.Patients and methods. In total, 37 eyes of 37 patients who underwent PE with intraocular lens (IOL) implantation were divided into 2 groups ...
D. F. Belov, V. P. Nikolaenko
doaj +1 more source
What are the left-handed media and what is interesting about them? [PDF]
, 2004 We review the intensively discussed ideas about wave propagation and refraction in media where both electric permittivity and magnetic permeability are negative. The criticism against negative refraction as violating the causality principle is considered.
Bliokh, K. Yu., Bliokh, Yu. P.
core +1 more source
Children, 2023 The purpose of this study was to assess the effect of orthokeratology treatment with DRL lenses on the control of myopia progression compared with single vision glasses users (monofocal glasses).
António Queirós +9 more
doaj +1 more source
Comment on: "Electromagnetically induced left-handedness in optically excited four-level atomic media" [PDF]
, 2006 We discuss the recent proposal by Thommen and Mandel (Phys. Rev. Lett. {\bf 96}, 053601 (2006)) for electromagnetically induced negative refraction.
Fleischhauer, Michael, Kästel, Jürgen
core +2 more sources