نتایج جستجو برای: near visual acuity
تعداد نتایج: 615637 فیلتر نتایج به سال:
BACKGROUND To test and compare in a masked fashion the efficacy of using a parasympathomimetic drug (3% carbachol) and an alpha-2 agonist (0.2% brimonidine) in both combined and separate forms to create optically beneficial miosis to pharmacologically improve vision in presbyopia. METHODS A prospective, double-masked, randomized, controlled clinical trial was conducted. Ten naturally emmetrop...
Purpose. To evaluate prospectively the safety and efficacy of optimal keratoplasty for the correction of hyperopia and presbyopia. Methods. Consecutive patients undergoing bilateral optimal keratoplasty for refractive presbyopic and hypermetropic corrections were enrolled. Each patient received a complete ophthalmologic examination at baseline, 1 hour, 1 day, 1 week, 1 month, 3 months, and 6 mo...
The choices of intraocular lenses (IOLs) available for implantation in cataract patients are multitudinous. Each option features significant benefits for visual performance and the comfort of the patients, but there are also some inherent limitations in each case. The traditional approach of monofocal IOL implantation is effective in providing adequate distance visual acuity, but is limited in ...
OBJECTIVE To evaluate the effectiveness of treatment of amblyopia in children aged 7 to 17 years. METHODS At 49 clinical sites, 507 patients with amblyopic eye visual acuity ranging from 20/40 to 20/400 were provided with optimal optical correction and then randomized to a treatment group (2-6 hours per day of prescribed patching combined with near visual activities for all patients plus atro...
PURPOSE To investigate binocular visual acuity and depth of focus when one eye forms images through a typical pupil diameter aperture (4 mm) and the other eye through a small pupil of 1.5-mm diameter. METHODS Using a recently developed adaptive optics binocular visual simulator, through focus monocular and binocular visual acuity were measured in three subjects under specially simulated visua...
Purpose: Investigate the prevalence of near vision impairment in older adults in a low-middle income urban area of São Paulo city, Brazil. Methods: Cluster sampling based on geographically-defined census sectors was used in randomly selecting individuals ≥50 years of age for visual acuity measurement for near and distance (tumble E logMAR chart), refraction, and slit-lamp examination during 200...
This study looked at the causes of vision loss, levels of distance, near vision and the use of low vision devices (LVDs) in children studying at special schools in Malaysia. A total of 139 children from two special education schools took part. Visual acuity was measured with and without LVDs. Those who required further assessment were referred to Low Vision Clinic. Near visual acuity in 71 chil...
PURPOSE To investigate the convergence-induced waveform and high-acuity-field improvements resulting from different therapies in two subjects with infantile nystagmus (IN) that was damped by convergence and to report a new finding in one of the subjects. METHODS Infrared reflection was used to measure eye movements during fixation of targets at different gaze and convergence angles and the ex...
purpose: to compare the effect of high dose intravenous corticosteroid therapy with placebo in the treatment of recent traumatic optic neuropathy (ton). methods: in a double masked-placebo controlled clinical trial, 31 eyes of 31 patients were randomly assigned into two groups. only patients with history of ophthalmic or head trauma within the past 7 days were included. unconscious patients, th...
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