نتایج جستجو برای: uncorrected refractive error
تعداد نتایج: 274032 فیلتر نتایج به سال:
Background: Uncorrected errors of refraction are the leading cause moderate to severe visual impairment. This study helps determine risk factors and prevalence refractive error among medical students evaluate uncorrected acuity them. Aim was disturbances undergraduate students. Methods: A cross sectional conducted 200 Data on socio-demographic characteristics, type errors, for frequency eye exa...
BACKGROUND/AIMS The prevalence of significant refractive errors and other eye diseases was measured in 2511 secondary school students aged 11-27 years in Mwanza City, Tanzania. Risk factors for myopia were explored. METHODS A questionnaire assessed the students' socioeconomic background and exposure to near work followed by visual acuity assessment and a full eye examination. Non-cycloplegic ...
purpose : to determine the prevalence of the refractive errors in the elderly population of sari, iran methods : in this study, after selecting the participants through random cluster sampling, they all received ocular examinations including visual acuity (va) measurement, refraction, fundoscopy and tonometry. after measuring uncorrected visual acuity (ucva), non-cycloplegic refraction was perf...
purpose: to evaluate the visual outcomes of cross-cylinder ablation in laser in situ keratomileusis (lasik) for eyes with high astigmatic refractive errors and low spherical component. methods: we prospectively evaluated cross cylinder lasik in patients with high astigmatic refractive error but low spherical component over a period of 2 years. all procedures were performed with the nidek ec-500...
PURPOSE To evaluate the effectiveness of toric intraocular lens (IOL) implantation combined with limbal relaxing incision (LRI) for patients with high-amplitude astigmatism. METHODS This single-center, prospective study evaluated 22 eyes of 19 patients with cataract and >2.50 diopters (D) astigmatism that underwent bimanual micro-phacoemulsification cataract surgery and toric IOL implantation...
purpose: to determine the screening prevalence of amblyopia, refractive errors and strabismus among 7 to 12 year-old primary school children, tehran, iran, in 2013. methods: this population based cross sectional study was performed on randomly selected 2410 students from 40 primary schools. visual acuity was measured using yang vision tester snellen e-optotype. if visual acuity was ≤20/40, the ...
PURPOSE The aims of this study are to define the various stages of capsular contraction syndrome (CCS) and its effect on refractive error with hinge-based accommodating intraocular lenses (IOLs) and to describe a systematic approach for the management of the different stages of CCS. METHODS Hinge-based accommodative IOLs function via flexible hinges that vault the optic forward during accommo...
purpose: to determine the outcomes of visual correction with femto-lasik following pk. methods: in this prospective study, 34 eyes of 31 patient who had undergone thin – flap lasik due to high refractive error after corneal grafting were evaluated .after complete ocular examination and assessment of uncorrected and corrected distant visual acuity (ucva and bcva) , the patients underwent femto-l...
PURPOSE To evaluate refractive and visual parameters related to distance, intermediate, and near vision after cataract surgery and the optical quality of a new diffractive trifocal intraocular lens (IOL). SETTING Vissum Instituto Oftalmologico de Alicante, Alicante, Spain. DESIGN Case series. METHODS Patients had bilateral refractive lens exchange and multifocal diffractive IOL (AT Lisa t...
BACKGROUND Contemporary data for causes of vision impairment and blindness form an important basis of recommendations in public health policies. Refreshment of the Global Vision Database with recently published data sources permitted modelling of cause of vision loss data from 1990 to 2015, further disaggregation by cause, and forecasts to 2020. METHODS In this systematic review and meta-anal...
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