نتایج جستجو برای: refractive error
تعداد نتایج: 271299 فیلتر نتایج به سال:
background: the latest who report indicates that refractive errors are the leading cause of visual impairment throughout the world. the aim of this study was to determine the prevalence of myopia, hyperopia, and astigmatism in 7 yr old children in iran. methods : in a cross-sectional study in 2013 with multistage cluster sampling, first graders were randomly selected from 8 cities in iran. all ...
PURPOSE To evaluate refractive error, axial length, and relative peripheral refractive error before, during the year of, and after the onset of myopia in children who became myopic compared with emmetropes. METHODS Subjects were 605 children 6 to 14 years of age who became myopic (at least -0.75 D in each meridian) and 374 emmetropic (between -0.25 D and +1.00 D in each meridian at all visits...
We analyzed the contribution of individual ocular components to vision-induced ametropias in 210 rhesus monkeys. The primary contribution to refractive-error development came from vitreous chamber depth; a minor contribution from corneal power was also detected. However, there was no systematic relationship between refractive error and anterior chamber depth or between refractive error and any ...
Background and Objective: Ocular biometry refers to the measurement of the axial length of the eye and thickness of the intraocular structures. This process is routinely performed for all patients before cataract surgery. The accuracy of the biometric data is directly associated with the refractive status after cataract surgery. Currently, two methods of biometry, namely ultrasound and optical ...
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