نتایج جستجو برای: refractive error
تعداد نتایج: 271299 فیلتر نتایج به سال:
BACKGROUND The study is a retrospective review of the pattern of refractive errors in presbyopic patients seen in the eye clinic from January to December, 2009. PATIENTS AND METHODS The clinic refraction register was used to retrieve the case folders of all patients refracted during the review period. Information extracted includes patient's age, sex, and types of refractive error. Unaided an...
BACKGROUND To determine the change in refractive error and the incidence of myopia among school-aged children in the Yongchuan District of Chongqing City, Western China. METHODS A population-based cross-sectional survey was initially conducted in 2006 among 3070 children aged 6 to 15 years. A longitudinal follow-up study was then conducted 5 years later between November 2011 and March 2012. R...
The purpose of this letter is to present a simplified mathematical model of progressive myopia. A proposed hypothesis for refractive error development of the human eye requires that there is an optical signal related to the amount of refractive error which would in turn correct the refractive error of the eye. A specific first-order feedback system, defined by the transfer function F (s) = 1 / ...
INTRODUCTION Refractive errors are a major cause of visual impairment in the population. PURPOSE To find the pattern of refractive errors among patients evaluated in a tertiary care hospital in the western region of Nepal. MATERIALS AND METHODS The present hospital-based retrospective study was conducted in the Department of Ophthalmology of the Manipal Teaching Hospital, situated in Pokhar...
Background and Aim: Refractive errors are the most common reasons for patients' reference to ophthalmology clinics. Regarding that systemic hypertension has significant complications in the eyes this study was done to determine the relationship between refractive errors and systemic hypertension. Materials and Methods: This descriptive, analytical and cross-sectional study was done on pa...
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