نتایج جستجو برای: residual refractive errors
تعداد نتایج: 245765 فیلتر نتایج به سال:
Introduction: Today, Lasik surgery is one of the most common and effective procedures for correction of refractive errors. Less than 1% of patients undergoing Lasik operation suffer from serious and 3-5% suffers from mild complications. Also, results of lasik in most centers are promising. With the recent inauguration of the Lasik center of Yazd, it was decided to evaluate the results and compl...
purpose : to determine the prevalence of the uncorrected refractive errors in bojnourd students methods : in a cross-sectional study, the samples were selected proportionate to the population of the schools using stratified randomized cluster sampling. the target population was the primary and junior high school students of the city of bojnourd. visual acuity (va) (snellen chart) and cycloplegi...
Background & Objectives: To determine the prevalence rates of refractive errors in Mashhad, Iran Methods: In this population-based study, random cluster sampling was performed on the urban population of Mashhad and of 4453 selected individuals, 70.4% participated in the study. Refractive errors were assessed using cycloplegic refraction in participants who were ≤ 15 years of age and non-cycl...
the hospital, for whatever reason. • Human resources: both the number of people required (capacity) and the skills required (competence). • Quality: measuring and ensuring high quality clinical outcomes and patient satisfaction. • Operating efficiency: ensuring that scarce resources are optimally used. • Financial viability: pricing to ensure affordability, and putting in place revenue and cost...
Impact of spatial aggregation error on the spatial scan analysis: a case study of colorectal cancer.
The paper aims to estimate the level and impact of spatial aggregation error for spatial scan statistics where disaggregated data below the zip code level are not available. Data on colorectal cancer cases in Cook county, Illinois, USA with a 5-year interval were used. An innovative procedure using SAS and Java was designed to make SaTScan auto-run. Characteristics of clusters at each reference...
purpose: to compare post-operative pain with cooling photorefractive keratectomy (prk) versus conventional prk. methods: a prospective clinical trial was performed on 94 eyes from 47 patients scheduled for prk. patients were randomly assigned to either cooling or conventional prk. pain was evaluated 6, 12, 24 and 48 hours post-operation using a visual analogue scale (vas). corneal haze, conjunc...
purpose : to determine the prevalence of refractive errors, strabismus and amblyopia in the schoolboys of varamin city, iran methods : in a cross-sectional population-based study in 2010, we used random cluster sampling to select the participants from varamin high school students. examinations were conducted at the school site under standard conditions. all students had non-cycloplegic refracti...
Human face-recognition processes must maintain high levels of performance under different viewing conditions. An important dimension of variability is image resolution, which is affected by distance, refractive errors, and light levels. Here, we investigate how changes in resolution modulate the visual-system's ability to detect featural versus configural changes in face images. It has been sug...
The World Health Organization informal planning meeting, in July 2000, clearly indicated that detailed comparisons of refractive error prevalence across study reports are generally not possible because of different measurement methods and definitions. Further, because most studies are carried out using samples of unknown representativeness, interpretation of the findings in a population-based c...
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