objectives: the blind and visually disabled people form a predominant group in the disabled society and hence, need greater attention. most of the rehabilitation therapists, especially occupational therapists, do not focus on this group. thus, the aim of the study is to shed light on the issue of negligent attitude of rehabilitation therapists, especially occupational therapists, toward blind a...

introduction: the decline of visual function with increasing age is a significant concern in elderly. despite previous work on prevalence of specific ophthalmic pathologies, there has not been enough valid data about overall eye disorders in tehran yet, and it is poorly defined and not underpinned by strong evidence. the purpose of this study was to investigate the common eye disorders in the e...

variations in lighting are a problem for visual systems. in the current research, a new thresholding method using a 3d euclidian elliptical surface was defined and applied for plant detection purposes. the results showed that this method had lower type i error, type ii error, total error and mean square error compared with those of conventional segmentation methods. the method was evaluated for...

sorting and classification of agricultural products by machine vision system reduce costs and increase quality and accuracy. this research was performed to develop an algorithm and machine vision system for separating dirty and defects eggs and classifying by volume and weight. this machine installed on transport line egg in agriculture included a digital camera, computer and mechanical device ...

purpose: to determine the prevalence and causes of blindness and low vision in yazd provice in 2008. methods: a population-based cross-sectional study was performed on inhabitants of in yazd province in 2008. using multistage cluster sampling, sample size was calculated based on the distribution of the total population of yazd province derived from national census and estimated rates of blindne...

purpose: vision disorders are closely associated with poverty, particularly blindness. we determined the prevalence of low vision and blindness in different socioeconomic levels. our goal was determination of correlation between socioeconomic determinants and visual acuity in varamin city. methods: this community based study was done on 2737 people over the age of 50 years, living varamin city ...

background: adverse effect of sun rays mainly uv ray on the human eye documented and protection of eyes is necessary using different methods such as, sun glasses. sunglasses are designed in different colors. the aim of this study was evaluation of the effect of different colors of sunglasses on the visual acuity, contrast sensitivity, stereopsis and color vision. methods: 81 normal subjects wer...