Vision contributes to upright postural control by providing afferent feedback to the cerebellum. Vision is generally classified into central and peripheral vision, but little is known about the respective role of central and peripheral vision for postural control with different visual acuity levels. This study examined the influence of visual acuity and visual field conditions on upright postur...

Vision loss typically affects either the wide peripheral vision (important for mobility), or central vision (important for seeing details). Traditional optical visual aids usually recover the lost visual function, but at a high cost for the remaining visual function. We have developed a novel concept of vision-multiplexing using augmented vision head-mounted display systems to address vision lo...

in this study, the experimental analysis on the bare hull resistance coefficient of submarine at snorkel depth is represented. the experiments are conducted in marine laboratory of admiral makarov university. the results are presented for surface condition and snorkel condition. snorkel depth is regarded equal to one diameter of submarine hull beneath the water surface as usual in submarines. p...

PURPOSE To examine the ability of current surveillance systems to assess and monitor disparities in: (1) vision impairment, (2) eye disease, (3) vision-related functioning, (4) access to vision and eye care, and (5) access to supports and services for those needing vision rehabilitation. DESIGN Review of surveillance systems and instruments. METHODS We defined surveys and surveillance syste...

There have been significant advances in our understanding of mammalian color vision over the past 15 years. This paper reviews a number of topics that have been central to these recent efforts, including: (1) the extent and nature of ultraviolet vision in mammals, (2) the evolutionary loss of short-wavelength-sensitive cones in some mammals, (3) the possible roles of rod signals in mammalian co...

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...

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...