Electronic devices with small visual displays (SVDs) are often inaccessible to the millions of Americans with vision loss. The Barten square root integral (SQRI) is an image quality metric that has been shown to predict whether people with normal vision can see images on a cathode ray tube monitor. The present proof-of-concept study begins to explore whether the same metric could predict the ab...

purpose: to describe causes of low vision and blindness in patients referred for low vision aids to rehabilitation clinics at shahid beheshti medical university during 2005. methods: visual acuity was classified to five groups based on best-corrected visual acuity (bcva) in the better eye according to world health organization (who) criteria and by using standard snellen chart which included mi...

Background: Blindness and low vision are major causes of morbidity and constitute a significant public health problem, both detrimental to the quality of life for the individual and an economic burden on the individual, family, and society in general. People with low vision have the potential for enhancement of functional vision if they receive the appropriate low vision services. The present s...

AIMS To substantiate the claim that low vision aids reduce the degree of disability associated with visual impairment. METHODS An observational study of vision, ocular pathology, age, sex, and reading ability in new referrals to a low vision clinic. Reading ability was assessed both with the patients' own spectacles and with an appropriate low vision aid. RESULTS The reading performance and...

In the current time, development of urban centers is a very complex process in terms new residential or administrative building locations expansion, but also design and/or combination constructions with environment. same context, various transport development, communication social activities facilities require an important database and infrastructure to ensure satisfy population needs at highes...

Simple but effective tests have been produced for screening subjects with low vision in developing countries. These tests of distance and near vision, based on the E test, were evaluated and validated in trials with people aged 4-90 years, and have been field tested in the health, education and rehabilitation services in 32 developing countries. Their sensitivity and specificity as screening to...