نتایج جستجو برای: distant visual acuity

تعداد نتایج: 400915  

Journal: :Journal of the Royal Society of Medicine 1980

Journal: :The British journal of ophthalmology 1953
M GILBERT

IT is well known that different types of test object will give different measures of acuity in terms of the size of the angle subtended at an observer's eye by the critical detail in the test object. Acuity of an average observer may vary from 1" arc, the thickness of a single black line just discernible on a white background, to about 1' arc, the size of a gap in a black ring viewed on a white...

Journal: :Archives of ophthalmology 2011
Mariana S Lopes Shiri Zayit-Soudry Ala Moshiri Susan B Bressler Neil M Bressler

V isual acuity is an important measure for assessment of visual function. While there are many charts available to test visual acuity, there is lack of consistency in the methods of testing and methods of reporting visual acuity that may make comparisons difficult between visual outcomes among different published studies. In our opinion, most US ophthalmologists are familiar with the Snellen no...

Journal: :Investigative ophthalmology & visual science 2011
Valeria L N Fu Richard A Bilonick Joost Felius Richard W Hertle Eileen E Birch

PURPOSE Infantile nystagmus syndrome (INS) can be idiopathic or associated with ocular or systemic disease. The ocular oscillation of INS directly contributes to loss of visual acuity. In this study, visual acuity development in patients with INS was examined. METHODS Children with INS were classified as having idiopathic INS (n = 84) or INS with an associated sensory deficit: INS and albinis...

خباز خوب, مهدی, فتوحی, اکبر, محمد, کاظم, هاشمی, حسن,

Background & Objectives: Early detection can improve the outcome of visual impairment in children, and one method for early detection could be screening of pre-school children with visual acuity tests. The aim of this study was to determine the validity of these tests when they are used on children entering grade school.Methods: For this cross-sectional study we drew 39 random clusters, compris...

Journal: :Journal of the Optical Society of America A 2003

Journal: :Experimental Gerontology 1986

Journal: :British Journal of Ophthalmology 1983

Journal: :The Journal of Japan Institute of Navigation 1976

Journal: :The Tohoku journal of experimental medicine 2008
Masanobu Uchiyama Shinichi Demura

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...

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