VISUAL AIDS FOR THE PARTIALLY SIGHTED
نویسندگان
چکیده
منابع مشابه
Visual aids for the partially sighted.
THOSE who are substantially and permanently handicapped by defective vision resulting from illness, injury, or congenital deformity may be described as partially sighted. The following criteria are suggested as a general guide in estimating " substantial handicap": (1) Visual acuity 3/60 to 6/60, with full visual fields. (2) Visual acuity up to 6/24, with moderate contraction of the visual fiel...
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Zebra-crossings are useful road features for outdoor navigation in mobility aids for the partially sighted. In this paper, zebra-crossings are detected by looking for groups of concurrent lines, edges are then partitioned using intensity variation information. In order to tackle the ambiguity of the detection algorithm in distinguishing zebra-crossings and stair-cases, pose information is sough...
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A Galilean telescope consists ofa convex objective lens separated from a concave ocular lens by the sum of their secondary focal lengths. The optical system is an afocal one, i.e. the incident and emergent light are parallel. The magnification (M) of this afocal system is obtained by dividing the dioptric power of the ocular (F2) by the dioptric power of the objective (FI), i.e. M = -F2/F1 = -f...
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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...
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Veterinary surgeons provide an important service to blind and partially sighted guide dog owners. By adopting basic disability awareness and visual impairment training, practices can ensure that the assistance needs of those clients are met, facilitating access to veterinary care.
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ژورنال
عنوان ژورنال: British Journal of Ophthalmology
سال: 1960
ISSN: 0007-1161
DOI: 10.1136/bjo.44.11.672