This study examined the hypothesis that the effective visual field of 5-year-old children is smaller than that of 8-year-old children and adults. In addition, an effort was made to determine whether task demands affect the size of the effective visual field and if so, whether the effects on performance are different for children and adults. A…

The capacity of the visually impaired to perform normal tasks is the basis of a new classification system proposed to supplant the current legal definition of blindness, now based on arbitrary numerical values used to measure visual acuity and angular field. A discussion of the current plight of the visually impaired focuses on the failure of the…

A hand-operated mechanical device, called an X-Y Platform because of its ability to undergo orthogonal planar motions reminiscent of X and Y coordinates, permits design simplifications and lower costs when used with RANDSIGHT-type closed circuit television to enable the partially sighted to read and write. This paper presents a detailed discussion…

Threshold luminance necessary to evoke an eye movement was evaluated as a function of age (6-21 years) and visual angle (6-42 degrees from the fovea). (BRT)

This article provides a guide to sources of large type books for the partially sighted adult and child. Several catalogs as well as other sources are discussed. (STS)

The concepts of two totally blind children, ages four and five, concerning how people see, were evaluated by asking them to show objects to either sighted people or each other. Their performance indicated they understood that blind people need to feel objects but sighted persons do not. (Author/DB)

The study examined question frequencies and types in language samples from 36 sighted and visually impaired children (4-10 years old). Results demonstrated significant differences between blind/sighted and low vision/sighted groups in the ratio of questions asked. Comparison of question types indicated some minor distinctions of type of usage by…

Clinical techniques for visual screening of infants that are not used in routine pediatric examinations include optokinetic nystagmus, preferential looking, and visually evoked potential. Greater use of such techniques might increase success of nonsurgical remedial intervention. (CL)

The Perkins-Binet Test of Intelligence for the Blind, Form U; the Wechsler Intelligence Scale for Children-Revised (WISC-R), Verbal Scale; and the Wide Range Achievement Test (WRAT) were administered to 52 low-vision children in the third, fifth, seventh, and ninth grades. Results indicated that the mean ten scores on the two tests of intelligence…

Active and passive perceptual training methods were tested with 30 macular degeneration patients to improve their residual vision. The main conclusion was that perceptual training may contribute to successful visual adjustment and that the effect of training is not limited to a particular level of visual impairment. (Author/CL)

A model is proposed that organizes factors related to visual function into three dimensions: visual abilities, available resources and past experiences, and environmental cues. The model is explained to be useful in determining how to elicit visual behaviors or maximize visual function in persons with low vision. (Author/CL)

Shows that the perceived shade of gray depends on the luminance relationship between surfaces perceived to be in the same plane and not between surfaces that are merely adjacent in the retinal image. This implies that lateral inhibition cannot explain lightness constancy. (MLH)

This paper presents evidence about the emergence of a research community in mathematics education by contrasting work in the field in the 1960s with current work with regard to six features of such communities. Based on this contrast, the claim that a research community in mathematics education has emerged is only partially supported. (a) Today,…

The article explains what both the Food and Drug Administration is doing and what consumers can do to control the risk of infection from contaminated eye products. (KW)

This paper was part of a symposium on Reading Disabilities presented to teachers in the Denver Public Schools. (Author)