The current definition of Cerebral Visual Impairment (CVI) includes all visual dysfunctions caused by damage to, or malfunctioning of, the retrochiasmatic visual pathways in the absence of damage to the anterior visual pathways or any major ocular disease. CVI is diagnosed by exclusion and the existence of many different causes and symptoms make…

Reasons for the relative lack of literature dealing with spatial concepts of low-vision children are suggested, and two assumptions are seen as invalid: (1) that knowledge of spatial concepts is not important for persons with low vision and (2) that children with low vision have adequate knowledge of spatial concepts. (CL)

Comparison of 2 totally blind, 2 visually impaired, and 9 normally sighted children (ages 5-8) on tasks of visual perspective taking found that the totally blind children were older than the other children when they mastered the tasks, made the highest percentage of errors before mastery, and made different errors. (Author/DB)

This article describes the physiological mechanisms involved in three-dimensional depth perception and presents a variety of distance and depth cues and strategies for detecting and estimating curbs and steps for individuals with impaired vision. (Author/DB)

This article reports on a study of the spatial mapping skills of two totally blind, two visually impaired, and eight normally sighted children. Children were asked to point to familiar locations in and around their homes. Results suggest that blindness interferes with the development of spatial knowledge in which Euclidean directions between…

Retinitis pigmentosa (RP) causes restriction of the visual field, progressive vision loss, and night blindness. This article presents an overview of the most common problems in orientation and mobility (O&M) for individuals with RP, appropriate interventions, vision science discoveries related to RP, and the impact of RP on functional visual…

The article describes a project in which blind and partially sighted children used a computer-guided floor turtle to develop spatial concepts such as right and left and accurate facing movements. (Author/DB)

This study compared effects of visual occlusion on the motor and spatial learning of 28 legally blind adult males, half due to acuity loss and half due to peripheral field restriction. For both groups, occlusion appeared neither to facilitate nor impede motor learning but did significantly impair acquisition of spatial relations. Results have…

Eighty-eight children (either totally blind or with residual vision) estimated directions between landmarks in a large scale layout of objects. Children experienced the layout either directly by walking around it or indirectly by examining a tactile map. Use of tactile maps considerably facilitated the performance of the blind children. (Author/DB)

This study, involving 20 children (ages 6-12) with legal blindness or partial sight, explored the relationships between ability to read and performance on tasks which require the manipulation of figure/ground relations. Significant differences were found between fluent readers and poor readers/nonreaders on four of the six tasks. No age…

Young children with low vision tend to experience delays in cognitive development, motor development, and social skills because of insufficient motivation and opportunities to explore their environments actively. This literature review explores the resulting difficulties in acquiring practical knowledge and spatial/environmental concepts,…