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)

Among results comparing attainment of the conservation concept in blind (N=30), partially sighted (N=50), and sighted (N=40) children (ages 6-15) in Taiwan were that development of partially sighted children was more like the development of sighted than blind children, and that a 1-4 year developmental lag occurred in blind children. (Author/DB)

A comparative study of conservation development in partially sighted, sighted, and sighted blindfolded children at four age levels was assessed. Conservation on tasks of mass, weight, and volume were evaluated using Piaget and Inhelder's prediction, judgment, and explanation questions. The significant differences were found between groups, task,…

This study evaluated the knowledge of Level 1 and Level 2 rules of perspective taking by 18 8-year-old children (either congenitally blind, congenitally low vision, or sighted). All children understood Level 1 rules; their knowledge of Level 2 rules (that a heterogeneously sided object will appear differently to viewers from different sides)…

The development of the concept of conservation was examined in 120 elementary school children divided into three groups: partially sighted, sighted, and sighted-blindfolded. (CM)

Thirty-seven students who were blind or had low vision listed as many examples of 10 categories as they could and the prototype order of examples was scored. No differences between blind or low-vision students were found, but categories with which the students had a greater degree of direct sensory experience produced more examples and higher…

Fifty partially sighted children (7 to 18 years old) were studied along 143 variables to provide a comprehensive profile in the areas of cognitive, psychomotor, academic, and neuropsychological development. The Halstead-Reitan Neuropsychological Battery was the principal data collection instrument, supplemented by the Stephen's Piagetian Battery…

Fifty low vision children, aged 7 to 18, assessed with the case-study method on 143 variables using the Halstead-Reitan Neuropsychological Battery, Stephens Piagetian Battery of Reasoning Assessments, and Standardized achievement test were found to have significant delays in cognitive and psychomotor development and academic achievement. (Author)

Analysis of scores of 118 visually impaired children on the Wechsler Intelligence Scale for Children (Revised) and the Wechsler Preschool and Primary Scales of Intelligence (Revised) found a consistent response pattern suggesting that the verbal as well as the performance tests provide useful assessment information. (Author/DB)

Through seriation, verbal seriation, and conservation tasks, investigated blind, partially sighted, and sighted children's understanding of quantity. Subjects were 81 children equally dispersed through these 3 groups. Age range was 4 to 17 years. Found similarity in concept acquisition among three groups that extended beyond quantity conservation…

Questionnaire results from l04 psychologists serving the blind and partially sighted indicated disagreement on the tests used and on the evaluation of these tests. Tests of all kinds from 45 publishers were rated, and appropriate ages and populations (blind, partially-sighted) were suggested. (CP)