Abstract
A comparative study of conservation development in partially sighted, sighted, and sighted blindfolded children at four age levels (6–7, 8–9, 10–11, and 12–15 yrs.) was assessed. Conservation on tasks of mass, weight, and volume were evaluated using Piaget and Inhelder's (1941) prediction, judgment, and explanation questions. The significant differences were found between groups, task, and age level. Visually impaired children's performance was inferior to sighted children at all age levels, while little difference was found between partially sighted and blindfolded children's performance. For all three groups, conservation of mass was easiest, followed by conservation of weight, then volume. The findings support the notion of a developmental lag in cognitive skills for partially sighted children.
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