A review of research on intelligence testing with blind persons is presented. Comparisons between sighted and various visually impaired groups are made. The relationship between intelligence and blind subgroups is analyzed: Congenital and adventitious, degree of vision, visual diagnosis, attendance at residential versus public schools, length of education, family and social status. While sighted and visually impaired groups are similar in mean IQ scores, evidence was found to support the notion of intellectual factors that are differentially developed in the blind. Subgroup comparisons within the blind population suggest differences on the basis of age, education, and damage to the central nervous system.
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