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Document Type

Research

Abstract

The study has shown that there is an appreciably greater frequency of defective color vision among the mentally retarded children in the counties specified than that found in normal children. The general objective of this study was to determine the frequency of color blindness among mentally retarded children in an area of northwest Iowa. The subjects were children in fifteen special education classes for the mentally retarded. The Hardy-Rand-Ritter Pseudoisochromatic plates for detecting, classifying, and estimating the degree of defective color vision were used in this study. The author in all cases did the examining.

Publication Date

1964

Journal Title

Proceedings of the Iowa Academy of Science

Volume

71

Issue

1

First Page

418

Last Page

420

Copyright

© Copyright 1964 by the Iowa Academy of Science, Inc.

Language

EN

File Format

application/pdf

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