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Summary Out of 292 boys and 272 girls tested for colour blindness in Andhra Pradesh 22 boys and one girl were judged to have abnormal colour vision. Difficulties in classification are emphasized. We are grateful to Dr H. Kalmus for his advice on the classification of abnormals and to Dr H. Spurway for criticizing the manuscript.
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Dronamraju et al. (1961) studied this question.
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