Frequency of Colour Blindness among East Kentish Children

Abstract

AN investigation of the frequency of colour blindness among East Kentish children was made in connexion with research sponsored by the Department of Child Development, Institute of Education, University of London. The Ishihara Test (second edition: 24 plates) was used under north daylight conditions, and all the children in five schools were tested. Two of the schools were in the city of Canterbury, two in agricultural communities and one in a Kentish coalfield village. The children ranged in age from 4.5 to 11.0+ years. “Colour blind” responses to 12/16 plates of figures and/or all the “path tracing” plates were required for a diagnosis of colour blindness. The frequencies found were as shown in Table 1.