Abstract
The percentage of color deficiency (assessed by Ishihara pseudoisochromatic plates) among secondary school students from the Veneto, Emilia-Romagna and Apulia regions of Italy (1,557, 1,505 and 1,726 subjects, respectively) was found to be 2.95, 3.19 and 3.19%. The rate of colour deficiency was higher for the male sample (4.92, 5.71 and 4.52% for the Venetians, Emilians and Apulians, respectively) than for the female sample (0.69, 0.0 and 1.71%). An analysis for detecting the various forms of color deficiency (assessed by the Farnsworth dichotomous D-15 test) revealed 1/1, 1/1.3, and 1/3 protan/deutan ratios for the Veneto, Emilia-Romagna and Apulia regions, respectively. The overall rate of color deficiency in our entire sample of 4,788 subjects was 3.11%. This is below the rate previously found by Kherumian et al., (1959), but it is in accordance with percentages of color deficiency known for some other Mediterranean populations.
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