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INCIDENCE OF COLOR BLINDNESS
ABSTRACT
Colour vision deficiency and colour blindness are synonymous terms describing poor colour discrimination by the visual senses. Congenital colour vision defects are common, x-linked inherited, non-progressive and untreatable disorders. Elsewhere, screening for these disorders are an established practice so that those affected can be advised about occupational preclusions. However, population-based study on the broader impact of colour vision defects is limited. A descriptive crosssectional survey was conducted using Plates 1-17 of the 2008 edition of the Ishihara’s colour album. The study was undertaken in Ugep, a rural community in Cross River State, Nigeria. A convenient sample of 1500 male and female subjects ranging from 10-60 years of age was used and the selection was based on cluster sampling. The study reveals that the prevalence of congenital colour vision deficiency in Nigerians living in Ugep is 1.87%(28 of 1500 subjects) and that of total colour blindness is barely 0.20%. The gender distribution of colour blindness in the sample 2.8% for males and 0.7% for females indicates a significantly greater frequency of defect among males than females (p<0.001,df=1). The distribution of colour blindness based on age brackets 10-20,2130,31-40,41-50,51-60 years was 16,2,1,9,0 and this reveals no sequence between age and the defect (p<0.001,df=1). The findings which serve as base line data for the area under investigation are inconsistent with Nigerian samples reported for other regions in the country but the regional variations are not accounted for. Populationbased screening for colour vision deficiency helpful for prevocational counselling is recommended.
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