Prevalence of Congenital Colour Vision Deficiency in Nigerians Living in Ugep, Cross River State

Background Colour vision deficiency (CVD), also referred to as colour blindness, is the failure or decreased ability to distinguish between certain colours under normal lighting conditions. It is an X-linked genetic disorder with varying degrees of prevalence in different populations. There is presently no report on the prevalence of CVD among students of the selected tertiary institution. Hence, the present study was aimed at determining the occurrence and genetics of CVD among students from designated tertiary institutions in Lagos state. A cross-sectional survey was employed in recruiting 1191 study subjects from three tertiary institutions in Lagos, Nigeria. Results The overall occurrence of CVD among the study participants was 2.85%. There were 24 (4.29%) males and 10 (1.58%) females affected. Among the colour vision deficient individuals, 18 (1.51%) and 16 (1.34%) were deuteranomalous and protanomalous, respectively. Also, the prevalence of CVD varies across ethnic groups of the studied subjects with the highest occurrences (3.57%) observed in the Yoruba ethnic subpopulation and the least (1.45%) among the Hausas. Conclusions More males than females were found to be colour vision deficient, and there were more deutans than protans. Early screening for CVD should be encouraged among school children to guide the choice of future profession and help mitigate work hazards resulting from being colour deficient.

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Prevalence and population genetic data of colour vision deficiency among students from selected tertiary institutions in Lagos State, Nigeria

Fakorede

Akpan

Adekoya

et al. 2022

Egypt J Med Hum Genet

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Colour Vision Defects: Awareness, Prevalence And Effects Among Secondary School Students In Imo State, Nigeria

Okeke,

Achigbu,

Dike

et al. 2024

J West Afr Coll Surg

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Background: Colour vision defect (CVD) is a public health issue with approximately one in ten males exhibiting some form of colour deficiency. Colour is used extensively in education so CVD has a dramatic impact on the learning, educational and social potentials of children. Racial differences have been reported with higher values noted amongst people of European ancestry. Objective: This study aims to assess CVDs, their magnitude and impact on the daily activities of secondary school students in Imo State, Nigeria. Materials and Methods: This was a multistage, cross-sectional, descriptive study which assessed the prevalence and effect of congenital CVD on secondary school students in Imo state using a questionnaire modified and adapted for this purpose. Colour vision was tested uniocularly for each student under bright illumination using the 38-plate Ishihara colour vision chart and Lanthony D-15 colour panel. The test was administered on a black background between the hours of 10 a.m. and 2 p.m. Results: Eight hundred and twenty-eight secondary school students were studied with a mean age of 15 ± 1.89 years. There were 468 males (57.0%) and 360 females (43%) with a male-to-female ratio of 1.3:1. There was a 3% prevalence of CVD. More males were significantly affected than females. Deutan defect was more common and none of the students had tritan defect. Conclusion: There is a low level of awareness of congenital CVD. This disorder resulted in various degrees of difficulty with colour-related school and daily living tasks. Advocacy to government and schools is needed to create awareness of CVDs and offer early counselling to those affected.

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Prevalence of Congenital Colour Vision Deficiency in Nigerians Living in Ugep, Cross River State

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Prevalence and population genetic data of colour vision deficiency among students from selected tertiary institutions in Lagos State, Nigeria

Prevalence and population genetic data of colour vision deficiency among students from selected tertiary institutions in Lagos State, Nigeria

Colour Vision Defects: Awareness, Prevalence And Effects Among Secondary School Students In Imo State, Nigeria

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