International Journal of Science and Research (IJSR)

International Journal of Science and Research (IJSR)
Call for Papers | Fully Refereed | Open Access | Double Blind Peer Reviewed

ISSN: 2319-7064


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Research Paper | Ophthalmology | India | Volume 12 Issue 1, January 2023 | Rating: 5.1 / 10


To Study Prevalence and Genetic Pattern of Inheritance of Colour Vision Deficiency in School Going Children

Renuka Barki [2] | Chaitra K | Vishal [147]


Abstract: Colour Vision is the ability to discriminate a light stimulus as a function of its wavelength. Colour vision deficiency is mainly of two types. The congenital anomaly is common chromosomal abnormality with an ?X - linked recessive pattern?. The acquired causes of colour blindness, such as damage to the eyes, nerves, brain, some metabolic disorders like diabetes, glaucoma, macular degeneration, chronic illness like sickle cell anemia, toxins, drug over dose such as digoxin, barbiturates, anti TB drugs, drug side effects like sildenafil and ethambutol. Human colour vision is classified according to Young Helmholtz Trichromatic Theory. The colour vision deficiency individuals have difficulty in comprehension due to increased reaction time. The Ishihara colour test is used to determine colour blindness using different colored and patterned plates. A total of 3172 students were chosen from various schools in Davanagere from class 5th to 10th and were examined for both visual acuity and colour blindness with the help of Snellen chart and Ishihara chart respectively with standard protocol and adequate lighting. If the students were found to be colour blind, then parents and siblings of those students were asked for consent and examined by same method. The results of the study out of 3172 students 66 students were found to be colour vision deficient using the Ishihara charts 38 plate edition. Among the 66 colour defectives, males were predominantly affected 63 of 66 (95.45%) as compared to females which was 3 of 66 (4.55%) with p value <0.000 which is highly significant. Protanopia (87.88%) was more prevalent than deuteranopia (10.61%).1 girl was found to be achromatic (1.51%). After screening the parents and siblings of 31 colour defective students, males were found to be predominantly affected. Prevalence was more in consanguineous marriage when compared to non - consanguineous marriage.


Keywords: Colour Vision Deficiency, Genetic Pattern, Prevalence of CVD, School Children, Ishihara chart


Edition: Volume 12 Issue 1, January 2023,


Pages: 324 - 327


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