Abstract
The synergistic and harmonic functions of retina, optic nerve, part of thalamus and visual cortex are essential for the perception of color: human color vision is trichromatic i.e. the mixture of red, green and blue lights. The present cross-sectional study was conducted in August to October 2018. The ethical approval was obtained from Institutional Review Committee (IRC) of Nepal Medical College. After obtaining consent from the participants, the study was carried out among health science students of age group 18-25 years at Jorpati, Kathmandu, Nepal. The number (n) of sample size was 300; (male, n=150, female, n=150). The assessment of color blindness was done with the help of Ishihara Chart (“Ishihara Type Tests for Color Blindness”-38 plates (2002) Eye Care- Ludhiana, India). Among the study group (male, n=150, female, n=150), the color deficiency were found in male participants only; n=7, which is 2.33% of total participants (n=300). None of the female participants were found to be color blind/weak. Among the color deficient (n=7), protanomaly detected in 1, deuteranomaly in 2 and deuteranopia in 4. Hence, the present students of health stream are future health workers, whose observation apt to clinical examination is instrumental to treat patients; therefore, they must be aware and circumspect of their color vision to discharge their duties to the patients in a better way.
Highlights
Retina consists of red-sensitive L, green-sensitive M, and blue-sensitive S cones each containing a different photopigment and that are maximally sensitive to red, green and blue light respectively.[1]
The present students of health stream are future health workers, whose observation apt to clinical examination is instrumental to treat patients; they must be aware and circumspect of their color vision to discharge their duties to the patients in a better way
The synergistic and harmonic functions of retina, optic nerve, part of thalamus and visual cortex are essential for the perception of color
Summary
Retina consists of red-sensitive L, green-sensitive M, and blue-sensitive S cones each containing a different photopigment and that are maximally sensitive to red, green and blue light respectively.[1]. Human color vision is normally trichromatic i.e. the mixture of red, green and blue lights.[3]. Color vision defect may be congenital or acquired.[6] Red-green perceptive disorders (protan-deutan) are X-linked recessive, but blue color perceptive disturbance is caused by a simple mutation in gene coding for blue receptor on chromosome 7.7 Blue perceptive disorders (trit) is rare and shows no sexual selectivity.[2] whereas; the acquired deficiencies are caused by ocular and intracranial pathologies,[6] drugs, diabetic retinopathy, hypertension, glaucoma, macular degeneration and yellowing of the lens due to ageing.[8,9]. The assessment of color blindness was done with the help of Ishihara Chart (“Ishihara Type Tests for Color Blindness”-38 plates (2002) Eye Care- Ludhiana, India). All the collected data were compiled and analyzed using Excel
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