Medical experts have flagged that low public awareness of colour blindness in India leaves millions of affected individuals undiagnosed, highlighting the critical need for inclusive, structured school and workplace screenings.
Key Facts: Understanding Colour Blindness
Definition: Colour blindness, or colour vision deficiency, is a visual impairment characterized by a decreased ability to distinguish between specific colours, most commonly red-green or blue-yellow combinations.
The Black-and-White Myth: Complete colour blindness—where an individual sees the world solely in shades of black, white, and grey—is an exceptionally rare condition known medically as achromatopsia.
Genetic Transmission & Susceptibility: The most prevalent form (red-green deficiency) is a congenital condition caused by a gene mutation located directly on the X chromosome.
Gender Disparity Matrix: Because men possess only one X chromosome ($XY$), they are significantly more susceptible to inheriting the disorder, affecting roughly 8% of men compared to just 0.5% of women ($XX$) who require defective genes on both X chromosomes to manifest the condition.
Non-Genetic Acquired Triggers: While primarily a hereditary disorder, altered colour vision can develop later in life due to chronic conditions like diabetes mellitus, glaucoma, cataracts, retinal or optic nerve diseases, brain injuries, normal aging, or specific chemical medications.
Management Strategies: Genetically determined colour blindness cannot be permanently cured or reversed; however, specialized colour-filter glasses can assist some individuals in discriminating between overlapping hues.
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