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🌈Colour Blindness (Colour Vision Deficiency) 🔹 Vision 20 20 | Mamta Verma (Optometrist) 🟡 What is Colour Blindness? Colour blindness means difficulty in identifying certain colours—mostly red, green, or blue. It happens when the cone cells in the retina do not work properly. 🔹 Types of Colour Blindness Red-Green Colour Blindness (most common) Blue-Yellow Colour Blindness Complete Colour Blindness (Achromatopsia) – very rare 🔹 Causes Genetic (present from birth) Optic nerve diseases Cataract

The Colour Assessment and Diagnosis (CAD) test is a newly developed test for colour vision deficiency in pilots. The CAD test is completely sensitive and specific for the identification of normal colour vision and the test is able to accurately and repeatably quantify the degree of colour vision loss in individuals with colour vision deficiency. The pass/fail criteria are based on the point at which the degree of deficiency degrades performance in critical piloting tasks, the most critical task