🌈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