Colour blindness impairs one's capacity to discern between different colours. This is most common between greens and reds, but it can also happen with blues. Colour blindness is a hereditary disorder caused by a variation in how one or more light-sensitive cells in the retina of the eye respond to different hues. These cells, known as cones, detect light wavelengths and allow the retina to discriminate between hues. Consult with the khatib Eye clinic Team to know more.