What is Colour Colour Vision Deficiency?
Colour vision deficiency, also known CVD or colour blindness, is a vision condition that affects your eye’s ability to see certain colours. Most people who have colour blindness can see some colours, but the type they have will affect how their eyes interpret secondary or tertiary colours.
For example, people with red-green colour blindness might have difficulty seeing the “red” in colours like orange or purple.
Colour blindness is caused when light-sensitive cells, known as photopigments, fail to read certain wavelengths of light that provide your colour vision.
There are 3 different categories of colour blindness. Some also have different types that cause them: