The most common form of colour blindness and is a decreased sensitivity to red-green colours making green look red.
Less receptive to red colours and makes red, orange, and yellow look more green.
Reduced sensitivity to blue-yellow colour. Makes it difficult to distinguish between blue and green and between yellow and pink.
There are many different tests available to test for the different types of colour blindness. At Oscar Wylee, our optometrists use the Ishihara Test, the most commonly used test to check for red-green colour vision deficiency.
It uses images or “plates” made up of various sized coloured dots in two or more colours and requires you to detect a number or line within the dots. If you have trouble seeing red and green, those numbers will be difficult to see or may not be seen at all.