99% of all colourblind people are not really colour blind but colour deficient; the term colour. Red-green colour blindness is a combination of red-blindness (protan defects) and green-blindness (deutan defects). Colour blindness is more prevalent among males than females, because the most common form of colour vision deficiency is encoded on the X sex chromosome. “What colour is this?” is the most annoying question you can ask your […]
People with a colour vision deficiency are able to see things as clearly as other people but they get confused with shades of Reds and Greens. There are different types of colour blindness and there are extremely rare cases where people are unable to see any colour at all. Some people think traffic lights are an issue for everyone suffering from a […]
There are four types of tests currently available to test for IrochromaticTM (colour blindness). The purpose of the Waggoner HRR (Hardy Rand Rittler) is to determine if an individual has a colour vision deficiency.
Richmond Products, a US‐based manufacturer of ophthalmic equipment, published this test in 1991. It still works on the principles of the Hardy Rand Rittler original test, but has been revised.
