Colour Vision deficiency or Colour Blindness– What is the correct term? Colour vision deficiency is the inability to distinguish certain shades of colour. The term “colour blindness” is also used to describe this visual condition, but very few people are entirely colour blind. You can use whatever name you feel most comfortable with. Some […]
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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.
The Ishihara test is a colour perception test for red-green colour deficiencies, the first in a class of successful colour vision tests called pseudo-isochromatic plates (“PIP”).
