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”).

The Farnsworth–Munsell (FM) 100 Hue Test is the most famous D-15 dichotomous test which was originally introduced in 1947 by Mr. Farnsworth. The D-15 test is a so called arrangement test.