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.