An initial Ishihara color vision test is available to anyone online, but for the more advanced color vision test, a patient must visit an optician, according to Colour Blind Awareness. As of 2014, the Farnsworth-Munsell 100 Hue Test is the most advanced test available, as noted on PubMed.
The Farnsworth-Munsell 100 Hue test is time-consuming and is usually not given unless initial color blind symptoms are present, states PubMed.
Color blindness occurs in some patients when they cannot distinguish between two separate colors, explains MedlinePlus. The most rare, and most severe type of color blindness is known as achromatopsia. Patients with achromatopsia can only see shades of gray.