Which color vision test is a pseudoisochromatic test?

The Hardy-Rand-Ritter plates are categorized as a pseudoisochromatic test because they are designed to evaluate color vision by presenting various patterns made up of colored dots that differ in hue and brightness, which allow for the assessment of color discrimination. Pseudoisochromatic tests specifically aim to differentiate between colors by using patterns that appear to be different despite being composed of colors that are similar in appearance for individuals with normal color vision.

This testing method relies on the principle of detecting subtle differences in color perception that individuals with certain types of color vision deficiencies may not be able to see. In contrast, other tests listed, such as the Farnsworth D-15, involve arranging colored caps in a specific order and do not fall under the category of pseudoisochromatic tests. The Ishihara plates are also widely recognized as pseudoisochromatic tests with a similar purpose but the specific question asks for the Hardy-Rand-Ritter plates. The RGB color test is primarily used to assess color matching and is not designed specifically as a pseudoisochromatic evaluation. Thus, the Hardy-Rand-Ritter plates rightfully fit the criteria of a pseudoisochromatic test.