Farnsworth-Munsell 100 hue test

The Farnsworth-Munsell 100 Hue Color Vision Test, or Munsell Vision Test, is a test of the human visual system often used to test for color blindness. The system was developed by Dean Farnsworth in the 1940s and it tests the ability to isolate and arrange minute differences in various color targets with constant value and chroma that cover all the visual hues described by the Munsell color system. There are several variations of the test, one featuring 100 color hues and one featuring 15 color hues. Originally taken in an analog environment with physical hue tiles, the test is now taken from computer consoles. An accurate quantification of color vision accuracy is particularly important to designers, photographers and colorists, who all rely on accurate color vision to produce quality content.

The most common form of the Farnsworth-Munsell 100 Hue Color Vision Test contains four distinct rows of similar color hues, each containing 25 distinct variations of each hue. Each color hue at the polar end of a row is fixed in position, to serve as an anchor. Each hue tile between the anchors can be adjusted as the observer sees fit. The final arrangement of the hue tiles represents the aptitude of the visual system in discerning differences in color hue. Failures within the observers visual system can be measured as a function of two factors contained within the test; either the amount of instances that a tile is misplaced, or the severity of a tile displacement (i.e., the distance between where a tile should have been placed and where it was actually placed.).

The tiles are arranged in four rows based on color hue. The rows cover orange/magenta hues, yellow/green hues, blue/purple and purple/magenta hues, in that order. The physical derivative of the test is given on a black background to isolate and accentuate color hues, which are round and roughly an inch in diameter. The digital derivative of the test is based on square hue images, which are also presented on a black background, but can vary in size based on monitor, resolution, zoom and a variety of other external settings and variables. The digital distribution of the 100 Hues test is far more popular given its easy access for little or no licensing fee, and an apparent level of accuracy for most audiences. Taking the physical hue test under experimentally sound conditions (see Testing Environment) is far more accurate but the high price of the physical test kit is often prohibitive

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