The use of colour difference vectors in diagnosing congenital colour vision deficiencies with the Farnsworth—Munsell 100‐hue test

Abstract

Colour difference vector analysis provides useful and meaningful information in scoring the Farnsworth–Munsell (FM) 100‐hue test. However, the FM 100‐hue test is limited in its ability to diagnose type and severity of congenital colour vision defect. Type classification for all subjects is incorrect in 21% of cases, and for deuteranomals the misclassification rate is 38%, Visual inspection of the plots yields a similar misclassification rate and classification of plots with few errors (under 180) is generally less reliable. The FM 100‐hue test has a limited ability to separate dichromats from anomalous trichromats. A test protocol based on joint DI5 and FM 100‐hue tests should pass 36% of an..