Scoring the Farnsworth-Munsell 100-hue for vocational guidance.
BACKGROUND
We considered whether the color discrimination of mild color defectives scoring < or = 100 is the same as that of normals.


METHODS
We analyzed the FM 100-hue results of 126 normals and 94 congenital color defectives retrospectively by considering the Total Error Score (TES) and individual cap errors (error profiles).


RESULTS
A TES of 100 passes 95% of normals and 24% of congenital color defectives. The error profiles of some of the mild defectives who pass show abnormal peaks along a red-green axis. An error > or = 5 in these regions is a good indicator of abnormal color discrimination.


CONCLUSIONS
Some 30% of mild defectives (TES < or = 100) have limited hue discrimination in the red-green domain, so both the TES and error profiles need to be considered when providing vocational guidance.
Department of Optometry, University of Melbourne, Parkville VIC, Australia.
L E
LE
Mahon
A J
AJ
Vingrys
D000328:Adult; D003116:Color; D003118:Color Perception / Q000502:physiology*; D003117:Color Vision Defects / Q000503:physiopathology*; D004192:Discrimination, Psychological; D006801:Humans; D012372:ROC Curve; D012016:Reference Values; D014787:Vision Tests; D014830:Vocational Guidance / Q000379:methods*