Document Detail

Color vision testing with a computer graphics system: preliminary results.
MedLine Citation:
PMID:  3168720     Owner:  NLM     Status:  MEDLINE    
We report a method for computer enhancement of color vision tests. In our graphics system 256 colors are selected from a much larger range and displayed on a screen divided into 768 x 288 pixels. Eight-bit digital-to-analogue converters drive a high quality monitor with separate inputs to the red, green, and blue amplifiers and calibrated gun chromaticities. The graphics are controlled by a PASCAL program written for a personal computer, which calculates the values of the red, green, and blue signals and specifies them in Commité Internationale d'Eclairage X, Y, and Z fundamentals, so changes in chrominance occur without changes in luminance. The system for measuring color contrast thresholds with gratings is more than adequate in normal observers. In patients with mild retinal damage in whom other tests of visual function are normal, this method of testing color vision shows specific increases in contrast thresholds along tritan color-confusion lines. By the time the Hardy-Rand-Rittler and Farnsworth-Munsell 100-hue tests disclose abnormalities, gross defects in color contrast threshold can be seen with our system.
G Arden; K Gündüz; S Perry
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Documenta ophthalmologica. Advances in ophthalmology     Volume:  69     ISSN:  0012-4486     ISO Abbreviation:  Doc Ophthalmol     Publication Date:  1988 Jun 
Date Detail:
Created Date:  1988-11-15     Completed Date:  1988-11-15     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0370667     Medline TA:  Doc Ophthalmol     Country:  NETHERLANDS    
Other Details:
Languages:  eng     Pagination:  167-74     Citation Subset:  IM    
Electrodiagnostic Dept. Moorfields Eye Hospital, London, UK.
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MeSH Terms
Color Perception Tests / instrumentation,  methods*
Computer Graphics*
Diabetic Retinopathy / physiopathology
Grant Support
1RO1 EY05 984-01A1/EY/NEI NIH HHS

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