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The role of small‐field tritanopia in two measures of colour vision
Author(s) -
Tuck J. Porter,
Long Gerald M.
Publication year - 1990
Publication title -
ophthalmic and physiological optics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.147
H-Index - 66
eISSN - 1475-1313
pISSN - 0275-5408
DOI - 10.1111/j.1475-1313.1990.tb00975.x
Subject(s) - comparability , optometry , asymmetry , sensitivity (control systems) , psychology , field of view , field (mathematics) , viewing angle , optics , computer science , computer vision , mathematics , physics , medicine , engineering , combinatorics , quantum mechanics , electronic engineering , pure mathematics , liquid crystal display
The present work extends the findings of previous efforts examining the comparability of current colour‐screening tests. Several popular tests are shown to differ greatly in the performance exhibited by colour‐normal observers as well as in their differential sensitivity to experimental manipulations of viewing duration and viewing distance. Those tests designed to identify yellow‐blue dichromacy are especially sensitive to the manipulation of viewing distance, which is interpreted as reflecting ‘small‐field tritanopia’ and the asymmetry in retinal density of the three cone types. These findings are discussed in terms of factors that influence the comparability of current colour‐screening devices and the particular need for close adherence to standardized conditions with such instruments.