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TOBACCO AMBLYOPIA AND ACQUIRED DYSCHROMATOPSIA ANOMALOSCOPE TESTS
Author(s) -
BHARGAVA S. K.
Publication year - 1973
Publication title -
acta ophthalmologica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.534
H-Index - 87
eISSN - 1755-3768
pISSN - 1755-375X
DOI - 10.1111/j.1755-3768.1973.tb06051.x
Subject(s) - hue , optometry , medicine , audiology , ophthalmology , optics , physics
The colour vision of 12 patients with tobacco amblyopia and 12 normal controls matched for age and sex was tested with the Pickford‐Nicolson anomaloscope and the Farnsworth‐Munsell 100‐Hue test. The results of the two tests were correlated (ϱ = + 0.768, P < 0.01) in that the higher the matching range on the P‐N anomaloscope, the greater is the error score on the 100‐Hue test in tobacco amblyopia. The matching range (t = 9.78, P < 0.001) and the 100‐Hue test (t = 5.43, P < 0.001) score were significantly higher than those of the controls. The acquired colour defect in tobacco amblyopia with the P‐N anomaloscope is of extreme protanomalous type ‐ the mean mid‐matching point being shifted towards the red by more than the 3 × s.d. limits for the normal controls.