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PubMed1977

[Dyschromatopsia].

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Color Perception Tests↗
PubMed1978

Temporal variations in anomaloscope equations.

Temporal variations in the value of blue/green derived from the equation: 'Blue' + 'Green' = 'Cyan' + 'Yellow', seem to be of two kinds. Those found in a cross-sectional study of 167 normal eyes in the age range 13--83 years could be attributed to progressive changes in lens absorbance. Individual cyclic variations in short-term (12 h) and long-term (11 months) longitudinal studies could not be attributed to the lens.

Adolescent↗
PubMed1978

Further observations on the extramacular chromatic mechanisms.

Monochromatic targets presented at 30 degrees excentricity on orange, magenta and blue backgrouds are used. A small monochromatic light, 476 nm on orange, 551 nm on magenta and 621 nm on blue, is flashed at 3 cps-1 on the centre of the targets. The size of the targets is varied and their luminance adjusted using neutral filters until the flashing light is just not visible. This method allows the study of chromatic mechanism sensitivity and of retinal interactions (summation and inhibition). Some observations in normal as well as in pathological conditions are presented.

Adult↗
PubMed1978

Color matching and Stiles-Crawford effect in central serous choroidopathy.

Color matching and Stiles-Crawford effect measurement were performed in 3 patients with central serous choroidopathy, 2 normal and 1 deuteranomalous trichromats. The color matches in the affected eye of each patient were displaced to red and could be explained by the hypothesis that the visual photopigments are in reduced optical density due to receptor disorientation caused by serous elevation of the sensory retina. The Stiles-Crawford effects of the affected eyes was abnormal confirming the hypothesis of receptor disorientation. The type III color defect accompanied by pseudo-protanomaly ascribable to receptor disorientation as occurs in central serous choroidopathy may be differentiated from the type III defect without pseudo-protanomaly.

Absorption↗