Colour Vision Deficiencies VII pp 147-154 | Cite as
Dichromatic and Anomalous Trichromatic Colour Vision Examined with Small and Large Field Matches by Means of the Projection Anomaloscope
Abstract
A recently developed projection anomaloscope (Jaeger et al. 1982) served to generate small (minimum ca 1°) and large field (maximum ca 30°) Rayleigh matches under otherwise identical conditions. The four types of colour defectiveness could be differentiated with regard to their typical matching positions and ranges, and their slope of luminance, at the projection anomaloscope as well as at the Nagel device. Normal and anomalous trichromates exhibited, apart from a slight shift towards red in large field conditions, consistency of matches independent from the test field diameter. Dichromats, however, showed marked shrinking of matching range in large field conditions, where they behaved like the respective anomalous trichromats. The only exception was a veritable large field protanope. The results argue in favour of the hypothesis that anomalies and anopias share a common photochemical basis: the anomalous pigment. But it is likely to assume that, in dichromatism, the number of the respective anomalous cones is sharply reduced. This assumption would fit in the genetic rule that anomaly, extreme anomaly and anopia are multiple alleles.
Keywords
Field Size Large Field Peak Transmission Colour Vision Deficiency Normal TrichromatPreview
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