Abstract
An analysis of large-field spectral matches in dichromats, using the projection anomaloscope, had the following results: no deuteranope remained a dichromat. The majority behaved like deuteranomalous observers, whereas the matches of the rest approached the normal range. Almost all protanopes became protanomalous. A ‘large-field-protanope’ seemed to be a very rare exception.
Family studies brought some new information: Protanopie brothers who showed no difference between monocular and binocular observations using the foveal fixation field had clear-cut protanomalous equations in the large field with binocular observation, whilst monocular observation, but still protanomalous, allowed a wider matching range. A deuteranopic man became, as usual, deuteranomalous in large field. His sister was also deuteranopic on the Nagel anomaloscope, but in the large field her equation resembled the normal trichromatic match. The situation of two affected x-chromosomes may be the cause. The large field match of two deuteranopic brothers was shifted beyond the normal equation in the direction of protanomaly, but with normal luminosity values. The influence of the Pokorny-Smith effect is discussed.
Population studies comparing genotypic and psychophysical findings have to take the colour vision in the large field into account.
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Jaeger, W., Krastel, H., Marat, G. (1991). Large field spectral matches in dichromats. In: Drum, B., Moreland, J.D., Serra, A. (eds) Colour Vision Deficiencies X. Documenta Ophthalmologica Proceedings Series, vol 54. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-3774-4_2
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DOI: https://doi.org/10.1007/978-94-011-3774-4_2
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