An introduction to the study of colour vision (1915)
Parsons, John Herbert, Sir, 1868-1957 · Cambridge [Eng.] University Press; New York, G. P. Putnam's Sons · leaf 86
S 69 The limits of the colour fields vary not only with the intensity ofthe light, but also with the saturation of the colour, and, above all,the size of the object. If these are sufficiently great colours may berecognised, almost, if not quite, at the extreme periphery (Bonders,Landolt). As… … 70 Fig. 24. Perception of colours in different parts of the field of vision. Abscissae, de-grees to the nasal side of the fovea {O) ; ordinates, maximum distance at which the colouris perceptible in a coloured paper 2 mm. square. (Charpentier.) Ordinary observations with the perimeter do not afford…
Color vision
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