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 97
y each quarter of the area is thusequivalent to a quarter of the intensity of light. Any aperture subtendingmore than 5° will give the same field. Guilleryi confirmed Hesss results by using the size of the areastimulated as a guide to the size of the colour fields. For each coloura gradual increase… … 0 I 2 Z }■ 5 6 Aperture in powers of - Z Fig. 33. The temporal ( ) and nasal (- ) limits of the fields of vision for four spectral colours for different areas of stimulation. (Abne}.) The general threshold of light at the periphery is difficult to measure.Abney used a small spot of luminous paint…
Color vision
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