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 95
each quarter of the area is thus equivalent to a quarter of the intensity of light. Any aperture subtending more than 5° will give the same field. Guillery1 confirmed Hess's results by using the size of the area stimulated as a guide to the size of the colour fields. For each colour a gradual… … dpcrture 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. (Abnej'.) The general threshold of light at the periphery is difficult to measure. Abney used -a small spot of luminous paint for…
Color vision
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