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23 total sentences available.
He considers that color is conveyed to the mind through a perceptive centre, and that this centre is only able to distinguish six definite points of difference (colors) in the spectrum. Therefore, for normal sight, he holds a hexachromatic theory of color-vision which is independent of light and shade.
Source: wiktionary
Dr. Edridge-Green has classified colour-blind people according to whether they can perceive sis colours, five, four, three, two, or only one colour. Thus, one who distinguishes all six colours, or a hexachromatic person, may be considered as normal.
Source: wiktionary
It is worth noting that in 1891 Dr. Edridge-Green, of St. John’s College, put forward the view, in his Colour Blindness, p. 103, that whereas normal vision is hexachromatic, there are persons who emphatically distinguish seven colours in the spectrum, exactly as did Newton—or rather the assistant on whom Newton always relied.
Source: wiktionary
Most of us, they assert, are “hexachromatic”. We see red, orange, yellow, green, blue, and violet.
Source: wiktionary
Showing 4 of 23 available sentences.
Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.