Ferree, Clarence Errol, Rand, Gertrude, b.1886 · New York, etc. · leaf 61
tion of stimulus and background was with the minuteness and precision chosen because of the frequency of its needed both for laboratory and diag- use in clinical work. nostic purposes, a single value or in- The results contained in these tables dex must be had ; which can be taken may be summarized… … white field (10 observers). stimuli on stimuli on a black field (10 observers).
Ophthalmology · Vision · Color vision
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