Ferree, Clarence Errol, Rand, Gertrude, b.1886 · New York, etc. · leaf 10
C. E. FERREE AND GERTRUDE RAND 300 sented In solid black; in case there is only a marked depression of sensitivity the area is shaded. In this latter case areas are represented only when the depression of sensitivity amounts nearly to blindness. They were, for example, so insensitive that the color… … IBO Chart II Showing for Observer C the Areas of the Peripheral Retina having the Schumann Type of Color Blindness. The conditions of investigation and method of repre- sentation is the same in this chart as in Chart I. The results for Observers R and C are selected for presentation here because of…
Ophthalmology · Vision · Color vision
Internet Archive · University of California Libraries · Public domain (published before 1931). Free to use for anything.
