Date of Award
6-1933
Document Type
Thesis
Degree Name
Master of Science (MS)
First Advisor
Dr. J. A. Glaze
Keywords
color-blindness
Abstract
Although it is probable that no two individuals perceive colors in exactly the same way, it is known that there are some who deviate radically from the majority in this respect, and for this reason are called "color-blind". There are three principal types of the defect -- red-green, blue-yellow, and total color-blindness, with possible gradations intervening. Red-green color-blindness is the most common, and is the type with which we shall be concerned in the present investigation. The origin of the problem was due largely to the fact that the writer is color-blind to red and green.
Without speculating as to the sensations of the color-blind, we can best define the defect in terms of the confusions made. A red-green color-blind individual is one who is unable, due to an anomaly of the cerebroretinal apparatus, to tell with certainty whether any given hue is reddish or greenish. The normal person would be unable to make such a judgement in the case of a hypothetically pure yellow or pure blue, but the red-green color-blind individual is unable to do so in any case.
Not all of the reds and greens appear as grays to the color-blind, but only those which cannot be described as being somewhat yellowish or bluish. In cases where the condition approaches total color-blindness there are greater numbers of the reddish and greenish hues which are perceived as grays.
Red and green do not look alike to the red-green color-blind except under the following psychological conditions: (1) The yellow content, or the blue content must be equal. (2) The saturation must be the same. (3) The brightness must be the same.
Red-green color-blindness has been subdivided into protanopia and deuteranopia. Because of criticism by the more modern writers1, these terms will not be used in the present work, although it is not implied that the classification is entirely without value.
Purpose
The purpose of this investigation is to find whether or not there is a valid method by which the red-green color-blind can be aided in the discrimination of colors, and to determine approximately to what extent such a method is effective.
[Taken from introduction]
Recommended Citation
Portrum, Donald Charles, "A Supplementary Method of Color-Discrimination for the Red-Green Color-Blind" (1933). Electronic Theses & Dissertations. 689.
https://digitalcommons.pittstate.edu/etd/689
