ERIC Number: ED044044
Record Type: Non-Journal
Publication Date: 1969-Nov
Reference Count: N/A
Visual Discrimination of Color Normals and Color Deficients. Final Report.
Since visual discrimination is one of the factors involved in learning from instructional media, the present study was designed (1) to investigate the effects of hue contrast, illuminant intensity, brightness contrast, and viewing distance on the discrimination accuracy of those who see color normally and those who do not, and (2) to investigate the extent to which the discrimination accuracy of color deficients improves, as compared with that of color normals, as a function of brightness contrast. Color deficiencies of two types--deuternopia (green blindness) and protanopia (red blindness)--were represented by six children each in the experiment. With six color normals, they were paid to discriminate the orientation of the gap in chromatic rings presented on chromatic surrounds. The degrees of hue contrast in Part I of the study were 36, 72, 108, 144, and 180 on the Munsell Hue Circle. The illuminant intensities were 25, 50, 75, and 100 footcandles. Viewing distance was 3 meters. Brightness contrast in Part II of the study had four values between 30 and 80 percent. Illuminant intensity was 50 footcandles, and viewing distances were 5, 6, 7, and 8 meters. On the evidence of the study the recommendation is that a brightness contrast of 30 percent or more be provided in colored instructional materials. (MF)
Publication Type: N/A
Education Level: N/A
Sponsor: Office of Education (DHEW), Washington, DC. Bureau of Research.
Authoring Institution: Indiana Univ., Bloomington. Audio-Visual Center.