| Autor: |
Sweeney, Donald R., Zegers, Richard T., Collins, William E. |
| Předmět: |
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| Zdroj: |
Journal of Social Psychology; Feb1964, Vol. 62 Issue 1, p85-91, 7p |
| Abstrakt: |
A sample of 1137 Negro males between the ages of 6-15 were classified according to type and degree of color-vision defect. The Hardy-Rand-Rittler Pseudoisochromatic Plates and a Schmidt-Haensch anomaloscope were used. Findings may be summarized as follows: 1. The H-R-R Plates classified 75 subjects (6.77 per cent) as red-green color deficient. Anomaloscope testing reduced this number to 34 (2.99 per cent), a general incidence which closely approximates that reported by other investigators. 2. The discrepancy between the two tests is primarily due to (a) a disproportionate number of screening-plate failures at the lowest age levels, and (b) subject difficulties with a single screening plate (Plate 1). 3. The Negro sample yielded no protanopes and proportionately more protanomalous trichromats than reported for Caucasian groups, although total incidence of color defect is about three times greater in the latter population. 4. Two subjects (.18 per cent) were classified as blue-yellow defectives. This represents an incidence about 900 times greater than that estimated for Caucasian populations. The results indicate that Negro populations are a more fruitful source of blue-yellow color defectives, and that an age factor may be important in color-vision screening tests. With respect to the latter, follow-up studies of very young children diagnosed as color-blind should be conducted. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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