The effects of certain illuminants on scores made on pseudo-isochromatic tests.

Abstract

The selection of pseudo-isochromatic plates and the interpretation of the scores have been decided from studies made under standard illuminants. However, color tests in the Navy are administered under a wide variety of lighting conditions. The color temperature of a number of these illuminants was measured, and two test lights were selected which represented diverse parts of the color-illuminant range: one, yellowish incandescent light, the other, standard mixed daylight. An abridged set of A.O. Plates was given to a test group under these two lights. Present acceptance-rejection standards are invalid when pseudo-isochromatic plates are administered under non-standard illumination. The administration of the plates under yellowish light-natural or incandescent--tends to cause rejection of protanomalous and acceptance of deuteranomalous applicants.