The purpose of this experiment is to evaluate whether color is the critical factor in seeing a given test object, or whether the absolute energy, independent of color, determines field size. This paper discusses the relationship of central field size obtained with colored objects as compared with white test objects reflecting light of equivalent energies or intensities.
One hundred and fifty central field examinations were performed with white, green, blue, and red test objects. The subjects tested were adults with no color deficient vision or other ocular abnormalities. The perception of an object rather than the discrimination of color was used as an end point.
Apparatus and Procedures
In order to obtain valid comparisons of the effect of equal energies on field size, a lighting system was needed which could vary the intensity of the light without varying the quality of the light, i.e., without changing color. Further, this lighting
BERK MM. A Critical Evaluation of Color Perimetry. AMA Arch Ophthalmol. 1960;63(6):966-977. doi:10.1001/archopht.1960.00950020968011