Abstract

We have previously discussed how to express FM 100-hue test data in an S-cone discrimination space (Pokorny et al, 1990; Yeh et al, 1991). Here we extend this endeavor to L- and M-cone mediated discriminations. Additionally, we now include a variety of arrangement tests, including the FM 100-hue test, the Farnsworth Panel D-15, the desaturated Panel D-15d, and the Lanthony New Color Test. The rationale for this work lies in the observation that chromaticity discrimination is economically described (Boynton & Kambe, 1980) within the framework of the MacLeod & Boynton (1979) cone excitation space. Physiological studies in the macaque indicate that at the retinal ganglion and lateral geniculate level, chromatic processing is organized in the Parvocellular processing stream. Two major classes of cells show discrimination on two independent "cardinal axes" (Derrington et al, 1984). The macaque Parvocellular and the human cardinal axes are closely similar (Krauskopf et al, 1982). The majority of acquired color defects seen by clinicians arise from retinal or optic nerve disorders. Thus errors should develop along the major axes of cone excitation space. The purpose of this talk is to describe how the error scores on arrangement tests can be related to chromaticity discrimination mediated by relative L-cone discrimination.

© 1992 Optical Society of America