Fundamentals of Anomaloscope

Abstract

An anomaloscope is a test device for diagnosis of congenital color vision deficiencies using a 2° 10' circular bipartite target for color matching. The test subjects perform tasks involving color matching between mixed red (670nm) and green (545nm) light in the upper half of the circular target and yellow light (588nm) in the lower half of the target. Dichromats can perform color matching completely between the two halves, because the red, green and yellow lights are selected from the spectral loci where the confusion color lines of type 1 and type 2 color defectives are parallel. In this report, the chromaticity diagram, confusion color lines and fundamentals of an anomaloscope are presented. A single-view anomaloscope is proposed to prevent chromatic adaptation, which is the biggest problem of a conventional anomaloscope.