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THE EFFECT OF WAVELENGTH ON STEREOACUITY*

ABSTRACT Stereoacuity for small, parafoveal targets as a function of difference in chromatic stimuli was determined successively with narrow band red, green and blue targets. Apparatus was a modified Howard‐Dolman type needle alignment device with micrometer drive capable of accurate discriminations to ±0.05 mm. Fluorescent targets emitted narrow bandwidth spectral energy with peaks near 623, 546, and 450 nm, respectively. Results indicate a systematic difference in stereoacuity under the influence of chromatic stimulus changes. Acuity with blue stimuli was lowest for all subjects; relative acuity levels for red and green varied from subject to subject.