Stereoscopic performance was found to be superior for achromatic as compared to chromatic stimulus materials when observing through small pupillary apertures. When interpupillary settings were individually predetermined to eliminate chromostereopsis, chromatic stereo performance improved. A theoretical analysis of the results is presented based on the discrepancy between the optic and visual axes and the centration of the pupil. Microscope design guidance data are provided and suggestions made for improved performance in microscope viewing of chromatic materials.
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