This study was designed to determine the effect on stereopsis of interocular retinal chromatic and illuminance imbalance in 30 subjects with normal binocularity. A Randot Circle Stereotest viewed through polarizing glasses was the control condition. In each of the other three conditions, illuminance and chromatic imbalances were created by combinations of neutral density filters, red and green filters, and polarizing filters. The effect of each of four experimental conditions on stereopsis was determined by comparing total stereo judgement errors on the Randot Circle Stereotest. Total average flux through the filter combinations was held constant by adjusting the luminance level of light reflected from the target. The chromatic imbalance created by the red-green filters significantly increased the number of stereo judgement errors (37%, p < 0.05); however, the illuminance imbalance (0.2 log units) created by the red-green filters did not significantly increase the number of errors (2.9%, p < 0.65); finally, the combined illuminance and chromatic imbalance created by the red-green filters significantly increased the error frequency (46%, p < 0.05). The chromatic imbalance caused by red-green glasses significantly degrades stereopsis, whereas the illuminance imbalance caused by these filters has little effect on stereopsis.
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