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We examined how binocular disparity works in the periphery. In Experiment 1, we measured how participants Estimate the depth and size of a target presented at up to 17.5 degrees while focusing on a fixed point, in the conditions of three different binocular crossed and uncrossed disparities within the fusion area. In experiment 2, both depth and size perception were tested with the target presented at 5 degrees above or below the horizontal plane at the peripheral field of more than 10 degrees, checking the effect of a blind spot. In Experiment 3, the same stimuli as in Exp. 1 were presented but estimated with voluntary eye movement. The results showed that binocular depth perception was possible up to 15 degrees with the eyes fixed as well as with ocular movement but the depth effect on size clearly decreased. They suggested binocular stereopsis is maintained considerably in the peripheral field.

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