Comparison of Stere oacuity between Crossed and Uncrossed Disparities in Dynamic Stereoacuity

ABSTRACT

Demonstration of an overall superiority in the accuracy of discriminating crossed-disparity targets should be noted as opposed to uncrossed-disparity targets.We investigated the difference in stereoacuity between crossed and uncrossed disparities using dynamic stereoacuity and superiority of crossed disparity stereopsis.We examined dynamic stereoacuity in 73 normal subjects at 120 cm test distance and 96 subjects at 150 cm test distance.At 120cm test distance, the mean dynamic stereoacuity of crossed disparity was 313.4 +/-261.4 (mean +/-standard deviation)sec of arc, and, the mean dynamic stereoacuity of uncrossed disparity was 343.1 +/-261.4 sec of arc.At 150 cm test distance, the mean dynamic stereoacuity of crossed disparity was 263.2+/-196.8 sec of arc, and, the mean dynamic stereoacuity of uncrossed disparity was 310.6 +/-310.6 sec of arc.Statistical significance shows a higher stereoacuity of crossed disparity than uncrossed disparity in both test distance (Wilcoxon matched pairs signed ranks test, p<0.05).