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Mean ocular rotational center of 38 orbits of 19 normal subjects monocularly fixating targets in 29° ab- and 34° adduction, and 8 orbits of 7 subjects in 21° convergence. The horizontal center was significantly lateral to globe center in abduction but significantly medial in adduction (P < 0.02, 2-tail t-test), while its significantly (P < 0.02) anterior location did not vary appreciably with rotation direction. The rotation center in convergence was farther medial than in adduction.
