Normal Range of Ocular Ductions in Various Age Brackets by Prism Shifting Light-Reflex Test.

PLR test is a new technique for ocular duction measurement. Supraduction had the smallest range of ductions followed by adduction, abduction, and infraduction. Aging has the largest decremental effect on supraduction and the smallest decremental effect on infraduction. The normative values of ocular ductions by age in each decade were established.