The Amounts of Horizontal Ocular Movement in Korean People and Comparison According to Methods of Measurement

ABSTRACT

PURPOSE: To estimate and standardize horizontal ocular movement of normal Korean people and, to adapt correlations among three Methods for clinical approach. METHODS: This study investigated the amounts of horizontal ocular movement in normal Korean people whose age was ranged from 20 to 79 (50 persons in each age decades) by the lateral version light reflex Method, the limbus test of motility and the imaginary vertical line Method, and compared relationships among the amounts measured with above three Methods by Spearman correlation coefficient. The study subjects were three hundred people who visited Dept. of Ophthalmology at Gyeongsang National University Hospital, whose best corrected visual acuity was no less than 20/50 Snellen visual acuity chart, who had no history of ophthalmic operation and diseases, whose age was ranged from 20 years to 79 years (50 persons in each age decades). RESULTS: In imaginary vertical line Method, the excessive ocular movements were more frequent in younger people than in elder people. With age the proportion of the excessive ocular movement was gradually decreased and that of the normal ocular movement was increased until 6th decades. With other two Methods, the amounts of horizontal ocular movement was higher in younger ages than in elder ages and they decreased with aging. There were significantly moderate correlation (rs = - 0.54 to - 0.64) between age and ocular movement, and high correlation (rs = 0.79 to 0.86) among ocular amounts measured with imaginary vertical line Method, the lateral version light reflex test, and the limbus test of motility of Kestenbaum. CONCLUSIONS: This study suggests that any Method of three is reliable clinically.