The accogmmodation of adolescent myopia

Abstract

Objective To investigate the function of accommodation in adolescent myopia and study the differences of accommodation between the dominant and non-dominant eye.Methods Ninety-five subjects (50 myopes,20 emmetropes,25 hyperopes)aged 6～15 years,participated.The accommodative lag and amplitude of accommodation were assessed with their refractive errors corrected.The accommodative lags were assessed using MEM dynamic retinoscopy at 40 cm reading distance.Results 1 there were no significant differences of amplitude of accommodation and accommodative lag between the myopia group and emmetropia group.The differences of amplitude of accommodation between the myopia group and hyperopia group were significant(t=2.21,P=0.03＜0.05;t=2.83,P=0.006＜0.05).2 The difference of accommodative lag between the dominant eye(0.73±0.31)D and non-dominant eyes(0.81±0.38)D in myopia group was significant.3 The accommodative lag of dominant eyes Was(0.68±0.36)D and it of non-dominant eyes Was(0.75±0.34)D,the difference was significant(t=2.06,P=0.042＜0.05,n=95).There was no significant difference between the amplitude of accommodation of dominant eye(12.9±3.09)D and non-dominant eyes(12.6±3.09)D.Conclusion There were no significant differences ofaccommodative lag and amplitude ofaccommodation between the adolescent myopes and emmetropes.The accommodative lag of dominant eyes Was less than it of the non-dominant eye in adolescent.The differences in accommodative function of dominant and non-dominant eyes should be mentioned. Key words: Adolescent; Myopia; Accommodation