Analysis of the anterior segment of the eyes of adolescent myopes when accommodation is induced by different reading distances

Objective To discuss the changes in the anterior segment of the eyes of adolescents with different degrees of myopia when accommodation is induced by different reading distances. Methods Ninety-five myopic subjects and 34 emmetropic subjects ranging in age from 14 to 18 years were enrolled in the study. Measurements were taken of every subject under different levels of accommodation (0 D, 3 D, 6 D) and included refraction with an MPMVA, accommodative amplitude, anterior chamber depth, crystalline lens thickness and pupil diameter with the Visante OCT. SPSS11.5 statistics software was used for analysis. Results 1Pupil diameter significantly decreased in the dark with an increase in the degree of refractive error. There was no significant difference in crystalline lens thickness between each group but there was a significant difference in anterior chamber depth. 2With a decrease in reading distance and an increase in accommodation, anterior chamber depth significantly decreased in all groups; crystalline lens thickness significantly increased; and pupil diameter significantly decreased in the dark. 3With an increase in the degree of myopia, under an accommodation of 3 degrees, anterior chamber depth significantly decreased for all groups; crystalline lens thickness significantly increased; while pupil diameter did not significantly change in the dark. 4With an increase in the degree of myopia, under an accommodation of 6 diopters, anterior chamber depth significantly decreased in all groups; crystalline lens thickness significantly increased; and pupil diameter significantly decreased in the dark. Conclusion In adolescents, with an increase in the degree of myopia, a decrease in reading distance and an increase in accommodation can significantly induce a decrease in anterior chamber depth and an increase in crystalline lens thickness. Under an accommodation of 6 D, pupil diameter significantly decreased in the dark with an increase in the degree of myopia.