Abstract: Objective To study the relationship between myopia and accommodative parameters in 9~10 years old children and explore a program for myopia treatment and prevention. Design Cross sectional study. Participants 114 children (223 eyes) aged 9~10 years, with visual acuity(VA)≤0.9 and refraction≤-0.25 D were enrolled in this study. Methods The participants were investigated a comprehensive examination including VA, slip lamp, cycloplegia refraction and fundus, amplitude of accomodation(AMP), positive relative accomodation(PRA), negative relative accomodation(NRA) and accomodative facility(AF) were measured in all children. Participants were divided into 3 groups according to the refraction: Group A (-0.25～-1.25 D), Group B (-1.50～-2.50 D) and Group C (-2.75～ -4.50 D). Data was analyzed in each group with Pearson correlation and ANOVA. Main Outcome Measures Myopia refraction, accommodation（AMP, AF, PRA, NRA）. Results The mean refractive error was -1.57±1.03 D(range:-0.25~-4.50 D). Refraction was correlate with AMP (r=0.22, P=0.001), PRA（r=-0.25，P=0.00）, and not associated with NRA(r=0.03, P=0.65), AF (r=0.06, P=0.34). Compared three groups of accommodative parameters, AMP were significant different in Group A from Group B and C (F=2.16, 2.21; P=0.00, 0.00) , and PRA were significant different in Group A from Group B and C (F=-0.45, -0.53; P=0.01, 0.02), no significant difference between Group B and C（F=0.06, -0.09; P=0.95, 0.72）. Conclusion In this survey, AMP and PRA were both correlated with myopia progression. It is supposed that visual training may improve the accommodative abnormality at the onset of myopia, and then get certain auxiliary therapeutic effect in children with partial accommodative lag. （Ophthalmol CHN, 2012, 21: 323-326）

Key words: myopia, accommodation, adolescent