AIM:To study the relationship between the AC/A ratio and myopia in children. METHODS:All the subjects were divided into emmetropia group and myopia group which were divided into three groups(mild myopia,moderate myopia,high myopia) according to the degrees of myopia. The AC/A ratio was measured with a synoptophore,and the results were compared. The status of wearing glasses were followed up and divided into three groups:continued wearing glasses,non-wearing and discontinuous wearing,each with 30 cases.RESULTS:The AC/A ratio was higher in the myopic groups than in the control group. AC/A ratio of the high myopia group was higher than that of mild to moderate myopia group; AC/A ratio of continued wearing glass group was lower than that in non-wearing glass group and in discontinuous wearing glass group.CONCLUSION:The anomaly of AC/A ratio in children of uncorrected myopia seems to be an adaptatio to the incoordination of regulation and collection. And the increase of AC/A ratio can lead to an aggravation of myopia.The disharmonious relationship between converge and regulation can be readjusted. AC/A ratio decrease gradually.