Refractive correction regulated gradient AC/A ratio with low-to-moderate myopia in children and adolescents

Abnormal accommodative convergence per diopter of accommodative response (AC/A ratio) ratio is an important factor leading to myopia. This study aimed to examine the effect of refractive correction on the gradient of AC/A ratio with low-to-moderate myopia in children and adolescents. Children and adolescents aged 8-18 years, with low and moderate myopia, were divided into groups of myopia with no refractive correction and myopic continuous refractive correction of more than half a year. Then, in accordance with the myopia gradient, they were further divided into 0.00 to - 1.50, - 1.75 to - 3.00, - 3.25 to - 4.50, and - 4.75 to - 6.00 groups. Results showed that the AC/A ratio of the myopic group without refractive correction history was significantly higher than that with refractive correction history for more than half a year. The AC/A ratio increased with the deepening of myopia in the group without refractive history of myopia. However, it decreased significantly in the group with refractive history of myopia for more than half a year. Therefore, the AC/A ratio is related to the degree of uncorrected myopia, and it increases with the degree of uncorrected myopia.