The comparision of response AC/A with different refractive error

Abstract

Objective To discuss the differences in the response AC/A between progressive myopes,stable myopes and emmetropes,and to try to analyze the causes for the differences.Methods Fifty-one subjects (17 progressive myopes,17 stable myopes and 17 emmetropes) participated in the study.The accommodative response and heterophoria were measured under 9 different stimulus states.And the response AC/A and accommodative error index (AEI) were calculated.A one-way ANOVA was used to analyze the data.Results There was a significant difference in the response AC/A between progressive myopes,stable myopes and emmetropes (F=4.051,P＜0.05).Progressive myopes had a higher AC/A ratio than stable myopes and emmetropes.No significant differences were found in the AEI values for the three refractive groups (F=2.579,P＞0.05).At high stimulus levels (3.21-4.12 D),progressive myopes showed more esophoria than stable myopes and emmetropes,but significant-differences were found between the three refractive groups only at the 4.12 D level (F=3.828,P＜0.05).Conclusion Progressive myopia has a higher response AC/A and more esophoria than stable myopes and emmetropes,which suggests that high AC/A and large esophoria may be the risk factors for myopia progression.And the large esophoria may be the reason for the high AC/A ratio. Key words: Myopia; AC/A ratio; Esophoria; The AEI value