Objective To observe the clinical effect of a double hyperboloid mirror system for extending the viewing dis-tance on the axial growth of pre-myopic eyes in Chinese youth,in order to evaluate its application value in preventing and controlling myopia in children,and provide evidence for more effective eye behavior intervention in children's health.Methods A total of 120 cases(240 eyes)aged 6-10 years old in a primary school in Ningbo,participated in the study from April 2021 to March 2022.Sixty cases(120 eyes)in the observation group used the double hyperboloid mirror sys-tem for near vision work,while another 60 cases(120 eyes)did not use the double hyperboloid mirror system for near vi-sion work in the control group.Follow-up observation were conducted for 1 year,and uncorrected visual acuity(UCVA),best corrected visual acuity(BCVA),spherical equivalent(SE),axial length(AL)and distance and near horizontal eye position were recorded at baseline,6 months,and 12 months.The changes in SE and AL of students in the two groups at baseline,6 months,and 12 months were analyzed.Pearson correlation test and linear regression were used to analyze the relationship between the usage duration of the double hyperboloid mirror system and axial length growth.Re-sults There were significant differences between the two groups in the changes of SE and AL.After 12 months,the change of SE in the observation group was significantly lower than that in the control group(P＜0.001).Additionally,both eyes in the observation group showed a significantly lower change in AL compared to the control group(P＜0.001).Compared with the control group,the change of AL in the observation group was 0.18 mm lower in the left eye and 0.21 mm lower in the right eye,and the progression of AL was reduced by 43.9％in the left eye and 48.8％in the right eye.There was no significant difference of distance and near horizontal eye position and BCVA in the observation group before and after 12 months(P＞0.01).The Pearson correlation test and linear regression analysis revealed a significant negative correlation between the usage duration of the double hyperboloid mirror system and axial length growth(P＜0.001).Conclusion The use of the double hyperboloid mirror system can effectively control axial length growth in pre-myopic primary school children,and the longer they used the double hyperboloid mirror system,the lower of the axial length growth.This type of visual aid instrument provides a certain effective basis for behavior intervention related to the preven-tion and control of myopia in children.
Double hyperboloid mirror systemPre-myopiaMyopia prevention and controlEye axis length
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