Effect of orthokeratology lenses and frame lens on eye regulation parameters in myopic children

Abstract

AIM:To study the effect of orthokeratology on accommodation function in myopic children.METHODS: This was a retrospective clinical study. The clinical data of myopia children in our hospital from September 2015 to December 2018, who wore orthokeratology contact lens(Ortho-k)or single vision lens(SVL)to control myopia were analyzed. 27 cases(54 eyes)with Ortho-k were all selected as the study group, the control group was matched from 108 cases(216 eyes)of the SVL group with the Propensity Score-matching(PSM)function of SPSS software. After matching, 27 cases treated with Ortho-k were compared to 27 cases treated with SVL. Accommodation function were assessed by accommodative amplitude(AA), accommodative sensitivity(AS), accommodative lag(LAG), negative relative accommodation(NRA), and positive relative accommodation(PRA)before and 1, 3, 6 and 12mo after treatment.RESULTS: There was no statistical significance in the differences of the accommodative parameters between groups(all P>0.05); Wearing time had a significant effect on AA, AS, LAG, NRA and PRA of myopic children in two groups(FAA=4.7, FAS=5.6, FLAG=10.2,FNRA=7.06, FPRA=8.8, all PFAA=5.3, FAS=4.6, FLAG=11.4, FNRA=3.4, FPRA=11.1, all P0.05).CONCLUSION: Wearing orthokeratology can improve the accommodation function of myopic children, which may be one of the mechanisms by which they control myopia.

Keywords

• orthokeratology
• myopia
• accommodation
• frame lens
• single vision lens