ABSTRACT
@#AIM:To study the effect of orthokeratology on accommodation function in myopic children.<p>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.<p>RESULTS: There was no statistical significance in the differences of the accommodative parameters between groups(all <i>P</i>>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 <i>P</i><0.05). Meanwhile, there was an significant interaction effect on the accommodative parameters between wearing time and wearing types of the two groups(<i>F</i>AA=5.3, <i>F</i>AS=4.6, <i>F</i>LAG=11.4, <i>F</i>NRA=3.4, <i>F</i>PRA=11.1, all <i>P<</i>0.05).<p>CONCLUSION: Wearing orthokeratology can improve the accommodation function of myopic children, which may be one of the mechanisms by which they control myopia.