Abstract
Objectives:To investigate the short-and long-term effects of myopia control spectacle lenses with highly aspherical lenslets(HAL)and slightly aspherical lenslets(SAL)on visual function and visual quality using data obtained from a randomized controlled clinical trial.Methods:This was a prospective,randomized,controlled,and double-blinded study;170 myopic children aged 8-13 years were randomly assigned to the HAL,SAL,or single-vision spectacle lenses(SVL)groups.Distance and near visual acuity(VA)at high(100％)and low(10％)contrast in photopic and scotopic conditions,near phoria,stereoacu-ity,and accommodative lag,microfluctuations(AMFs),amplitude(AA)were measured after wearing lenses for 10 min,6 months,and 12 months.Results:In total,161 subjects completed all follow-ups in 12 months and were included in the analysis.After 10 min of wearing,the HAL and SAL groups had lower scotopic and low-contrast VA than the SVL group(decreased 0.03-0.08 logMAR and 0.01-0.04 logMAR in different VAs in the HAL and SAL groups,respectively,all P＜0.05).The reduction in VA was recovered at 12 months as the HAL and SAL groups exhibited significant VA improvements,and the VA was not different among the three groups(all P＞0.05).The HAL and SAL groups had significantly larger AMFs than the SVL group(HAL vs.SAL vs.SVL:0.21±0.08 D vs.0.16±0.05 D vs.0.15±0.06 D at baseline,0.19±0.07 D vs.0.17±0.05 D vs.0.13±0.07 D at 12 months,all P＜0.05).There were no significant differences in accommodative lag,AA,or phoria between the groups(all P＞0.05).The HAL and SAL groups had reduced stereoacuity compared to the SVL group at baseline(70"vs.60"vs.50",P=0.005),but no difference was observed at 12 months(70"vs.70"vs.70",P=0.11).Conclusions:HAL and SAL have no significant influence on accommodation and phoria except having larger AMF than SVL.Scotopic VA and low-contrast VA are reduced with short-term HAL and SAL use but recovered to be at same level with the SVL after 1 year of use.
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