AIM:To explore the changes of visual quality in myopic eyes undergoing overnight orthokeratology.

METHODS:Fifty-five myopia adolescents(110 eyes)were recruited. Optical scattering index(OSI),MTF cut off, Strehl ratio, OQAS value(OV100%、OV20%、OV9%), index of highest asymmetry(IHA),index of highest decentration(IHD),aberration coefficient(ABR)were performed before and 1wk,1,3 and 6mo after wearing orthokeratology with OQASTMⅡ and corneal topography.

RESULTS:The uncorrected visual acuity(UCVA)before wearing orthokeratology lens was 0.21±0.13,but at 1wk,1,3 and 6mo after wearing were 0.48±0.15,0.72±0.14,0.93±0.13 and 1.02±0.13,respectively,and there were statistical differences before and after wearing(P<0.05).On OSI after wearing at 1,3 and 6mo compared with that before wearing, there were significant differences(P<0.05).On MTF cut off after wearing at 1,3 and 6mo compared with that before wearing, there were significant differences(P<0.05).On Strehl ratio after wearing at 1,3 and 6 mo compared with that before wearing, there were significant differences(P<0.05).On OV9% after wearing at 1,3,6 mo compared with that before wearing, there were significant differences(P<0.05).IHA were 4.13±3.59, 19.11±15.38, 17.78±17.12, 34.18±23.34 before and 1, 3 and 6 mo after wearing. Compared with that before wearing, IHA significantly increased(P<0.05). IHD were 0, 0.02±0.01, 0.02±0.02, 0.03±0.02, 0.03±0.01 before and 1wk,1, 3 and 6mo after wearing. Compared with that before wearing, IHD were significantly increased(P<0.05). ABR were 0.29±0.51, 1.23±0.71, 2.10±0.59 before and 1wk and 6mo after wearing. Compared with that before wearing, ABR were significantly decreased(P<0.05).

CONCLUSION:Orthokeratology deteriorates vision quality. But the loss is acceptable. Orthokeratology can improve UCVA quickly and effectively. It is worth of affirmation on control of myopia.