AIM: To compare the objective optical quality of high myopic patients between SMILE and V4c ICL implantation.

METHODS: This was a prospective control study. Thirty-eight patients underwent SMILE and thirty-two patients underwent V4c ICL implantation with high myopia were chosen for this study. Uncorrected visual acuity(UCVA), best corrected visual acuity(BCVA)and refractive situation were evaluated preoperatively, at 1wk, 1mo, 3mo and 6mo postoperatively. The objective scattering index(OSI), strehl rate(SR)and modulation transfer function(MTF)cut off frequency were measured by the double-pass optical quality system at the same time.

RESULTS: No significant difference of spherical equivalent(SE), UCVA and BCVA was found between SMILE group and V4c ICL implantation group at all time points. At 1wk and 1mo after operation, the OSI values of two groups were significantly higher than pre-operation(P<0.01). OSI values of two groups returned to baseline at 3mo after operation. The MTF cut off frequency of both groups decreased significantly at 1wk after operation(P<0.05)and recovered to baseline at 1mo after operation, no significant difference was found between two group at all time points(P>0.05).

CONCLUSION: Both SMILE and V4c ICL implantation can obtain good visual acuity and objective optical quality.