Q值引导个体化LASIK与标准化LASIK术对患者暗环境下低对比度视力的影响

目的比较Q值引导个性化LASIK（Q-LASIK）与标准化LASIK（S-LASIK）对患者暗环境下低对比度视力（LCVA）的影响。方法行LASIK术患者69例133只眼,其中行S-LASIK患者37例71只眼（S组）,按等效球镜度分为低度近视组（S1组）、中度近视组（S2组）及高度近视组（S3组）;行Q-LASIK患者32例62只眼（Q组）,同样按等效球镜度分为Q1、Q2及Q3组。对S组及Q组患者手术前后的LCVA值及主观感受进行比较分析。结果 （1）S组中,术后1周各近视度组LCVA值均较术前显著增大（P〈0.05）;术后1个月,S1组LCVA值恢复至术前水平（P〉0.05）;术后3个月S2组LCVA值恢复至术前水平（P〈0.05）。（2）Q组中,各近视度组在术后各时间段LCVA值与术前差异均无显著意义。（3）术后3个月,S3组患者ΔQ值、Δ球差值和ΔLCVA值显著大于Q3组（P〈0.05）。（4）术后各时间段两组夜间视力较术前戴镜时差的主诉发生率差异无显著意义（P〉0.05）。结论 Q-LASIK术能够相对减轻高度近视患者术后的夜视力下降。

Effect of Different Corneal Refractive Surgery on Low Contrast Visual Acuity

Objective To compare the effect of Q-value guided customized LASIK(Q-LASIK) and standardized LASIK(S-LASIK) on the low contrast visual acuity(LCVA). Methods Seventy-one eyes of 37 patients were treated with S-LASIK and 62 eyes of 32 patients were treated with Q-LASIK.Preoperation and 1 week,1 month and 3 months postoperation,visual acuity,refractions,Q-value,spherical aberration(SA) and LCVA were evaluated in all cases. Results (1) In the S-LASIK group,the LCVA of the low,moderate and high myopia groups increased significantly at 1 week after surgery;as for the low myopia group,the LCVA recovered to the preoperative level at 1 month after surgery and the LCVA of the moderate myopia group recovered to the preoperative level at 3 months after surgery.(2) In the Q-LASIK group,the LCVA after surgery appeared no differences at different time points compared to that evaluated before surgery.(3) In Q3 group,the ΔLCVA,ΔQ and ΔSA were significantly lower than that in S-LASIK group at 3 months after surgery(P<0.05).(4) The incidence of vision quality’s decrement in Q-LASIK group at different time points after surgery was lower than that in S-LASIK group(P>0.05). Conclusions For the high myopia group,Q-LASIK has less effects on scotopic low contrast visual acuity.