Q值调整准分子激光近视手术后角膜前后表面Q值变化

Changes in Q factor value of corneal anterior and posterior surface after Q-factor guided LASIK

目的 Q值调整准分子激光原位角膜磨镶术(LASIK)对角膜前后表面Q值的影响和分析。方法选择2009年5月-2011年1月在我院激光近视中心行老视矫正LASIK手术患者23例46眼。根据主视眼不同分为观察组(Q值调整切削)和对照组(普通切削),对非主视眼行Q值调整LASIK手术,目标Q值设为-0.6—-1.0。分别于手术前和手术后3个月行Pentecam检查,对角膜前后表面Q值进行测量并进行分析。结果手术前两组角膜前、后表面各范围Q值差异无统计学意义(P>0.05)。手术后观察组角膜前表面Q20、Q25、Q30分别为0.14,0.14和0.06,对照组分别为0.27,0.28和0.20,两组差异有统计学意义(P<0.01);而Q35、Q40两组角膜后表面Q值差异无统计学意义(P>0.05)。结论 Q值调整LASIK术后角膜Q值的增加值明显少于普通LASIK手术,使患者角膜非球面性得到重塑,有效改善老视人群获得更为理想的远近视力效果。

Objective To analyze the effect of Q-factor guided LASIK on Q factor value of the corneal anterior and posterior surface.Methods Twenty-three patients（46 eyes）,admitted to our hospital for LASIK from May 2009 to January 2011,were divided into observation group and control group according to their dominant visual acuity eyes.Their non-dominant visual acuity eye underwent LASIK with the target Q-factor value set at 0.6-1.0.The Q factor of the corneal anterior and posterior surface in all eyes,examined with Pentecam method,was analyzed.Results No significant difference was found in Q factor value of the anterior and posterior corneal surface between the two groups before operation.The Q20,Q25,and Q30 value of the anterior corneal surface was 0.14,0.14 and 0.06 respectively in observation group and 0.27,0.28 and 0.20 respectively in control group after operation（P〈0.01）.However,no significant difference was found in Q35 and Q40 factor value of the anterior corneal surface between the two group after operation（P〉0.05）.Conclusion The Q factor value is lower after Q-factor-guided LASIK than after common LASIK.Q-factor guided LASIK can reconstruct the corneal aspheric surface and improve the visual acuity of presbyopic subjects