准分子激光原位角膜磨镶术后早期眩光对暗视下对比敏感度的影响

Effect of early glare on contrast sensitivity after laser in situ keratomileusis under mesopic conditions

目的观察准分子激光原位角膜磨镶术(laser in situ keratomileusis,LASIK)后早期眩光对暗视下对比敏感度的影响。方法采用MesotestⅡb对比敏感度仪,检测72例行LASIK患者术后3个月的对比敏感度,并比较有和无眩光两种情况对暗视下对比敏感度的影响。结果无眩光时,未通过各测试等级的患者数较术前增加,但仅第4级(1∶2)差异有统计学意义;有眩光时,各测试等级未通过患者数较术前明显增加,第6级(1∶5)、第7级(1∶2.7)、第8级(1∶2)差异均有统计学意义。暗视下有眩光时,对比度降低2个等级以上的患者数明显多于无眩光时,差异有统计学意义。结论LASIK术后早期有眩光时暗视下对比敏感度明显降低。

Objective To investigate the effect of early glare on contrast sensitivity under mesopic conditions in patients who had undergone laser in situ keratomileusis （LASIK）. Methods Contrast sensitivity with and without glare was determined with the Mesotest Ⅱb under mesopic conditions in 72 patients who had undergone LASIK 3 months before. Results The proportion of patients who were not able to discriminate the mesopic contrast limits of grades without glare rose three months after LASIK than before the surgery, but not significantly different except grade 4（ contrast level 1： 2）. The proportion increased obviously with glare at grade 6 （contrast level 1：5 ）, grade 7 （contrast level 1：2.7 ） and grade 8 （contrast level 1： 2）. On the 3rd month, under mesopic conditions with glare, the proportion of patients whose contrast sensitivity decreased by 2 or more grades, significantly increased compared to that without glare. Conclusions Mesopic contrast sensitivity with glare became worse at the early stage after LASIK.