近视患者LASIK手术前后暗环境下对比敏感度分析

Mesopic contrast sensitivity before and after LASIK surgery for myopes

目的在LASIK手术前后对低中度、高度近视患者进行暗环境下对比敏感度测试，评估其夜间视觉质量变化。方法随机选取低中度、高度近视患者各38例，均行标准LASIK术。在术前与术后1月、3月以MesotestⅡb测试暗环境下对比敏感度。结果术前、术后1月及3月，高度近视组对比敏感度均低于低中度近视组（P〈0．05），术后差异性更明显。术后1月、3月时二组患者对比敏感度均下降，其中高度近视组下降更明显，有统计学意义（P〈0．05）。结论暗环境下，无论术前或术后，低中度近视组视觉质量均优于高度近视组。LASIK手术后，近视患者的暗环境对比敏感度较术前均下降，但随时间延长，患者对比敏感度有逐渐恢复的趋势。

Objective To evaluate the night visual quality changes between the low or moderate myopes and the high myopes under mesopic condition before and after LASIK surgery. Methods Randomly selected 38 low or moderate myopes and 38 high myopes. All the patients were treated under the regular LASIK standards. Mesotest Ⅱ b was used to examine the mesopic contrast sensitivity fimction at the point ofpre-operation, 1 month and 3 months post-operation. Preoperative and postoperative parameters in and between the two groups were compared. Results The mesopic contrast sensitivity function of the high myopes group were worse than that of the low or moderate myopes group both before and after surgery （P 〈 0.05 ）.The self-contrast in two group showed that while there was a significant difference in mesopic contrast sensitivity function between pre-and post-operation in the high myopes,no significant difference was found in the low or moderate myopes. Conclusions The night visual quality of the low or moderate myopes is better than that of the high myopes both before and after LASIK surgery.