近视眼LASIK术后早期对比敏感度变化和眩光测试

目的]研究LASIK术后早期,暗视/明视下对比敏感度(CSF)的变化及眩光刺激对CSF的影响,评估患者术后早期的视觉质量.方法]27例53只近视眼被纳入本研究,分别于术前、术后1周、1月和3月测量暗视/明视下的CSF和两种模拟背景并眩光刺激下的CSF,所有CSF均为矫正视力下测得.结果]LASIK术后,各空间频率的CSF较之于术前均有明显下降(P≤0.001),术后3月大部分频率的CSF已接近或达到术前水平.术前,眩光刺激对各频率的CSF均无影响(P>0.05).术后,眩光刺激降低了暗视下中、高频率和明视下中间频率段的CSF(P<0.05),以术后1周降低最显著.结论]①LASIK术后,各频率CSF普遍下降;②眩光刺激对CSF的影响主要集中在暗视下中、高频率;③随着术后时间的延长,CSF逐渐恢复,眩光对CSF的影响逐渐减小.

Early Changes in Contrast Sensitivity and Glare Test after Myoptic Laser in Stiu Keratomilileusis

To investigate the early change of co ntrast sensitivity function(CSF)and the effects of glare on CSF after lase r in situ keratomilileusis(LASIK)under mesopic and photopic conditions,and to evaluate the early postoperative functional visual performance.A total of54eyes of 27patients were included i n the prospective analysis.Photopi c and mesopic functional acuity contrast testing were performed pre operatively and 1week,1month,3months postoperatively under best corrected conditions.Photopic and mesopic CSF obviously d ecreased for all spatial frequencies 1week postoperatively and restored to pre -operative level for some spatial frequencies 3months postoperatively.Glare caused a significant decrease in mesopic CSF for intermediate and high spatial frequencies postoperative ly.Glare disability 1and 3months postoperatively was less than that of1week postoperatively.Conclusions]Though early postoperative best corrected visual acuity is normal,there is a significant decrease in CSF for all spatial frequencies and obvious mesopic glare disability for intermediate and hig h spatial frequencies.The longer after LASIK,the less decrease in CSF and glare disability.