摘要
目的 评价准分子激光原位角膜磨镶术 (laserinsitukeratomileusis ,LASIK)对近视患者静态近对比敏感度的影响。方法 使用功能性视力对比敏感度 10 1测试表 ,对 4 7例 (93只眼 )接受LASIK治疗的近视患者分别于术前、术后 1个月和 6个月检查空间频率为 1 5、3 0、6 0、12 0及 18 0周 /度 (cycle/degree ,c/d)的静态近对比敏感度 ,并进行统计学分析。结果 LASIK术后 1个月和 6个月裸眼视力接近术前矫正视力。术后 1个月术眼空间频率为 12 0和 18 0c/d的静态近对比敏感度低于术前 ,差异均有非常显著意义 (P <0 0 1) ,术后 6个月趋于恢复。术后 1个月术前屈光度数≥ - 6 0 0D者和术后出现眩光和光晕现象者空间频率为 6 0、12 0及 18 0c/d的对比敏感度下降率分别大于屈光度数 <- 6 0 0D者和术后无眩光和光晕现象者 (P <0 0 5 )。结论 对比敏感度检查可敏感、全面地反映患者的视功能状态 ,利于临床对视觉问题进行及时、有效的诊断 。
Objective To evaluate near contrast sensitivity function before and after myopic laser in situ keratomileusis (LASIK). Methods With FACT 101 test chart, static near contrast sensitivity was measured in randomly selected 47 subjects (93 eyes) before, 1 month and 6 months after LASIK. The contrast sensitivity was measured at 1 5, 3 0, 6 0, 12 0 and 18 0 cycles per degree (c/d) spatial frequency respectively and made comparison in them. Results The patients achieved the mean uncorrected visual acuity (UCVA) of 1 07±0 18 and 1 12 ±0 20 at postoperative 1 month and 6 months respectively. There was a general reduction in near contrast sensitivity in all spatial frequencies at postoperative 1 month when they were compared with the preoperative contrast sensitivity. The difference at 12 and 18 c/d spatial frequency was statistically significant ( t test, P <0 01). By the 6 month visit, all eyes showed a recovery of static contrast sensitivity function. The group of high myopia (preoperative ≥-6 00 D) and group with complaining of glare and halos after the surgery had a higher decrease rate of contrast sensitivity compared with that of the group preoperative <-6 00 D and the group of patients without such complaints respectively. The differences at 6 0, 12 0 and 18 0 c/d spatial frequency at 1 month visit was statistically significant ( t test, P <0 05). Conclusions The contrast sensitivity function test offers a more sensitive and comprehensive measure of functional vision than does standard Snellen acuity. The near contrast sensitivity in post LASIK patients at early stage is reduced despite normal visual acuity and this can affect the quality of vision.
出处
《中华眼科杂志》
CAS
CSCD
北大核心
2002年第11期677-679,共3页
Chinese Journal of Ophthalmology
