中低度近视眼PRK治疗后的对比敏感度变化及眩光现象

Contrast sensitivity and glare of the lower degree myopic patients after PRK

目的 研究准分子激光角膜切削术 (photorefrac-tive keratectom y,PRK)治疗中、低度近视眼所致的对比敏感度变化及眩光失能等参数 ,以评价 PRK后的视觉质量。方法对采用 PRK矫治的中、低度近视患者 (平均球镜度为 -3.16 D± 1.10 D,散光 <1D) 2 4例 4 6眼 ,用 CSV- 10 0 0检测设备测量其术前、术后 1月、6月时的对比敏感度和加眩光后的对比敏感度视力。结果 术后 1个月 ,对比敏感度均值在3c/ d(1.5 0 7± 1.2 38)和 18c/ d(0 .92 9± 0 .6 83)上有明显下降(P <0 .0 5 ) ,在 6 c/ d (1.84 3± 1.4 31)和 12 c/ d (1.5 0 7±1.0 0 8)上有下降趋势 ,加眩光后的对比敏感度在各频段均无显著变化趋势 (P>0 .0 5 )。术后 6个月时各频段对比敏感度基本回升到术前水平 ,加眩光后在中、低频段有下降趋势 ,但无统计学意义 ,高频区有上升趋势 ,也无统计学意义。结论 (1) PRK治疗中、低度近视患者在早期会导致对比敏感度下降 ;(2 )眩光检查表明 PRK后眩光现象属于不适性眩光 ,而并非失能性眩光 ;(3)可以认为 PRK矫正中。

Objective To investigate the contrast sensitivity and glare disability of the lower degree myopic patients after photorefractive keratectomy(PRK) using CSV 1000. Methods Twenty four patients (46 eyes) were selected (spherical equivalent-3.61D±1.10D). Measurements of contrast sensitivity preoperative and at 1, and 6 months after PRK with and without glare, respectively. Results Patients' contrast sensitivity obviously descended early at 3c/d and 18c/d after 1 month( P <0.05), and the glare test had no obvious descent. The contrast sensitivity restored to the normal range after 6 months. Conclusion Patients' contrast sensitivity obviously descends early after PRK. The glare test suggests that the glare effect belongs to discomfort glare . The disturbance of the visual quality after PRK can be restored to normal.