Oh Joo Youn, Wee Won Ryang
Department of Ophthalmology, Seoul National University Hospital, Seoul, Korea.
Clin Ophthalmol. 2010 Apr 26;4:315-9. doi: 10.2147/opth.s9870.
To investigate the effect of pterygium surgery on corneal topography and contrast sensitivity.
The IRB approved this prospective, nonrandomized, self-controlled study. Computerized videokeratography (Orbscan II) was performed in 36 patients with primary pterygia, both before and 1 month after pterygium excision with limbal-conjunctival autografting. The topographic parameters were compared. Spatial contrast sensitivity testing was performed using VCTS 6500. Differences between preoperative and postoperative values were evaluated statistically.
The mean Sim K astigmatism and irregularity index, significantly decreased after pterygium surgery. The mean refractive power significantly increased after the operation. The "with-the-rule" astigmatism induced by pterygium became "against-the-rule" astigmatism after pterygium removal (P = 0.041). The contrast sensitivity of 6, 12, and 18 cycles per degree, significantly increased from 1.55 +/- 0.28, 0.97 +/- 0.47, and 0.29 +/- 0.16 to 1.72 +/- 0.18, 1.21 +/- 0.44, and 0.65 +/- 0.48, respectively (P = 0.007, <0.001, <0.001, respectively).
Pterygium surgery significantly reduces corneal topographic astigmatism and improves contrast sensitivity.
探讨翼状胬肉手术对角膜地形图及对比敏感度的影响。
本前瞻性、非随机、自身对照研究获机构审查委员会批准。对36例原发性翼状胬肉患者在翼状胬肉切除联合自体角膜缘结膜移植术前及术后1个月进行计算机化视频角膜地形图检查（Orbscan II）。比较地形图参数。使用VCTS 6500进行空间对比敏感度测试。对术前和术后值的差异进行统计学评估。
翼状胬肉手术后平均Sim K散光和不规则指数显著降低。术后平均屈光力显著增加。翼状胬肉引起的“顺规”散光在翼状胬肉切除后变为“逆规”散光（P = 0.041）。每度6、12和18周期间的对比敏感度分别从1.55±0.28、0.97±0.47和0.29±0.16显著提高到1.72±0.18、1.21±0.44和0.65±0.48（P分别为0.007、<0.001、<0.001）。
翼状胬肉手术可显著降低角膜地形图散光并提高对比敏感度。
