MAIN OUTCOME MEASURES: Morphology of pterygium and expressions of CD34, vimentin (VIM), smooth muscle actin (SMA), S-100 in pterygium.

• 主要观察指标：翼状胬肉形态学变化及CD34、波形纤维蛋白、平滑肌肌动蛋白、S-100在翼状胬肉中的表达。