软性与透气性硬性角膜接触镜配戴者角膜地形图及前房深度对比分析

目的　比较配戴软性及硬性角膜接触镜对角膜形态及前房深度的影响。方法　选取屈光不正患者６０例（１２０眼），分别予以配戴软性角膜接触镜（ｓｏｆｔｃｏｎｔａｃｔｌｅｎｓ，ＳＣＬ）及透气性硬性角膜接触镜（ｒｉｇｉｄｇａｓｐｅｒｍｅａｂｌｅｃｏｎｔａｃｔｌｅｎｓ，ＲＧＰＣＬ），其中ＳＣＬ组３０例（６０眼），ＲＧＰＣＬ组３０例（６０眼），ＯｂｓｃａｎⅡ角膜地形图观察戴镜前及戴镜后１ａ、２ａ角膜屈光力、角膜前后表面Ｄｉｆｆ值、中央角膜厚度、前房深度的变化。结果　戴镜前ＲＧＰＣＬ组角膜上下表面屈光力差值为（０．９８±０．４９）Ｄ，戴镜后１ａ为（０．６６±０．４３）Ｄ，戴镜后２ａ为（０．５９±０．３７）Ｄ，均较戴镜前减小（Ｐ＜０．０５）；戴镜后１ａ、２ａ角膜前表面屈光力均较戴镜前降低，差异均有统计学意义（均为Ｐ＜０．０５）。ＳＣＬ组戴镜后１ａ、２ａ角膜前后表面屈光力、Ｉ－Ｓ值、前后表面Ｄｉｆｆ值、前房深度与戴镜前比较，差异均无统计学意义（均为Ｐ＞０．０５）；戴镜前中央角膜厚度为（５４９±２６）μｍ，戴镜后１ａ为（５２７±２９）μｍ，与戴镜前比较差异无统计学意义（Ｐ＞０．０５），戴镜后２ａ为（５０９±３１）μｍ，与戴镜前比较差异有统计学意义（Ｐ＜０．０５）。结论　长期配戴ＲＧＰＣＬ对角膜代谢和功能影响不明显，且能够提供更好的光学矫正效果。

Comparison of corneal topography and anterior chamber depth between patients wearing RGPCL and SCL

Objective To evaluate and compare the effects of soft contact lens ( SCL) and rigid gas permeable contact lens ( RGPCL) on corneal topography and anterior chamber depth. Methods One hundred and twenty eyes of 60 contact lens users were divided into two groups :SCL group and RGPCL group,30 cases ( 60 eyes) in each group. The corneal refraction , anterior and posterior corneal surface Diff values . central corneal thickness , anterior chamber depth before wearing CL and I year,2 years after wearing CL were measured and compared. Results The corneal I - S value before wearing RGPCL was ( 0. 98 + 0. 49 ) D ,1 year after wearing RGPCL was ( 0. 66 +0. 43 ) D . and 2 years after wearing RGPCL was ( 0. 59 + 0. 37 ) D. there was statistical difference compared with that before wearing RGPCL ( P < 0. 05 ) . At 2 years after wearing RGPCL , the average refractive power of anterior corneal surface was lower than that before wearing RGPCL ( P < 0. 05 ) . There was no statistical difference in refractive power of anterior and posterior corneal surface. I-S value. anterior and posterior corneal surface Diff values and anterior chamber depth at 2 years after wearing SCL compared with before wearing SCL ( all P > 0. 05 ) ; Central corneal thickness before wearing SCL was (549 +26) ym, at I year after wearing SCL was (527 + 29) ym , there was no statistical difference (P > 0. 05 ) .and at 2 years after wearing SCL was (509 + 31) ym, there was statistical difference (P < 0. 05 ) . Conclusion RGPCL does not change the corneal metabolism and function.and can provide the better corrected refractive effects.