Methods Corneal topographys of 119 eyes were measured after LASIK in different period,compare the visual acuity of normal and central islands eyes,and the change of centra islands in different period.

• 方法61例119只眼在LASIK术后不同时期进行角膜地形图检查,比较正常角膜地形图及中央岛型角膜地形图眼的视力及其变化,判断术后中央岛对视力的影响。