The experimental group(right eyes)were treated with AOV-FB excimer laser and the controlled group(left eyes)were treated with Lasersight-2000 excimer laser machine.

• 实验组 :右眼 ；AOV - FB准分子激光眼科治疗仪组 ；预期矫正度数 -2 .；0 D。 对照组 :左眼；L asersight- 2 0 0 0准分子激光眼科治疗仪组；预期矫正度数 - 2