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以Kooijman眼模型为基础,根据Jimenez的理论及临床上应用的Munnerlyn理论,分析了激光在角膜前表面的斜入射和反射对角膜屈光手术后人眼成像质量的影响。研究表明,激光的斜入射和反射会引起一定的术后欠矫,但是影响不大,对于-9D的术前屈光不正,由激光能量损失引起的欠矫也只有-0.6D;激光角膜手术本身会使术后角膜前表面的非球面系数变大。随着术前屈光不正的增大,非球面系数由术前的负值变为正值,使得术后的人眼球差增大。考虑了激光斜入射和反射后的术后非球面系数与Munnerlyn公式的预期值差别不大,术后非球面系数的大小与光区的关系不大。
Based on Kooijman’s eye model and the theory of Jimenez and Munnerlyn’s theory of clinical application, the effects of laser oblique incidence and reflection on the corneal anterior surface after corneal refractive surgery were analyzed. Studies have shown that the oblique incidence and reflection of laser will cause a certain degree of undercorrection, but it has little effect. For the preoperative refractive error of -9D, the undercorrection caused by laser energy loss is only -0.6D. Laser corneal surgery Itself will make the anterior corneal aspheric surface coefficient becomes larger. With the preoperative refractive error increases, the aspherical coefficient changes from a negative preoperative value to positive, making the postoperative eye spherical aberration increases. Considering the laser oblique incidence and reflection of postoperative aspheric coefficient and Munnerlyn formula of the expected value is not very different, the size of the postoperative aspheric coefficient and the light area is not.