激光治疗近视眼中角膜曲率修正量的理论计算

本文从示意眼模型出发,利用自治的单透镜近似模型,根据矩阵光学原理,用计算机算出不同近视眼度数焦点的前移量以及在三种不同原因引起的近视眼的情况下角膜需要切除的数量。计算告诉我们即使1000°近视眼,角膜最大切除量也仅50μ,不到角膜总厚度的1/10。 理论上探讨了根据激光束的高斯分布经过光学系统改变光强分布来实现近视眼需要校正的曲率。

THEORETICAL CALCULATION OF THE QUANTITY OF CORNEA ABLATION IN LASER MYOPIA THERAPY

Basing on the statistical model of eyes, using self-consistency single lens approximation and matrix optical theorem, we have calculated the backward shift of focus under the condition of different myopia degrees, and the quantity of corneal ablation for three different causes of myopia. The calculation shows that the maximum ablation is only 50um less than one tenth of the total corneal thickness although the myopia is 1000 degrees.We also consider using optical system to alternate illuminative distribution to achieve adjusting myopia, based on the gaussian distribution of laser beam.