介绍了渐变镜片的基本结构及工作原理，给出其基于狄利克雷条件的软设计方法。
The basic feature and principle of progressive addition lens (PAL) are introduced. Its soft design method based on Dirichlet principle was given.
给出了在狄利克雷边界条件下，由两个相交球面围成的区域中泊松方程的格林函数。
The Green's function for the Poisson equation in the domains bounded by two intersecting spheres with Dirichlet boundary conditions is presented.
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