<P>在zemax的手册中关于edge thickness的定义一直没有搞懂，在这请教各位。</P>
<P>我把这段话写在这里：</P>
<P>zemax uses two different definitions for the term "edge thickness". Usually, the edge thickness is computed foa seecific surface by:</P>
<P>E(i)=Z(i+1)-Z(i)+T(i) （这里括号里的字符表示下标）</P>
<P>where Z(i) is the sag of the surface at the +y semi-diameter（是指半径为+y处吗？）of the surface, Z(i+1) is the sag of the next surface at the +y semi-diameter of the next surface, and T(i) is the axial thickness of the surface(这个thickness of the surface又是怎么定义的呀？). Note that the edge thickness are computed accounting for the sag at he respective semi-diameter of each surface, which in general are different.</P>
<P>主要是edge thickness要加上那个T(i)，实在是搞不懂。</P>
<P>还有一个没搞懂的是edge thickness solve，感觉看上去也是一头雾水啊。</P>