The aperture refers to the hole in the lens, known as the diaphragm, that lets the light in.
光圈就是镜头里面的一个小洞，就是一块横膈膜一样的东西，好让光线穿过。
2
It is the distance between the lensdiaphragm and the image plane.
即是镜头光圈与影像平面之间的距离。
3
Methods the surgical results and operative complications of 42 patients who underwent the implantation of black diaphragm intraocular lens were analyzed.