In short, inject pure formalin into the anterior chamber, and let it sit for 1 or 2 minutes. Thats it. :) There is supposedly some formalin on one of the shelves in the lab.
Here is the reference for more details, they suggest diluting the formalin, but it supposedly works better to use pure formalin:
Hashimoto C, Kurosaka D, Uetsuki Y. Teaching continuous curvilinear capsulorhexis using a postmortem pig eye with simulated cataract. J Cat Refractive Surg 2001; 27: 814-6.
Note that we can access this link online by going through the UIC Health Sciences Library and going through the Electronic Journals link.