Hi! Though I cant answer this question well but I am interested to know. I think Sahil has uploaded a good paper. I was wondering if you are planning to preserve rabbit corneas, do you plan to transplant them of use them for any other purpose.
If you want to keep the biochemistry and physiology as viable as possible for, may be, a transplant, then rabbit serum (preferably autologous) with certain antibiotics and added nutrients should work. There are, however, commercial media also available.