Sorry - not up to scratch on eye doc's ...I raised the point because I dug around in a medical library at a hospital and found (purely by chance) a journal written by an aviation medical specialist who was also an oncologist. His journal helped me regain my medical. I used his findings to illustrate precedent.
It sounds as though firedragon has got a useful line of investigation to follow. I'm sorry I can't be more helpful, but wish you well.