a opthalolist told my momthat she developed a film over her eye or eyes that she needed surgery to remove it and that eventually if not removed that it could become a tumor-what is this and did it come on suddenly or gradually AND WHAT KIND OF FILM and WHAT KIND OF SURGERY-my concern is the tumor part-what questions should i ask him-for i am gonna call him-she has gluama and has a horrible time seeing-also is there anything to improve her site with gluacoma