white milky eye

I am a college student.  I am rewriting "A Tell-Tale Heart" from the old old man's point of view.  In the story he has a white milky eye.  I want to give his eye some background.  I want him to be angry about it.  So I need an injury that would cause a white-milky eye that would last for a lifetime.  I know this is not an actual medical concern put this report is a large part of my grade and I need it to be accurate.  If anyone knows of anything I would greatly appreciate the help.

[Doreen Fazio, M.D.]

There are many conditions which could cause this appearance.  Prior eye surgeries such as cataract surgery with corneal edema (swelling), a failed or rejected corneal transplant, or a scarred cornea from a chemical injury such as an alkali burn are some.