Eye problem?

Hi, one of my cats recently had a miscarriage, I've been posting about that in the pregnant cat section. It was last week, lately, we've been noticing that there is some kind of grey film over her eye, it looks grey.

What should I do about this?
\\The vet said he is not concerned.

Possibly get a second opinion...
It sounds rather suspicious. Was she checked for what complication(s) that could have caused her to lose the kittens?

How old is the kitty? Was she screened for diseases, like FIV? FIV can often cause eye problems, though it is certainly not the only possible cause.