Eye condition

My 11 month old stray has a slight film on the on a small portion of the exterior of her right eyeball...do you know what it may be? I don't think it is a cataract, since they are rare in cats. She is an outdoor cat for the most part. Any thoughts you might have would be greatly appreciated.

Brian

I may be wrong but it sounds like a third eyelid problem and should be addressed by a vet