Lupin,
No, I don't think the eye is protruding nor do I think the white film is within the lens. It really is just covering the eye. I'm not sure whether he can see very well.
This only became apparent when the algae bloom took over.
As you know, I am very conscientious about my tanks and fish.
My tank parameters are typically very clean.
I'll post again tomorrow. And, thank you very much for your interest.
G.