It's been that way as long as I can remember - and he's seen the vet at least 3 or 4 times since the winter holidays, so I'm sure she must have noticed it, since she checks his eyes every visit. But now I wonder if maybe she hasn't noticed.
I looked up cloudy eyes and glaucoma, and I don't know if he fits the symptoms. His eye appears normal, but the white of his eye surrounding the pupil and iris is a brownish colour, like his eye is bruised, right to the edges of his eye where it becomes white again. It doesn't show up in pictures because you have to look really close to see the discolouration.
I don't know - I am going to call the vet, but does this sound like anything you might have heard of before? He gets a lot of pimples around his eye too - he currently has a big one right on his eyelid tip, which was what made me start thinking more about his eye in the first place.