Betadine ONLY for something that close to an eye. Other disinfectants can cause serious damage to the cornea.

I'm a vet tech and I work almost exclusively with ophthalmology (eyes). If you are able to post pics, I might be able to answer some of your questions. I don't like really that you said the eye looks 'bluish..." he may need meds for inflammation, an ulcer, etc, but then again he may be fine.

A herp vet or a veterinary ophthalmologist that would see a snake is your best bet if you want to be absolutely sure, but if that's not possible, post up some pics.

Good luck!