Matt,

The spectacles are not likely to come off by themselves and could lead to blindness if they're not removed. The key point is that you have to thoroughly moisten the retained skin and spectacles before trying to remove anything. I've had good luck holding their head under slowly flowing water for a few seconds, then giving them a minute or two to regroup; then wetting them again. Then I'll remove the retained skin.

I hate to mix two methods, so try James' method with the wet bag and tape first. If it doesn't come off, and if there is enough of the retained skin sticking far enough from the eye that you could easily and comfortably grab it, then do so after wetting the snake, and try to slowly peel it off. Put the snake's body in a pillow case or bag before doing so, though, because it will probably musk on you, and will try to thrash around. The bag will restrain the snake and keep it from hurting itself while you're holding it behind the head. Post a picture if you can.