Sounds to me like you've had a very successful shed. Sometimes bits of it (like the bottom of the jaw and/or pieces of the head) will break off and get lost.
IF the snake has a retained eyecap, it looks kind of like the snake is wearing an oversized contact lens that has jaggedy edges. And as Allison just said...IF that's the case, just leave it alone. The snake will either rub it off itself, or shed it off next time around. Better not to risk permanent eye injury by messing with it yourself when its not necessary.