Put him in wet pillow case and let him move around, make sure it's warm, or you may need to put like a heating pad or something to keep the snake warm, but leave him in for about 15 minutes or so, the motion with him trying to find a way out and rubbing his face against the pillow case should help, if that doesn't work try once more, but rewet it and make sure its warm again. Then they have other ways like prescription eye ointment from a vet or cotton swab with warm water gently rubbing over the eye, NO PRESSURE. If you don't see a little edge start to roll up like a contact lens after about 30-45 seconds stop. Those are just some ways. Pillow case works wonders though.