Pneumatic retinopexy - this procedure is more common if the detachment is uncomplicated. The surgeon may start by freezing (cryopexy) the tear area. A bubble is injected into the vitreous cavity of the eye, causing the retina to push against the tear and the detached area. The continuous pressure, which may go on for days, eventually makes the retina re-attach itself to the wall of the back of the eye.