ISOPTO CARPINE can be prescribed by healthcare professionals that treat conditions of the eye. They are useful for a variety of conditions, including: Induction of miosis (pupil constriction), Manage acute angle-closure glaucoma, Reduce eye pressure in people with ocular hypertension or open-angle glaucoma, Prevent increased eye pressure after laser surgery ISOPTO CARPINE works by lowering the pressure inside of the eye. It attaches to muscarinic receptors, which causes contraction of the iris sphincter and ciliary muscle. The effects of ISOPTO CARPINE drops cause miosis and lower intraocular pressure (IOP).