Miochol-E is used to obtain miosis of the iris after a patient undergoes a cataract surgery. A person who is having clouding of the eye's lens may require a surgery for the cataracts to be removed to have a clear vision. When this cloudy lens is removed or cleaned and replaced by an artificial lens. This process is called intraocular lens implantation and is permanent with no special care. Miochol-E is also used to penetrate anterior segments of the eye where rapid miosis may be required.