The cataract can sometimes cause phacomorphic glaucoma. Very advanced cataracts with weak zonules are liable to dislocation anteriorly or posteriorly. Cataracts develop from a variety of reasons, including advanced age, long-term exposure to ultraviolet light, exposure to radiation, secondary effects of diseases such as diabetes, hypertension, etc.
Cataract operations are usually performed using a local anaesthetic and the patient is allowed to go home the same day. Recent improvements in intraocular technology now allow cataract patients to choose a multifocal lens to create a visual environment in which they are less dependent on glasses. Under some medical systems multifocal lenses cost extra. Traditional intraocular lenses are monofocal.