Cataract surgery is necessary when clouding of the lens of the eye causes impairment or loss of vision. The surgery involves the removal of the natural lens of the eye, and replacement with a synthetic lens, effectively restoring lens transparency.
Early symptoms of a cataract include strong glare from lights at night, as well as reduced vision acuity at low light levels. Over time, vision can become impaired, and in advanced cases loss of vision can occur.
Cataract surgery is an outpatient procedure during which general anaesthesia is used. There is typically little or no discomfort to the patient, and over 90% of cataract surgeries succeed in restoring useful vision.