Secondary cataracts after the original cataract surgery are fairly common. They can be treated with YAG laser instead of actual surgery.
Some people who undergo phacoemulsification or extracapsular procedure for cataracts experience clouding of the lens that covers the capsule, which is called posterior capsular opacification or secondary cataract. Sometimes, this cloudiness affects vision, which can be corrected through a laser surgery called Nd: YAG (neodymium-doped yttrium aluminum garnet) posterior capsulotomy. The Nd: YAG laser is employed to create a hole in the black, clouded lining of the capsule so as to allow light through the membrane to the retina that is located at the back of the eye.