Posterior capsule opacification, or PCO, is common after cataract surgery, especially after a few years have passed. Even a perfect surgery by a master surgeon still leads to PCO in many cases.
PDF document available at: https://www.un.org/development/desa/dpad/wp-content/uploads/sites/45/publication/PB_109_Jun30.pdf In his report to the 59th Commission for ...