Contacts seem way more dangerous. Eyes are immune privileged, a dirty contact lens can lead to a rapidly growing infection with permanent loss of visual acuity

Contacts seem way more dangerous. Eyes are immune privileged, a dirty contact lens can lead to a rapidly growing infection with permanent loss of visual acuity in a matter of days. That is the short term; in the long term, the reduced oxygen supply to your eyes may lead to excessive ingrowth of blood vessels into the cornea. They are permanent and can obscure vision once you accrue enough of them.