Rey Mysterio lost an eye at the Horror Show at Extreme Rules. This was a gruesome stipulation, but there was a reason that they went this direction.
They provided an update on Mysterio during the show saying that he might regain his eyesight. This left a door open for him to regain his vision and make a return later on.
It was also noted that if Rey Mysterio decides to go to another pro wrestling company it’s very likely that he his vision will be 100% restored. This is a very interesting situation.