Unlikely, but you still have an N=1. This is a case study, not proof of efficacy. It was an unknown ocular pressure that caused the blindness and could very w

Unlikely, but you still have an N=1. This is a case study, not proof of efficacy. It was an unknown ocular pressure that caused the blindness and could very well be an unknown and unrelated reaction that caused the recovery. Just because one event happens after another event does not mean one event caused the other. Very interesting, and worth attention and further study, but not proof.