The site alleges that there are a number of positive self-treating anecdotes found on the internet. Is there a medically justified explanation for these? (It's

The site alleges that there are a number of positive self-treating anecdotes found on the internet. Is there a medically justified explanation for these? (It's ok if not -- an alternative is that they're cranks or lying, both of which are very plausible). What is the minimum vision improvement from behavioural adjustment that would be medically surprising to you?