I have pondered much about this.

I have often wondered about cases of multiple personalities where one personality needs corrective lenses and another sees 20/20..

I have wondered why viewing through a pin hole makes things clear..

I have wondered if the brain limits vision as a protective mechanism.. and if healing the heart and the mind would produce clearer vision

Also I have wondered why in dreams your vision is clear when in reality you could be dependent on glasses or contacts.

Personally, I started needing glasses at the age of nine and I have wondered if it had anything to do with the stress in the home growing up.. as if less things were seen would reduce stress to a level one could cope with.