Topix Underground

My vision was perfect until I was 40. Then it was like a switch got flipped, and I’m blind as a bat.

Same thing happened to me. It distorts your relationship with the environment.  What did the Neanderthals do I wonder? 
I read that they think they can treat dementia by way of improving vision in old people so they are not detached from their surroundings.  They think that will have an outsized effect.