Historian David Landes thinks the clock was the greatest medieval invention, but I suspect eyeglasses were
@whyvert percentage of people needing eyeglasses likely drastically lower even 100 years ago
-
-
@whyvert (not just lifespan but the sun exposure thing) -
@sarahdoingthing Agreed for myopia. But everyone gets presbyopia at age 40 or so, AFAIK - 2 more replies
New conversation -
Loading seems to be taking a while.
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.