#DidYouKnow that the first every vision aid was invented around 1000 AD. It was called the reading stone - a small glass sphere was placed on top of small letters and texts to magnify them for easy reading. Luckily these days we just use reading glasses. https://t.co/wktSIIHzAs

#DidYouKnow that the first every vision aid was invented around 1000 AD. It was called the reading stone - a small glass sphere was placed on top of small letters and texts to magnify them for easy reading. Luckily these days we just use reading glasses.https://t.co/wktSIIHzAs

— Simon Donne Optician (@SimonDOpticians) November 16, 2018

from Twitter https://twitter.com/SimonDOpticians