Eyeglasses are an essential tool for thousands of people across the globe.
Long time before the Romans the magnifying lenses were in use.
https://www.academia.edu/467038/The_Use_of_Magnifying_Lenses_in_the_Classical_World
https://www.journals.uchicago.edu/doi/10.2307/505216
On the front cover of 'The Crystal Sun' by Robert Temple, there is an image of a very ancient Greek... looking through a telescope...
Compared to a hundred years ago, it seems as though almost everybody is near-sighted these days. Is that because of increased close work stemming from more years of formal education?
Long time before the Romans the magnifying lenses were in use.
https://www.academia.edu/467038/The_Use_of_Magnifying_Lenses_in_the_Classical_World
https://www.journals.uchicago.edu/doi/10.2307/505216
On the front cover of 'The Crystal Sun' by Robert Temple, there is an image of a very ancient Greek... looking through a telescope...
Compared to a hundred years ago, it seems as though almost everybody is near-sighted these days. Is that because of increased close work stemming from more years of formal education?