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Before the invention of the eye glasses, how (if at all) did civilizations diagnose vision issues, how were these people treated, & what did they determine to be the cause of near and far sightedness?

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
Before the invention of the eye glasses, how (if at all) did civilizations diagnose vision issues, how were these people treated, & what did they determine to be the cause of near and far sightedness?	515
Did people 100 years ago dream of living in earlier decades too?	86