Ok I get we all look at small letters and images on screens and paper these days. Is this why in the last 150 years or so millions and millions of humans need spectacles? Is it because we are meant to be looking at things from a distance rather than nearby so our eyes haven’t caught up?
In: Biology
The latest research shows the need for glasses is strongly linked to lack of periodic exposure to bright sunlight and UV, particularly during the developing years. It has nothing to do with watching TV or computer screens.
As to how we got by in the past: Basically you didn’t. I just read diaries from the original south pole expeditions: those who couldn’t see long distance basically were excluded from becoming navigators and had to be put under the care of a navigator, and those who couldn’t see short distance were basically excluded from book-work/reading/writing etc. You see the same thing in writings of the Romans. Eye tests were mandatory for a lot of positions.
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