While more can be said about poor eyesight in history, you should bear in mind that such high numbers of myopia in humans are a recent phenomenon, as stated in this r/AskScience answer by u/albasri. Myopia is apparently linked to staying indoors, as the article in u/albasri's post explains.

In addition to the fact that as u/iwaka says about myopia being a relatively recent phenomenon (most likely brought on by lack of exposure to bright light), it's also important to note that for most applications it just matters a lot less for most of history whether you have distance vision. If you think of the applications people need corrective lenses for today, most of them simply didn't exist for most of recorded history. Most people need corrective lenses for two things: driving and reading small print at a distance. Obviously driving isn't important - you can navigate when walking without having to resolve fine details like road signs. And when most of the population is not literate, reading is a secondary concern. So, for the most part, if you did happen to be unlucky and have bad eye-sight, it wouldn't make a huge difference.