A lot of people seem to over look the fact that being nearsided or farsided is a change in focal length, not a straight degridation of vision. Someone with "per

A lot of people seem to over look the fact that being nearsided or farsided is a change in focal length, not a straight degridation of vision. Someone with "perfect" 20/20 vision can't see as far as many far sided people, and can't see as small and fine details as someone nearsided. Before the invention of lenses both could be pretty valuable traits, but of course weren't super common and harder to identify at the time too.