I wouldn't have survived 5000 years ago. I am as shortsighted as a mole and the very first sabre tooth tiger would have had me for breakfast. (Because I would have thought he's my pussycat ) Not to talk about tarantulas and canyons.

But "weakness" is a relative term and I thought Darwin did not talk about "survival of the strongest" but "survival of the fittest" which means of people (human or animal) who adapt best to changing circumstances.

And the development of glasses and laser surgery was for sure a good adaptation to the circumstances of being shortsighted.