|
What Seamus and Rosa wrote is absolutely correct but I always wondered whether we do experience evolution on our eyes due to 'technology'
In the past having bad eyesight would have meant that you can't hunt/work productively = can't provide for a family/feed yourself = don't produce offspring = genes for bad eyes are an evolutionary disadvantage
We had glasses since the middle ages and they were more readily available since a few hundered years now so having bad eyes no longer prevents you from having a job and therefore kids. Wouldn't that mean that the bad eyes genes are now more likely to be passed on?
I know that seeing more people with glasses in modern times is obviously a function of more testing & cheap access to glasses, but some of my friends are seriously blind without them and I can't imagine them functioning in a medieval society let alone as a hunter/gatherer.
Thoughts?
|