Is all bad eyesight genetic?
I didn't need to wear glasses until I was in my later 30s, long after I had entered the period where I could reproduce and pass on any genes.
Remember, it is only genes that that effect the likelihood of reproducing that are a big issue.
In addition, in a cooperative society many eyesight defects can also be an advantage. Those who are near sighted may well be better at detailed tasks that require close vision. Others who are far sighted may be better as lookouts and perhaps hunters.
Even long ago it seems that most eyesight issues would have been relatively neutral as far as evolution was concerned. Perhaps today we can compensate and so make life quality better over a longer period but I don't see how we are passing along many bad eyesight genes that would not have gotten passed on in the past as well.
Anyone so limited that they can only spell a word one way is severely handicapped!
™ Version 4.2
