Posted: 11/2/2016 8:36:00 PM EDT
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I have 20/300 vision and have worn corrective lenses since the 3rd grade.
I rarely ever experience the world without my contacts or glasses. But holy shit, when I take my glasses off, I'm surprised at how poor my vision is. Everything is a blur and I can barely distinguish anything. I'm fecking helpless without glasses. It begs the question, shouldn't natural selection have made me impossible to exist? How wasn't my shitty vision gene erased back when people were running away from lions? I figure all the early humans with shit vision were eaten or left behind 
Discuss 
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You're pretty much right.
Although to my knowledge good eyesight is a recessive gene. Both my parents wear glasses and I do not. If you put a middle school science teacher to solve this they would say that both my parents have Xx chromosomes and I got xx. ...But then again I played hooky half of high school so there's that.
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It's not really genetic. To a degree, yes - but not entirely.
http://www.nature.com/news/the-myopia-boom-1.17120 Early humans didn't have books and computers. |
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Quoted:
This. If you're small, weak and have diseases, in today's world you can still pass on your genes. Quoted:
Quoted:
Evolution is over dude, we all survive now. Devolution is the in thing... This. If you're small, weak and have diseases, in today's world you can still pass on your genes. I am ashamed of myself 
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