I have 20/20 vision. Both my sisters wear glasses. There is a theory that if you spend a lot of time indoors when you’re young your eyes aren’t really trained to see much further than the inside of a room and you end up short sighted, and I think the situation in my family supports this because both my sisters spent their time inside reading books while I was running around outside in the mud http://www.bbc.co.uk/news/health-15427954
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