Maybe there is no direct evidence that reading in the dark ruins your eyesight. There is however evidence that how you use your eyes during development affects their growth. For example: "Spectacle lenses alter eye growth and the refractive status of young monkeys" http://www.nature.com/nm/journal/v1/n8/abs/nm0895-761.html . So it is definitely possible that repeated strain on the eyes caused by poor light could affect their development.
In addition, we need to find an explanation for the high number of people that need corrective lenses these days. I, for example, would not have survived a few thousand years ago - I can't tell a cow from a lion. In my opinion, this has to do with how we use our eyes during their development.
Top Seven Health Myths
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