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anon answered on 12 Jun 2017:
Epidemic is used for some things like obesity, which are not infectious but are increasing. I restrict the use of epidemic to increases of an infectious disease in a particular group of people or particular location.
I am not aware of any infectious cause affecting long-distance eye sight. Of course things like the age distribution of the population (more people are living longer) and the widespread use of screens may well affect the prevalence of vision problems.
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