Myth or reality?

[Leukocyte]

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Is it true that spending long hours in front of the TV or computer monitor decreases your visual acuity? Is this just a myth and not based on any scientific facts? 😕

Thank you in advance.

 

[r_salis]

Close-work allegedly causes myopia over time -- college students often graduate needing new glasses -- but I'm not sure that anyone knows for certain that it is pure cause-and-effect relationship.