What you are experiencing is called presbyopia
and is not related to computer use but rather to living long enough for your eyes natural ability to focus up close to become weak. It happens to everyone eventually and is called presbyopia.
Here is a good article on this issue:
The best thing to do is buy a bunch of reading glasses
at the dollar store and leave them all over the house. This is what I do and it works well :)
Does this make sense to you?
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