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Is there any research (not wild conjecture) on staring at a screen strapped to your face for extended durations? I am already near sighted from having spent a lifetime focusing on a screen an arm's reach away. What happens if there is no chance of errantly focusing on other objects and forcing my eyes even a modicum of daily activity?

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The optics put the virtual image (if you remember physics class) of the screen about 1.2 meters in front of your eyes, not inches. Your eyes lens/focus muscles will be set just as if you were focused on something actually 1.2 meters.

are you sure near-sighting is because of monitors and not because of genetics?

research has found a bigger correlation with indoor time in early years than computers

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