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Originally Posted by multiweb
Would that be good for your vision, long term? You bypass most of your eye function and project directly onto the retina.
Your eye will lock focus to what?
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No worse than looking through a telescope - you focus at infinity while the gadget's optics does the rest.
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Also shining a light directly into your eye. What about the pupil function to limit the amount of light based on illumination?
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If it's too bright, turn down the brightness! It's the image brightness on the retina that your brain uses to judge overall brightness - pupil contraction is merely a reflex reaction. In this case, it looks like pupil contraction would have minimal effect, so turn down the brightness.
An LED isn't going to have enough power to damage the retina. If you go to an optometrist, and have your eyes dilated, the optometrist then shines a bright light into your eye during the examination. Now, that's so bright it hurts, but it's still not powerful enough to damage your retina.
Edit:
Just saw Dunk's post - beat me to it!