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A comment on Declining eyesight improved by looking at deep red light. Parent comment

Re:Declining eyesight improved by looking at deep red light by amelius on Friday August 07, 2020 @09:34AM (#24081613)
Your pupils become narrower and probably stay that way for a while when you open your eyes. This gives you a sharper image.

Look up "pinhole camera" for a good explanation of this effect. These cameras don't even need a lens!

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Re:Declining eyesight improved by looking at deep red light by aliswe on Friday August 07, 2020 @10:06AM (#24081962)
Yes, I asked an optician and he said the same thing. He said pinhole effect. It goes away after a few minutes.
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