Declining eyesight improved by looking at deep red light

Re:Declining eyesight improved by looking at deep red light by progfix on Friday August 07, 2020 @08:09AM (#24081000)

I am not sure if this is related, but I am heavily short sighted and facing the sun with closed eyes for a couple of minutes sharpens my eyes.

I suspect it is just because I tend to spend too much time in dark rooms and in front of screens and being in the bright sun "fixes" that for a while.

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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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Re:Declining eyesight improved by looking at deep red light by moron4hire on Friday August 07, 2020 @08:20AM (#24081061)

It's forcing your pupils to constrict. Decreasing the aperture size on a lens increases the field of view. So, while your eye might not be able to accommodate at the correct distance given the current convergence point, there is more room for error. It's a fairly common method in photography, in cases where one might have difficulty getting a correct focus on a subject. It's not a "fix", but a compensation.

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Re:Declining eyesight improved by looking at deep red light by wtallis on Friday August 07, 2020 @08:35AM (#24081158)

Depth of field is what expands with smaller apertures, not field of view. The former is the range of distances that are "in focus", and the latter is the angular width of the the scene.

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Re:Declining eyesight improved by looking at deep red light by hellofunk on Friday August 07, 2020 @09:06AM (#24081356)

> Decreasing the aperture size on a lens increases the field of view.

No, the aperture has no effect on the field of view. They are orthogonal features of how a lens works.

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Re:Declining eyesight improved by looking at deep red light by PaulHoule on Friday August 07, 2020 @09:08AM (#24081365)

I think the commentator meant "depth of field"

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Re:Declining eyesight improved by looking at deep red light by moron4hire on Friday August 07, 2020 @10:31AM (#24082267)

yes, didn't have my first coffee yet

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Re:Declining eyesight improved by looking at deep red light by bdjfkrkrk on Friday August 07, 2020 @11:10AM (#24082683)

There's a theory that one cause of myopia is lack of high intensity light due to indoor living:

https://pubmed.ncbi.nlm.nih.gov/29371008/

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Re:Declining eyesight improved by looking at deep red light by abledon on Friday August 07, 2020 @10:06AM (#24081954)

dr andre huberman on JRE a couple days ago talked about this as well as OP's article.

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