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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

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.

moron4hire 6y ago
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.
- wtallis 6y ago
  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.
- hellofunk 6y ago
  > 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.
  - PaulHoule 6y ago
    I think the commentator meant "depth of field"
    - moron4hire 6y ago
      yes, didn't have my first coffee yet
amelius 6y ago
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!
- aliswe 6y ago
  Yes, I asked an optician and he said the same thing. He said pinhole effect. It goes away after a few minutes.
abledon 6y ago
dr andre huberman on JRE a couple days ago talked about this as well as OP's article.
bdjfkrkrk 6y ago
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/ https://pubmed.ncbi.nlm.nih.gov/29371008/

moron4hire 6y ago

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.

wtallis 6y ago
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.
hellofunk 6y ago
> 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.
- PaulHoule 6y ago
  I think the commentator meant "depth of field"
  - moron4hire 6y ago
    yes, didn't have my first coffee yet

amelius 6y ago

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!

aliswe 6y ago
Yes, I asked an optician and he said the same thing. He said pinhole effect. It goes away after a few minutes.

abledon 6y ago

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

bdjfkrkrk 6y ago

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