this post was submitted on 20 Mar 2026
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No Stupid Questions
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Almost like as you get older, your low light vision worsens dramatically.
Kinda makes sense, altho I wonder if they also just dont notice or feel the impulse that they can just change whatever the default lighting situation is also
Pupils dilate in darker lighting, the bigger the aperture, the narrower the depth of field get. if you have old eyes that aren’t as good at focusing anymore, narrowing the aperture will cheat that and allow sharper focus, but you need more light to do it.
You can see this if you have an old SLR camera with DOF preview, and focus on a scene with object both close and far. As you close down the aperture (move it to a higher number say 2->16), you’ll see more and more of the scene simultaneously in focus, but it will also get darker and darker.
That’s why old people make rooms brighter. It’s easier on their eyes if they wish to see things in focus.
Edited for spelling
Actually, my one eye nearsighted and i noticed if I physically focus it by using my fingers to create a smaller "aperture", i can actually see farther with the nearsighted one!
Go find some cheap pinhole glasses. They really demonstrate how vision is not just a mechanical thing.
Nice, squinting does a similar thing with your eyelids.
Ya that too, thats probably closer to what I mean actually