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i am -4 and lost my glasses; however, i still keep my -2 glasses. on a sunny day, outdoor, the -2 glasses works just fine. not 99% eagle eye precision, but lik
by hellelujah 5y ago
i am -4 and lost my glasses; however, i still keep my -2 glasses.
on a sunny day, outdoor, the -2 glasses works just fine. not 99% eagle eye precision, but like 90% precision, overkill to see car plates and directions.
does the intensity of light from sun cut -2 from -4 requirement?
- legerdemain 5y agoYes, in bright light your pupils are narrow enough to create a pinhole focus effect. (It works the same way with a camera: stop down your camera lens enough and you get infinite depth of field with every visible object in focus.)
- walterbell 5y agoThis is also why "dark mode" is counterproductive when wearing glasses. Better to adjust ambient room lighting to match screen brightness.
- legerdemain 5y agoI don't understand the connection. Can you explain?
- walterbell 5y agoIn a dark room, your pupils will dilate and impact clarity of vision. If the room is well lit and screen brightness is matched to ambient light, there will be no effect on pupil dilation. More details: https://endmyopia.org/why-vision-is-worse-at-night-and-on-cloudy-days-too/ https://endmyopia.org/why-vision-is-worse-at-night-and-on-cl...
- legerdemain 5y agoOh, this is more "believe your way to a lower prescription" myopia skeptic stuff, isn't it. Yeah, sure, and in a pinch you can just glance up at the sun for a second to "improve" your vision.
- deleted 5y ago[deleted]
- walterbell 5y agoThe linked page's specific content about night vision is unrelated to the rest of that website. Did you identify anything incorrect about the page's statements on night vision?