When you go to the optometrist they test your reading by flicking you through many different lenses. Of course there are a finite number of lenses in their possession, so they can only correct your vision to some precision. if one could in principle make custom lenses precisely for a person’s eye, could one theoretically have perfect vision
? and how far would you be able to resolve images on a clear day?
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> if one could in principle make custom lenses precisely for a person’s eye
They already do. There’s a lot of parameters the optometrist is fiddling with and often it’s not just a matter of swapping in a different focus lens. For example my new glasses have the same value lenses as before but at a slightly different angle and it’s noticeably better.
> and how far would you be able to resolve images on a clear day?
At a clear *night*, couple million kilometers. You can see the moon pretty well, yes?
The limit isn’t distance, it’s angular resolution. Each receptor in your eye receives light from an expanding cone-ish shape that covers about 0.02 degrees vertically and horizontally. With 1x magnification (natural vision), that’s the limit of what you can see – if the object only covers one of those cones at the distance it is, you see a dot, if it fals into more of the cones you get to see a tiny blurry shape etc.
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