If I use 1 arcminute instead, the scale factor is smaller, about 3438. So let’s convert that to inches to see how small a pixel the human eye can resolve at a distance of one foot: 12 inches / 3438 = ...

Human eyes can’t decipher individual pixels from far away—this video shows why. A version of this story appears in the October 2018 issue of National Geographic magazine. Short for “picture ...

Chapter 1, "The formation of the human eye," focuses on overall eye embryology ... for those of us over 50 of the way accommodation, resolution and other functions change over a lifetime.