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Human Eye Resolution
Use slide-control to select distance between an observer and an object (like artwork, tv screen, printed material). The purple & teal boxes display maximum resolving power within various parts of the eye. For example, when viewing something 18-inches away in bright sun, the human eye can barely discern 400ppi or details the size of 1/400-of-an-inch (0.0025") under ideal conditions and contrast. The first purple box (cones in foveola), is the highest resolution part of the eye and is the only figure needed for most print/design applications.

Viewing Distance
Smallest Perceivable Spec
Ambient Light
Cone Resolution
(sharp detail & colour)
Rod Resolution
(low light & motion)
1° Foveola area can discern fine detail
4° Fovea area can read text
30° Macula area can recognize shapes
60° area can determine colours
120° Peripheral area can detect motion
An example involving HDTV
Start with a television's resolution like 720, 1080, 2160(4K), 4320(8K), and divide it by 49% of the diagonal screen size (in inches). For example, if you have a 60" Ultra-HD (4K) TV, you would take the lines of resolution (2160) and divide by 49% of it's size (60 x 0.49 = 29.4), so that's 2160 ÷ 29.4 = 73.46ppi (pixels-per-inch on the TV's screen). Next, set the above slide-control to the distance between your television and seating area to see how many ppi are perceivable. In our example, at 8-feet away (or less) your retinas are getting every dot, and at 16½-feet away a 60" 4K and a standard 1080P will appear the same.