Multiplied by 2, we find our total viewing angle. The resolution of our eyes is 12 vertical lines per arc angle (one line per arcminute for 20/20 acuity) times 2. Now 28 degrees x 12 lines x 2 = 672.

So the theoretical limit on how much detail the human eye can actually process may be more of a guideline than rule. Dr. Martinez-Conde points out that the enigma encompasses all types of perception.

Take the human eye: with a single lens, it achieves a huge effective field of view (around 120 degrees) ... The human eye shifts direction by a small angle several times per second.

For example, the precision-lens manufacturer Zeiss states that its Planar 50-mm lens is “equal to the human eye.” Many artists have taken up 50-mm lenses to render ordinary, everyday experience.