In theory, the human eye has a resolution of about 1/60th of a degree (treating the eye as a 2 mm circular aperature). 1/60th of a degree is about.0003 radians. So at a distance of 12 inches, you can resolve two things that are
D= 12 *.0003 =.003 inches
apart. So viewed from 12 inches away, a monitor with more than 1/.003 = 287 pixels/inch exceeds what your eye can resolve. The 22" Viewsonic has 204 pix/inch and the Apple 30" has about 94 pix/inch.
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In theory, the human eye has a resolution of about 1/60th of a degree (treating the eye as a 2 mm circular aperature). 1/60th of a degree is about .0003 radians. So at a distance of 12 inches, you can resolve two things that are
.0003 = .003 inches
D= 12 *
apart. So viewed from 12 inches away, a monitor with more than 1/.003 = 287 pixels/inch exceeds what your eye can resolve. The 22" Viewsonic has 204 pix/inch and the Apple 30" has about 94 pix/inch.