Comment Maybe for perfect vision, but not for 20/20. (Score 4, Informative) 476
For a human eye with excellent acuity, the maximum theoretical resolution is 50 CPD[32] (1.2 arcminute per line pair, or a 0.35 mm line pair, at 1 m).
...A resolution of 2 arcminutes per line pair, equivalent to a 1 arcminute gap in an optotype, corresponds to 20/20 (normal vision) in humans
If my math is correct then this is 60% worse than the 'excellent' eye; so the figure of 477 ppi at 12 inches is 286.2ppi; so well within the retina display's capability.