Now my question is, how could my retina have 530 ppi if I can not identify single pixels on a 326 ppi device? Assuming your retina does indeed have 530ppi or s

Now my question is, how could my retina have 530 ppi if I can not identify single pixels on a 326 ppi device? Assuming your retina does indeed have 530ppi or so (there's no guarantee that all retinas are ideal), there still remains the question of whether your eyes' focusing systems are in good enough shape to produce that resolution, whether any vision flaws are corrected fully by your glasses/contacts, etc. (edit to add one more correction) > 53*60/.3 = 10600 ? Why did he multiply it times 10? Is this a calculation error, or am I just missing something? It's your calculation error; you are multiplying by .3 instead of dividing by .3.