Understanding Anti-Aliasing

[WereKitten]

SvennoJ said:

Studies have shown people can still tell a difference upto 100 cycles per degree, or 200 pixels per degree.
So a 52" diagonal screen at 80 inches insn't 'retina' until you have 6491 x 3651 pixels. That's when anti aliasing becomes irrelevant.
At 30 cycles per degree you start to lose the ability to see the pixels themselves, but you will still see aliasing occuring.
...

Thanks for the quantitative info. I referred in my post to "Steve Jobs' magic number" because Zappykins started from 300 DPI, so I thought that's where he was starting for his calculations, but I'm no optometrist :)

I have read from multiple sources that a 20/20 sight maps to a minute of arc due to the way the Snellen charts are built. For example the 20/20 samples are built on 5x5 grids of 5 minutes of arc total width, thus they can contain 5 "pixels" or 2.5 cycles per main direction.

Your numbers point to 3x as much, but are they for statistical outliers - i.e. exceptional sight - or for the "normal" vision?