SvennoJ said:
20/20 92" 1920x1080 143.5" (I sit at 135") This uses the old 60 pixels per degree for 20/20 vision. (To calculate pixels per degree for 1080p -> Distance * 38.45 / Diagonal size) It has already been proven that the human eye can benefit from better pixel density all the way up to 200 pixels per degree (That's where double blind tests turn into pure guessing at which has better picture quality) It's not about not being able to see individual pixels, but about seeing a smooth picture with no traces of the pixel grid. In my experience going to between 100 and 120 pixels per degree gives a great picture. Still needs some AA but it looks almost life like. Sit twice as far away as this calculator suggests for best results, or enter 20/10 vision.
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I don't doubt that th ehuman eye can probably resolve better than what this chart may suggest. But I sincerely feel that if you stay at the suggested distance from the screen (in relation to your screen size and resolution) to be able to make out the pixel grid on your display becomes very tasking. Like in my case I have to start focusing into a super specific area on the screena and squint..... I strongly doubt anyone uses their displays like that.