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Share to: Although the human eye and brain can interpret up to 1000 frames  per second, someone sitting in a chair and actively guessing at how  high a frame rate is can, on average, â¦ interpet up to about 150  frames per second. There is no appreciable difference between 150  FPS and anything higher.
Young adults with 20/20 vision can often focus at 4 to 6 inches. At 6 inches, they can see detail at 600 pixels per inch or 300 line pairs per inch. As you age, your lenses become less resilient and the focus distance increases. At about 50 years, the average minimum focus distance is about a foot corresponding to 150 line pairs per inch or 300 pixels per inch. These numbers reflect good light and high contrast scenes. Generally, under more typical conditions, people don't see this well. --.