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Is "visual acuity" a thing?

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For visual acuity to make any sense on a computer monitor you also need to consider the size of the monitor and distance to the monitor.

For instance 20/20 sitting 27" away from a 27" 1440p display will equal 0.85 pixels and a sensitivity of about 2.3.

Sitting 27" away from a 24" 1080p display will instead be 0.72 pixels and a sensitivity of 1.95.

If you're instead 20" away the numbers will be 0.63 pixels and 1.71 sens for 27", and 0.53 pixels and 1.44 sens for 24".

If these factors are known visual acuity can be calculated indeed. 

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