Ocular Resolution
The human eye is a limiting feature of many systems, when the goal of the system is to present data to humans for processing.
For example, in a security or air traffic control function, the display and work station must be constructed so that average humans can detect problems and direct corrective measures. Other examples are when a human is using eyes to carry out a critical task such as flying (piloting by visual reference), driving a vehicle, and so forth.
The best visual acuity of the human eye at its optical centre (the fovea) is less than 1 arc minute per line pair, reducing rapidly away from the fovea.
The human brain requires more than just a line pair to understand what the eye is imaging. Johnson's Criteria defines the number of line pairs of ocular resolution, or sensor resolution, needed to recognize or identify an item.
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