The numerator in the Snellen part demonstrates the separation at which outline is kept from the patient or a separation at which the patient can read the letters, the denominator means the separation at which this letter can be perused by a man having ordinary visual sharpness.
In the event that visual sharpness is 6/9
6 signifies the separation at which the graph is kept and 9 means the separation at which an ordinary individual would read this letter.
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