Visual acuity is the capacity to interpret information brought to the brain through sight and determines the quality of vision. It is evaluated through simple tests performed by a general practitioner (roughly, the famous poster of black letters on a white background) or evaluated more precisely with more rigorous tests performed by an ophthalmologist whose aim is to verify, for example, the slightest distance observed between two distinct points. Visual acuity can be different for each of our two eyes. Normal acuity is 20/20. When the results are lower, specialized tests show what the vision problems are.
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. Translated by Jeff