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Visual Acuity (VA) commonly refers to the clarity of vision. Visual Acuity is dependent on optical and neural factors, i.e., (i) the sharpness of the retinal focus within the eye, (ii) the health and functioning of the retina, and (iii) the sensitivity of the interpretative faculty of the brain.isual acuity is often measured according to the size of letters viewed on a Snellen chart or the size of other symbols, such as Landolt Cs or the Tumbling E. In some countries, acuity is expressed as a vulgar fraction, and in some as a decimal number.
Near Vision Testing. There are many charts for assessing near acuity. The metric, or M system is a linear scale of reading visual acuities, unlike the Jaeger or point notation, and is easily tested and recorded at any distance. 1 M letters are 1.45 mm tall and are roughly equivalent to magazine print.