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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.
A visual acuity chart is used to test distance visual acuity. It uses capital letters of different sizes to test vision in literate adults. The test is conducted at 6 metres (20 feet in USA).The test result is given as a fraction that indicates the distance in metres at which that row of the chart can be read by a normal eye.he bottom number represents the size of the letter seen. The larger the bottom number the larger the letter on the chart (E.g. 6/48 indicates a bigger letter than 6/12). Normal visual acuity is recorded as 6/6 (20/20 in USA).