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Change in visual acuity is calculated directly by subtracting LogMAR data, while the average visual acuity is obtained with the arithmetic mean value of the LogMAR data. The mean acuity expressed in LogMAR units can be transformed into a decimal chart for a more comprehensive result. To calculate the average visual acuity directly from the decimal data, the geometric mean value must be used instead of the arithmetic mean value.What is best corrected visual acuity?
Best Corrected Visual Acuity (BCVA) Measurement of the best vision correction that can be achieved, such as glasses, as measured on the standard Snellen eye chart. For example, if your uncorrected eyesight is 20/200, but you can see 20/20 with glasses, your BCVA is 20/20.What does 20 200 vision mean?
Having 20/60 vision means that you must be at 20 feet to see what a person with normal vision can see at 60 feet. It doesn’t mean you have perfect vision. Nor does it give details on other important aspects of sight like side or peripheral vision, how you see colors, or depth perception.