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Frequently Asked Questions

How to calculate vision acuity?

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.

How do you test visual acuity?

Distance visual acuity is a measurement of your degree of vision loss. It is measured by testing the smallest object that you can recognize, usually on a chart located 20 feet away. This measurement is recorded as a fraction, with 20/20 being considered normal vision.

What does vision acuity mean?

The visual acuity test is used to determine the smallest letters you can read on a standardized chart (Snellen chart) or a card held 20 feet (6 meters) away.

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