# Keyword Analysis & Research: visual acuity definition

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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.

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.

What is normal visual acuity?

On the Snellen scale, normal visual acuity is called 6 / 6, which corresponds to the bottom or second bottom line of the chart. If you can only read the top line of the chart then this would be written as 6 / 60. This means you can see at 6 metres what someone with standard vision could see from 60 metres away.

What does visual acuity mean to your eyesight?

Visual acuity is the clarity of your eyesight, measured by your ability to identify letters or numbers on a standardised eye chart from a specific viewing distance. Visual acuity is a static measurement, meaning you are sitting still during the testing and the letters or numbers you are viewing also are stationary.