Southwest Medical

The Eye Chart Lea Symbols are a type of vision chart used to test visual acuity, particularly in children and individuals who may have difficulty reading standard letters or numbers. The chart features a series of symbols in various sizes, such as circles, squares, triangles, and apples, rather than letters or numbers.

The Lea Symbols chart is often used by eye doctors, optometrists, and ophthalmologists to measure the visual acuity of individuals who may not yet be able to read or recognize letters or numbers, such as young children or individuals with cognitive impairments. The symbols on the chart are designed to be easily recognizable and distinguishable, even for those who may not have a full understanding of the shapes and sizes of letters or numbers.

Like other vision charts, the Lea Symbols chart is typically displayed at a distance of 20 feet (6 meters) and the individual being tested is asked to identify the symbols on the chart. The smallest symbols that can be identified determine the individual's visual acuity, which is expressed as a fraction, such as 20/20, indicating that the individual can see at 20 feet what a person with normal vision can see at 20 feet.

Overall, the Eye Chart Lea Symbols are a useful tool for testing visual acuity in individuals who may have difficulty with traditional vision charts.

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When checking visual acuity, one eye is covered at a time and the vision of each eye is recorded separately, as well as both eyes together. In the Snellen fraction 20/20, the first number represents the test distance, 20 feet.

The second number represents the distance that the average eye can see the letters on a certain line of the eye chart. So, 20/20 means that the eye being tested can read a certain size letter when it is 20 feet away.

If a person sees 20/40, at 20 feet from the chart that person can read letters that a person with 20/20 vision could read from 40 feet away. The 20/40 letters are twice the size of 20/20 letters; however, it does not mean 50% vision since 20/20 sounds like it is one half of 20/40. If 20/20 is considered 100% visual efficiency, 20/40 visual acuity is 85% efficient.

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