Accuracy
Among the array of visual assessment picture tests that exist, the LEA symbols tests are the only tests that have been calibrated against the standardized Landolt C vision test symbol. The Landolt C is an optotype that is used throughout most of the world as the standardized symbol for measuring visual acuity. It is identical to the "C" that is used in the traditional Snellen chart.
In addition to this, the LEA symbols test has been experimentally verified to be both a valid and reliable measure of visual acuity. As is desirable of a good vision test, each of the four optotypes used in the symbols test has been proven to measure visual acuity similarly and blur equally as well, supporting the test's internal consistency.
A study published in Acta Ophthalmologica Scandinavica in 2006 showed that the Lea Symbols 15-line folding distance chart is clinically useful in detecting deficiencies in visual acuity in preschool children. The study, which compared visual acuity diagnoses from Lea symbols tests to those obtained via ophthalmological examination, revealed that the Lea symbols chart provided an accurate and sufficient assessment in 95.9% of the 149 preschool-age children tested. This suggests that Lea tests can be used confidently as an alternative to more costly and time-consuming pediatric tests of visual acuity.
Read more about this topic: Lea Test
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