SNELLEN TEST Meaning and
Definition
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The Snellen Test, named after Dutch ophthalmologist Herman Snellen, is a standardized vision test used for evaluating visual acuity or sharpness of vision. It is commonly conducted during routine eye examinations and screenings by eye care professionals such as optometrists or ophthalmologists.
The Snellen Test utilizes a chart known as the Snellen Chart, which consists of several lines of uppercase letters or symbols arranged in decreasing size. The chart is typically displayed at a standardized distance of 20 feet or 6 meters from the individual being tested. During the test, the person is asked to stand or sit at the specified distance and identify the letters or symbols on the chart from top to bottom, starting with the largest line and progressing to smaller ones. The test measures visual acuity by assessing the smallest line of text that can be accurately read.
The results of the Snellen Test are indicated by a fraction, with the numerator representing the viewing distance at which the chart was read and the denominator indicating the distance at which a person with normal vision could read the smallest line. For example, a result of 20/20 means that the person being tested can read at 20 feet what a person with normal vision can read at 20 feet. However, a result of 20/40 would mean that the person being tested can only read at 20 feet what a person with normal vision can read at 40 feet.
Overall, the Snellen Test is a widely used and effective tool for measuring visual acuity, aiding in the diagnosis of various visual impairments, and determining the need for corrective lenses or further eye care interventions.
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Etymology of SNELLEN TEST
The word "Snellen" in "Snellen Test" refers to Dr. Hermann Snellen, who was a Dutch ophthalmologist. He developed the Snellen chart, which is commonly used to measure visual acuity and assess a person's ability to see things clearly at different distances. The Snellen chart consists of rows of letters or symbols that decrease in size as you move down the chart. The Snellen Test is named after Dr. Snellen because of his contribution to the field of eye testing.
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