Eye Chart
An eye chart measures the visual acuity.
They come under different names like the Snellen chart, Landolt C, and the Lea test.
They use test symbols - generally the letters - that are adjusted in various rows, every row supporting a different size of the test symbol.
The top row is of the biggest size supporting only one big symbol, which is supposed to be recognized from the farthest of the distance generally set to be 200 feet.
The last row supporting the smallest symbols has often 9 to 14 of them that are supposed to be recognized from a distance of as near as 10 feet.
If you don't recognize letters, you don't need worrying. There are picture charts also available supporting pictures in varying sizes as you go scanning down the rows.
The Tumbling E charts use only one single letter, i.e., the capital E that keeps rotating with every repetition of it in the same size horizontally as well as in the varying sizes vertically. You only need recognizing its rotation from a distance.
The Landolt C chart is similar with the only difference that it uses a circle with a segment missing. You need telling the direction from where the segment is missing.
All these charts are very popular among the people who want to be on a constant vigil as far as their eyesight is concerned, making it a part of their normal eye care routine.
Why not have a chart for yourself today!
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