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  2. A Snellen test is an eye chart that can be used to measure visual acuity. Find out more about how opticians use a Snellen test and download the chart here.

    • The Standard Eye Chart
    • Visual Acuity Testing
    • How to Read Eye Chart Results
    • Eye Chart Versions
    • Summary

    The Snellen eye chart is made of letters used as "optotypes," or symbols designed for vision testing. Its name comes from Dr. Hermann Snellen, who invented the eye chart in 1862. This standard chart consists of 11 lines of block letters, beginning with a large single letter on the top row. The number of letters on each row increases moving from top...

    The Snellen eye chart is read by covering one eye and reading aloud the letters on the chart, beginning at the top and moving toward the bottom. The smallest row of letters that the patient reads accurately determines visual acuity in the uncovered eye. The other eye also is tested, and both eyes are tested together. The results are based on what y...

    The results of your acuity exam (chart reading) will help to diagnose the quality of your eyesight. Your vision results (acuity) will be expressed as a fraction. Fractions are shown to the left of each row and identify how well you can see. The expression of results, such as 20/40 vision or 20/25 vision, will depend on how far down you were able to...

    Various types of eye charts are available besides the Snellen. Some use pictures or patterns to measure visual acuity instead of letters. Certain charts are used to measure distance vision and others measure near vision. There are several versions of the Snellen eye chart for people, such as young children, who cannot read the letters of the alphab...

    The standard Snellen eye chart remains the most used in clinical practice today.Snellen results are based on what you can see from 20 feet away. Other versions of this chart and alternate visual acuity charts are available. While you can access versions of the Snellen eye test chart online, it's best to have regular examinations performed by an eye...

  3. Oct 12, 2021 · The Snellen eye chart is the most common method used by eye doctors to measure visual acuity, which is how clearly a person can see. During an eye exam, patients will read the Snellen chart from 20 feet away. The farther down the chart the patient can read, the better their visual acuity is.

  4. Feb 27, 2019 · Snellen eye chart. The classic example of an eye test is the Snellen eye chart, developed by Dutch eye doctor Hermann Snellen in the 1860s. How a Snellen chart and a "tumbling E" chart might look at your eye doctor's office. Today, there are many variations of the Snellen test. Most of them include: 11 rows of capital letters.

  5. 6 days ago · Eye charts are the most common type of visual acuity test. They show several rows of optotypes (letters, numbers, or symbols) progressively smaller towards the bottom. The most frequently used visual acuity tests are the Snellen Eye Chart (left) and the Random E Chart (right).

  6. A Snellen chart is an eye chart that can be used to measure visual acuity. Snellen charts are named after the Dutch ophthalmologist Herman Snellen who developed the chart in 1862 as a measurement tool for the acuity formula developed by his professor Franciscus Cornelius Donders.

  7. Nov 8, 2022 · The Snellen eye chart: The Snellen visual acuity test is probably what you’re picturing if you think of a vision test. It’s a wall chart with rows of letters printed on it. The letters are big at the top, and each row gets increasingly smaller the farther down on the chart you look.

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