How To Use Snellen Chart

What is how to use snellen chart?

A snellen chart is a chart used by eye care professionals to measure visual acuity. It consists of multiple rows of letters or symbols of varying sizes. The purpose of using a snellen chart is to assess the clarity and sharpness of a person's vision. By standing a specific distance from the chart and identifying the smallest line of letters or symbols they can read, individuals can determine their visual acuity.

What are the types of how to use snellen chart?

There are different types of snellen charts available, each designed for specific purposes. The most commonly used snellen chart is the Standard Snellen Chart, which displays 11 rows of letters decreasing in size. Another type is the Tumbling E Chart, which is used for individuals who can't read or recognize letters. It consists of the letter E facing in different directions. The Landolt C Chart is used for individuals who can't read or recognize letters but can identify shapes. It displays the letter C facing different directions.

Standard Snellen Chart
Tumbling E Chart
Landolt C Chart

How to complete how to use snellen chart

To complete a snellen chart test:

01
Stand or sit a specific distance away from the chart, usually 20 feet or 6 meters.
02
Cover one eye with an occluder or your hand.
03
Read or identify the letters or symbols on each row, starting from the top.
04
Take note of the smallest line of letters or symbols you can read accurately.
05
Repeat the test for the other eye.
06
Consult an eye care professional to interpret the results and discuss any necessary actions.

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Questions & answers

Hold the near vision test card about 14 inches (35 centimeters) from your eyes. Do not bring the card any closer. Read the chart using each eye separately as described above. Record the size of the smallest line you were able to accurately read.
Procedure Ensure good natural light or illumination on the chart. Explain the procedure to the patient. Wash and dry the occluder and pinhole. Test each eye separately – the 'bad' eye first. Position the patient, sitting or standing, at a distance of 6 metres from the chart.
How to Do an At-Home Eye Test Print or purchase a vision chart. Tape the chart on a wall. Place your child's chair ten feet away from the chart. Ask your child to cover one of his or her eyes. Light the vision chart. Have your child read each line of the chart. Repeat the process with your child's other eye covered.
How the Test is Performed. This test may be done in a health care provider's office, a school, workplace, or elsewhere. You will be asked to remove your glasses or contact lenses and stand or sit 20 feet (6 meters) from the eye chart. You will keep both eyes open.
How to Use the Eye Chart Print the free eye chart on regular 8 1/2 x 11-inch paper. Tack or tape the chart to a windowless wall in a well-lit room at eye level. Measure ten feet from the wall. Cover one eye (if you wear glasses for distance vision, keep them on)
If you have 20/40 vision, it means that when you stand 20 feet away from the chart you can only see what a normal human can see when standing 40 feet from the chart.