CARTA SNELLEN PDF

Hermann Snellen developed the eye chart in What Is a Snellen Eye Chart? The Snellen eye chart is the familiar, classic chart of big and little letters. The 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 to bottom. The size of the letters progressively decreases, allowing for more letters on each subsequent line.

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Hermann Snellen developed the eye chart in What Is a Snellen Eye Chart? The Snellen eye chart is the familiar, classic chart of big and little letters. The 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 to bottom. The size of the letters progressively decreases, allowing for more letters on each subsequent line. Visual Acuity Testing When testing for visual acuity, the patient covers one eye and reads 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 test is repeated with the other eye, and then with both eyes together. Visual Acuity Testing Results The results of your acuity exam chart reading will determine 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. To interpret your reading, think of the numbers in feet. Modern optometric exam rooms are equipped with electronic eye reading charts, making it easier to produce accurate readings. What You Should Know There are several versions of this chart for people, such as young children, who cannot read the letters of the alphabet.

Some of these special charts have pictures to identify in lieu of alphabet letters or numbers. The best way to determine your true visual acuity is to have an eye examination performed by a professional. Was this page helpful? Thanks for your feedback! Sign up for our Health Tip of the Day newsletter, and receive daily tips that will help you live your healthiest life.

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The experimental charts developed in used abstract symbols. The first line consists of one very large letter, which may be one of several letters, for example E, H, or N. Subsequent rows have increasing numbers of letters that decrease in size. A person taking the test covers one eye from 6 metres or 20 feet away, and reads aloud the letters of each row, beginning at the top.

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Snellen chart

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