Snellen Eye Chart

Buy a Snellen Eye Chart and test your visual acuity! A Snellen chart is an eye chart used by eye care professionals and others to measure how well you see at various distances. Snellen Eye Charts are named after the Dutch ophthalmologist Hermann Snellen who developed the chart in 1862. In the most familiar acuity test, a Snellen chart is placed at a standard distance, twenty feet in countries where that is the customary unit of measure.

The traditional Snellen Eye Chart is printed with eleven lines of block letters. The first line consists of one very large letter, an E. Subsequent rows have increasing numbers of letters that decrease in size. A patient taking the test covers one eye, and reads aloud the letters of each row, beginning at the top. The smallest row that can be read accurately indicates the patient's visual acuity in that eye.

Wall-mounted Snellen Eye Charts are inexpensive and are sometimes used for rough assessment of vision, e.g. in a primary-care physician's office. Whenever acuity must be assessed carefully (as in an eye doctor's examination), or where there is a possibility that the examinee might attempt to deceive the examiner (as in a motor vehicle license office), equipment is used that can present the letters in a variety of randomized patterns.

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