What Are the Different Types of Eye Charts?

What Are the Different Types of Eye Charts?

What Are the Different Types of Eye Charts?

The different types of eye charts include the Snellen chart, the Landolt C chart, the logMAR chart and the Jaeger chart. The Tumbling E chart is a modification of the Snellen chart for the very young or the illiterate who do not recognize the letters of the alphabet.

Ophthalmologists measure a patient's visual acuity by having the patient identify the test symbols on an eye chart. If a patient recognizes test symbols accurately at a distance of 20 feet, the patient has normal visual acuity, which is also known as 20/20 vision.

Eye charts are only one part of a complete eye exam and do not measure peripheral vision, depth perception, eye fluid pressure or the dryness of the eyes. Thus, doctors only use them to figure out whether a patient needs glasses or contact lenses to correct any vision problems.