E chart
E Chart
The E Chart (pronounced "ee chart"), also known as the Snellen E Chart or Tumbling E Chart, is a type of eye chart used by optometrists and ophthalmologists to measure visual acuity. The chart consists of rows of the letter 'E' facing in different directions, which the patient is asked to identify.
Pronunciation
- E Chart: /ˈiː tʃɑːrt/
Etymology
The E Chart is named after its creator, Dutch ophthalmologist Herman Snellen, who developed it in the 1860s. The 'E' in E Chart stands for the letter 'E', which is the only letter used on this chart.
Usage
The E Chart is used in a similar way to the more common Snellen chart, but instead of reading letters of decreasing size, the patient is asked to identify the direction the 'E' is facing. This makes it useful for testing individuals who cannot read or speak English, or young children who may not yet know the alphabet.
Related Terms
- Visual Acuity: The sharpness of vision, usually measured with a Snellen chart or E Chart.
- Optometrist: A healthcare professional who provides primary vision care.
- Ophthalmologist: A medical doctor who specializes in eye and vision care.
- Snellen Chart: A type of eye chart used to measure visual acuity, consisting of lines of letters of decreasing size.
External links
- Medical encyclopedia article on E chart
- Wikipedia's article - E chart
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