An E chart, also known as a tumbling E chart, is an eye chart used to measure a patient's visual acuity.

Uses

This chart does not depend on a patient's easy familiarity with a particular writing system (such as the

Latin alphabet The Latin alphabet, also known as the Roman alphabet, is the collection of letters originally used by the Ancient Rome, ancient Romans to write the Latin language. Largely unaltered except several letters splitting—i.e. from , and from � ...

). This is often desirable, for instance with very young children. This also allows use with patients not readily fluent in the alphabetfor example, in China. The chart contains rows of the letter "E" in various kinds of rotation. The patient is asked to state (usually by pointing) where the limbs of the E are pointing, "up, down, left or right." Depending on how far the patient can "read", their

visual acuity Visual acuity (VA) commonly refers to the clarity of visual perception, vision, but technically rates an animal's ability to recognize small details with precision. Visual acuity depends on optical and neural factors. Optical factors of the eye ...

is quantified. It works on the same principle as Snellen's distant vision chart.

References

* Charts Diagnostic ophthalmology Medical tests Optotypes {{ophthalmology-stub

Uses

See also

References