E CHART Meaning and
Definition
-
E chart refers to a type of eye chart used by optometrists and ophthalmologists to assess a person's visual acuity or sharpness of vision. It is also known as the "Snellen chart" or the "letter chart."
The E chart typically consists of multiple rows of capital letter E's, positioned in different orientations. The letters decrease in size from top to bottom, with the largest letter at the top. The person being tested is asked to identify the direction in which the arms of the letter E are pointing - up, down, left, or right. This allows the examiner to determine the individual's ability to see letters of different sizes and orientations clearly.
The E chart is designed based on the Snellen fraction, which measures visual acuity. The visual acuity is expressed as a ratio, with the distance at which the test is conducted as the numerator and the distance at which a person with normal vision can read the line as the denominator. For instance, if a person can read the line meant for individuals with normal vision at 20 feet, but the test is conducted at 10 feet, their visual acuity is recorded as 20/40.
The E chart is a widely used tool in optometry clinics to determine the need for corrective lenses or to assess the effectiveness of current prescription eyeglasses or contact lenses. It is a simple and efficient method to evaluate a person's visual acuity and detect any vision problems or conditions that might require further examination or treatment.
Common Misspellings for E CHART
- echart
- e chard
- w chart
- s chart
- d chart
- r chart
- 4 chart
- 3 chart
- e xhart
- e vhart
- e fhart
- e dhart
- e cgart
- e cbart
- e cnart
- e cjart
- e cuart
- e cyart
- e chzrt
- e chsrt
Etymology of E CHART
The term "E chart" is used to refer to a specific type of eye chart used for testing visual acuity. The etymology of this term can be traced back to the optometrist, Dr. Hermann Snellen, who developed the Snellen chart in 1862. The Snellen chart consists of letters arranged in decreasing size, with the largest letters at the top. The E chart is a variation of the Snellen chart, where all the letters are the uppercase letter "E" oriented in different directions.
The term "E chart" simply derives from the fact that the chart predominantly consists of the letter "E". It is an abbreviation for "eye chart" specific to this particular design. The E chart and the Snellen chart are widely used by optometrists and ophthalmologists around the world to assess a person's visual acuity.
Infographic
Add the infographic to your website:
