eye chart

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eye chart

The optometrist asks the patient to read the letters on the eye chart.

Definition

Noun: A eye chart is a standardized chart displaying letters, numbers, or symbols in rows of decreasing size. It is designed to be read from a specified, fixed distance and is used by eye care professionals to measure visual acuity, or the clarity and sharpness of a person's vision.

Usage

The term eye chart is used specifically in the context of medical and optometric examinations to assess eyesight. It refers to the physical chart itself. - The most common type is the Snellen chart, which often features a large 'E' at the top. - During an exam, a person covers one eye and reads the letters on the eye chart from a set distance, typically 20 feet (6 meters) in the US or 6 meters elsewhere.

Examples
  • The optometrist asked the patient to read the smallest line they could see on the eye chart.
  • A standard eye chart was mounted on the wall at the end of the examination room.
  • Failing to read the middle lines of the eye chart may indicate a need for glasses or a new prescription.
Advanced Usage
  • "To read the eye chart": This phrase describes the action of undergoing a vision test.
    • During my driver's license renewal, I had to read the eye chart.
  • The concept is sometimes used metaphorically to describe a test of basic perception or understanding.
    • The dense legal document was an eye chart for anyone without a law degree.
Variants and Related Words
  • Snellen chart (n): The most prevalent type of eye chart, named after its inventor, Dutch ophthalmologist Herman Snellen.
  • LogMAR chart (n): A more modern, scientifically precise type of eye chart used in clinical research.
  • Visual acuity chart (n): A more formal or technical term for an eye chart.
  • Tumbling E chart (n): A specific eye chart used for children or illiterate individuals, where the letter 'E' is rotated in different directions.
Synonyms
  • Vision chart
  • Sight chart
  • Acuity chart
Related Idioms and Phrases
  • "Pass the eye chart test": To succeed in a basic assessment of one's ability to see or, figuratively, to understand something fundamental.
    • The new software interface is so intuitive that anyone can pass the eye chart test.
  • "Like trying to read an eye chart from across the room": A simile describing something that is blurry, indistinct, or very difficult to make out.
    • Without my glasses, the street signs are like trying to read an eye chart from across the room.
eye chart

The optometrist asks the patient to read the letters on the eye chart.

Noun
  1. a chart that is read from a fixed distance; used as a test of vision