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.

Noun

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