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Optotype

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Optotype

An optotype is a standardized symbol for testing vision

Visual perception

Visual perception is the ability to interpret information from visible light reaching the eye. The resulting perception is also known as eyesight, sight or vision....
. Optotypes can be specially shaped letters, numbers, or geometric symbols. For instance, to determine visual acuity

Visual acuity

Visual acuity is acuteness or clearness of visual perception, especially form vision, which is dependent on the sharpness of the retinal focus within the eye and the sensitivity of the interpretative faculty of the brain....
, optotypes of different sizes are presented to a person and the smallest size is determined at which the person can reliably identify the optotypes.

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Encyclopedia

An optotype is a standardized symbol for testing vision

Visual perception

Visual perception is the ability to interpret information from visible light reaching the eye. The resulting perception is also known as eyesight, sight or vision....
. Optotypes can be specially shaped letters, numbers, or geometric symbols. For instance, to determine visual acuity

Visual acuity

Visual acuity is acuteness or clearness of visual perception, especially form vision, which is dependent on the sharpness of the retinal focus within the eye and the sensitivity of the interpretative faculty of the brain....
, optotypes of different sizes are presented to a person and the smallest size is determined at which the person can reliably identify the optotypes.

See also

Landolt C
Landolt C

A Landolt C, also known as a Landolt ring or Landolt broken ring, is an optotype, i.e. a standardized symbol used for testing vision....
Lea test
Lea test

A Lea test is a visual acuity test tailored for children who do not know the alphabet normally used in eye charts. The optotypes are outlines of an apple, a house, a Square , and a circle....
Snellen chart
Snellen chart

A Snellen chart is an eye chart used by eye care professionals and others to measure visual acuity. Snellen charts are named after the Dutch ophthalmologist Herman Snellen who developed the chart in 1862....
Hanks paediatric eye charts
Hanks paediatric eye charts

The Hanks Paediatric Test Cards were developed by an optometrist, Dr Anthony Hanks, and are designed for use when evaluating the vision of young children....