Optotype
Encyclopedia
An optotype is a standardized symbol for testing vision
. Optotypes can be specially shaped letters, numbers, or geometric symbols. For instance, to determine visual acuity
, optotypes of different sizes are presented to a person and the smallest size is determined at which the person can reliably identify the optotypes.
Visual perception
Visual perception is the ability to interpret information and surroundings from the effects of 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 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.