| visual acuity n. Sharpness of vision, especially as tested with a Snellen chart. Normal visual acuity based on the Snellen chart is 20/20. |
Visual acuity
The ability to distinguish details and shapes of objects.
visual acuity
Etymology: L, visus, vision, acuitas, sharpness
1 a measure of the resolving power of the eye, particularly with its ability to distinguish letters and numbers at a given distance.
2 the sharpness or clearness of vision.
acuity [ah-ku´ĭ-te]
1. Acuteness (see acute [def. 2]); the level of severity of an illness. This is one of the parameters considered in patient classification systems that are designed to serve as guidelines for allocation of nursing staff, to justify staffing decisions, and to aid in long-range projection of staffing and budget.
2. clearness of the visual perception of an image.
visual acuity the ability to discriminate visually between forms.
Visual field chart illustrating the divisions of the visual field related to visual acuity. (Courtesy of Josephine C. Moore, PhD, OTR.) From Pedretti and Early, 2001.
acuity (
kyōōitē),n sharpness; clearness; keenness.
acuity, auditory,
n the sensitivity of the auditory apparatus; sharpness of hearing. The ability to hear a given tone with respect to the degree of intensity required to produce a sensation that is just perceptible.
acuity, visual,
n sharpness, acuteness, clearness of vision. Visual acuity may be defective because of optical or neurologic dysfunction.
agnosia
Inability to recognize the import of sensory stimuli (e.g. to recognize colour, faces, shape and the orientation of objects), although the receptors and the sensory pathway are intact. The condition is attributed to bilateral lesions in the association areas of the cortex. If the sense of sight is affected, it is called visual agnosia (perceptual or psychic blindness). See alexia; optical apraxia; prosopagnosia.
agraphia
Inability to write, usually as a result of a brain lesion. If the person can write from dictation but not from copying, it is called visual agraphia.
visual acuity
Central vision Ophthalmology The ability to distinguish details and shapes of objects; a measure of the ability to resolve distinct objects or fine details with the eye
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