visual acuity

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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.

res·o·lu·tion a·cu·i·ty

detection of a target having two or more parts, often measured by using the Snellen test types; indicated by two numbers: the first represents the distance at which a patient sees the test types (usually 6 m. or 20 ft.), and the second, the distance at which the test types subtend an angle of 5 min.; for example, vision of 6/9 indicates a test distance of 6 m. and recognition of symbols that subtend an angle of 5 min. at a distance of 9 m.
Synonym(s): visual acuity

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

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.

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

vis·u·al a·cu·ity

(vizh'ū-ăl ă-kyū'i-tē)
Sharpness or clarity of vision, measured as the ability to distinguish letters or other images of various sizes at a fixed distance, usually with a Snellen chart. Normal rating by such means is 20/20 vision.

visual acuity

The extent to which an eye is capable of resolving fine detail. Visual acuity is measured by means of a SNELLEN'S CHART TEST.

Visual acuity

The ability to distinguish details and shapes of objects.
Mentioned in: Amblyopia, Myopia, Presbyopia

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.

vis·u·al a·cu·ity

(vizh'ū-ăl ă-kyū'i-tē)
Sharpness or clarity of vision, measured as the ability to distinguish letters or other images of various sizes at a fixed distance, usually with a Snellen chart. Normal rating by such means is 20/20 vision.
References in periodicals archive ?
Dynamic visual acuity while walking in normals and labyrinthine-deficient patients.
Categories Investigated and their Corresponding Variables Areas of Evaluation Factors Investigation Pressure 2 free field or interior overpressure measurements 28 breacher overpressure measurements 2 gauges in the helmet, 2 gauges on the vest Head Yaw Orientation Pitch Roll Air Sampling Lead Copper Auditory Immittance Acoustic reflexes Thresholds Distortion product otoacoustic emissions Vestibular Dynamic visual acuity test Limits of stability Modified clinical test of sensory integration on balance Table 2.
Vizuo XL Sports Vision Enhancement(TM) is marketed as a dietary supplement that improves sports vision, which consists of visual skills such as dynamic visual acuity, depth perception, peripheral vision, eye-hand coordination, visual memory, and several others that are important if athletes want to be successful.

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