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

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 ?
patient should do Premenstrual new clinical and lab migraine evaluation Vestibular No treatment Waiting for new rehabilitation evaluation +++: severe; ++: moderate; +: mild; DVA: dynamic visual acuity; VNG: videonystagmography; DHI: Dizziness Handicap Inventory.
Static Visual Acuity (%) Dynamic Visual Acuity (%) Age (yr) Lea HOTV Lea HOTV 3 81 76 70 40 4 94 86 85 50 Table 3.
The relationship of dynamic visual acuity to skill on a tennis related task.
The effects of target borders on dynamic visual acuity: Practical and theoretical implications.
Dynamic Visual acuity: Normative functions and practical implications.
The regression models in this study showed that a combination of central motion sensitivity, UFOV scores, Pelli-Robson letter contrast sensitivity, and dynamic visual acuity could predict 50% of the variance in overall driving score.
The nature and basis of age-related changes in dynamic visual acuity. Psychology and Aging, 5, 138-143.
A preliminary study of dynamic visual acuity and its effects on motorists' vision.
A new dynamic visual acuity device: Aging and sex difference in dynamic visual acuity.
The effect of target contrast variation on dynamic visual acuity and eye movements.
A review of dynamic visual acuity. NAMRL Monograph-28.
Dynamic visual acuity. Following the determination of static acuity, the participant's dynamic acuity for Landolt-C targets presented at the two target velocities of 60 [degrees] and 120 [degrees]/s was measured.

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