| 释义 |
visual acuity
visual acuityn. Sharpness of vision, especially as tested with a Snellen chart. Normal visual acuity based on the Snellen chart is 20/20.vis′ual acu′ity
n.. acuteness of the vision as determined by a comparison with the normal ability to identify certain letters at a given distance, usu. 20 ft. (6 m). [1885–90] Thesaurus| Noun | 1. |  visual acuity - sharpness of vision; the visual ability to resolve fine detail (usually measured by a Snellen chart)acuity, sharp-sightednessvisual modality, visual sense, vision, sight - the ability to see; the visual faculty20/20, twenty-twenty - normal visual acuity, as measured by the ability to read charts at a distance of 20 feetoxyopia - unusually acute vision |
Translationsvisual acuity
visual acuity[′vizh·ə·wəl ə′kyü·əd·ē] (physiology) The ability to see fine details of an object; specifically, the ability to see an object whose angle subtended at the eye is 1 minute of arc. visual acuityA measure of the ability to distinguish fine details; the reciprocal of the angular size of critical detail which is just large enough to be seen.visual acuity
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·tydetection 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 acuityvisual acuityn. 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 eyevis·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 acuityThe ability to distinguish details and shapes of objects.Mentioned in: Amblyopia, Myopia, Presbyopiaagnosia 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. See V
See VAvisual acuity
Synonyms for visual acuitynoun sharpness of visionSynonymsRelated Words- visual modality
- visual sense
- vision
- sight
- 20/20
- twenty-twenty
- oxyopia
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