visual acuity

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a measure of spatial resolution the measure of the abiltiy to visually discriminate
The clarity or clearness of the vision, a measure of how well a person sees The ability to distinguish details and shapes of objects; also called central vision It is measured on the familiar "Snellen's chart" with its decreasing size of letters
Sharpness of vision, especially as tested with a Snellen chart. Normal visual acuity based on the Snellen chart is 20/20
Measure of eye's ability to distinguish object details and shape Assessed by smallest identifiable object that can be seen at a specified distance, usually 20 feet for distance vision and 16 inches for near vision See Free Eye Tests
The ability to detect visual detail
  The ability to distinguish details and shapes of objects; also called central vision
A measure of the eyes ability to see
The sharpness of vision, the ability of the eye to distinguish detail
the relative ability of the visual system to resolve detail, usually expressed as the reciprocal of the minimum angular separation, in minutes of arc, of two lines just resolvable as separate and that forms in the average human eye an angle of one minute of arc; often measured by a "Snellen test," a test presenting letters of graduated sizes to determine the smallest size that can be read at a standard distance (a 20/20 letter located 20 feet away from an eye subtends an angle of 5 minutes of arc at the eye); "normal" acuity in the human eye is 20/20, although some eyes are capable of 20/15 or even 20/10 acuity
the clearness of vision; the ability to distinguish details and shapes
Measured ability to see
Clearness and sharpness of vision (p 112)
Visual acuity refers to the measure of the sharpness of vision
sharpness of vision; the visual ability to resolve fine detail (usually measured by a Snellen chart)
The ability to distinguish details and shapes of objects
A measure of the ability to distinguish fine details
Another phrase for visual clarity, it refers to how clearly a person can see Visual acuity is often measured with a traditional eye chart back to top
the measurement of vision corrected with spectacles or contact lenses
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A measure of the ability to resolve distinct objects or fine details with the eye
the space visible to an eye in a given position of gaze
The finest detail that an eye can distinguish using LogMar or Snellen scales
The ability to see clearly at a distance In Europe and the UK this is usually measure at 6 metres It is usually given as a fraction where the top number is the distance at which the test is performed The second figure is the level of vision It is usual to think of 6/6 as normal In the USA it is known as 20/20 because the distances are measured in feet instead of metres The larger the number on the bottom of the fraction the worse the vision Many people are able to see better than 6/6 and figures of 6/5 or even 6/4 are not uncommon
Clearness of vision The ability to distinguish details and shapes of objects; also called central vision
The ability to distinguish details and shapes of objects at varying distances
The smallest, fine detail you can see Usually measured with a letter chart But, can also be measured using pictures, black and white lines or visual evoked potentials (VEPs)
Ability of the eyes to see objects clearly and distinctly, usually measured on the Snellen eye chart (20/20)
visual acuity
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