A measure of human ability to perceive spatial variations in a scene It varies with the spatial frequency, shape, and contrast of the variations, and depends on whether the scene is coloured or monochrome
This is commonly measured with fractional numbers, i e 20/20, 20/30, etc , and is a measure of your ability to focus
(noun) The property of "sharpness" of the edge of letters and images formed by a matrix printing process The scalloping or deviation from straightness of the edge of letters caused by the construction of the letters or images by individual dots The higher the resolution, other factors being equal, the less the scalloping and the higher the acuity
a quick and penetrating intelligence; "he argued with great acuteness"; "I admired the keenness of his mind"
Clearness, as in visual acuity The most common measure of visual acuity is the Snellen acuity chart Normal acuity being 20/20 (6/6 metric version)
The sharpness or keenness of sensory perception, as in sharp vision and keen hearing
The clarity or distinctness with which we view our world It is commonly measured by looking at charts of letters or pictures Good, average acuity is considered 20/20, meaning at 20 feet, a letter that is 20 mm can be seen clearly, though it is possible to have acuities better than this measurement
Measure of an eye's ability to distinguish object details and shape Usually specified by the smallest identifiable object that can be seen at 20 ft for distance vision and 16 in for near vision
Clearness as in visual acuity The most common measure of visual acuity is the Snellen Acuity- completely normal acuity being 20/20 or 6/6 (metric version)
Sight; the ability of the eye to resolve fine detail This is usually reported in the Snellen notation, with 20/20 being the normal value Twenty feet is the test distance, and the lower number refers to a reference for a person with normal sight
Acuity is sharpness of vision or hearing, or quickness of thought. We work on improving visual acuity. the ability to think, see, or hear clearly (acuité, from , from agu , from acutus; ACUTE)
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
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 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)
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
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