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Encyclopedia > Visual angle

The visual angle is the angle under which a visual stimulus appears to the eye. Simply speaking, it is the angle between the light rays from the two ends of the viewed object as they hit the eye. It is usually measured in degrees or minutes of arc. This article is about angles in geometry. ... The term stimulus (plural: stimuli) has several related meanings: In physiology, a stimulus is something external that elicits or influences a physiological or psychological activity or response. ... An eye is an organ that detects light. ... A degree (in full, a degree of arc), usually symbolized °, is a measurement of plane angle, representing 1/360 of a full rotation. ... A minute of arc, arcminute, or MOA is a unit of angular measurement, equal to one sixtieth (1/60) of one degree. ...


If one looks at a one-centimeter object at a distance of one meter and a two-centimeter object at a distance of two meters, both have the same size on the retina. Therefore, in many cases it does not make sense to refer to the absolute size of a visual stimulus, if one is interested in the performace of the eye or the first processing steps in the visual cortex. What matters is the visual angle. Human eye cross-sectional view. ... The term stimulus (plural: stimuli) has several related meanings: In physiology, a stimulus is something external that elicits or influences a physiological or psychological activity or response. ... An eye is an organ that detects light. ... The visual cortex is the general term applied to both the primary visual cortex (also known as V1) and the visual association area (V2, V3, V4, V5). ...


See also

Visual acuity is the eyes ability to detect fine details and is the quantitative measure of the eyes ability to see an in-focus image at a certain distance. ...

External links

Calculation of the visual angle


  Results from FactBites:
 
Highbeam Encyclopedia - Search Results for visual (1001 words)
The primary visual cortex, occupying the gyri on both sides of the deep calcarine sulcus in the occipital cortex, is known...
In humans, the visual field of each eye subtends a visual angle of about 170 degrees in the horizontal plane and there is almost complete overlap between the visual fields of the two eyes.
The part of the visual cortex to which the photoreceptors in the retinas of the eyes are eventually projected, occupying the gyri on both sides of the deep calcarine sulcus in the occipital cortex, containing 200 million cells within a total area of 25 square centimetres...
Highbeam Encyclopedia - Search Results for Angles (721 words)
The angle subtended at the nodal point of the eye's crystalline lens by a visual stimulus, determined jointly by the size of the stimulus and its distance from the observer.
The visual angle subtended by the moon in the night sky is almost exactly one-half of a degree or 30 minutes...
A model of the effect of strand angle and grain angle on the strength properties of oriented veneer and strand wood composites.
  More results at FactBites »

 
 

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