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Visual angle is the angle a viewed object subtends at the eye, usually stated in degrees of arc. It also is called the object's angular size.
So to find the angle, we just use the inverse tan function (also knows as atan) – θ = atan (Opposite / Adjacent) or θ = atan (Size / Distance). So armed with this knowledge, we can easily compute visual angle simply by measuring the distance (Adjacent) and size (Opposite) of any object being viewed.
Calculation of Visual Angle. Draw the principle rays from the ends of the inverted arrow bc through the nodal point n and extend these principle rays to the retina. Two similar triangles are formed. The first D bcn has exactly the same angles as D b'c'n.
The angle between the two lines projecting from the eye to the top and bottom of the cat is the visual angle. The calculated visual angle is shown in degrees (and fractional degrees) and in degrees, minutes and seconds of visual arc.
The visual angle is the angle formed from two imaginary lines projecting from the eye. One goes to the top (or left) of the object and the other goes to the bottom (or right) of the object. Visual angle is usually reported in degrees, minutes and seconds of the subtended angle.
Angular diameter. The angular diameter, angular size, apparent diameter, or apparent size is an angular distance describing how large a sphere or circle appears from a given point of view. In the vision sciences, it is called the visual angle, and in optics, it is the angular aperture (of a lens).
Online Visual Angle Calculator - enter screen resolution, dimensions and distance, then convert pixels to degrees of visual angle and vice versa.
