visual angle


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Related to visual angle: visual acuity

visual angle

[′vizh·ə·wəl ‚aŋ·gəl]
(optics)
The angle which an object subtends at the nodal point of the eye of an observer.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

visual angle

The angle which an object or detail subtends at the point of observation; usually measured in minutes of arc.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
References in periodicals archive ?
5.0, 10.0, and 16.0 cpd of visual angle and an average luminance of 34.4 cd/[m.sup.2] were used.
Zhou, "An extended visual angle model for car-following theory," Nonlinear Dynamics, vol.
Compared to more conventional approaches that use either a concave mirror or a convex lens to increase the visual angle of a holographic 3D image, this new approach can achieve a higher degree of freedom of display size and visual angle.
In this case, a clear trend in the Task effect, F(1, 23) = 4.03, p = .057, [[eta].sup.2.sub.p] = .15 was found, with increased amplitudes for expression than for gender (M = 2.89 and M = 2.46 visual angle degrees -v.a.d.-, respectively).
At the top, from left to right, spatial frequencies of 0.6 and 2.5 cpd (cycle per degree of visual angle).
At the viewing distance of 100 cm, the check edges subtend a visual angle of 15 minutes with video monitor screen subtending an angle of 12.5[degrees].
The appearance detector depends on the shape information, because the image intensity is varying along the observation distance, and the shape is more robust feature which is affected by visual angle and acquired easily.
The physical curve parameters of maximum height (H) and width (W), given in centimetres here in Table 1, translate into degrees of visual angle (Deg V), which reflects the size of a given parameter as it is perceived by the human eye as a function of the distance of the observer from the object viewed, using the linear transform,
They calculated that given the distance between an eye and the center of the display (750 mm) and the consequent visual angle, the text font needed to be 5.3-mm tall, and while there is an ISO standard calling for a line spacing of 0.7x text height, they determined that a 1.2x text height was more efficient.
The quiet eye is operationally defined as the final fixation or tracking gaze located on a specific location or object in the visual-motor workspace within 3[degrees] of visual angle for a minimum of 100 ms.

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