visual angle

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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 ?
Stimuli were presented in Arial font and subtended 1[degrees] of visual angle at a viewing distance of approximately 57 cm.
Selective attention of global and local information: Effects of visual angle, exposure duration and eccentricity on processing dominance.
Three Visual Angles of Three Dimensional Orthogonal Axes and Their Visualization.
The size of the central field omission was either 10[degrees]x 10[degrees], 20[degrees] x 20[degrees], 30[degrees] x 30[degrees], or 40[degrees] x 34[degrees] of visual angle. Figure 3 illustrates a 20o x 20o omission of the central visual field and the maximum roll position at 15[degrees].
One of these stated that visual angle comprised between stimuli and observer's eyes is the source of these differences, since frontoparallel distances presented larger visual angles than depth distances (Levin & Haber, 1993).
The software provides color readings of parts over a wider range of visual angles than with current measurement methods.
exotica stays roughly the same, density and contours of individual ommatidia are kept constant, and both interommatidial and visual angles persist unchanged throughout an individual's life; hence the resolving power of the eye should also remain rather stable, even if the FFF were to rise as the animal grows and becomes faster.
This is Apple's professional-level program for creating DVDs with all of the bells and whistles found on commercial DVDs (chapters, motion menus, subtitles, multiple languages, visual angles, etc ...) While DVD Studio Pro has a steeper learning curve than iDVD, it is within reach of committed educators.
Columns define the dining room from the entry and allow interesting light and visual angles to entertain guests.
If a mainstream journal of visual psychophysics is opened, for example, it will be found that the measurement scales in use are visual angles (arcmin), luminances (cd/[m.sup.2]), contrast (a ratio scale) and time.
The authors' conclusions can be interpreted in several ways: (a) observers' judgments match the distal stimulus more closely than the proximal stimulus, as in size constancy (the distance between two targets can be considered as the size or width of an aperture; see Gibson & Bergman, 1954; Warren & Whang, 1987); this has been shown to depend on the availability of distance cues (Holway & Boring, 1941); (b) distance estimates are not based on the specific visual angles that the authors measured but are based on other properties of the optic array that provide information about distance, but such properties were not described by the authors; (c) distance estimates are not based on visual angles or optical information generally but are based on extraretinal information.

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