visual angle


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Related to visual angle: visual acuity

angle

 [ang´g'l]
the space or figure formed by two diverging lines, measured as the number of degrees one would have to be moved to coincide with the other.
acromial angle that between the head of the humerus and the clavicle.
alpha angle that formed by intersection of the visual axis with the optic axis.
buccal a's
1. the tooth angles between the buccal surface and the other surfaces of a posterior tooth; see accompanying illustration.
2. the cavity angles between the buccal wall of a tooth cavity and other walls.
cardiodiaphragmatic angle that formed by the junction of the shadows of the heart and diaphragm in posteroanterior radiographs of the heart.
cavity a's the angles formed by the junction of two or more walls of a tooth cavity, named according to the walls participating in their formation.
cavosurface angle the angle formed by the junction of a wall of a tooth cavity preparation and a surface of the crown of the tooth.
costovertebral angle the angle formed on either side of the vertebral column between the last rib and the lumbar vertebrae.
distal a's
1. the tooth angles formed between the distal surface and the other surfaces of a tooth; see accompanying illustration.
2. the cavity angles between the distal wall of a tooth cavity and other walls.
filtration angle (angle of the iris) the angle between the iris and cornea at the periphery of the anterior chamber of the eye, through which the aqueous humor readily permeates.
angle of jaw the junction of the lower edge with the posterior edge of the lower jaw.
lingual a's
1. the tooth angles formed between the lingual surface and the other surfaces of a tooth; see accompanying illustration.
2. the cavity angles between the lingual wall of a tooth cavity preparation and other walls.
angle of Louis an anatomical landmark located on the sternum; it can be felt as a notch or ridge at the top of the sternum.
mesial a's
1. the tooth angles formed between the mesial surface and other surfaces of a tooth; see accompanying illustration.
2. the cavity angles between the mesial wall of a tooth cavity and other walls.
meter angle the angle formed by intersection of the visual axis and the perpendicular bisector of the line joining the centers of rotation of the two eyes when viewing a point one meter distant (small meter angle) or the angle formed by intersection of the visual axes of the two eyes in the midline at a distance of one meter (large meter angle).
optic angle visual angle.
angle of pubis that between the pubic bones at the symphysis.
sternoclavicular angle that between the sternum and the clavicle.
tooth a's the angles formed by the junction of two or more surfaces of a tooth, named according to the surfaces participating in their formation
Tooth angles: Top, line angles; Bottom, point angles. From Dorland's, 2000.
(see accompanying illustration).
visual angle the angle between two lines passing from the edges of an object seen, through the nodal point of the eye, to the corresponding edges of the image of the object seen.

vis·u·al an·gle

the angle formed at the retina by the meeting of lines drawn from the periphery of the object seen.

vis·u·al an·gle

(vizh'ū-ăl ang'gĕl)
The angle formed at the retina by the meeting of lines drawn from the periphery of the object seen.
References in periodicals archive ?
After plugging the numbers into Excel (see the table on the opposite page), I found that when positioned at the very beginning of the approach, the runway shape will subtend a visual angle of 2.5 degrees on the back of the eye.
Compute the boundary moment [I.sup.B](m) of the mth target shape model [C.sup.]B(m) offline noted as the set (t, v, k, l, p, q, [I.sup.B]), where (t, v) is the sample identifier, t is the target type, v is the visual angle, the number of contour sampling points p is k, the number of predefined interest points q is l, and [I.sup.B] is the boundary moment descriptor.
Consequently, the last fixation prior to the registration of the light barriers with a length of a minimum of 100ms within a visual angle of 3[degrees] (88 pixels) defined the quiet eye period in milliseconds.
Since 5 lags and 4 visual angles were manipulated, there were 20 cells in the design.
Selective attention of global and local information: Effects of visual angle, exposure duration and eccentricity on processing dominance.
Nine-year incidence of vision loss (doubling of the visual angle)a by age and sex and estimated average annual incidence in individuals of African descent, Barbados, 1992-2003 Male No.
We call the appearance visual angle. Note that visual angle in this paper is not the angle a viewed object subtends at the eye which is called the object's angular size.
Measures of perceived linear size, sagittal motion, and visual angle from optical expansions and contractions.
"I simply offer a different visual angle on to the square," Benini said from his Milan office.
As early as the 17th century, Dutch astronomer Christiaan Huygens recalled the sky's illusions when describing that things overhead seem "to be no farther away than the clouds that float above our heads." He added, "So now when two bodies of equal magnitude cover the same visual angle, we always judge as larger the one taken to be farther away."
When the spider arrived at the end of the path, it was placed into a transparent open glass container and transferred to the center of an arena 90 cm in diameter (wall height, 48 cm; visual angle, 47[degrees]) (Fig.
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].

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