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The two non-repeating lines can be used to verify correct wall-eyed viewing. When the autostereogram is correctly interpreted by the brain using wall-eyed viewing, and one stares at the dolphin in the middle of the visual field, the brain should see two sets of flickering lines, as a result of binocular rivalry. [11]
The Ponzo illusion is a geometrical-optical illusion that makes horizontal lines appear longer when they are placed between converging lines. Learn about the history, explanations, and variations of this illusion, and how it relates to vision, perception, and action.
A vanishing point is a point on the image plane of a perspective rendering where parallel lines in space appear to converge. Learn about the history, geometry, and applications of vanishing points in art, photography, and computer graphics.
Convergence is a binocular oculomotor cue for distance and depth perception. Because of stereopsis, the two eyeballs focus on the same object; in doing so they converge. The convergence will stretch the extraocular muscles – the receptors for this are muscle spindles. As happens with the monocular accommodation cue, kinesthetic sensations ...
Stereoscopy is a technique for creating or enhancing the illusion of depth in an image by means of stereopsis for binocular vision. Learn about the history of stereoscopy, the different methods of displaying stereograms, and the uses of stereoscopy in various fields.
A probability problem about a needle dropped on a floor with parallel lines. Learn the solution, the connection to π, and the history of this classic geometric problem.
Vergence is the angle formed by rays of light that are not perfectly parallel to one another. It is related to the optical power, focal length, and spot size of optical systems, and has different definitions and applications in geometrical and Gaussian optics.
The Maddox rod test is a subjective method to measure horizontal and vertical deviations of the eyes, using a red line and a white light. The double Maddox rod test can also assess torsion and cyclotropias, by comparing the angles of two red lines.