Binocular Vision and Stereopsis (Oxford Psychology Series) by Ian P. Howard

By Ian P. Howard

This publication is a survey of data approximately binocular imaginative and prescient, with an emphasis on its position within the notion of a three-d international. the first curiosity is organic imaginative and prescient. In every one bankruptcy, physiological, behavioral, and computational techniques are reviewed in a few element, mentioned, and interrelated. The authors describe experiments required to respond to particular questions and relates them to new terminologies and present theoretical schemes.

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Extra info for Binocular Vision and Stereopsis (Oxford Psychology Series)

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This lens is not essential, and fusion of any of the stereograms in this book is facilitated by simply holding a card about 20 cm long between the eyes so that each eye sees only its own half image. To fuse the images without prisms, the eyes must diverge beyond the plane of the stereogram but most people have no difficulty doing this since the partition between the eyes removes the tendency to remain converged in the plane of the stereogram. 13. The optical features of various types of stereoscopes.

The binocular field of fixation is the area within which binocular fixation is possible by moving the eyes but not the head (see Sheni and Remole 1986). THE HOROPTER A monocular stimulus is one seen by only one eye, because it falls outside the binocular field or on the blind spot of the other eye or because one eye is closed. Stimuli falling in the binocular field and visible to both eyes are binocular stimuli. 1 explained that there are two types of binocular stimuli, dioptic and dichoptic. A dioptic stimulus is a single visual object seen in essentially the same way by the two eyes, although the images in the two eyes may differ in shape or position because the eyes are not converged on the object or because the optical properties of the eyes differ, as in aniseikonia.

Animals with a binocular field suffer diplopia when the mechanisms responsible for conjunctive and disjunctive eye movements are damaged, as in strabismus. Animals with laterally placed eyes, which have only a small binocular field, are less affected by diplopia. They no doubt experience a unified panoramic visual field, which may extend 360'. We humans experience a unified visual field when the nasal half of each eye's visual field is occluded. A simple way to demonstrate this is to hold up against the nose an occluder just wide enough to make the nasal limit of vision for one eye coincide with the nasal limit for the other eye.

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