Horopter

Horopter

Horopter (pronunciation: /hɔːˈrɒptər/) is a term used in visual perception and optometry to describe the locus of points in space that, when fixated, fall on corresponding points on the two retinas.

Etymology

The term 'Horopter' is derived from the Greek words 'ὅρος' (horos, meaning 'boundary' or 'limit') and 'ὀπτερός' (opteros, meaning 'seeing').

Related Terms

• Binocular vision: The ability to maintain visual focus on an object with both eyes, creating a single visual image. Lack of binocular vision is normal in prey animals and abnormal in predators, who need the depth perception binocular vision provides to hunt.
• Disparity: The difference in image location of an object seen by the left and right eyes, resulting from the eyes’ horizontal separation (parallax). The brain uses binocular disparity to extract depth information from the two-dimensional retinal images in stereopsis.
• Panum's fusional area: An area in space, surrounding the horopter, where single vision can still be maintained, despite small disparities between the images on the two retinas.
• Stereopsis: The perception of depth and 3-dimensional structure obtained on the basis of visual information deriving from two eyes by individuals with normally developed binocular vision.

See Also

• Visual perception
• Optometry
• Binocular vision
• Disparity
• Panum's fusional area
• Stereopsis

External links

• Medical encyclopedia article on Horopter
• Wikipedia's article - Horopter

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