Definition of horopter in English:

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Pronunciation: /ˈhôˌräptər/ Pronunciation: /həˈräptər/


A line or surface containing all those points in space whose images fall on corresponding points of the retinas of the two eyes.
Example sentences
  • All the points common to both the horizontal and vertical line horopters have the same direction in each eye.
  • The difference you notice in your ability to read the brochure is caused by the vertical horopter.
  • The experimentally determined horopter deviates from the Vieth-Muller circle and is closer to the objective frontal plane passing through the fixation point.


Early 18th century: from Greek horos 'limit' + optēr 'person who looks'.

For editors and proofreaders

Syllabification: ho·rop·ter

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