A line or surface containing all those points in space whose images fall on corresponding points of the retinas of the two eyes.
- 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'.
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