Definition: The sum of the points in space, the images of which for a given fixation point fall on corresponding retinal points. If the fixation point is 2 m., the horopter is a straight line; if less, a curve concave to the face; if more, a convex curve.
[G. horos, limit, + opter, spy, scout, fr. orao, fut. opsomai, to see]
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