HOROPTER

, in Optics, is a right line drawn through the point where the two optic axes meet, parallel to that which joins the centres of the two eyes, or the two pupils. As the line AB drawn through C the point of concourse of the optic axes of the eyes, and parallel to HI joining the centres of the eyes.— This line is called the Horopter, because it is found to be the limit of distinct vision. It has several properties in Optics, which are described at large in Aguillonius, Opt. lib. 2, diss. 10.

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Entry taken from A Mathematical and Philosophical Dictionary, by Charles Hutton, 1796.

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