dioptry

plural dioptries

1. alternativeobsoleteAlternative form of diopter.

   They also shared a fearful myopia of identical dioptry, were apt to bump into inanimate objects, sit down on invisible chairs, or bounce off each other as they shambled about talking and gesticulating.

   1974, Lawrence Durrell, “Macabru”, in Monsieur, New York: Viking, published 1975, page 176

   1 more example

   The Dioptral System of numbering prisms alone possesses the great desideratum of establishing a direct and simple relation between the prism-dioptry and the lens-dioptry, as demonstrated by the authors' law, that "a lens decentered one centimeter will produce as many prism-dioptry as the lens has dioptry of refraction."

   1900, Charles Frederick Prentice, Ophthalmic lenses