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dioptrics

dioptrics Dioptrics is the branch of optics concerned with the refraction of light, as distinct from catoptrics, which deals with reflection.

Dioptrics is the branch of optics concerned with the refraction of light, as distinct from catoptrics, which deals with reflection. In this older usage, a diopter is the unit for lens power, based on a lens with a focal length of 1 metre.

Also see

Sources

Drafting source: Baldwin Dictionary of Philosophy and Psychology, 1901. 1901 New York Macmillan original; archive index checked 2026-10-18. “Dioptrics” (Dioptrics).
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PsychTerms (psychterms.org), CC BY 4.0, version 1. “dioptrics.” Development preview.

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