noun (used with a singular verb)
the branch of geometrical optics dealing with the formation of images by lenses.

1635–45; see dioptric, -ics

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World English Dictionary
dioptrics (daɪˈɒptrɪks)
(functioning as singular) the branch of geometrical optics concerned with the formation of images by lenses
[C20: from dioptre + -ics]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

dioptrics di·op·trics (dī-ŏp'trĭks)
The branch of optics that deals with the refraction of light.

di·op'tric adj.
The American Heritage® Stedman's Medical Dictionary
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