different between theodolite vs diopter

English

From New Latin theodolitus (1571), of unknown origin.

theodolite (plural theodolites)

A surveying instrument, consisting of a small mounted telescope, used to measure horizontal and vertical angles.

From Latin dioptra, from Ancient Greek ??????? (dióptra).(Can this⁽⁺⁾ etymology be sourced?)

diopter (plural diopters)

A unit of measure of the power of a lens or mirror, equal to the reciprocal of its focal length in meters. Myopia is diagnosed and measured in diopters.
The dioptre adjustment mechanism of a pair of binoculars or of a camera viewfinder.
(photography, dated) A lens element attached to the front of a photographic lens to shorten the lens's minimum focus distance; also called a "close-up filter".
(obsolete) Any lens system, such as a telescope.
(obsolete) A theodolite or similar surveyor’s angle measuring device.
(obsolete) An alidade.
(obsolete) A surgical speculum.
(obsolete) An instrument for drawing the skull by projections.

dioptre, peridot, periodt, proetid, proteid, protide, pterido-, pteroid, reptoid

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