Diopter (disambiguation)

In modern usage, diopter or dioptre is a measure of the refractive power of an optical system.

Diopter may also refer to:

• Any lens system, such as a telescope
• A diopter sight
• A close-up lens used in photography
• A theodolite or similar surveyor's angle measuring device
• A dioptra, an old surveying device
• An alidade
• A surgical speculum
• An instrument for drawing the skull by projections

This disambiguation page lists articles associated with the same title. If an internal link led you here, you may wish to change the link to point directly to the intended article.