The degree of optical activity of a solution

(physics) The physics of light and vision. / The light-related aspects of a device. / (figuratively) Perception, image, public relations, especially in politics.

plural of optic

Of, or relating to sight; visual. / Designed to assist or enhance sight / Of, or relating to optics. / Of, or relating to visible light. / Incorporating light-sensitive devices.

(film) Any special effect requiring laboratory work on the film.

(relational) Of, or relating to the eye or to vision. / (optics, relational) Of, or relating to optics or optical instruments.

(archaic, humorous) An eye. / (optics) A lens or other part of an optical instrument that interacts with light.

regarding or using optics

plural of optical

(India) spectacles