The degree of optical activity of a solution

A modern data storage medium consisting of a flat disc read mechanically by illumination with laser light. Formats include the Laserdisc, compact disc, DVD, and Blu-ray.

Optical discs used to store data, including such formats as Laserdisc, compact disc, DVD, and Blu-ray.

That does not involve vision / That does not use optics

(physics) A device that employs a focused laser beam to trap, manipulate and image very small particles

(physics) The rotation of the plane of polarization of plane polarized light as it passes through a chiral medium

plural of optical fiber

plural of optical disc

(informal) Astronomy using observations using telescopes and recording media that capture visible light. / (astronomy) Astronomy using infrared, visible, and/or ultraviolet wavelengths.

plural of optical isomer