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

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

A scientific instrument that uses a highly focused laser beam to hold and move the microscopic or smaller objects such as atoms and droplets, in a manner similar to tweezers.

A wand-like device for optical character recognition.

plural of optical wand

The use of optical tweezers to suspend an object in air or vacuum without additional support.

Alternative spelling of optical disc

plural of optical disk

An input device consisting of a small surface with an optical sensor, integrated for some smartphones and subnotebooks.

plural of optical delusion