Optics (from ??????, appearance or look in Ancient Greek) is the science that describes the behavior and properties of light and the interaction of light with matter.
http://en.wikipedia.org/wiki/Optics

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http://dictionary.reference.com/search?q=optical

In computing, sound reproduction, and video, an optical disc is a flat, circular disc (usually polycarbonate) wherein data are stored in the pits (or bumps) in its flat surface ...
http://en.wikipedia.org/wiki/Optical_media

General Optical Council official Web site. ... Our purpose is to protect the public by promoting high standards of education and conduct amongst opticians.
http://www.optical.org/

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