optischer

Optischer is a German adjective meaning "optical" or "pertaining to optics or sight." It is used to describe light-related phenomena, devices, or qualities. The word derives from the Greek root opsis (sight) and is related to the German nouns Optik and the adjective optisch; in English, the corresponding term is “optical.”

In technical and everyday language, optischer appears in many compound expressions. Examples include optische Linsen (optical lenses), optische Fasern (optical fibers), optische Filter (optical filters), optische Sensoren (optical sensors), and optische Beschichtungen (optical coatings). The form of the adjective changes with case and article: ein optischer Sensor (a sensor) or der optische Filter (the optical filter). The phrase im optischen Bereich means “in the optical domain.”

Beyond science and engineering, optischer is also used in branding and product labeling, where the adjective can appear capitalized as part of a name or heading. In general, optischer is understood as the German counterpart to the English word “optical,” and it appears across disciplines such as physics, engineering, photography, and design to describe light-based phenomena, instruments, and qualities.