Definitions

1. adjective

not relating to or capable of being seen or perceived by the eyes; not optical

“The nonoptical properties of the crystal made it difficult to study.”

2. adjective

not using or involving light; not optical

“The nonoptical sensor detected changes in temperature and pressure.”

3. noun

something that is not optical in nature; a property or phenomenon that is not related to light or vision

“The nonoptical effects of the device were a major concern for the scientists.”