optical

adjective

pertaining to vision: visual
of or relating to the science of optics
capable of being seen: visible
designed to assist sight
of, relating to, or being objects that emit light in the visible range of frequencies
using the properties of light to aid vision
of, relating to, or utilizing light especially instead of other forms of energy
involving the use of light-sensitive devices to acquire information for a computer
of or relating to optical art

Wiktionary

Pronunciation: /ˈɒptɪkəl/ / /ˈɑptɪkəl/

adj

Etymology: Etymology tree English optic Proto-Indo-European *h₂el-der.? Proto-Italic *-ālis Latin -ālisbor. Old French -albor. ▲ Latin -ālis Old French -elbor. ▲ Latin -ālisbor. Middle English -al English -al English optical From optic + -al.

Of or relating to sight; visual.
“Strabismus is an optical defect.”
Designed to assist or enhance sight
“A microscope is an optical instrument.”
Of or relating to optics.
“Refraction is an optical effect.”
Of or relating to visible light.
“Optical telescopes don't work when it is cloudy.”
Incorporating light-sensitive devices.
“An optical switch opens the door automatically.”

noun

Any special effect requiring laboratory work on the film.
“It is a glossy film with gross, opulent opticals and little comic, or any, relief; it has the jaundiced complexion of an early 60s underground film, which it is; it is ponderous, Wagnerian, and feels about five hours long (its running time is about an hour).”
“If you plan to output back to film, opticals and effects can be shot on film or generated by computer and then transferred to film.”