optical

/ˈɒptɪkəl/

IPA: /AA1 P T IH0 K AH0 L/

adjective

1
Of, or relating to sight; visual.
“Strabismus is an optical defect.”
2
Designed to assist or enhance sight
“A microscope is an optical instrument.”
3
Of, or relating to optics.
“Refraction is an optical effect.”
4
Of, or relating to visible light.
“Optical telescopes don't work when it is cloudy.”
5
Incorporating light-sensitive devices.
“An optical switch opens the door automatically.”

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