optical
/ˈɑptɪkəl/ adjective C1- 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.
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