optical

/ˈɑptəkəl/

/ˈɒptɪkəl/

Anything that's optical has something to do with sight. You could call your glasses an optical aid, since they help you see things more clearly.

Optical assistance comes in many forms, from glasses and contacts to binoculars and telescopes. All of these optical devices help magnify or clarify your vision. Using a big telescope to view the stars is known as optical astronomy, as opposed to the kind of astronomy that's practiced using radio signals or math. An optical illusion is a trick played on your eyes, when what they perceive is different from what is actually there.

Definitions of optical

1. adjective

   relating to or using sight
   “an optical illusion”

   synonyms: ocular, optic, visual
2. adjective

   of or relating to or resembling the eye
   synonyms: ocular, opthalmic, optic
3. adjective

   of or relating to or involving light or optics
   “optical supplies”