optical

adjective

1. 1

   Of, or relating to sight; visual.

   “Strabismus is an optical defect.”

2. 2

   Designed to assist or enhance sight

   “A microscope is an optical instrument.”

3. 3

   Of, or relating to optics.

   “Refraction is an optical effect.”

4. 4

   Of, or relating to visible light.

   “Optical telescopes don't work when it is cloudy.”

5. 5

   Incorporating light-sensitive devices.

   “An optical switch opens the door automatically.”