Crossword Genius

Pertaining to vision (5)

Ross

I believe the answer is:

optic

'pertaining to vision' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for optic that I've seen before include "Like a sort of nerve" , "Device for measuring gin etc" , "Related to sight" , "Bar measure" , "Relating to the eye" .)

I've seen this clue in The Washington Post Sunday, the USA Today and The Times.
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