Crossword Genius

Relating to vision (7)

Ross

I believe the answer is:

optical

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">relating to vision</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(Other definitions for optical that I've seen before include "Working with light" , "Relating to light/vision" , "connected to light" , "Using visible light" , "Relating to sight" .)

I've seen this clue in The Times.
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