Crossword Genius

Science of vision (6)

Ross

I believe the answer is:

optics

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

(Other definitions for optics that I've seen before include "Science of light/vision" , "Drink measuring devices" , "Science of light" , "Field of vision?" , "Study of the physical properties of light" .)

I've seen this clue in The Times.
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