Crossword Genius

Can it retain optical images? (6)

Ross

I believe the answer is:

retina

I'm a little stuck... Click here to teach me more about this clue!

'can' is the definition.
The definition and answer can be both body parts as well as being singular nouns.
Perhaps you can see a link between them that I can't see?

'it retain optical images?' is the wordplay.
'retain' anagrams to 'RETINA'.
But, I am not clear how this is indicated.

Can you help me to learn more?

(Other definitions for retina that I've seen before include "Retain with part of eye" , "Eye's membrane" , "Membrane in eye, sensitive to light" , "part of the water pump" , "Where you focus" .)

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