Discerning what an optician could help you to be (5-7)
I believe the answer is:
clear-sighted
I believe this is a double definition.
'discerning' is the first definition.
(similar in meaning)
'what an optician could help you to be' is the second definition.
(opticians treat eye problems)
(Other definitions for clear-sighted that I've seen before include "Discerning" , "Perceptive" , "Perspicacious" .)