Eyewear details (5)
I believe the answer is:
specs
I believe this clue is a double definition.
'eyewear' is the first definition.
(I've seen this in another clue)
'details' is the second definition.
(short for specifications)
(Other definitions for specs that I've seen before include "Glasses (sl.)" , "Detailed plan" , "Instructions" , "Glasses (colloq.)" , "shades?" .)