Of the eye (5)
'of the eye' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for optic that I've seen before include "What could measure the spirits" , "Teacher's maybe coming through this" , "Bar measure" , "Pub measure" , "of a viewer?" .)
'of the eye' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for ocular that I've seen before include "Relating to eyes or vision" , "Glaucoma's such" , "connected with 23 [SIGHT]" , "Connected with vision (med.)" , "Of the eyes, visual" .)