Eye part (6)

'eye part' is the definition.
(I know that retina is part of eye)
This is all the clue.
(Other definitions for retina that I've seen before include "Eye's membrane" , "Membrane in eye, sensitive to light" , "Membrane that can become detached" , "Sensitive part of eye" , "Sensitive layer in eye" .)
'eye part' is the definition.
(I know that eye has part or parts sclera)
This is the entire clue.
(Other definitions for sclera that I've seen before include "Membrane" , "Eyeball's outer cover" , "Bit of a looker" , "tissue in the eye" , "part of the eye" .)
'eye part' is the definition.
('eyelid' is part of 'eye')
This is the entire clue.
(Other definitions for eyelid that I've seen before include "Skin over viewer" , "It's used in blinking" , "Natural optic cover" , "Cover for cornea" , "Natural optical cover" .)
'eye part' is the definition.
(I know that cornea is part of eye)
This is the entire clue.
(Other definitions for cornea that I've seen before include "Front covering of eye" , "Outer covering of the eye" , "Transparent outer covering of eyeball" , "Clear part of the eye" , "Observer section?" .)
'eye part' is the definition.
(iris is a part of the eye)
This is all the clue.
(Other definitions for iris that I've seen before include "may open up in camera" , "Bright flower or eye part" , "In the middle of which pupil is opening" , "Flag - surrounding pupil" , "Part of the eye, usually brown or blue" .)
'eye part' is the definition.
('lens' is part of 'eye')
This is the entire clue.
(Other definitions for lens that I've seen before include "town in France" , "Part of telescope" , "Dark cloud; shining light" , "Through which to view" , "Transparent optical devices" .)
'eye part' is the definition.
(I know that pupil is part of eye)
This is all the clue.
(Other definitions for pupil that I've seen before include "Eye's centre" , "bit of a looker" , "Schoolboy or eye part" , "One under instruction" , "Centre of iris, in the eye" .)