Concave or convex things (6)
I believe the answer is:
lenses
(Other definitions for lenses that I've seen before include "Camera attachments" , "They could help you see" , "The glasses in spectacles" , "Eye parts" , "Optical glasses" .)
I believe the answer is:
lenses
(Other definitions for lenses that I've seen before include "Camera attachments" , "They could help you see" , "The glasses in spectacles" , "Eye parts" , "Optical glasses" .)