abstract
backdrop
background
banner
biconcave
biconvex
blue
collecting
color
concave
contact
convex
cross
curvature
cutout
design
diopters
dispersal
eyeglasses
focus
glass
goggles
icon
illustration
lens
light
look
meniscus
optic
optical
optically
physics
ray
refraction
refractive
schematic
section
sharpness
spectacles
spherical
transparent
vitreous
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