"lens" - key terms from Wikipedia

achromatic lens
aspheric lens
camera lens
canon ef lens	mount
contact lens
contact lens	wear
corrective lens
crystalline lens
cylindrical lens
ef lens	mount
fresnel lens
front of the lens	does
glass lens
intraocular lens
l lens
lens
lens	axis
lens	capsule
lens	cleaners
lens	dof scales
lens	elements
lens	epithelium
lens	fibers
lens	flare
lens	focal length
lens	hood
lens	induced
lens	mount
lens	plane
lens	shapes
lens	surface
lens	uses
lens	will
mm lens
normal lens
objective lens
ophthalmic lens
passing through the lens
perspective control lens
photographic lens
prime lens
racing club de lens
rc lens
rectilinear lens
single lens	reflex
spark lens
taking lens
telephoto lens
thin lens
zoom lens