"lens" - key terms from Wikipedia

aspheric lens
contact lens
contact lens	wear
corrective lens
crystalline lens
cylindrical lens
diopter lens
ef lens	mount
fisheye lens
fresnel lens
glass lens
headlamp lens
intraocular lens
l lens
lens
lens	axis
lens	capsule
lens	cleaners
lens	design
lens	dof scales
lens	elements
lens	epithelium
lens	fibers
lens	flare
lens	focal length
lens	hood
lens	induced
lens	manufacturer
lens	mount
lens	plane
lens	thickness
lens	will
life thru a lens
mm lens
natural lens
normal lens
objective lens
ophthalmic lens
passing through the lens
perspective control lens
photographic lens
prime lens
racing club de lens
rc lens
spark lens
swing lens
taking lens
telephoto lens
thin lens
zoom lens