Lens
optical device which transmits and refracts light
Rapid Rectilinear
Stokes lens
Dioptric correction
liquid lens
mirror
Progressive lens
visby lenses
Barlow lens
reading stone
eyepiece
corrective lens
Nimrud lens
thin lens
intraocular lens
achromatic lens
convex lens
cardinal point
CinemaScope
Mangin mirror
toric lens
doublet
concave lens
Meniscus corrector
trifocal lenses
bifocal lens
spherical lens