bifocal contact lens

corneal lens lens

corneal lens（lenses） lens

Lens-to-lens interval

object lens objective lens

objective lens object lens

plane-concave lens (=plano-concave lens)

plane-convex lens (=plano lens)

short focal length lens (=short-focus lens)

variable focus lens vari-focus lens

vari-focus lens variable focus lens

bifocal

bifocal aplanatic antenna

bifocal chord of a quadric

bifocal distraction

bifocal glass

bifocal glasses

Bifocal Imaging

bifocal lenses