Prescription spectacle lens
spherocylinder spectacle lens
corneal lens（lenses） lens
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
abrasive belt grind ing
activate technique with a grind machine