Positive Meniscus Lenses And Negative Meniscus Lenses
The Positive Meniscus
Lenses are a convex-concave lens, but it is thicker at the center than
at the edges. They are felt polished and are used universally in the
ophthalmic industry where convention dictates that lens power be
specified in Diopters.
The Negative Meniscus Lenses are a convex-concave lens, but it is
thinner at the center than at the edges. Otherwise description is
similar to Plano Concave lenses.