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Related to meniscus lens: negative meniscus lens, biconvex lens, biconcave lens
meniscus lens(mĕ-niss -kŭs) A lens in which the two surfaces have different or sometimes equal curvatures but, unlike a concave or convex lens, curve in the same general direction. A positive meniscus is thicker at the center than at the edges; a negative meniscus is thinner at the center. See illustration at lens.
meniscus lens[mə′nis·kəs ′lenz]
A lens with one convex surface and one concave surface.