General terms:
* Lens: This is the most general term for a curved piece of glass that refracts light.
* Curved surface: A simple description of the shape.
Specific shapes:
* Concave lens: Thinner in the middle, diverging light.
* Convex lens: Thicker in the middle, converging light.
* Plano-convex lens: One flat surface, one convex surface.
* Plano-concave lens: One flat surface, one concave surface.
* Meniscus lens: One concave surface, one convex surface, with different radii of curvature.
* Cylindrical lens: Curved in one dimension, used to focus light in a line.
Other terms:
* Prismatic lens: A lens that refracts light to separate different colors.
* Aspheric lens: A lens with a non-spherical surface, used for correcting aberrations.
The specific name used will depend on the context and the function of the curved glass.
