Certified Paraoptometric (CPO) Practice Exam 2025

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Which term describes a lens that has one curved surface?

Aspherical
Biconvex
Spherical
Cylindrical

The correct answer is: Spherical

The term that describes a lens with one curved surface is indeed "spherical." A spherical lens is characterized by a uniform curvature that can either be convex or concave, forming part of a sphere. This design means that the lens is symmetrical and has a consistent focal point. While "aspherical," "biconvex," and "cylindrical" refer to other types of lens configurations, they do not fit the description provided. An aspherical lens has a non-uniform curvature that minimizes optical distortion and is more complex than a simple spherical one. Biconvex lenses have two outwardly curved surfaces, making them distinct from the definition of a single curved surface. Cylindrical lenses have a specific curvature in one direction and are typically used to correct astigmatism, thus also not aligning with the requirement of having just one curved surface.