Which lens is most often used in ophthalmic prescriptions?

• A. Meniscus
• B. Plano Convex
• C. Biconvex
• D. Concave

Answer: (A)

Lenses for eyeglasses are chosen to balance the required optical power with how the lens will sit in the frame, how thick and heavy it will be, and how easy it is to manufacture. A meniscus lens uses two surfaces with different curvatures, one more curved than the other, so the overall power can be achieved with less material. This shape lets the lens be tailored to either positive or negative prescriptions while keeping edge thickness and weight down, which is why it’s the most common choice in ophthalmic prescriptions. Other shapes—like plano-convex, biconvex, or concave—don’t offer the same balance of flexibility, thickness control, and weight for a wide range of prescriptions, making them less routinely used across typical eyewear needs.