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Modern optical lenses are commonly referred to as meniscus lenses due to their unique shape, which is characterized by a central curve that varies in relation to the curvature on both sides of the lens. These lenses can be either convex or concave, but the defining feature is the combination of the two curvatures, creating a more efficient and effective way to focus light. Meniscus lenses are particularly popular in eyeglasses and other optical devices because they help reduce distortion and improve visual clarity.

The term "meniscus" itself derives from the lens’s resemblance to a crescent shape, similar to that seen when viewing the surface of water in a curved container. This design allows for the manipulation of light rays entering the lens, leading to better visual outcomes for the wearer. Therefore, when discussing modern optics, referring to lenses as meniscus accurately captures the advanced geometrical design that enhances optical performance.