What characterizes an aspheric lens?

An aspheric lens is characterized by its surface having varying curvature, which differentiates it from traditional spherical lenses. The design of an aspheric lens allows for different curvatures across the lens surface, enabling it to reduce optical aberrations and improve image quality. This means that light can be focused more effectively than with a standard spherical lens, which has a consistent curvature throughout. Additionally, by managing how light rays pass through the lens, aspheric lenses can be thinner and lighter, providing better aesthetics and comfort for eyeglasses or optical devices. This design also helps achieve a wider field of view while minimizing distortion, which is particularly beneficial in applications like photography, eyeglasses, and optical instruments.