A lens with a curved surface that is not part of a simple sphere. Unlike traditional spherical lenses, aspherical lenses reduce optical aberrations such as distortion and spherical aberration, resulting in sharper, clearer images. They also allow for more compact lens designs, making them ideal for wide-angle, zoom, and high-performance lenses in both photography and cinematography. Aspherical lenses improve image quality, particularly at the edges of the frame, while keeping the lens size and weight smaller.