An aspheric lens or asphere (often labeled ASPH on eye pieces) is a lens whose surface profiles are not portions of a sphere or cylinder. ... The asphere's more complex surface profile can reduce or eliminate spherical aberration and also reduce other optical aberrations such as astigmatism, compared to a simple lens.

Are aspheric lenses better?

Aspheric lenses are smoother and flatter, reducing the distortion that occurs when someone wears glasses. For many people, this improvement means feeling better in their glasses and being more willing to wear their corrective lenses. Aspheric lens elements are also more complex than spherical lenses.

What is a Nikon aspherical lens?

Aspherical lenses are lenses with complex curved surfaces, where the radius of curvature changes according to distance from the light beam axis. ... Based on Nikon's long experience in aspherical fabrication, we provide optimal solutions for various customer needs.