What type of lens design is most commonly produced today?

The most commonly produced lens design today is aspheric designs. These lenses are engineered to have a gradual change in curvature, which allows them to focus light more precisely than traditional spherical lenses. Aspheric designs help minimize optical aberrations, particularly in high-powered prescriptions, resulting in improved visual clarity and a wider field of view.

Additionally, aspheric lenses are often thinner and lighter than their spherical counterparts, making them more comfortable to wear, especially for individuals with strong prescriptions. The design also allows for a more aesthetically pleasing profile, as they can reduce the "bug-eye" effect associated with thick lenses.

This combination of benefits makes aspheric lenses highly favored in the optical industry, catering to a broad range of vision corrections while maximizing wearer comfort and visual performance.