Eyeglass Lenses - Aspheric

The Aspheric lens design is an important tool in helping to provide better vision to all patients. Aspheric lenses are thinner, reduce lens weight and provide better off axis performance allowing increased visual acuity through a wider portion of the lens.

An aspheric lens is simply defined as a lens varying slightly from a perfect, spherical shape. Why is that important to an Optician when designing a lens? When designing a lens there are a few aberrations that an optician has to deal with to provide a lens that improves the sight of a patient. These aberrations include spherical Aberration, coma, radial astigmatism, curvature of field, and distortion. These five aberrations collectively are known as the Seidel Aberrations described by Ludwig Von Seidel in the 1850's. The aspheric lens is designed to correct a spherical aberration.