Abstract

Progressive addition spectacle lenses (PALs) have one surface which is a non-rotationally symmetric aspheric, the second surface being spherical or toroidal as demanded by the prescription. Although such lenses are checked using conventional focimeters for distance prescription, reading addition and prism, this only gives the minimum information about a lens. For a complete picture, the power distribution over the whole lens is required.

© 1995 Optical Society of America