Abstract

The analysis of progressive spectacle lenses presents a significant experimental problem. These lenses are usually characterized by two relatively large regions of single power and a blending joining the two. The blending region is nearly central in the lenses and often causes rather strong astigmatism. A method of quickly evaluating these lenses by using moire patterns generated by an image capture system is demonstrated. This method employs the generation of a reference grating by using a CCD camera to capture the image of a standard black-and-white grating. The lens in question is placed in front of the grating and the distorted grating image is stored.

© 1989 Optical Society of America