HARTMANN TEST MODIFICATION FOR MEASURING OPHTHALMIC PROGRESSIVE LENSES

We describe a modified verion of the Hartmann test in which the patter n of the holes is replaced with a circular scanning laser beam. A posi tion-sensitive detector is used to acquire the coordinates of the defl ected beam. Significant data are obtained when the Fourier transform o f the detector output signals is considered. Application of this test method to the mapping of optical parameters of ophthalmic progressive addition lenses is presented. Prismatic deviation, spherical power, an d astigmatism are measured with appropriate accuracy.