Evaluation of ophthalmic spectacle lenses using the Hartmann test.

Imaging qualities of ophthalmic spectacle lenses can be evaluated by means of the Hartmann Test. This test has traditionally been used to evaluate the lenses and mirrors used in astronomical telescopes. The test involves physical ray tracing of selected light beams and photographic sampling of those beams at planes removed from the Gaussian focus. Certain well-known progressive addition lenses have been found to show characteristic Hartmann dot patterns by which these lenses may be identified. This is of interest to the practicing optometrist for ready identification of such lenses worn by patients.