Technical note: Apparatus for comparison of progressive addition spectacle lenses

Authors


Correspondence and reprint requests to: Dr C. W. Fowler.
Tel.: +44 121 204 4098; Fax: +44 121 359 1738.
E-mail address: c.w.fowler@aston.ac.uk

Abstract

Apparatus is described for the measurement of lens power distribution across the surface of a progressive addition spectacle lens. Although the method used is different to that specified in BS 2738-7:1996, the measurements are nevertheless comparable, and are considered sufficiently accurate for making basic comparisons of lens type.

Ancillary