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The use of Newton's rings for characterising ophthalmic lenses
Author(s) -
Illueca C.,
Vazquez C.,
Hernández C.,
Viqueira V.
Publication year - 1998
Publication title -
ophthalmic and physiological optics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.147
H-Index - 66
eISSN - 1475-1313
pISSN - 0275-5408
DOI - 10.1046/j.1475-1313.1998.00366.x
Subject(s) - astigmatism , curvature , interference (communication) , optics , function (biology) , deformation (meteorology) , power (physics) , physics , computer science , mathematics , geometry , telecommunications , channel (broadcasting) , quantum mechanics , evolutionary biology , meteorology , biology
Summary The interference technique of Newton's Rings is widely used for the quality control of optical surfaces because the precision obtained with this method proves to be very satisfactory. The dimensions of the rings permits calculation of the radii of curvature of the analysed surfaces and deformation of the interference pattern can be utilised to calculate other parameters, such as astigmatism. We describe the study of progressive surfaces by means of this technique, whereby the analysis of the various points of the progressive corridor is made, and also include information on the power function for these lenses, as well as the addition and corridor length.