Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Ophthalmic lenses or blanks
Patent
1977-07-25
1979-08-21
Corbin, John K.
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Ophthalmic lenses or blanks
264 1, G02C 704
Patent
active
041651588
ABSTRACT:
Casting a contact lens directly to finished size, shape and edge configuration. Casting is accomplished between concave and convex mold halves which respectively provide lens front and base curve forming surfaces. The rim of the concave front-forming surface is circular and makes continuous line contact with a spherical surface extended annularly about the convex base curve-forming surface to produce a vanishing thin edge without flashing about the cast lens. Provision is made for modification of the cross-sectional configuration of the circular rim and/or annular mold surface according to changes in lens edge profile needed to meet particular requirements for optimum lens fitting comfort.
REFERENCES:
patent: 3187338 (1965-06-01), Neefe
patent: 3691263 (1972-09-01), Stoy et al.
patent: 3761208 (1973-09-01), Boudet et al.
patent: 3781096 (1973-12-01), Townsley
patent: 3915609 (1975-10-01), Robinson
patent: 4103992 (1978-08-01), Breger et al.
Mandel, R. B., "The Calculation of Contact Lens Edge Thickness," Optometric Weekly; vol. 55, No. 3 (1-16-64); pp. 19-21.
Mandel, R. B., Contact Lens Practice: Hard and Flexible Lenses, pp. 381-382.
Journal of the American Optometric Association, Mar. 1976, p. 274 (advert.).
American Optical Corporation
Corbin John K.
Duggan Jeremiah J.
Schneeberger Stephen A.
Spencer Alan H.
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