Cast contact lenses, apparatus and method for making same

Details Cast contact lenses, apparatus and method for making same Cast contact lenses, apparatus and method for making same

G - Physics

02

C

88/40

G02C 7/04 (2006.01) B29D 11/00 (2006.01)

Patent

CA 1105300

?o-2940 CAST CONTACT LENSES, APPARATUS AND METHOD FOR MAKING SAME ABSTRACT OF THE DISCLOSURE 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 surface. 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 on 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.

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