Molds for use in contact lens production

Details Molds for use in contact lens production Molds for use in contact lens production

B - Operations, Transporting

29

D

B29D 11/00 (2006.01) B29C 33/38 (2006.01) B29C 33/42 (2006.01) B29C 45/26 (2006.01)

Patent

CA 2383676

The invention provides a mold for the production of a contact lens having an edge, the back surface of which permitting movement of the lens and tear flow between the lens' back, or concave surface, and the wearer's cornea. The shape of the lens edge formed also avoids impingement of the lens edge on the lens wearer's conjunctival membrane. The mold comprises: a front mold half comprising a first article having a central curved section with a concave surface, a convex surface and a circular circumferential edge, the central section of the concave surface suitable for imparting a curvature to the front curve of a contact lens; and, a back mold half comprising a second article having a central curved section with a concave surface and a convex surface, the central section of the convex surface suitable for imparting a curvature to the back curve of a contact lens.

L'invention concerne des moules utiles pour la fabrication de lentilles présentant des bords profilés. En particulier, ces moules permettent de fabriquer une lentille pourvue d'un bord dont la forme permet d'éviter le contact avec la membrane conjonctivale.

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