G - Physics – 02 – C
Patent
G - Physics
02
C
26/197, 88/40
G02C 7/04 (2006.01)
Patent
CA 1313960
ABSTRACT OF THE DISCLOSURE A flexible contact lens (20) is disclosed as having a central power portion (24), a peripheral flange portion (27), and an externally concave transition portion (26) joining the central portion and the flange portion, whereby the flange portion extends outwardly from the central portion in the manner of a hat brim. The inner edge of the peripheral flange is thereby raised from the eye surface to facilitate movement of the lens over the limbal region of the eye. The extent of the peripheral flange forward from the eye surface promotes eyelid contact to enhance movement of the lens on the eye. In a second embodiment (40), the lens further includes an externally convex transition portion (45) joining the central power portion (44) and the externally concave transition portion (46) to facilitate lens handling. The invention also includes a method of producing such a flexible contact lens including the steps of a) forming a plastic mold on a tool which is a positive pattern of one surface of the desired lens, the resulting mold being a negative pattern of that surface, b) placing unpolymerized fluid material in the mold, c) rotating the mold to spread the fluid material at a desired thickness over the inner surface of the mold, d) polymerizing the fluid material by appropriate means such as heat or ultra violet radiation, and e) machining the opposite surface of the polymerized material to the desired lens configuration.
590890
Ames Keith S.
Knoll Henry A.
Zantos Steven G.
Ames Keith S.
Bausch & Lomb Incorporated
Knoll Henry A.
Osler Hoskin & Harcourt Llp
Zantos Steven G.
LandOfFree
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