Shaped body, such as a contact lens, of at least two...

Details Shaped body, such as a contact lens, of at least two... Shaped body, such as a contact lens, of at least two...

G - Physics

02

C

18/106, 88/40, 2

G02C 7/04 (2006.01) B29D 11/00 (2006.01) G02B 1/04 (2006.01)

Patent

CA 1065655

ABSTRACT OF THE DISCLOSURE A shaped body, especially a contact lens, is manufactured from at least two polymerized materials with one polymerized material being swellable relative to the other polymerized material. The shaped body is formed having polymerized sections of the first material, the second material and a substantially random copolymer of the first and second material. A contact lens in accordance with the invention is provide with a center section of relatively hard transparent polymerized material and an edge section of a relatively soft hydrated transparent hydrophilic polymerized material circumscribing the center section. A transition section of a substantially random copolymer provides the direct connection between the center and edge sections of the contact lens. It has been found that this transition section provides a bond of suf- ficient strength to maintain the connection between the center and edge sections even when the hydrophilic material becomes stressed.

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