Contact or intraocular lens from lightly crosslinked polymer...

Details Contact or intraocular lens from lightly crosslinked polymer... Contact or intraocular lens from lightly crosslinked polymer...

G - Physics

02

C

3/112, 117/152,

G02C 7/04 (2006.01) A61F 2/16 (2006.01) G02B 1/04 (2006.01)

Patent

CA 1329069

ABSTRACT OF THE DISCLOSURE: A contact lens or intraocular lens made from a lightly crosslinked polymer of 2-hydroxyethyl methacrylate or from its copolymer, where the 2-hydroxyethyl methacrylate component prevails over the second nonhydrophilic component, has improved surface layer characteristics. The lens contains a hydrophilic, swellable, transparent surface layer and an inner part of lower swellability than the surface layer. The swellability of the surface layer decreases continuously from the surface towards the inner part to the swellability level of the inner part. The swellability of the surface layer may be up to 98% at the surface and the thickness of the surface layer may be as high as 100 µm. The finally shaped lens is treated with an alkaline reacting solution of a salt, in which the lens does not swell. The lens is then freed of all soluble substances by washing.

556219

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