Bayer Aktiengesellschaft

Otto-Christian Geyer

Frank Wingler

Peter Schwabe

Ottfried Schlak

Helmut Waniczek

Reiner Voigt

Bernd W Leusner

The present invention relates to optically clear polysiloxane-based compositions which are employed, in particular, for the production of contact optical articles such as contact lenses, scleral lenses and intraocular lenses.

Optically clear silicone compositions

The invention relates to new cross-linked copolymers of N-vinyl pyrrolidone, N-alkyl-N-vinyl carboxylic acid amides, methacrylates and optionally further copolymerizing monomers of a specific composition. the copolymers have a water absorption capacity of up to about 80% by weight, based on the hydrated state, and are suitable for the production of shaped articles which are in contact with living tissue in use. Examples include soft contact lenses and scleral lenses of high mechanical strength, in particular thin to very thin lenses for prolonged wear.

Hydrophilic copolymers, the use thereof as biomedical materials and

The optical contact objects contain a wettable, optionally crosslinked copolymer comprising the components N-vinylcarboxamide, (meth)acrylates of a polysiloxane and, optionally, vinyl monomers.

Optical contact objects

Contact lenses prepared from a polymer alloy essentially free from low molecular weight plasticizers and which comprises

Use of polymer alloys based on cellulose esters in contact ophthalmics,

Contact lenses and contact shells of light-refracting material consisting essentially of a copolymer of

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Wetzlar, Germany

Otto-Christian Geyer