Soft, high oxygen permeability ophtalmic lens

Details Soft, high oxygen permeability ophtalmic lens Soft, high oxygen permeability ophtalmic lens

1992-11-23

1994-04-19

Michl, Paul R.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

351160H, 52623823, 522 89, 536 183, C08F 2400

Patent

active

053045840

ABSTRACT:
A low water contact lens material having high O.sub.2 permeability, a lower water content and reduced polymer matrix size provides adequate O.sub.2 to the cornea, but does not wick water away from the eye nor allow protein or other tear components to penetrate and deposit in the lens. Such a lens is made by polymerizing and crosslinking a prepolymer which contains a cyclic polyol with polyalkylether segments containing curable segments. The cyclic polyols consist of alkoxylated glucose or sucrose which are then reacted with an isocyanate to produce an ultraviolet curable prepolymer. The prepolymer is then placed in a mold and polymerized by exposure to ultraviolet light. The free hydroxyl groups of the material react with a highly hydrophilic reagent to form covalent bonds thus making the surface of the material more wettable.

REFERENCES:
patent: 5196458 (1993-03-01), Nunez et al.

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