Soft contact lens and method of manufacturing the same

Details Soft contact lens and method of manufacturing the same Soft contact lens and method of manufacturing the same

1989-05-15

1990-10-30

Schofer, Joseph L.

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

Synthetic resins

Processes of preparing a desired or intentional composition...

524557, 525 61, C08J 000

Patent

active

049669249

ABSTRACT:
A soft contact lens of PVA having a tensile strength of not less than 10 kg/cm.sup.2, a water content ranging from 40 to 95% by weight, a visible light transparency of not less than 90%, and an oxygen permeability of not less than 30.times.10.sup.-11 cm.sup.3 .multidot.(STP).multidot.cm/cm.sup.2 .multidot.sec.multidot.mmHg. This soft contact lens can be prepared by forming a solution of PVA in a mixed solvent of water and an organic solvent, pouring the PVA solution in a mold having a shape of contact lens, and crystallizing at a temperature of not more than ordinary temperature. The soft contact lens has a high mechanical strength, high water content, high transparency and high oxygen permeability.

REFERENCES:
patent: 4426492 (1984-01-01), Steckler
patent: 4472542 (1984-09-01), Nambu
patent: 4559186 (1985-12-01), Lee
patent: 4619793 (1986-10-01), Lee

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