Method of molding a polyvinyl alcohol contact lens
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United States of America Patent
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-
Oct 17, 1989
Grant Date -
N/A
app pub date -
Sep 30, 1987
filing date -
Feb 13, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
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.(STP).cm/cm.sup.2.sec.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.
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