Tricurve optical metal master mold and method of making
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United States of America Patent
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-
Jul 21, 1987
Issued Date -
N/A
app pub date -
Jul 29, 1985
filing date -
May 26, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Spherical hydrophilic contact lenses having a characteristic tricurve configuration designed to correct myopia (nearsightedness) are described. The center zone (A1) of the lens is substantially thinner than the periphery (A3) allowing enhanced oxygen transmission and comfortable, increased wearing times while the thicker mid-periphery (A2) imparts necessary integrity and handling characteristics for convenience in manual manipulation. Lenses are molded or cast directly in the desired tricurve configuration using specially designed replica molds made from metal master molds.
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