Manufacture of soft contact lenses having vent passageways

Details Manufacture of soft contact lenses having vent passageways Manufacture of soft contact lenses having vent passageways

1981-06-19

1982-10-12

Lowe, James B.

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Reshaping or treatment of an optical preform

351160H, B29D 1100

Patent

active

043538495

ABSTRACT:
In connection with the heretofore commonly molded soft corneal contact lens, a substitute manufacturing method is used so as to embody the lens with air vent configurations which effectively resist flattening during use, the referred to substitute method including forming impressions in the lens construction material in the locations of the air vents which increases the density in the walls bounding the air vents so that these walls do not collapse, or flatten, during use.

REFERENCES:
patent: 2393266 (1946-01-01), Riddell
patent: 2989894 (1961-06-01), Gordon
patent: 3228741 (1966-01-01), Becker
patent: 3246941 (1966-04-01), Moss
patent: 3431046 (1969-03-01), Conrad et al.
patent: 3497577 (1970-02-01), Wichterle
patent: 4053442 (1977-10-01), Jungs et al.

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