Method for the manufacture of contact lenses

Details Method for the manufacture of contact lenses Method for the manufacture of contact lenses

1991-04-22

1993-04-06

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Composite or multiple layer

264 14, 264 25, 2642971, 264219, 21912169, 425808, B29D 1100

Patent

active

052001210

ABSTRACT:
In the process described, a limited number of shaping tools (T.sub.1, T.sub.2, . . . , T.sub.N) having standardized parameters (for the production of the following contact lens parameters: contact lens diameter, radius of curvature of the rear face of the contact lens, vertex refraction) is used for the manufacture of standardized moulds (M.sub.1, M.sub.2, . . . , M.sub.N). Preferably by material-removing machining of the moulds, moulds are produced that have additional altered parameters. The multiplicity of moulds produced in that manner is used for the one-step manufacture (F) of contact lenses (L) having different parameters that largely do not have to be finished.

REFERENCES:
patent: 3422168 (1969-01-01), Bowser
patent: 3423488 (1969-01-01), Bowser
patent: 3614624 (1971-10-01), Scarpino
patent: 3822089 (1974-07-01), Wichterle
patent: 3871803 (1975-03-01), Beattle
patent: 4141941 (1979-02-01), Travnicek
patent: 4254065 (1981-03-01), Ratkowski
patent: 4279401 (1981-07-01), Ramirez et al.
patent: 4455893 (1984-06-01), Astero 76107 R

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