Method of making toric lenses

Details Method of making toric lenses Method of making toric lenses

1979-01-15

1979-12-18

Lowe, James B.

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Utilizing plasma, electric, electromagnetic, particulate, or...

264219, 264220, 264313, B29D 1100

Patent

active

041794842

ABSTRACT:
A method of making plastic toric lenses by casting a liquid monomer in a container having the required toric curve on the bottom of the container, polymerizing the monomer to form a solid having a toric optical surface formed within the container and cutting a second optical surface on the solid lens material with the container supporting the lens material during the cutting and polishing operation.
The container or mold used for casting the lens is made by applying pressure to two opposing sides of a heat softened resinous cylinder to change the shape of the cylinder from a circle to an ellipse, and to change the bottom shape of the cylinder from a spherical surface to a toric surface. The cylinder is then allowed to cool before the pressure is removed.

REFERENCES:
patent: 3422168 (1969-01-01), Bowser
patent: 3876734 (1975-04-01), Howden
patent: 3903218 (1975-09-01), Humphrey

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