Molds and procedure for producing truncated contact lenses

Details Molds and procedure for producing truncated contact lenses Molds and procedure for producing truncated contact lenses

1981-05-26

1983-10-04

Lowe, James B.

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Changing mold size or shape during molding or with shrinkage...

249117, 249134, 249155, 249160, 351160H, 425410, 425412, 425808, B29D 1100

Patent

active

044077661

ABSTRACT:
Truncated contact lenses are produced in a direct casting operation using a mold assembly of a male mold member and a female mold member, both of which have molding surfaces and only one of which is provided with an inwardly flexible continuous rim portion. When vulcanizable or polymerizable constituents are placed in the mold, the two mold members are brought together, the flexible rim is flexed inwardly and the finished lens of the desired shape is obtained. The flexible rim is composed of a circular portion having two ends and a straight line connecting the two ends. This defines a chord and provides the finished lens with the truncation desired.
Preferably the lens also has a toric surface and prism ballast to assist in positional stability of the lens on the eye of the wearer.

REFERENCES:
patent: 3881683 (1975-05-01), Whitney
patent: 4169119 (1979-09-01), Covington
patent: 4208364 (1980-06-01), Shepherd
patent: 4208365 (1980-06-01), Le Fevre
patent: 4209289 (1980-06-01), Newcomb et al.
patent: 4279401 (1981-07-01), Ramirez et al.
"A New Corneal Lens Design for the Correction of Residual Astigmatism", Broff, The Optometric Weekly, vol. 61, No. 1, Jan. 1, 1970, pp. 24 and 25.
"Physical Parameters for Prism Ballast PMMA Lenses", Roggenkamp, Review of Optometry, Apr. 1979, pp. 48-51.
Hydron (Polymacon) Toric Hydrophilic Contact Lens, Professional Fitting Guide; NPD Optics Inc., 1979.

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