Rotational molding of contact lenses

Details Rotational molding of contact lenses Rotational molding of contact lenses

1983-04-04

1985-11-26

Lowe, James

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Rotational molding

264 27, B29D 1100

Patent

active

045553726

ABSTRACT:
A toric or bifocal contact lens comprising a central optic zone and a peripheral zone, said peripheral zone having affixed to its anterior surface a bead, said bead on at least a part of the upper half of said peripheral zone being tapered down from a sweeping arc which intersects with the bead on each side of the lens to the uppermost point on the periphery of the lens. The lens can be prepared by casting in a mold to obtain the desired anterior surface of the lens followed by lathe cutting the posterior surface.

REFERENCES:
patent: 3211810 (1965-10-01), Gamber
patent: 3361858 (1968-01-01), Wichterle
patent: 3408429 (1968-10-01), Wichterle
patent: 3496254 (1970-02-01), Wichterle
patent: 3660545 (1972-05-01), Wichterle
patent: 3699089 (1972-10-01), Wichterle
patent: 4197266 (1980-04-01), Clark et al.
patent: 4202848 (1980-05-01), Neefe
patent: 4324461 (1982-04-01), Salvatori
"A New Corneal Lens Design for the Correction of Residual Astigmatism", Braff, Optometric Weekly, vol. 61, No. 1, Jan. 1, 1970, pp. 24 & 25.

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