Rotationally stable contact lens designs

Details Rotationally stable contact lens designs Rotationally stable contact lens designs

1995-05-04

1997-07-22

Epps, Georgia Y.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

351160R, 351160H, 351174, 351176, G02B 523

Patent

active

056508379

ABSTRACT:
Non-ballasted, eyelid rotationally stabilized designs are disclosed for use in toric or multifocal toric contact lenses. The back surface of the lens includes a toric or multifocal toric surface and also thin top and bottom zones (slab offs) to achieve eyelid rotational orientation and stabilization. The advantage of this technical approach is in mold manufacturing, wherein the design allows the use of any chosen power spherical stock front mold.

REFERENCES:
patent: 4095878 (1978-06-01), Fanti
patent: 4573774 (1986-03-01), Sitterle
patent: 5020898 (1991-06-01), Townsley
patent: 5125729 (1992-06-01), Mercure
patent: 5455641 (1995-10-01), Hahne et al.

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