Translating multifocal contact lens

Details Translating multifocal contact lens Translating multifocal contact lens

1994-12-06

1997-06-03

Epps, Georgia Y.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

351160H, G02C 704

Patent

active

056359985

ABSTRACT:
A multifocal contact lens is made of hard or soft lens material in an ellipsoidal shape with a base-down prismatic cross section. Lens geometry improves translation characteristics and maintains rotational stability of the lens. Near- and distance-correcting zones of the lens are separated by an arcuate junction which is convex upward.

REFERENCES:
patent: 3227507 (1966-01-01), Feinbloom
patent: 3431327 (1969-03-01), Tsuetaki
patent: 4199231 (1980-04-01), Evans
patent: 5151723 (1992-09-01), Tajiri
patent: 5173723 (1992-12-01), Volk
Mandell, Robert B; Contact Lens Practice-Hard and Flexible Lenses; Second Edition; 1974; pp. 213-214, 662-664, 388-389 and 584.
Akiyama K; "The General Study of Rectangular Bifocal Contact Lenses"; Contacto; Oct. 1960; vol. 4 No. 10 pp. 461-467.
Green, M; "preliminary Report of a New Bifocal Contact Lens"; Contacto; Mar. 1961; vol. 5 No. 3 pp. 83-89.

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