Toric hydrogel contact lens

Details Toric hydrogel contact lens Toric hydrogel contact lens

1979-04-25

1981-03-17

Corbin, John K.

G02C 704

Patent

active

042563690

ABSTRACT:
A toric hydrogel contact lens having an inner concave surface of the meniscus shape of a rotating liquid and the outer convex plane formed by a rotation-symmetric peripheric ring which passes to a central toric surface by means of two longitudinal strips having a toric component parallel with this component of the central surface, but of the opposite sign. These strips are linked up with the central surface in two parallel bands of mutual distance of at least 4 mm. Continuous transitions are formed between the rotation-symmetric peripheric ring, the central toric surface, and the longitudinal strips.

REFERENCES:
patent: 3660545 (1972-05-01), Wichterle
Harris, et al., "Stability of Back-Toric Prism-Ballast Hydrogel Contact Lenses," Amer. Jour. of Opt. and Phys. Optics, vol. 55, No. 1. pp. 15-18.

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