Progressive spectacle lens

Details Progressive spectacle lens Progressive spectacle lens

1997-05-16

1998-06-23

Dang, Hung X.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

G02C 706

Patent

active

057710899

ABSTRACT:
A progressive spectacle lens is described which has a convex aspherical front surface 1 and a concave aspherical back surface 2, of which at least one surface contributes to the power increase from the distance portion 3 over the progression corridor 4 to the reading portion 5. The progressive spectacle lens in accordance with the present invention is characterized by the fact that the surface 1 or the surfaces contributing to the power increase are designed in such a way that the main portion of astigmatism is transposed into an area 3 in which the power practically does not increase and by the fact that the surface astigmatism of the two surfaces 1 and 2 substantially cancel each other out in these areas 3 or 6. (See FIG. 1).

REFERENCES:
patent: 3877798 (1975-04-01), Tolar et al.
patent: 4315673 (1982-02-01), Guilino et al.
patent: 4592630 (1986-06-01), Okazaki

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