Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Ophthalmic lenses or blanks
Patent
1998-10-21
2000-06-13
Mai, Huy
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Ophthalmic lenses or blanks
G02C 706
Patent
active
060740612
ABSTRACT:
A focal lens for eyeglasses includes a distance area located at an upper part of the lens, a reading area located at a lower part of the lens, and a progressive area located between the distance area and the reading area. A meridional line extends generally vertically through a center of the lens and separates the lens into a nose-side area and an ear-side area. The meridional line is shifted toward the nose-side area in the progressive area and the reading area. Equi-stigmatism curves are arranged in both the nose-side area and the ear-side area, with the distribution of the astigmatism on the ear-side being asymmetrical to the distribution of astigmatism on the nose-side. The astigmatism in the progressive area increases more slowly toward the nose-side than the astigmatism directed toward the ear-side. The progressive area includes vertical distortions which are slightly greater on the nose-side than on the ear-side at an upper part and slightly smaller on the nose-side than on the ear-side at a lower part of the progressive area.
REFERENCES:
patent: 5708493 (1998-01-01), Ahsbahs et al.
patent: 5710615 (1998-01-01), Kitani
patent: 5745211 (1998-04-01), Mukaiyama et al.
patent: 5926250 (1998-07-01), Mukaiyama et al.
Mai Huy
Tokai Kagagu Kabushiki Kaisha
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