Progressive power lens

Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Ophthalmic lenses or blanks

Patent

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G02C 706

Patent

active

058643800

ABSTRACT:
A progressive power eyeglass lens is disclosed. The lens is particularly suitable for close-range work while facilitating distinct vision up to a specific distance that is substantially separated from the close-view distance. The lens also provides a wide distinct-vision area in the near-vision region. The lens comprises a near-vision correction region with a surface refractive power suitable for near vision, a specific-distance-vision correction region with a surface refractive power suitable for a specific distance that is substantially separated from the close-view distance, and a progressive zone between the near-vision correction region and the specific-distance-vision correction region that provides a gradual change in refractive index from the near-vision correction region to the specific-distance-vision correction region. The length of the progressive zone from the center of the specific-distance-vision correction region to the center of the near-vision correction region is at least 15 mm, and the minimum width of the distinct-vision area in the near-vision correction region is at least 5 times the minimum width of the distinct-vision area in the progressive zone.

REFERENCES:
patent: 4762408 (1988-08-01), Shinohara
patent: 4955712 (1990-09-01), Barth et al.
patent: 5123725 (1992-06-01), Winthrop
patent: 5708493 (1998-01-01), Ahsbahs et al.

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