Progressive refractive power lens

Details Progressive refractive power lens Progressive refractive power lens

2007-01-09

2007-01-09

Schwartz, Jordan (Department: 2873)

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

C351S168000, C351S164000

Reexamination Certificate

active

10504967

ABSTRACT:
It has been difficult to manufacture an inside surface progressive-power lens which is as thin as an outside surface progressive-power lens due to a limited configuration of an object-side refractive surface of the inside surface progressive-power lens. However, a thin progressive-power lens with less blur and distortion can be provided at a reduced cost by forming its object-side refractive surface from an aspherical surface which is symmetric with respect to a rotational axis and has a smaller curvature at a distance reference point than that at a near reference point, and by forming an eyeball-side refractive surface from a combination of a progressive surface, an astigmatic refraction surface and an “as-worn” corrective aspherical surface.

REFERENCES:
patent: 4640593 (1987-02-01), Shinohara
patent: 5892565 (1999-04-01), Ueno et al.
patent: 6086203 (2000-07-01), Blum et al.
patent: 6505934 (2003-01-01), Menezes
patent: 6964478 (2005-11-01), Welk et al.

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