Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Ophthalmic lenses or blanks
Patent
1998-03-26
1999-06-08
Font, Frank G.
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Ophthalmic lenses or blanks
G02C 706
Patent
active
059108320
ABSTRACT:
Ophthalmic no-line progressive addition lenses for spectacles are provided with increased sizes of usable intermediate and near addition zones. A preferred lens of the present invention comprises a distance zone, one or more intermediate addition zones and a near add zone wherein each of the zones has a generally spherical base curve. The intermediate and near addition zones are combined with the distance zone by connecting wedges which have aspheric base curves. An aspheric fringe is used to flatten the peripheral area of the bottom portion of the lens, thereby providing a thin and cosmetically acceptable lens.
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Font Frank G.
Roddy Craig W.
Stafira Michael P.
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