Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Ophthalmic lenses or blanks
Patent
1996-11-18
1998-09-22
Font, Frank G.
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Ophthalmic lenses or blanks
351168, 351161, G02C 706, G02C 704
Patent
active
058122370
ABSTRACT:
Opthalmic 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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John K. Davis, "Aspheric Lenses: What's Possible--And What Isn't", Review of Optometry, May, 1978, pp. 68-74.
Irvin M. Borish et al., "Double masked study of progressive addition lenses", Journal of the American Optometric Assiciation, vol. 51, No. 10, Oct., 1980, pp. 933-943.
James E. Sheedy et al., "Vertical Yoked Prism--Patient Acceptance and Postural Adjustment", Ophthal. physiol. Opt., vol. 7, No. 3, 1987, pp. 255-257. Please note p. 256 is missing and will be provided if it becaoms available to applicant.
James E. Sheedy et al., "Optics of Progressive Addition Lenses", American Journal of Optometry & Physiological Optics, vol. 64, No. 2, Feb., 1987, pp. 90-99.
George K. Lee, "Fine Turn Your Understanding of PAL Designs", Review of Optometry, Jan. 15, 1995, pp. 69-70 and 76.
Font Frank G.
Roddy Craig W.
Stafira Michael P.
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