Progressive power semi-finished spectacle lens blanks for...

Details Progressive power semi-finished spectacle lens blanks for... Progressive power semi-finished spectacle lens blanks for...

2006-12-19

2006-12-19

Sugarman, Scott J. (Department: 2873)

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

C351S176000, C351S177000

Reexamination Certificate

active

07150527

ABSTRACT:
An optical lab is provided with a set of different progressive power semi-finished spectacle lens blanks for different combinations of base curve, add power, cylinder and axis, where each semi-finished lens blank in the set has an unfinished surface and a progressive surface with a particular base curve and a particular add power. The progressive surface has been designed to provide optimal optical performance of a lens one surface of which is the progressive surface and another surface of which is a toric surface of a particular non-zero cylinder and a particular axis. Given a prescription of an astigmatic presbyope, the optical lab will select from the set the appropriate semi-finished lens blank and will surface the unfinished surface with the appropriate toric surface so that the progressive power spectacle lens matches the prescription.

REFERENCES:
patent: 4426139 (1984-01-01), van Ligten et al.
patent: 5861935 (1999-01-01), Morris et al.
patent: 6193370 (2001-02-01), Shirayanagi
patent: 6302540 (2001-10-01), Katzman et al.
patent: 6655803 (2003-12-01), Rubinstein et al.
patent: 2003/0090623 (2003-05-01), Rubinstein et al.
A. Keating, “A system matrix for astigmatic optical systems: I. Introduction and dloptric power relation”, American Journal of Optometry and Physiological Optics, vol. 58, 810-819, published 1981.

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