Double progressive spectacle lens

Details Double progressive spectacle lens Double progressive spectacle lens

2007-05-01

2007-05-01

Schwartz, Jordan M. (Department: 2873)

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

C351S177000

Reexamination Certificate

active

11128302

ABSTRACT:
A double-progressive spectacle lens in which the progressive action is distributed over the front and rear surfaces of the double-progressive spectacle lenses and described by the quotient Qin-line-formulae description="In-line Formulae" end="lead"?Q=Addvfl/AddGesamtin-line-formulae description="In-line Formulae" end="tail"?where Addvflrepresents the increase in the surface dioptric power along the principal line on the front surface between the distance area and the near area, and ADDGesamtrepresents the increase in the total dioptric power along the principal line between the distance area and the near area, and the fraction Q increases with growing distance area effect F:ⅆQ⁡(F)ⅆF⩾0.

REFERENCES:
patent: 5926250 (1999-07-01), Mukaiyama et al.
patent: 6149271 (2000-11-01), Menezes et al.
patent: 6199984 (2001-03-01), Menezes
patent: 6886938 (2005-05-01), Menezes
patent: 197 01 312 (1998-07-01), None
patent: 0 996 023 (2000-04-01), None
patent: WO 02/061496 (2002-08-01), None

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