Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Ophthalmic lenses or blanks
Patent
1988-06-23
1989-06-13
Bovernick, Rodney B.
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Ophthalmic lenses or blanks
G02C 706
Patent
active
048386740
ABSTRACT:
In this lens, the curvature of the main meridian curve of power progression (MP) begins to vary from a point (A3) situated within the intermediate vision zone (VI) at a predetermined distance d1 from the point (A1) on the main meridian curve (MP) situated at the bottom of the far vision zone (VL), and it continues to vary down to a point (A4) situated in the near vision zone (VP) on an extension (MP') of the main meridian curve (MP), and at a predetermined distance d2 from the point (A2) on the main meridian curve (MP) situated at the top of the near vision zone (VP), with the curvature difference between the points (A2 and A4) having a predetermined value .DELTA.C. The values of d1, d2, and .DELTA.C are decreasing functions of the power addition A between the points (A1 and A2).
REFERENCES:
patent: 4315673 (1982-02-01), Guilino et al.
patent: 4676610 (1987-06-01), Barkan et al.
Bovernick Rodney B.
Essilor International "Compagnie Generale d'Optique"
Sugarman Scott J.
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