Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Ophthalmic lenses or blanks
Reexamination Certificate
2008-03-19
2010-11-30
Stultz, Jessica T (Department: 2873)
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Ophthalmic lenses or blanks
C351S159000, C351S163000, C351S165000, C351S175000, C359S741000, C359S742000, C359S813000
Reexamination Certificate
active
07841715
ABSTRACT:
A variable focus lens system that can be used in eyeglasses is disclosed. The system consists of superimposed first and second transparent thin lenses with surfaces divided into Fresnel zones and zone boundaries. The lenses are relatively slidable for focus adjustment. The Fresnel zone boundary surfaces are made parallel to the user's optical line of sight to reduce visual obstructions, and the zone boundaries may be restricted to areas near the lens periphery to further reduce visual obstructions. An opaque light absorbing coating may be applied to the zone boundaries to reduce light scattering. A fixed prescription lens, having the user's distance and astigmatism corrections, may be superimposed on the other two lenses.
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