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US 8,297,751 B2Granted
Multi-focal lenses with segmented boundaries
AssigneesCarl Zeiss Vision GmbH, Carl Zeiss Vision International GmbH
InventorsRay Steven Spratt, Darryl Meister, Wolf Krause
Life of this patent
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Abstract
The invention provides multi-focal segmented lenses with boundaries that include at least one blended portion and at least one sharp portion. The lenses may possess, for example, the aesthetic advantage of blended multi-segment or progressive lenses while largely retaining the functional advantage of multi-segment lenses with sharp segment boundaries.
Claims20
An ophthalmic lens having first and second surfaces, the lens comprising:
- a first zone having a first dioptric power distribution;
- a second zone having a second dioptric power distribution different from the first dioptric power distribution, a boundary of the second zone comprising first and second portions, wherein a surface gradient of the first surface varies discontinuously across the first portion, and wherein the first portion is located in an upper region of the boundary of the second zone;
- and
- a third zone separating the first zone from the second zone only along the second portion of the boundary, wherein the surface gradient varies substantially continuously within the third zone from the first zone to the second zone.
1 more element
An ophthalmic lens comprising:
- a first zone having a first dioptric power distribution that is adapted for distance viewing;
- a second zone having a second dioptric power distribution that is progressive and adapted for intermediate-range viewing in an upper portion of the second zone and substantially constant and adapted for near viewing in a lower portion of the second zone, a boundary of the second zone comprising a shorter portion in an upper region thereof;
- and
- a third zone separating the first zone from the second zone only along a longer portion of the boundary,
- wherein a surface gradient varies substantially continuously within the third zone between the first and second zones.
2 more elements
Dependencies are inferred from the claim text.