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US 6,886,938 B1Granted
Progressive addition lenses with an additional zone
AssigneeJohnson & Johnson Vision Care, Inc.
InventorEdgar V. Menezes
Life of this patent
Estimating the term…
Abstract
The invention provides multifocal lenses containing at least four zones of refractive power. The zones are positioned such that the wearer is able to use the inferior-most portion of the lens to clearly view objects at distances more than about 45 cm from the eye.
Claims20
A multifocal lens, comprising:
- a.) a distance vision power zone;
- b.) a near vision power zone comprising an add power;
- c.) an intermediate vision power zone between the distance and near vision power zones;
- and d.) a fourth zone located inferior to the near vision power zone, wherein the fourth zone has a constant power that is within about 20 to about 80% of the add power.
1 more element
A method for designing a lens, comprising the step of providing a lens comprising:
- a.) a distance vision power zone;
- b.) a near vision power zone comprising an add power;
- c.) an intermediate vision power zone between the distance and near vision power zones;
- and d.) a fourth zone located inferior to the near vision power zone, wherein the fourth zone has a constant power that is within about 20 to about 80% of the add power.
1 more element
Dependencies are inferred from the claim text.