US 6,793,340 B1 · Progressive lens

Abstract

A progressive ophthalmic lens including a far vision zone, a near vision zone and an intermediate vision zone is provided having a relatively high, relatively wide near vision zone and a relatively wide intermediate zone. A surface correction(s) for reducing optical aberrations in peripheral regions of the lens may be provided within a pair of generally horizontally disposed opposed segments approximately ±22.5° above and below a generally horizontally axis passing through a fitting cross. Two or more progress ophthalmic lenses differing in prescribed addition power may be placed in series to provide a range of distance prescriptions for one or more of emmetropes, hyperopes and myopes. A method of designing the progressive ophthalmic lens is also disclosed.

Claims31

Dependent claims

A progressive ophthalmic lens element including a lens surface having

an upper viewing zone having a surface power corresponding to distance vision,
a lower viewing zone having a greater surface power than the upper viewing zone to achieve a refracting power corresponding to near vision;
and
an intermediate zone extending across the lens element having a surface power varying from that of the upper viewing zone to that of the lower viewing zone and including a corridor of relatively low surface astigmatism;
the lens surface including
a relatively high relatively wide lower viewing zone;
and
a relatively wide intermediate zone wherein the upper viewing zone and lower viewing zone are such that the ratio of the area of clear vision of the upper viewing zone to the lower viewing zone is less than approximately 3.00 and greater than approximately 2.50.

5 more elements

A series of progressive ophthalmic lens elements, each lens element including a lens surface having

an upper viewing zone having a surface power to achieve a refracting power corresponding to distance vision;
a lower viewing zone having a greater surface power than the upper viewing zone to achieve a refracting power corresponding to near vision;
and
an intermediate zone extending across the lens element having a surface power varying from that of the upper viewing zone to that of the lower viewing zone and including a corridor of relatively low surface astigmatism;
the progressive ophthalmic lens series including
lens elements having a base curve suitable for use in providing a range of distance prescriptions for one or more of emmetropes, hyperopes and myopes, each lens element differing in prescribed addition power and including a progressive design including
a relatively high, relatively wide lower viewing zone and
a relatively wide intermediate zone;
wherein the upper viewing zone and lower viewing zone are such that the ratio of the area of clear vision of the upper viewing zone to the lower viewing zone is less than approximately 3 and greater than approximately 2 ½and
wherein the dimensions of the intermediate and lower viewing zones are related to the prescribed addition power of the wearer.

7 more elements

Dependencies are inferred from the claim text.

Progressive lens

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Progressive lens

Life of this patent

Abstract

Claims31