Limited echelette lens, systems and methods

Patent metadata

Field	Value
Publication number	US-9557580-B2
Application number	US-201414472815-A
Country	US
Kind code	B2
Filing date	Aug 29, 2014
Priority date	May 13, 2008
Publication date	Jan 31, 2017
Grant date	Jan 31, 2017

Abstract

An ophthalmic lens with a circular surface structure and limited adjacent echelettes that provides enhanced image quality across an extended range of foci.

First claim

What is claimed is:

1. An ophthalmic lens, comprising:
an anterior face and a posterior face, the faces disposed about an optical axis;
at least one diffractive profile imposed on the anterior face or the posterior face, the at least one diffractive profile consisting of an inner echelette and from 1 to 4 peripheral echelettes, wherein the inner echelette and the 1 to 4 peripheral echelettes each comprises a parabolic optical zone; and
a refractive region between an innermost one of the peripheral echelettes and the inner echelette, wherein the peripheral echelettes are not separated by a refractive region.

2. The ophthalmic lens of claim 1 , wherein the echelettes are characterized by a surface area between 1 and 7 square millimeters.

3. The ophthalmic lens of claim 1 , wherein the echelettes have the same surface area.

4. The ophthalmic lens of claim 1 , wherein the inner echelette has a diameter within a range from about 1 mm to about 5 mm.

5. The ophthalmic lens of claim 1 , wherein the lens further comprises a peripheral portion characterized by a spherical curve or an aspherical curve.

6. The ophthalmic lens of claim 1 , wherein the echelettes further comprise transitions characterized by a step height having a value within a range from about 0.5 μm and about 4 μm.

7. The ophthalmic lens of claim 5 , wherein the step heights provide a phase shift between about 0.25 and about 3 times the design wavelength.

8. The ophthalmic lens of claim 6 , wherein the step height for at least 2 echelettes differ.

9. The ophthalmic lens of claim 6 , wherein the surface area for at least 2 echelettes differ.

Assignees

• Amo Groningen Bv

Inventors

• Weeber Hendrik A

Classifications

• G02C2202/20

  Diffractive and Fresnel lenses or lens portions · CPC title

• G02C7/06

  bifocal; multifocal {; progressive (G02C7/041 takes precedence)} · CPC title

• G02B27/0075

  with means for altering, e.g. increasing, the depth of field or depth of focus · CPC title

• A61F2/1654

  Diffractive lenses · CPC title

• A61B2034/104

  Modelling the effect of the tool, e.g. the effect of an implanted prosthesis or for predicting the effect of ablation or burring · CPC title