Toric lens with decreased sensitivity to cylinder power and rotation and method of using the same

Patent metadata

Field	Value
Publication number	US-9987127-B2
Application number	US-201514975364-A
Country	US
Kind code	B2
Filing date	Dec 18, 2015
Priority date	Aug 27, 2007
Publication date	Jun 5, 2018
Grant date	Jun 5, 2018

Abstract

A method, system and apparatus for vision correction are disclosed. The method, system and apparatus include a toric intraocular element for correcting astigmatism and having a cylinder power, and a depth of focus extender coupled to the toric intraocular element, the depth of focus extender extending a depth of focus. The extended depth of focus may reduce sensitivity of the toric intraocular element to at least one of rotation and selected cylinder power.

First claim

The invention claimed is:

1. An intraocular lens, comprising: an optic comprising a first surface having a first shape and an opposing second surface having a second shape, the first and second shapes providing a refractive power; a diffractive pattern imposed on at least one of the first shape and the second shape; the first and second surfaces providing a base power and an add power; wherein, when the optic is placed in an intraocular lens plane of a physical eye model including a model cornea, the modulation transfer function of the eye model exceeds about 0.17, at a spatial frequency of about 50 line pairs per millimeter, over a range of at least about 1.7 Diopters.

2. An intraocular lens, comprising: a first surface having a first shape and an opposing second surface having a second shape, the first and second shapes providing a refractive power; a diffractive pattern imposed on the first shape or the second shape; the first and second surfaces providing a base power and an add power; the intraocular lens having a depth of focus, when illuminated by a light source, that is at least about 30% greater than that of an intraocular reference lens without the diffractive pattern, the intraocular reference lens having a refractive power that is equal to the base power of the intraocular lens.

3. The intraocular lens of claim 2 , wherein the light source is a polychromatic light source.

4. The intraocular lens of claim 2 , wherein the light source is at a predetermined wavelength and the intraocular lens has a depth of focus, when illuminated at the predetermined wavelength, that is at least about 50% greater than that of the intraocular reference lens.

5. The intraocular lens of claim 2 , wherein, at a spatial frequency of about 50 line pairs per millimeter, the modulation transfer function of the lens exceeds 0.17 over a depth of focus that is greater than the depth of focus for the reference intraocular lens by at least about 0.5 Diopters.

6. The intraocular lens of claim 2 , wherein the intraocular lens is optically described by a model lens, such that when the model lens is included in an intraocular lens plane of an eye model including a model cornea, the modulation transfer function of the eye model exceeds about 0.17, at a spatial frequency of about 50 line pairs per millimeter, over a range of at least about 1.7 Diopters.

Assignees

• Amo Groningen Bv

Inventors

• Bogaert Theophilus
• Weeber Hendrik A
• Zhao Huawei

Classifications

• G02C2202/02

  Mislocation tolerant lenses or lens systems · CPC title

• A61B3/0025

  characterised by electronic signal processing, e.g. eye models · 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

• G02C7/02

  Lenses; Lens systems {; Methods of designing lenses} · CPC title