Michael A Simpson

US Patent:

6491721, Dec 10, 2002

Filed:

Jan 16, 2001

Appl. No.:

09/761070

Inventors:

Charles Freeman - Arlington TX
Mutlu Karakelle - Fort Worth TX
Michael J. Simpson - Arlington TX

Assignee:

Alcon Manufacturing, Ltd. - Fort Worth TX

International Classification:

A61F 216

US Classification:

623 656

Abstract:

A method of selecting an intraocular lens material for toric lenses is disclosed. The method comprises determining the tack of the material.

US Patent:

6923539, Aug 2, 2005

Filed:

May 12, 2003

Appl. No.:

10/437687

Inventors:

Michael J. Simpson - Arlington TX, US
Daniel R. Carson - Fort Worth TX, US

Assignee:

Alcon, Inc. - Hunenberg

International Classification:

G02C007/04

US Classification:

351160R, 351160 H

Abstract:

The present invention provides monofocal ophthalmic lenses that exhibit extended depth of field while providing sufficient contrast for resolution of an image over a selected range of defocus distances. In some embodiments, a lens of the invention can include a refractive surface having controlled surface modulations relative to a base profile. The surface modulations are designed to extend a depth of field of the lens such that a single image can be resolved, albeit with somewhat less contrast, over a range of distances greater than the focal region of a conventional lens. The ophthalmic lenses of the invention can be employed in various vision correction applications, including, but not limited to, intraocular lenses, contact lenses, instrastromal implants and other refractive devices.

US Patent:

7350916, Apr 1, 2008

Filed:

Apr 4, 2006

Appl. No.:

11/397332

Inventors:

Xin Hong - Arlington TX, US
Jihong Xie - Fort Worth TX, US
Stephen J. Van Noy - Fort Worth TX, US
Dan Stanley - Midlothian TX, US
Mutlu Karakelle - Forth Worth TX, US
Xiaoxiao Zhang - Forth Worth TX, US
Michael J. Simpson - Arlington TX, US

Assignee:

Alcon, Inc. - Hunenberg

International Classification:

G02C 7/02
A61F 2/16

US Classification:

351159, 351212, 623 611, 623 643

Abstract:

In one aspect, the present invention provide an ophthalmic lens (e. g. , an IOL) that includes an optic having an anterior optical surface and a posterior optical surface, where the optic provides an optical power in a range of about 16 D to about 25 D as measured in a medium having an index of refraction substantially similar to that of the eye's aqueous humor (e. g. , about 1. 336). At least one of the optical surfaces is characterized by an aspherical base profile such that the optic exhibits a negative spherical aberration in a range of about −0. 202 microns to about −0. 190 microns across the power range.

US Patent:

7572007, Aug 11, 2009

Filed:

Aug 2, 2006

Appl. No.:

11/497594

Inventors:

Michael J. Simpson - Arlington TX, US

Assignee:

Alcon, Inc. - Hunenberg

International Classification:

G02C 7/06
A61F 2/16
G02C 7/04

US Classification:

351168, 351161, 623 627

Abstract:

In one aspect, the present invention provides a diffractive ophthalmic lens (e. g. , a diffractive IOL) that includes an optic having an anterior surface and a posterior surface, where the optic provides a far focus. A frustrated diffractive structure comprising a plurality of diffractive zones is disposed on at least one of those surfaces so as to provide a near focus. Each zone is separated from an adjacent zone by a zone boundary that imparts an optical delay to the incident light. Further, at least two consecutive zone boundaries are configured such that a difference between their associated phase delays for at least one wavelength of the incident light is greater than about wavelength so as to direct a portion of the incident light to a location between the near and far foci.

US Patent:

7659970, Feb 9, 2010

Filed:

Nov 29, 2006

Appl. No.:

11/564498

Inventors:

Michael J. Simpson - Arlington TX, US
Jihong Xie - Fort Worth TX, US

Assignee:

Alcon, Inc. - Hunenberg

International Classification:

G01B 9/00

US Classification:

356124, 356123, 356125, 351159, 351168

Abstract:

A method and system for measuring an optical property of a multi-focal lens are disclosed. One embodiment of the method comprises: filtering out light transmitted by all but one of a plurality of diffraction orders of the lens to provide an unfiltered light from a single diffraction order; receiving the unfiltered light at a wavefront detector; and analyzing the unfiltered light at the wavefront detector to measure the optical property. The multi-focal lens can be a multi-focal diffractive intra-ocular lens. The measured optical property can be a discontinuity in the lens surface. Filtering can comprise blocking all but the unfiltered light using an aperture operable to let through the unfiltered light from the single diffraction order, and/or blocking all but the unfiltered light using an opaque obstruction operable to let through only a selected amount of light corresponding to the light transmitted by the single diffraction order. The method can further comprise generating an image quality parameter, such as a modulation transfer function, based on the measured optical property.

US Patent:

7777872, Aug 17, 2010

Filed:

Jul 29, 2008

Appl. No.:

12/181889

Inventors:

Michael J. Simpson - Arlington TX, US

Assignee:

Alcon Research, Ltd. - Fort Worth TX

International Classification:

G01B 9/00

US Classification:

356124, 351161, 351168, 351221, 356128, 356512, 356521

Abstract:

A method for measuring the optical properties of multifocal ophthalmic lenses. Collimated light is passed through an ophthalmic lens and onto an array of lenslets. Light exiting the array of lenslets is detected by a sensor. Blurred spots and/or double spots may represent diffractive zones of the wavefront. A centroid of the spot or a brighter of two spots may be used to determine the lateral position of the spot. Theoretical calculations, laboratory measurements, clinical measurements and experimental image spots may be generated, compared and cross-checked to determine a monofocal equivalent lens. A Modulation Transfer Function (MTF) may be used to evaluate and compare a diffractive lens and a monofocal equivalent lens.

US Patent:

7944553, May 17, 2011

Filed:

Feb 8, 2010

Appl. No.:

12/702076

Inventors:

Michael J. Simpson - Arlington TX, US
Jihong Xie - Fort Worth TX, US

Assignee:

Alcon, Inc. - Hunenberg

International Classification:

G01B 9/00

US Classification:

356124, 351159, 351168, 356127, 356600, 356601

Abstract:

A method and system for measuring an optical property of a multi-focal lens are disclosed. One embodiment of the method comprises: filtering out light transmitted by all but one of a plurality of diffraction orders of the lens to provide an unfiltered light from a single diffraction order; receiving the unfiltered light at a wavefront detector; and analyzing the unfiltered light at the wavefront detector to measure the optical property. The multi-focal lens can be a multi-focal diffractive intra-ocular lens. The measured optical property can be a discontinuity in the lens surface. Filtering can comprise blocking all but the unfiltered light using an aperture operable to let through the unfiltered light from the single diffraction order, and/or blocking all but the unfiltered light using an opaque obstruction operable to let through only a selected amount of light corresponding to the light transmitted by the single diffraction order. The method can further comprise generating an image quality parameter, such as a modulation transfer function, based on the measured optical property.

US Patent:

8556421, Oct 15, 2013

Filed:

Oct 19, 2011

Appl. No.:

13/276965

Inventors:

Michael J. Simpson - Arlington TX, US

Assignee:

Novartis AG - Basel

International Classification:

A61B 3/10
A61F 2/16

US Classification:

351205, 351212, 623 611

Abstract:

In certain embodiments, calculating intraocular lens (IOL) power includes determining locations of parts of an eye along an axis of the eye. The locations include the location of a cornea, the anterior and posterior locations of a crystalline lens, and the location of a retina. An IOL location of an IOL is calculated according to the anterior and posterior locations of the crystalline lens. Corneal data is also determined. The IOL power is calculated using the corneal data, the IOL location, and the retinal location. In certain embodiments, refractive indices are determined for segments of the axis, and at least one location is adjusted according to the refractive indices.