Krishnakumar Venkateswaran

US Patent:

20100312337, Dec 9, 2010

Filed:

May 14, 2010

Appl. No.:

12/780381

Inventors:

Xiaoxiao Zhang - Fort Worth TX, US
Costin Eugene Curatu - Crowley TX, US
Krishnakumar Venkateswaran - Burleson TX, US
Daniel Robert Carson - Fort Worth TX, US
Mutlu Karakelle - Fort Worth TX, US
Xin Hong - Fort Worth TX, US
Yueai Liu - Fort Worth TX, US

International Classification:

A61F 2/16
G02C 7/10

US Classification:

623 631, 351163, 351177

Abstract:

An ophthalmic lens includes an optical filter operable to filter out at least visible light having a wavelength less than 450 nm. The lens also includes a first diffractive structure adapted to produce a focus for visible light in a first wavelength range above 550 nm and to reduce longitudinal chromatic aberration to less than one diopter for incoming visible light in the first wavelength range. The lens also includes a second diffractive structure outside the first diffractive structure in a radial direction and adapted to produce a focus for visible light in a second wavelength range between 450 nm and 550 nm. The second diffractive structure is also adapted to reduce longitudinal chromatic aberration for incoming visible light in the second wavelength range to less than one diopter while allowing longitudinal chromatic aberration in the first wavelength range in an amount greater than the first diffractive structure.

US Patent:

20130226293, Aug 29, 2013

Filed:

Feb 25, 2013

Appl. No.:

13/775517

Inventors:

Novartis AG - , US
Krishnakumar Venkateswaran - Burleson TX, US

Assignee:

Novartis AG - Fort Worth TX

International Classification:

A61F 2/16

US Classification:

623 622, 623 637

Abstract:

In one aspect, an accommodative intraocular lens (IOL) is disclosed that includes an optic having at least a portion formed of a polarizable and/or and electro-active material. Once implanted in a subject's eye, a change in the index of refraction of the polarizable and/or electro-active portion in response to forces applied to the optic via the eye's ciliary muscle can cause a change in the optical power of the optic, thereby allowing accommodation.

US Patent:

20100131060, May 27, 2010

Filed:

Nov 19, 2009

Appl. No.:

12/621613

Inventors:

Michael J. Simpson - Arlington TX, US
Krishnakumar Venkateswaran - Burleson TX, US

International Classification:

A61F 2/16

US Classification:

623 624

Abstract:

The present invention generally provides multifocal ophthalmic lenses, e.g., multifocal intraocular lenses, that employ a central refractive region for providing a refractive focusing power and a diffractive region for providing diffractive focusing powers. The refractive focusing power provided by the lens's central region corresponds to a far-focusing power that is substantially equal to one of the diffractive focusing powers while the other diffractive power corresponds to a near-focusing power. The far-focusing power can be enhanced by changes to the phase of the central refractive region and/or changes to the curvature of the central refractive region.