Patents by Inventor Kamal K. Das
Kamal K. Das has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20230120238Abstract: A multi-part intraocular lens (IOL) with an interchangeable optic seated on a base and secured by a locking mechanism. The optic comprises an anterior surface with a diameter greater than a diameter of a ring of the base. The posterior side of the optic has a posterior surface, a transition region for contact with the base, and sidewalls and tabs radially outward of the transition region. The sidewalls and tabs overlap at least a portion of the ring to reduce or even prevent decentration and tilt of the optic. Each tab has a lateral extension for coupling to the base.Type: ApplicationFiled: December 20, 2022Publication date: April 20, 2023Inventors: Kamal K. Das, William Jacob Spenner Dolla
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Patent number: 11607308Abstract: An exemplary ophthalmic lens includes an optic comprising an anterior optic surface and a posterior optic, and a multi-curvature optical edge surrounding the optic and connecting the anterior optic surface to the posterior optic surface, the multi-curvature optical edge comprising a plurality of tangentially-connected curved surfaces configured to mitigate positive dysphotopsia by directing or diffusing from light incident on the multi-curvature optical edge away from a fovea of a patient.Type: GrantFiled: April 5, 2019Date of Patent: March 21, 2023Assignee: Alcon Inc.Inventors: Kamal K. Das, Jian Liu
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Patent number: 11559393Abstract: A multi-part intraocular lens (IOL) with an interchangeable optic seated on a base and secured by a locking mechanism. The optic comprises an anterior surface with a diameter greater than a diameter of a ring of the base. The posterior side of the optic has a posterior surface, a transition region for contact with the base, and sidewalls and tabs radially outward of the transition region. The sidewalls and tabs overlap at least a portion of the ring to reduce or even prevent decentration and tilt of the optic. Each tab has a lateral extension for coupling to the base.Type: GrantFiled: March 2, 2021Date of Patent: January 24, 2023Assignee: Alcon Inc.Inventors: Kamal K. Das, William Jacob Spenner Dolla
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Publication number: 20220382075Abstract: Certain embodiments described herein are directed to a multifocal ophthalmic lens including a base lens having a base curvature corresponding to a base power, and a diffractive structure comprising a central zone and a plurality of annular echelettes formed on a first surface of the base lens. A radial spacing of each of the plurality of annular echelettes is constant throughout the diffractive structure.Type: ApplicationFiled: May 26, 2022Publication date: December 1, 2022Inventors: Behzad Bordbar, Kamal K. Das
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Publication number: 20220346941Abstract: An ophthalmic lens may comprise a posterior optic surface, an anterior optic surface, and an optic edge between the posterior optic surface and the anterior optic surface, wherein the optic edge forms a substantially circular perimeter having a thickness that varies periodically. The thickness of the optic edge may vary periodically for at least two cycles. Additionally, or alternatively, the ophthalmic lens may comprise an optic skirt coupled to the optic edge. The optic skirt can be configured to inhibit transmission of light around the optic edge.Type: ApplicationFiled: April 28, 2022Publication date: November 3, 2022Inventors: Kamal K. Das, David L. Jinkerson, William Jacob Spenner Dolla
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Publication number: 20220192820Abstract: An ophthalmic lens may comprise a posterior optic surface and an anterior optic surface, which may comprise a central optic, a peripheral optic, and a capsule rim separating the central optic and the peripheral optic. An optic edge may couple the posterior optic surface to the peripheral optic. The capsule rim may be symmetric or asymmetric in various embodiments. In more particular embodiments, the capsule rim may form a surface at an angle of at least ninety (90) degrees to the peripheral optic. In some embodiments, the central optic may comprise an optic axis, and the capsule rim may form a surface that is substantially parallel to the optic axis.Type: ApplicationFiled: December 9, 2021Publication date: June 23, 2022Inventors: James M. Scott, Kamal K. Das
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Publication number: 20210275291Abstract: A multi-part intraocular lens (IOL) with an interchangeable optic seated on a base and secured by a locking mechanism. The optic comprises an anterior surface with a diameter greater than a diameter of a ring of the base. The posterior side of the optic has a posterior surface, a transition region for contact with the base, and sidewalls and tabs radially outward of the transition region. The sidewalls and tabs overlap at least a portion of the ring to reduce or even prevent decentration and tilt of the optic. Each tab has a lateral extension for coupling to the base.Type: ApplicationFiled: March 2, 2021Publication date: September 9, 2021Inventors: Kamal K. Das, William Jacob Spenner Dolla
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Publication number: 20200197164Abstract: An exemplary ophthalmic lens includes an optic comprising an anterior optic surface and a posterior optic, and a multi-curvature optical edge surrounding the optic and connecting the anterior optic surface to the posterior optic surface, the multi-curvature optical edge comprising a plurality of tangentially-connected curved surfaces configured to mitigate positive dysphotopsia by directing or diffusing from light incident on the multi-curvature optical edge away from a fovea of a patient.Type: ApplicationFiled: April 5, 2019Publication date: June 25, 2020Inventors: Kamal K. Das, Jian Liu
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Publication number: 20190307555Abstract: An intraocular lens includes an optic having an anterior optic surface, a posterior optic surface, and an optic edge extending between the anterior optic surface and a posterior optic surface. The optic edge includes a convex portion extending from a periphery of the anterior optic surface and a flat portion extending from a periphery of the posterior optic surface such that a corner edge is formed between the optic edge and the posterior optic surface. The flat portion intersecting the convex portion to form the optic edge. Such an optic edge may eliminate glare or other undesired effects that adversely impact quality of vision.Type: ApplicationFiled: April 5, 2019Publication date: October 10, 2019Inventors: Kamal K. Das, Jian Liu
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Patent number: 9931201Abstract: An intraocular lens (IOL) has an optic, a peripheral rim, and a reduced thickness region connecting the optic to the peripheral rim. The peripheral rim has a continuously curving outer edge that it does not include any tangents parallel to the optical axis either along its length or at the intersection of the outer edge with the anterior or posterior surfaces of the IOL.Type: GrantFiled: January 3, 2017Date of Patent: April 3, 2018Assignee: Novartis AGInventors: Robert D. Angelopoulos, Kamal K. Das, Jonathan McCann
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Publication number: 20170112613Abstract: An intraocular lens (IOL) has an optic, a peripheral rim, and a reduced thickness region connecting the optic to the peripheral rim. The peripheral rim has a continuously curving outer edge that it does not include any tangents parallel to the optical axis either along its length or at the intersection of the outer edge with the anterior or posterior surfaces of the IOL.Type: ApplicationFiled: January 3, 2017Publication date: April 27, 2017Inventors: Robert D. Angelopoulos, Kamal K. Das, Jonathan McCann
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Patent number: 9566150Abstract: An intraocular lens (IOL) has an optic, a peripheral rim, and a reduced thickness region connecting the optic to the peripheral rim. The peripheral rim has a continuously curving outer edge that it does not include any tangents parallel to the optical axis either along its length or at the intersection of the outer edge with the anterior or posterior surfaces of the IOL.Type: GrantFiled: October 22, 2013Date of Patent: February 14, 2017Assignee: Novartis AGInventors: Robert D. Angelopoulos, Kamal K. Das, Jonathan McCann
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Publication number: 20140180408Abstract: An intraocular lens (IOL) has an optic, a peripheral rim, and a reduced thickness region connecting the optic to the peripheral rim. The peripheral rim has a continuously curving outer edge that it does not include any tangents parallel to the optical axis either along its length or at the intersection of the outer edge with the anterior or posterior surfaces of the IOL.Type: ApplicationFiled: October 22, 2013Publication date: June 26, 2014Applicant: NOVARTIS AGInventors: ROBERT D. ANGELOPOULOS, KAMAL K. DAS, JONATHAN MCCANN
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Patent number: 8556417Abstract: In certain embodiments, an ophthalmic lens comprises an optic. The optic has an optical axis and surfaces comprising an anterior surface and a posterior surface. At least one of the surfaces has an inner refractive region and a refractive-diffractive structure disposed outwardly from the inner refractive region in a direction away from the optical axis. The inner refractive region is adapted to contribute refractively to a distance focus optical power. The refractive-diffractive structure comprises one or more diffractive regions and one or more refractive regions. A diffractive region is adapted to contribute diffractively to a multi-zone optical power, and a refractive region is adapted to contribute refractively to the distance focus optical power.Type: GrantFiled: February 2, 2012Date of Patent: October 15, 2013Assignee: Novartis AGInventors: Kamal K. Das, Mutlu Karakelle
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Publication number: 20130201445Abstract: In certain embodiments, an ophthalmic lens comprises an optic. The optic has an optical axis and surfaces comprising an anterior surface and a posterior surface. At least one of the surfaces has an inner refractive region and a refractive-diffractive structure disposed outwardly from the inner refractive region in a direction away from the optical axis. The inner refractive region is adapted to contribute refractively to a distance focus optical power. The refractive-diffractive structure comprises one or more diffractive regions and one or more refractive regions. A diffractive region is adapted to contribute diffractively to a multi-zone optical power, and a refractive region is adapted to contribute refractively to the distance focus optical power.Type: ApplicationFiled: February 2, 2012Publication date: August 8, 2013Inventors: Kamal K. Das, Mutlu Karakelle
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Patent number: 7998197Abstract: Exemplary embodiments provide a coated intraocular lens that has a lens body with a first refractive index and an anti-reflective coating. The coating covers at least a portion of the lens body and has a second index of refraction that is less than the first index of refraction of the lens body. The anti-reflective coating reduces the intensity of reflections produced from off axis light incident on the lens body by at least a factor of 2.5 times and enhancing light transmission.Type: GrantFiled: July 11, 2008Date of Patent: August 16, 2011Assignee: Novartis AGInventors: Xiaoxiao Zhang, Kamal K. Das
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Publication number: 20090237615Abstract: In one aspect, the present invention provides a method of designing an ocular implant (e.g., an IOL), which comprises establishing corneal topography of a patient's eye, e.g., by performing one or more wavefront aberration measurements of the eye, prior to an ocular surgery. The method further includes ascertaining an astigmatic aberration of the cornea that is expected to be induced by the surgery and determining a toricity of a surface of an ocular implant, which is intended for implantation in the patient's eye, so as to enable the implant to compensate for the surgically-induced aberration.Type: ApplicationFiled: April 2, 2009Publication date: September 24, 2009Inventors: Kamal K. Das, Xiaoxiao Zhang, Mutlu Karakelle, Xin Hong
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Publication number: 20090160075Abstract: In one aspect, the present invention provides methods for custom fabrication of IOLs. In some embodiments, such methods call for measuring one or more aberrations of a patient's eye, and determining the profile of at least one surface of an IOL that would ameliorate, and control those aberrations. The surface profile can then be imparted to a surface of a starting lens (or a lens blank) via ablation, e.g., by utilizing an excimer laser beam. In some other embodiments, the measured aberrations can be utilized to determine the profile of at least one surface of a wafer mold. A wafer mold having that surface profile can then be fabricated, e.g., by ablating a slab or an existing wafer of appropriate material, and the mold can be used to fabricate an IOL suitable for implantation in the patient's eye.Type: ApplicationFiled: December 17, 2008Publication date: June 25, 2009Inventors: Michael J. Simpson, Daniel R. Carson, Kamal K. Das
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Publication number: 20090018651Abstract: Exemplary embodiments provide a coated intraocular lens that has a lens body with a first refractive index and an anti-reflective coating. The coating covers at least a portion of the lens body and has a second index of refraction that is less than the first index of refraction of the lens body. The anti-reflective coating reduces the intensity of reflections produced from off axis light incident on the lens body by at least a factor of 2.5 times and enhancing light transmission.Type: ApplicationFiled: July 11, 2008Publication date: January 15, 2009Applicant: ALCON, INC.Inventors: Xiaoxiao Zhang, Kamal K. Das
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Publication number: 20080004698Abstract: In one aspect, the present invention provides a method of designing an ocular implant (e.g., an IOL), which comprises establishing corneal topography of a patient's eye, e.g., by performing one or more wavefront aberration measurements of the eye, prior to an ocular surgery. The method further includes ascertaining an astigmatic aberration of the cornea that is expected to be induced by the surgery and determining a toricity of a surface of an ocular implant, which is intended for implantation in the patient's eye, so as to enable the implant to compensate for the surgically-induced aberration.Type: ApplicationFiled: June 30, 2006Publication date: January 3, 2008Inventors: Kamal K. Das, Xiaoxiao Zhang, Mutlu Karakelle, Xin Hong