Multifocal ophthalmic lens
First Claim
1. A diffractive multifocal intraocular lens comprising:
- a first surface and a second surface, said second surface opposes said first surface, said first surface having a first shape and said second surface having a second shape;
where said first surface includes a diffractive pattern imposed on said first shape;
wherein said intraocular lens provides a base focus and an additional focus, the base focus associated with a far viewing distance and far aberration characteristics, the additional focus comprising the base focus adjusted with a diffractive power of the diffractive pattern, the additional focus associated with a near viewing distance and near aberration characteristics;
the near aberration characteristics of the intraocular lens and the far aberration characteristics of the intraocular lens each comprising a negative spherical aberration defined by at least one of said first shape and said second shape such that when the intraocular lens is in the context of an eye, the eye having a cornea with near aberrations associated with the near viewing distance and far aberrations associated with the far viewing distance, the far aberrations being different than the near aberrations, the intraocular lens mitigates;
a far positive spherical aberration of a wavefront induced by transmitting visible light at 50 cycles/mm from the far viewing distance and through the cornea, when the wavefront is passing through said intraocular lens, so as to provide a far modulation transfer function (MTF), anda near positive spherical aberration of a near wavefront induced by transmitting visible light at 50 cycles/mm from the near viewing distance and through the cornea, when the near wavefront is passing through said intraocular lens, so as to provide a near MTF,a sum of the far MTF and the near MTF being above 0.5.
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Accused Products
Abstract
A method of designing a multifocal ophthalmic lens with one base focus and at least one additional focus, capable of reducing aberrations of the eye for at least one of the foci after its implantation, comprising the steps of: (i) characterizing at least one corneal surface as a mathematical model; (ii) calculating the resulting aberrations of said corneal surface(s) by employing said mathematical model; (iii) modelling the multifocal ophthalmic lens such that a wavefront arriving from an optical system comprising said lens and said at least one corneal surface obtains reduced aberrations for at least one of the foci. There is also disclosed a method of selecting a multifocal intraocular lens, a method of designing a multifocal ophthalmic lens based on corneal data from a group of patients, and a multifocal ophthalmic lens.
166 Citations
32 Claims
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1. A diffractive multifocal intraocular lens comprising:
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a first surface and a second surface, said second surface opposes said first surface, said first surface having a first shape and said second surface having a second shape; where said first surface includes a diffractive pattern imposed on said first shape; wherein said intraocular lens provides a base focus and an additional focus, the base focus associated with a far viewing distance and far aberration characteristics, the additional focus comprising the base focus adjusted with a diffractive power of the diffractive pattern, the additional focus associated with a near viewing distance and near aberration characteristics; the near aberration characteristics of the intraocular lens and the far aberration characteristics of the intraocular lens each comprising a negative spherical aberration defined by at least one of said first shape and said second shape such that when the intraocular lens is in the context of an eye, the eye having a cornea with near aberrations associated with the near viewing distance and far aberrations associated with the far viewing distance, the far aberrations being different than the near aberrations, the intraocular lens mitigates; a far positive spherical aberration of a wavefront induced by transmitting visible light at 50 cycles/mm from the far viewing distance and through the cornea, when the wavefront is passing through said intraocular lens, so as to provide a far modulation transfer function (MTF), and a near positive spherical aberration of a near wavefront induced by transmitting visible light at 50 cycles/mm from the near viewing distance and through the cornea, when the near wavefront is passing through said intraocular lens, so as to provide a near MTF, a sum of the far MTF and the near MTF being above 0.5. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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Specification