Multifocal ophthalmic lens
First Claim
1. 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.
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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.
316 Citations
174 Claims
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1. 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:
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(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. - 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, 33, 34, 35, 36, 37, 38, 39, 48, 77, 102, 150, 151, 152, 153, 154, 155)
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40. A method of selecting a multifocal intraocular lens that is capable of reducing aberrations of the eye for at least one of the foci after its implantation comprising the steps of:
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(i) characterizing at least one corneal surface as a mathematical model;
(ii) calculating the resulting aberrations of said corneal surfaces(s) by employing said mathematical model;
(iii) selecting an intraocular lens having a suitable configuration of optical powers from a plurality of lenses having the same power configurations, but different aberrations;
(iv) determining if an optical system comprising said selected lens and corneal model sufficiently reduces the aberrations. - View Dependent Claims (41, 42, 43, 44, 45, 46, 47, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 78, 79, 80)
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81. A method of designing a multifocal ophthalmic lens suitable for implantation into the eye, characterized by the steps of:
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selecting a representative group of patients;
collecting corneal topographic data for each subject in the group;
transferring said data to terms representing the corneal surface shape of each subject for a preset aperture size;
calculating a mean value of at least one corneal surface shape term of said group, so as to obtain at least one mean corneal surface shape term and/or calculating a mean value of at least one to the cornea corresponding corneal wavefront aberration term, each corneal wavefront aberration term being obtained by transforming corresponding through corneal surface shape terms;
from said at least one mean corneal surface shape term or from said at least one mean corneal wavefront aberration term designing a multifocal ophthalmic lens capable of reducing said at least one mean wavefront aberration term of the optical system comprising cornea and lens for at least one of the foci. - View Dependent Claims (82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101)
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- 103. A multifocal ophthalmic lens with one base focus and at least one additional focus, characterized in that the shape of the lens is modelled such that the resulting aberrations are reduced for at least one of the foci in an optical system comprising said multifocal lens and a model cornea having aberration terms, or being without aberration terms.
- 160. A multifocal ophthalmic lens having at least one nonspherical surface which when expressed as a linear combination of polynomial terms representing its aberrations is capable of reducing similar such aberration terms obtained in a wavefront having passed the cornea, thereby obtaining an eye sufficiently free from aberrations.
Specification