摘要:
A two optic accommodative lens system wherein at least one of the optics is deformable. When compressed by the capsular bag, the two optics press against each other, deforming at least one of the optics. As a result, the interface where the two optics meet changes shape, thereby altering the refractive power of the lens system.
摘要:
In one- aspect, the invention provides an intraocular lens (IOL) (10) that includes an optic (12) and a peripheral optical flange (14) that surrounds the optic. The optic can form an image of a field of view on the IOL user's retina and the peripheral flange can inhibit dysphotopsia. By way of example, the peripheral flange can include at least one textured surface that is adapted to receive peripheral light rays entering the eye at large visual angles so as to cause their scattering in order to inhibit dysphotopsia, e.g., by preventing the formation of a secondary peripheral image or scattering some light to a shadow region between such a secondary image and an image formed by the IOL.
摘要:
A method of calculating the required cylindrical power of a toric implant by using both the measured pre-operative corneal/ocular astigmatism and the predicted surgically-induced astigmatism. The post-operative corneal/ocular astigmatism is predicted using power vector analysis of the surgical technique employed by the surgeon. Such a method provides a more accurate method of calculating the required spherocylindrical refractive power of the implant. The method can be implemented manually, but preferably is automated by implementation on a computer through appropriate software.
摘要:
The present invention provides an ophthalmic lens (10,22) including an intraocular lens (TOL) comprising an optic (12) having an anterior surface (14,26) and a posterior surface (16,24), said optic exhibiting a shape factor, defined as a ratio of the sum of the anterior and posterior curvatures to the difference of such curvatures, in a range of - 0.5 to 4. The optic is formed entirely from at least one solid biocompatible material.
摘要:
In one aspect, the present invention provides an intraocular lens (IOL), which comprises at least two optics disposed in tandem along an optical axis, and an accommodative mechanism that is coupled to at least one of the optics and is adapted to adjust a combined optical power of the optics in response to natural accommodative forces of an eye in which the optics are implanted so as to provide accommodation. At least one of the optics has a surface characterized by a first refractive region, a second refractive region and transition region therebetween, where an optical phase shift of incident light having a design wavelength (e.g., 550 nm) across the transition region corresponds to a non-integer fraction of that wavelength.
摘要:
A method of calculating the required cylindrical power of a toric implant by using both the measured pre-operative corneal/ocular astigmatism and the predicted surgically-induced astigmatism. The post-operative corneal/ocular astigmatism is predicted using power vector analysis of the surgical technique employed by the surgeon. Such a method provides a more accurate method of calculating the required spherocylindrical refractive power of the implant. The method can be implemented manually, but preferably is automated by implementation on a computer through appropriate software.
摘要:
There is provided an intraocular lens, comprising an optic having an anterior surface and a posterior surface disposed about an optical axis, at least one of said surfaces having a profile characterized by superposition of a base profile, the base profile having a base curvature corresponding to a nominal optical power of the lens, and an auxiliary profile, the superposition of the base profile and the auxiliary profile defining a surface comprising an inner refractive region, an outer refractive region and a transition region extending from an outer radial boundary of the inner refractive region to an inner radial boundary of the outer refractive region. The inner refractive region has the base curvature corresponding to the nominal optical power corresponding to a nominal focal plane, the outer refractive region has the base curvature corresponding to the nominal optical power, the transition region (22) is adapted to provide a monotonic change in the optical path difference relative to said outer radial boundary of the inner refractive region (18) as a function of increasing radial distance from the optical axis and wherein the transition region is configured such that an optical phase shift of incident light having a design wavelength across said transition region is defined as: Phase Shift = 2 π λ OPD , in which OPD = the optical phase difference, and λ designates the design wavelength, which is about 550 nm. So that a first portion of an incoming wavefront in the first refractive region and a second portion of the incoming wavefront in the second refractive region converge in front of or beyond the nominal focal plane.
摘要:
The present invention provides an ophthalmic lens (10,22) including an intraocular lens (TOL) comprising an optic (12) having an anterior surface (14,26) and a posterior surface (16,24), said optic exhibiting a shape factor, defined as a ratio of the sum of the anterior and posterior curvatures to the difference of such curvatures, in a range of - 0.5 to 4. The optic is formed entirely from at least one solid biocompatible material.
摘要:
The present invention provides an ophthalmic lens (10,22) including an intraocular lens (TOL) comprising an optic (12) having an anterior surface (14,26) and a posterior surface (16,24), said optic exhibiting a shape factor, defined as a ratio of the sum of the anterior and posterior curvatures to the difference of such curvatures, in a range of - 0.5 to 4. The optic is formed entirely from at least one solid biocompatible material.
摘要:
The present invention provides an ophthalmic lens (10,22) including an intraocular lens (TOL) comprising an optic (12) having an anterior surface (14,26) and a posterior surface (16,24), said optic exhibiting a shape factor, defined as a ratio of the sum of the anterior and posterior curvatures to the difference of such curvatures, in a range of - 0.5 to 4. The optic is formed entirely from at least one solid biocompatible material.