30 results about "Posterior lens" patented technology

An intraocular lens having an anterior lens member (48) presenting an anterior light-converging optic (52) and a posterior lens member (50) presenting a posterior light-diverging optic (68) for magnifying an observed image onto large regions of the retina (32) to permit central focus in patients suffering from AMD and a method of implanting the lens into the human eye (10). The anterior light-converging optic (52) is operably coupled with a flexible body (58) which extends radially therefrom and presents opposing bights (62) presenting termini (66) when the lens is viewed in cross-section. The posterior light-diverging optic (68) is operably coupled with an annular flange (76) which is arcuate in cross-section and mates with termini. Both the anterior and the posterior lens members (48, 50) have positioning holes (70, 80) formed therein permitting surgical implantation thereof. The IOL (46) is constructed of a flexible synthetic resin material such as polymethylmethacrylate and permits focusing upon objects located near to and far from the viewer.

The invention relates to a multi-lens intraocular lens system having an accommodation material between the lenses. The system comprises an posterior lens attached to the posterior surface of the capsular bag and an anterior lens attached to the anterior surface of the capsular bag. The anterior and posterior lenses have different optical properties providing different degrees and types of correction. An accommodation material is place between the anterior and posterior lenses. The accommodation material may comprise of one or more macromers, which, when polymerized, adjust the properties of the accommodation material.

The invention relates to a multi-lens intraoccular lens system having an accommodation material between the lenses. The system comprises an posterior lens attached to the posterior surface of the capsular bag and an anterior lens attached to the anterior surface of the capsular bag. The anterior and posterior lenses have different optical properties providing different degrees and types of correction. An accommodation material is placed between the anterior and posterior lenses. The accommodation material ma comprise of one or more macromers, which, when polymerized, adjust the properties of the accommodation material.

The invention relates to a intraocular lens system having a flexible anterior lens accommodation material behind the lens. The accommodation material may comprise of one or more macromers, which, when polymerized, adjust the properties of the accommodation material. The anterior lens is flexible such that the curvature of the lens changes during accommodation. The anterior lens may be used alone or in combination with a posterior lens.

An intraocular lens, with equal conic surfaces, is intended to replace the crystalline lens in the posterior chamber of a patient's eye, in particular after a cataract extraction. The lens provides optical power to focus objects onto a patient's retina. In addition the lens surfaces are shaped to reduce optical aberrations at the retina and are tolerant to lens tilt and decentration within the eye. The lens is designed to have zero longitudinal ray aberrations at a specific ray height.

Methods and apparatus are provided for optical coherence metrology or tomography across an extended area of an eye with improved registration. At least two optical coherence tomograms are acquired, with each tomogram containing data from regions of an anterior surface of the eye that are at least partially overlapping, and data from one or more deeper structures such as the retina or the anterior or posterior lens surfaces. The tomograms are then processed to register the data from the overlapping portions of the anterior surface regions, thereby registering the data from the deeper structures. In certain embodiments the reference arm of the apparatus comprises a compound reflector having at least two axially separated reflective surfaces for applying differential delays to different portions of the reference beam. The depth of field of the apparatus is thereby extended to enable measurement of eye length. In certain embodiments eye length measurements at a number of angles of incidence provide information on total eye shape.

Postoperative lens position is predicted on the basis of known measured values, such as the corneal thickness, the depth of the anterior chamber, the eye length, and the distances of the capsular bag equator and / or of the lens haptic from the anterior surface of the lens. In addition, the calculation also takes into account the attitude of the intraocular lens, for which purpose additional parameters of the pseudophakic eye are used that have not previously been taken into consideration.; The proposed method is suitable for a more exact prediction of the strength and nature of an intraocular lens to be implanted in a pseudophakic eye in the context of cataract surgery or of a refractive intervention. The method is based on the use of suitable calculation methods, e.g. geometric optical formulae, or of ray tracing.

A multi-element IOL, comprising an anterior lens element comprising a light-adjustable material responsive to light of a first wavelength, and a posterior lens element comprising a light blocker capable of blocking light of the first wavelength, and a method of inserting the multi-element IOL.

An intraocular lens (31) which may be used as a posterior lens in a lens train including a converging anterior lens (20) and diverging posterior lens (31) in which the optical / focal axes of the two lenses are not coincident such that the focal point (9) of the lens train is offset from the focal axis of the anterior lens. Light rays (50) incident upon the anterior lens parallel to its focal axis may thus be directed (51) to parts of the retina offset from the fovea where the macula may not have degenerated.

An ophthalmologic lens assembly includes a glass prism bonded to a meniscus lens at a posterior end of the glass prism. The glass prism is surrounded by a housing that is bonded to the meniscus lens. In one embodiment, the housing and a meniscus lens blank are processed by grinding and polishing the housing and meniscus lens blank together to form a posterior lens surface of a meniscus contact lens. In other embodiment, only the meniscus lens blank is processed by grinding and polishing to form a posterior lens surface of a meniscus contact lens.

Bifurcated haptic aligner actuators (BHAAs) have an anterior and a posterior lens support ring to each of which is pivotively attached a plurality of center-pivoted struts, at least two of which comprise an opposing pair, and to each of the opposing pair of struts is pivotably attached a bifurcated haptic, one haptic branch being pivotably attached to the anterior part of a strut, the other branch of the same haptic being similarly attached to the posterior part of the same strut.

An intraocular lens system comprising at least one intraocular lens having an anterior surface and a posterior surface, wherein at least one surface of the lens is aspherical to provide for a continuum of retinal images to be focused at the retina in an area between two retinal eccentricities. The system may include an anterior light-converging intraocular lens 16 for positioning within the eye, the anterior lens having an anterior surface and a posterior surface; and a posterior light-diverging intraocular lens 17 for positioning within the eye posterior to the anterior lens, the posterior lens having an anterior surface and a posterior surface; wherein one or both surfaces of the anterior lens and / or one or both surfaces of the posterior lens are aspherical.

Bifurcated haptic aligner actuators (BHAAs) have an anterior and a posterior lens support ring to each of which is pivotively attached a plurality of center-pivoted struts, at least two of which comprise an opposing pair, and to each of the opposing pair of struts is pivotably attached a bifurcated haptic, one haptic branch being pivotably attached to the anterior part of a strut, the other branch of the same haptic being similarly attached to the posterior part of the same strut.

The zoom lens is a retractable bent-type zoom lens capable of providing a high zoom ratio and a reduced thickness, and capable of retracting into a camera body with an easily-configured mechanism. The zoom lens includes in order from an object side to an image side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a prism including a reflective surface, and a posterior lens group which includes plural lens units and has as a whole a positive refractive power. The first and second lens units are retractable into a space formed by movement of the prism in a direction orthogonal to an optical axis of the first lens unit, and, during zooming, the second lens unit and the plural lens units in the posterior lens group are moved while the first lens unit and the prism are fixed.

An intraocular lens system comprising at least one intraocular lens having an anterior surface and a posterior surface, wherein at least one surface of the lens is aspherical to provide for a continuum of retinal images to be focused at the retina in an area between two retinal eccentricities. The system may include an anterior light-converging intraocular lens (16) for positioning within the eye, the anterior lens having an anterior surface and a posterior surface; and a posterior light-diverging intraocular lens (17) for positioning within the eye posterior to the anterior lens, the posterior lens having an anterior surface and a posterior surface; wherein one or both surfaces of the anterior lens and / or one or both surfaces of the posterior lens are aspherical.

An intraocular lens (31) which may be used as a posterior lens in a lens train including a converging anterior lens (20) and diverging posterior lens (31) in which the optical / focal axes of the two lenses are not coincident such that the focal point (9) of the lens train is offset from the focal axis of the anterior lens. Light rays (50) incident upon the anterior lens parallel to its focal axis may thus be directed (51) to parts of the retina offset from the fovea where the macula may not have degenerated.

A method of generating three dimensional shapes for a cornea and lens of an eye, the method including illuminating an eye with multiple sections of light and obtaining multiple sectional images of said eye based on said multiple sections of light. For each one of the obtained multiple sectional images, the following processes are performed:a) automatically identifying arcs, in two-dimensional space, corresponding to anterior and posterior corneal and lens surfaces of the eye by image analysis and curve fitting of the one of the obtained multiple sectional images; andb) determining an intersection of lines ray traced back from the identified arcs in two-dimensional space with a known position of a section of space containing the section of light that generated the one of the obtained multiple sectional images, wherein the determined intersection defines a three-dimensional arc curve. The method further including reconstructing three-dimensional shapes of the anterior and posterior cornea surfaces and the anterior and posterior lens surfaces based on fitting the three-dimensional arc curve to a three-dimensional shape.

The invention provides a method for predicting an effective position of an artificial crystalline lens. By virtue of the method, the effective position of the postoperative crystalline lens can be effectively predicted. The method for predicting the effective position of the artificial crystalline lens comprises the following steps: (1) acquiring eye parameters, wherein the eye parameters includeciliary body parameters and suspensory ligament parameters; (2) carrying out correlation analysis on the eye parameters and an eye pouch shrinkage factor, and establishing a parameter correlation equation for the eye pouch shrinkage factor and the eye parameters; and (3) establishing an ELP model according to the eye pouch shrinkage factor, so as to predict the effective position of the artificialcrystalline lens. Preferably, the eye parameters acquired in the step (1) further include anterior chamber parameters and crystalline lens parameters. Preferably, the suspensory ligament parameters in the step (1) include suspensory ligament looseness.

The invention provides a compact 2X high-definition zoom glass-plastic lens, comprising a lens cone. The lens cone comprises an anterior lens A, a posterior lens B and an aperture C that are successively arranged from left to right along incident light. The anterior lens A comprises a first meniscus lens A, a biconcave lens A, and a second meniscus lens A that are successively arranged from left to right along incident light. The posterior lens B comprises a biconvex lens B, a first aspherical lens, a second aspherical lens, a first meniscus lens B and a second meniscus lens B that are successively arranged from left to right along incident light. The compact 2X high-definition zoom glass-plastic lens of the invention is reasonable in design, and achieves a high-definition camera level with an ultra-low cost by using a plastic aspherical surface, realizes 2x zooming and reasonable distribution of focal power, and can still obtain a perfect image in a harsh environment at different temperatures. By ingeniously arranging the position of the aspherical surface, the zoom lens with an ultra-small structure is achieved, so that the lens is practical.

A method and mold assembly to control the polymerization of a molded article. In one embodiment, an amorphous posterior mold comprising a non-critical surface having a controlled radius of curvature is used to produce molded articles. In an alternate embodiment, ophthalmic lenses are produced using a posterior mold in which the concave surface of the non-critical surface is filled with a liquid having a similar refractive index as the mold material. In still another embodiment, a positive lens is placed at a predetermined distance adjacent to the mold assembly to alter the irradiation path to the mold assembly. In still another embodiment, a positive lens is placed within the concave surface of the posterior lens.

An intraocular lens system comprising at least one intraocular lens having an anterior surface and a posterior surface, wherein at least one surface of the lens is aspherical to provide for a continuum of retinal images to be focused at the retina in an area between two retinal eccentricities. The system may include an anterior light-converging intraocular lens 16 for positioning within the eye, the anterior lens having an anterior surface and a posterior surface; and a posterior light-diverging intraocular lens 17 for positioning within the eye posterior to the anterior lens, the posterior lens having an anterior surface and a posterior surface; wherein one or both surfaces of the anterior lens and / or one or both surfaces of the posterior lens are aspherical.

A method of generating three dimensional shapes for a cornea and lens of an eye, the method including illuminating an eye with multiple sections of light and obtaining multiple sectional images of said eye based on said multiple sections of light. For each one of the obtained multiple sectional images, the following processes are performed:a) automatically identifying arcs, in two-dimensional space, corresponding to anterior and posterior corneal and lens surfaces of the eye by image analysis and curve fitting of the one of the obtained multiple sectional images; andb) determining an intersection of lines ray traced back from the identified arcs in two-dimensional space with a known position of a section of space containing the section of light that generated the one of the obtained multiple sectional images, wherein the determined intersection defines a three-dimensional arc curve. The method further including reconstructing three-dimensional shapes of the anterior and posterior cornea surfaces and the anterior and posterior lens surfaces based on fitting the three-dimensional arc curve to a three-dimensional shape.