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 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.

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.

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.

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.