The present invention pertains to a diffractive multi-focal ophthalmic lens, and the purpose is to provide a novel structure and manufacturing method in which improvement in optical characteristics such as halo reduction is obtained. A diffractive multi-focal ophthalmic lens in which a plurality of focal points are set by a diffraction grating comprising a blaze shaped phase function in which a plurality of zone sequences are overlapped, wherein adopted is a structure expressed by a phase function in which an inclination of a blaze of a specific adjustment zone in a standard profile is reversed.

An implantable lens device has a diffractive surface defining an optical axis. The diffractive surface comprises a relief pattern extending concentrically on the surface and having a sequence of annular concentric steps characterized by alternating heights, wherein an innermost step of the relief pattern has a largest height among all other steps.

An intraocular lens (100) is provided. The intraocular lens (100) includes an anterior surface (102) and a posterior surface (104). The posterior surface (104) defines a plurality of circular bands (114). Each circular band (114) is offset from its adjacent circular band (114) along a longitudinal axis (106) of the intraocular lens (100), wherein a surface (120) extends along the longitudinal axis (106) between peripheries of adjacent circular bands (114).

The invention relates to a multifocal lens (1), in particular an intraocular lens or contact lens, having a refractive focus (F.sub.r) and a first and a second diffractive structure (6, 7) that at least partially overlap, said two diffractive structures (6, 7) being different. A first order focus (F.sub.1;1) of the first diffractive structure (6) coincides with a first order focus (F.sub.2,1) of the second diffractive structure (7). The invention further relates to a method for producing such a multifocal lens (1).

A diffractive multifocal lens is disclosed, comprising an optical element having at least one diffractive surface, the surface profile comprising a plurality of annular concentric zones. The optical thickness of the surface profile changes monotonically with radius within each zone, while a distinct step in optical thickness at the junction between adjacent zones defines a step height. The step heights for respective zones may differ from one zone to another periodically so as to tailor diffraction order efficiencies of the optical element. In one example of a trifocal lens, step heights alternate between two values, the even-numbered step heights being lower than the odd-numbered step heights. By plotting a topographical representation of the diffraction efficiencies resulting from such a surface profile, step heights may be optimized to direct a desired level of light power into the diffraction orders corresponding to near, intermediate, and distance vision, thereby optimizing the performance of the multifocal lens.

A method and system provide an ophthalmic device. The ophthalmic device includes an ophthalmic lens having anterior surface, a posterior surface and at least one diffractive structure including a plurality of zones. The at least one diffractive structure is for at least one of the anterior surface and the posterior surface. Each zone includes at least one echelette having a least one step height. The step height(s) are individually optimized for each zone. To compensate chromatic aberration of eye from distance to a range of vision, a greater than 2? phase step height may be employed and the step height(s) folded by a phase, which is an integer multiple of two multiplied by ?. Hence chromatic aberration of eye may be compensated to improve vision from distance to near.

A multifocal IOL including at least one diffractive surface including a plurality of discrete, adjacent, diffractive, concentric rings, having a radial phase profile cross-section with a near-symmetrical diffractive surface topography, and an odd number, greater than three, of diffractive orders and an asymmetrical distribution of energy flux over the diffractive orders.

An accommodating intraocular lens assembly can include a first lens, a first stanchion, a second lens, and a second stanchion. The first lens can have a first anterior side and a first posterior side. The first stanchion can have a first distal end connected to the first lens and a first base end. The second lens can have a second anterior side and a second posterior side. The second stanchion can have a second distal end connected to the second lens and a second base end. The first lens and the second lens can move laterally relative to one another during contraction of the ciliary muscle in a vertically-extending plane containing the optic axis of the eye and substantially centered in the eye.

A method and system provide a multifocal ophthalmic device. The ophthalmic lens has an anterior surface, a posterior surface and at least one diffractive structure including a plurality of echelettes. The echelettes have at least one step height of at least one wavelength and not more than two wavelengths in optical path length. The diffractive structure(s) reside on at least one of the anterior surface and the posterior surface. The diffractive structure(s) provide a plurality of focal lengths for the ophthalmic lens.

An intraocular lens configured to reduce or eliminate oblique incident light photic disturbances in the eye, said lens comprising anterior and posterior surfaces defining a central lens optic extending from said anterior to said posterior surfaces and a peripheral portion outside of the central lens optic, wherein the peripheral portion is a prismatic lens which redirects oblique incident light on the peripheral portion forward of the nasal retina in the eye and onto the ciliary body/pars plana region.