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Intraocular lens

A technology of intraocular lenses and lenses, applied in the direction of intraocular lenses, eye implants, etc., can solve problems such as optical aberrations and undesired optical effects

Inactive Publication Date: 2012-09-26
RAYNER INTRAOCULAR LENSES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, although a lens of the type disclosed in WO03 / 047466 provides a compact means of achieving the desired deflection of light, it leads to some undesirable optical effects, including optical aberrations

Method used

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  • Intraocular lens
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Embodiment Construction

[0062] The invention will now be described, by way of example only, with reference to the accompanying drawings. figure 1 Substantially half of a conventional lens 10 is comprised, having a curved surface 11 and an opposing surface 12 in the form of a Fresnel prism. A Fresnel prism is essentially a linear array of prismatic elements with a constant profile in one direction and a modulating profile in an orthogonal direction. Such as figure 1 As shown in , the modulation of the Fresnel prism surface can take the form of a sawtooth, with each prism element having one facet substantially parallel to the optical axis of the lens and one facet angled relative to the optical axis.

[0063] Figure 2A and 2B is shown by placing within a schematic eye 20 figure 1 Rays 24 traced by a Fresnel prism intraocular lens 21 of the type shown in , and the optical aberrations caused by the prism intraocular lens are shown. The IOL shown includes a spherical lens surface (the surface facing...

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PUM

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Abstract

An intraocular lens is described which comprises, as one face (21, 145) thereof, a linear Fresnel prism array with facets angled relative to the optical axis of the lens so as to deviate light incident thereon to an off-axis position. The facets are modified so as to reduce at least one of diffraction effects and astigmatism associated with the Fresnel prism. In particular, by varying the pitch (x1,..., xn) of the prism elements across the array, which may comprise varying their size, a diffraction grating effect can be reduced or negated, such that light is not diffracted into undesirable orders and multiple images can be avoided. Furthermore, chromatic angular dispersion associated with the diffraction grating effect may be reduced. The pitch variation can be random. By varying the angle of the facets across the array, astigmatism that would otherwise result from the presence of the Fresnel prism can also be compensated.

Description

technical field [0001] The present invention relates to intraocular lenses (IOLs), and more particularly to improved IOLs with Fresnel prisms, which can be used to reduce the effects of age-related macular degeneration (ARMD). Background technique [0002] The treatment of focal macular diseases (especially ARMD) is a big problem. Since an intact macula provides vision needed for reading, driving, etc. (but not peripheral vision), the fact that there is no effective treatment for macular degeneration means that many people will gradually retain only peripheral vision. [0003] To solve this problem, it has been proposed that the retina should be surgically repositioned in the eye. A more feasible solution would be to optically shift the image of the point of gaze from the macula to the point on the retina where healthy cells are present. Although these cells may not work as well as macular cells, a sufficient degree of vision can be preserved. [0004] This method is prop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61F2/16
CPCA61F2/1656A61F2/16
Inventor D·普尔彻斯P·托普
Owner RAYNER INTRAOCULAR LENSES