| 摘要 |
<p>A supplemental intraocular lens is provided for implantation in the eye to modify the lens system of the eye comprising the cornea and the natural lens or an intraocular lens already implanted in the eye, to create a modified lens system having teledioptic or other diffractive capabilities to correct for macular degeneration. To create the teledioptic lens system, the supplemental intraocular lens has substantially no refractive power except for a high minus lens portion at its center. The supplemental intraocular lens, when implanted on the natural or previously implanted artificial lens in the eye and used without an external lens, allows light rays entering the eye onto the retina of the eye as they would without the supplemental intraocular lens, thus providing unmagnified and peripherally unrestricted vision. When a spectacle lens is placed in front of the cornea, the spectacle lens, cornea, natural or intraocular lens and supplemental intraocular lens provide the eye with magnified and restricted peripheral vision. To create a lens system having other diffractive capabilities, a light diffractive supplemental intraocular lens, such as a prism-shaped intraocular lens, having no refractive power is implanted in the eye. The prism-shaped supplemental intraocular lens, the natural lens or artificial lens already implanted in the eye, and the cornea of the eye create a lens system which redirects the light rays entering the eye onto a portion of the retina away from the macula to create an image unaffected by macula degeneration.</p> |
