Phakic intraocular lens

Abstract

The present invention is a phakic intraocular lens for implantation between an iris and a crystalline lens. The phakic intraocular lens includes a diffraction grating 5 disposed in a lens central part 2 and having circular, coaxial grooves formed thereon, and a support part 3 disposed outside the diffraction grating 5 and supporting the diffraction grating 5. A hole 6 is formed in the center of the diffraction grating 5.

1 . A phakic intraocular lens for implantation between an iris and a crystalline lens, comprising:
 a diffraction grating that is disposed in a central part of the lens and has circular, coaxial grooves formed thereon; and   a support part that is disposed outside the diffraction grating and supports the diffraction grating, wherein   a hole is formed in a center of the diffraction grating.   
     
     
         2 . The phakic intraocular lens according to  claim 1 , wherein
 the hole is 0.25 mm to 0.5 mm in diameter.   
     
     
         3 . The phakic intraocular lens according to  claim 1 , wherein
 the diffraction grating forms a single focal point by having the grooves which are formed such that the farther an interval of the grooves is from the center of the diffraction grating, the smaller the interval is, the grooves being provided with serrated portions whose height is adjusted to a predetermined value.   
     
     
         4 . The phakic intraocular lens according to  claim 2 , wherein
 the diffraction grating forms a single focal point by having the grooves which are formed such that the farther an interval of the grooves is from the center of the diffraction grating, the smaller the interval is, the grooves being provided with serrated portions whose height is adjusted to a predetermined value.