Intraocular lens

Abstract

The Invention concerns an intraocular lens with negative spherical aberration and a method of determining the refractive power of intraocular lenses. In the environment of immersion medium the intraocular lens refracts an incoming wave with an elliptically oblongly curved wave front into an outgoing wave with a substantially spherical wave front.

1 . An intraocular lens 
 having a configuration such that, in each an immersion medium environment, an incoming wave with an elliptically oblongly curved wave front is refracted into an outgoing wave with a substantially spherical wave front.    
   
   
       2 . An intraocular lens according to  claim 1 , 
 wherein the lens has a positive refractive power in the environment of immersion medium and a negative spherical aberration.    
   
   
       3 . An intraocular lens according to  claim 2 , 
 wherein the lens has a refractive power at the center of the lens which in the environment of immersion medium is greater than or equal to +3 dpt, and wherein the lens is so configured that, in an air environment, an incoming wave with a substantially plane wave front is refracted into an outgoing wave with a hyperbolic wave front.    
   
   
       4 . An intraocular lens according to  claim 3 . 
 wherein the hyperbolic wave front has an asphericity of less than or equal to −5.    
   
   
       5 . An intraocular lens according to  claim 3 , 
 wherein the lens has at least one convexly curved surface whose curvature has an asphericity of less than or equal to −1.    
   
   
       6 . An intraocular lens according to  claim 1 . 
 wherein the lens has a refractive power at the center of the lens which in the immersion medium environment is at most +2 dpt and at least −1 dpt, and wherein the lens is so configured that an incoming wave with a substantially plane wave front is refracted into an outgoing wave whose apex surface has a meridian with an inflexion point.    
   
   
       7 . An intraocular lens according to  claim 1 , 
 wherein the lens has a refractive power at the center of the lens which in the immersion medium environment is less than or equal to −2 dpt, and wherein the lens is so configured that an incoming wave with a substantially plane wave front is refracted into an outgoing wave with an elliptically oblongly curved wave front whose aspericity measured in air is greater than +10.    
   
   
       8 . A method of determining imaging properties of an intraocular lens, comprising: 
 producing a parallel light beam,    orienting the light beam on to the intraocular lens,    breaking the light beam refracted by the intraocular lens down into a plurality of focused beams via a lens arrangement, and    detecting the local distribution of the focus beams focused by the lens arrangement.    
   
   
       9 . An intraocular lens according to  claim 5 , wherein the hyperbolic wave front has an asphericity of less than or equal to −5.