Systems and methods for correcting power of an intraocular lens using refractive index writing

Abstract

Systems and methods for improving vision of a subject implanted with an intraocular lens (IOL) that has a non-zero residual spherical error that requires an estimated diffractive power addition in the IOL. In some embodiments, a plurality of laser pulses are applied to the IOL, the laser pulses being configured to produce, by refractive index writing on the IOL, the estimated diffractive power addition to correct for the residual spherical error.

1 . A method for improving vision of a subject implanted with an intraocular lens (IOL) that has a non-zero residual spherical error that requires an estimated diffractive power addition in the IOL, the method comprising:
 applying a plurality of laser pulses to the IOL, the laser pulses being configured to produce, by refractive index writing on the IOL, the estimated diffractive power addition to correct for the residual spherical error.   
     
     
         2 . The method of  claim 1 , wherein the power addition is a positive diffractive power addition that at least partially reduces a longitudinal chromatic aberration of the eye. 
     
     
         3 . The method of  claim 1  or  2 , wherein applying the plurality of laser pulses comprises applying a plurality of focused laser pulses according to a predetermined pattern to at least one selected area of the IOL to produce the diffractive power addition. 
     
     
         4 . The method of any one of  claims 1 - 3 , wherein the estimated diffractive power addition fully compensates for the longitudinal chromatic aberration. 
     
     
         5 . The method of any one of  claims 1 - 4 , wherein the diffractive power addition is estimated based at least in part on at least one of:
 estimated IOL power to target emmetropia;   subject's axial length; and   surgeon's optimized A constant; and   effective lens position (ELP).   
     
     
         6 . The method of any one of  claims 1 - 5 , wherein the laser pulses are configured and applied to the IOL such that the power addition does not induce further spherical aberration or modify existing spherical aberration. 
     
     
         7 . The method of  claim 5 , wherein control of the spherical aberration is performed at least in part by changing the phase profile of the IOL by refractive index writing. 
     
     
         8 . The method of  claim 6  or  7 , wherein control of the spherical aberration is performed at least in part by changing, by the refractive index writing on the IOL, the size of diffractive profile zones in r 2  space. 
     
     
         9 . The method of any one of  claims 1 - 8 , wherein a phase profile induced in the IOL to correct for residual errors is calculated based at least in part on effective lens position (ELP) measured during the refractive index writing. 
     
     
         10 . A method for improving vision of a subject implanted with an IOL that has a non-zero residual spherical error, the method comprising:
 applying a plurality of laser pulses to the IOL, the laser pulses being configured to produce, by refractive index writing on the IOL, an estimated positive diffractive power addition, and wherein a phase profile induced in the IOL to correct for residual errors is calculated based at least in part on effective lens position (ELP) measured during the refractive index writing.   
     
     
         11 . The method of  claim 10 , wherein applying the plurality of laser pulses comprises applying a plurality of focused laser pulses to at least one selected area of the IOL to produce, by the refractive index writing on the IOL, the diffractive power addition in the IOL. 
     
     
         12 . The method of  claim 10  or  11 , wherein the diffractive power addition at least partially corrects a longitudinal chromatic aberration of the eye. 
     
     
         13 . The method of any one of  claims 10 - 12 , wherein the diffractive power addition is estimated based at least in part on at least one of:
 estimated IOL power to target emmetropia;   subject's axial length; and   surgeon's optimized A constant.   
     
     
         14 . The method of any one of  claims 9 - 11 , wherein the laser pulses are configured and applied to the IOL such that the power addition does not induce further spherical aberration or modify existing spherical aberration. 
     
     
         15 . The method of any one of  claims 10 - 14 , wherein control of spherical aberration is performed at least in part by changing, by the refractive index writing on the IOL, the size of diffractive profile zones in r 2  space. 
     
     
         16 - 26 . (canceled)