Toric lens with decreased sensitivity to cylinder power and rotation and method of using the same

Abstract

A method, system and apparatus for vision correction are disclosed. The method, system and apparatus include a toric intraocular element for correcting astigmatism and having a cylinder power, and a depth of focus extender coupled to the toric intraocular element, the depth of focus extender extending a depth of focus. The extended depth of focus may reduce sensitivity of the toric intraocular element to at least one of rotation and selected cylinder power.

1 . A method for decreasing sensitivity of astigmatic correction to errors of cylinder power selection and lens rotational alignment, comprising:
 receiving a measure of astigmatism;   receiving a selection of a toric lens to reduce the astigmatism;   receiving a determination of a depth of focus extension for coupling with the selected toric lens;   coupling the determined depth of focus extension and the selected toric lens;   inserting the coupled depth of focus extension and the selected toric lens in a line of sight.   
     
     
         2 . The method of  claim 1 , further comprising receiving historic information about residual astigmatism. 
     
     
         3 . The method of  claim 1 , wherein said inserting comprises implanting. 
     
     
         4 . The method of  claim 1 , wherein said inserting comprises providing a contact lens. 
     
     
         5 . The method of  claim 1 , wherein said inserting comprises surgical corneal modification. 
     
     
         6 . The method of  claim 1 , wherein said inserting comprises a combination of implanting and surgical corneal modification. 
     
     
         7 . The method of  claim 1 , wherein said inserting comprises providing prescription glasses. 
     
     
         8 . A method of design of an optical element for decreasing the sensitivity of astigmatic correction to errors of cylinder power selection and lens rotational alignment, said method comprising:
 measuring astigmatism to be corrected;   selecting a toric lens suitable for correcting said measured astigmatism;   determining an extended depth of focus to provide at least a tolerance of the decrease of the sensitivity based on the selected toric lens and average rotational alignment; and   designing an element having the determined extended depth of focus element for coupling with said toric element.