Toric small aperture intraocular lens with extended depth of focus

Abstract

An intraocular lens is provided that includes a refractive element and a mask. The refractive element has a first power in a first meridian and a second power greater than the first power in a second meridian. A magnitude of the first and second powers and a location of the first and second meridians are configured to correct astigmatism in a human eye. The mask is configured to block a substantial portion of light from passing through an annular region thereof and to permit a substantial portion of light to pass through a central aperture thereof to enhance an astigmatism correction rotational misplacement range and depth of focus.

1 .- 16 . (canceled) 
     
     
         17 . An intraocular lens comprising:
 a refractive element comprising a first power in a first meridian and a second power greater than the first power in a second meridian, a magnitude of the first and second powers and a location of the first and second meridians configured to correct astigmatism in a human eye; and   a mask configured to block a substantial portion of light from passing through an annular region thereof and to permit a substantial portion of light to pass through a central aperture thereof to enhance an astigmatism correction rotational misplacement range,   wherein the intraocular lens is configured to maintain a same visual acuity level from 0 to +/−1.5 diopters of cylinder.   
     
     
         18 . The intraocular lens of  claim 17 , wherein the mask is placed on a face of an optic comprising the refractive element. 
     
     
         19 . The intraocular lens of  claim 18 , wherein the mask is formed on a piggyback element configured to place the mask on the face of the optic. 
     
     
         20 . The intraocular lens of  claim 17 , wherein the mask is embedded in an optic comprising the refractive element. 
     
     
         21 . The intraocular lens of  claim 17 , wherein the mask comprises an aperture of less than about 2.8 mm. 
     
     
         22 . The intraocular lens of  claim 17 , wherein the mask comprises a plurality of small holes disposed through the annular region to secure the mask to an optic comprising the refractive element. 
     
     
         23 . The intraocular lens of  claim 17 , wherein the mask is configured to increase depth of focus by a magnitude equivalent to up to 2 diopters of add power. 
     
     
         24 . The intraocular lens of  claim 17 , wherein the mask comprises an elastic material. 
     
     
         25 . An intraocular lens comprising:
 a refractive element comprising a first power in a first meridian and a second power greater than the first power in a second meridian, a magnitude of the first and second powers and a location of the first and second meridians configured to correct astigmatism in a human eye; and   a mask configured to block a substantial portion of light from passing through an annular region thereof and to permit a substantial portion of light to pass through a central aperture thereof to enhance an astigmatism correction rotational misplacement range,   wherein the intraocular lens is configured to maintain visual acuity of at least 20/20 from 0.0 diopters to +/−2.0 diopters of defocus.   
     
     
         26 . The intraocular lens of  claim 25 , wherein the mask is placed on a face of an optic comprising the refractive element. 
     
     
         27 . The intraocular lens of  claim 26 , wherein the mask is formed on a piggyback element configured to place the mask on the face of the optic. 
     
     
         28 . The intraocular lens of  claim 25 , wherein the mask is embedded in an optic comprising the refractive element. 
     
     
         29 . The intraocular lens of  claim 25 , wherein the mask comprises an aperture of less than about 2.8 mm. 
     
     
         30 . The intraocular lens of  claim 25 , wherein the mask comprises a plurality of small holes disposed through the annular region to secure the mask to an optic comprising the refractive element. 
     
     
         31 . The intraocular lens of  claim 25 , wherein the mask is configured to increase depth of focus by a magnitude equivalent to up to 2 diopters of add power. 
     
     
         32 . The intraocular lens of  claim 25 , wherein the mask comprises an elastic material. 
     
     
         33 . A method of correcting astigmatism comprising:
 placing an intraocular lens into an eye of a patient, the intraocular lens comprising a cylinder power component aligned with a meridian thereof and a mask comprising a small aperture surrounded by an opaque member;   confirming the meridian of the intraocular lens is aligned within a range exceeding five degrees of a pre-operatively defined rotational position; and   confirming the eye achieves functional acuity.   
     
     
         34 . The method of  claim 33 , wherein the range extends from within 5 degrees to within 15 degrees. 
     
     
         35 . The method of  claim 33 , further comprising confirming visual acuity is at least 20/20.