Conformable therapeutic shield for vision and pain

Abstract

A conformable covering comprises an outer portion with rigidity to resist movement on the cornea and an inner portion to contact the cornea and provide an environment for epithelial regeneration. The inner portion of the covering can be configured in many ways so as to conform at least partially to an ablated stromal surface so as to correct vision. The conformable inner portion may have at least some rigidity so as to smooth the epithelium such that the epithelium regenerates rapidly and is guided with the covering so as to form a smooth layer for vision. The inner portion may comprise an amount of rigidity within a range from about 1×10-4 Pa*m3 to about 5×10-4 Pa*m3 so as to deflect and conform at least partially to the ablated cornea and smooth an inner portion of the ablation with an amount of pressure when deflected.

1 . (canceled) 
     
     
         2 . A covering for an eye of a patient, the eye comprising a cornea having an optical portion, wherein the covering comprises:
 an inner portion having an inner rigidity and at least one inner radius of curvature; and   an outer portion having an outer rigidity and at least one outer radius of curvature;   wherein the inner rigidity is greater than the outer rigidity; and   wherein the covering, when applied to the eye, is configured to flex, with the inner portion configured to at least partially conform to the cornea and to provide a chamber between the inner portion and the cornea, and with the outer portion configured to engage the eye.   
     
     
         3 . The covering of  claim 2 , wherein the outer portion is configured to provide engagement with the eye sufficient to resist movement of the inner portion relative to the optical portion of the cornea. 
     
     
         4 . The covering of  claim 2 , wherein the inner portion comprises a first curved portion and the outer portion comprises a second curved portion and a third curved portion, wherein,
 the first curved portion comprises a first lower surface having a first radius of curvature;   the second curved portion comprises a second lower surface having a second radius of curvature; and   a third curved portion comprises a third lower surface having a third radius of curvature;   wherein the third curved portion is configured to inhibit movement of the inner portion relative to the optical portion of the cornea by deforming the third curved portion during the applying of the covering so as to promote motion-inhibiting engagement of the third lower surface against the eye.   
     
     
         5 . The covering of  claim 2 , wherein,
 the inner portion comprises a substantially uniform thickness; and   the inner portion comprises an index of refraction that substantially corresponds to the index of refraction of the cornea.   
     
     
         6 . The covering of  claim 2 , wherein the covering is formed from a material selected from silicone, silicone hydrogel, and a combination thereof. 
     
     
         7 . The covering of  claim 2 , wherein the inner portion comprises a radius of curvature less than the optical power of the cornea, and is configured to deform during the application of the covering so that the inner radius of curvature of the inner portion at least partially conforms to the cornea. 
     
     
         8 . The covering of  claim 2 , wherein a lower surface of the inner portion comprises an aspherical surface. 
     
     
         9 . The covering of  claim 2 , wherein the inner portion is characterized by a thickness from about 50 μm to about 250 μm. 
     
     
         10 . The covering of  claim 2 , wherein the material forming the covering is characterized by a water content of no more than 1%; an Ionoton Ion Permeability Coefficient of no more than about 2.6×10 −6  mm 2 /min; and an oxygen permeability Dk of 100 or more. 
     
     
         11 . The covering of  claim 2 , wherein,
 the inner rigidity is from 2.5E-6 Pa-m 3  to 6.41E-3 Pa-m 3 ; and   the outer rigidity is no more than 4E-5 Pa-m 3 .   
     
     
         12 . The covering of  claim 2 , wherein,
 inner modulus comprises a modulus in a range from 1 MPa to 35 MPa; and   the outer portion comprises a modulus of no more than 5 MPa.   
     
     
         13 . The covering of  claim 2 , wherein, the inner portion is centered on the optical portion of the cornea. 
     
     
         14 . A method of treating an eye of a patient, comprising applying the covering of  claim 2  to an eye of a patient.