Conformable therapeutic shield for vision and pain
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. A covering for an eye of a patient, the eye comprising a cornea having an optical portion, an epithelium, and a sclera, the covering comprising:
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 at least partially disposed over and substantially conforming to the cornea and with the outer portion configured to engage the eye along the epithelium, the sclera, or a combination thereof; and wherein,
the inner portion is centered on an optical portion of the cornea;
the inner portion comprises a modulus from 1 MPa to 35 MPa; and
the outer portion comprises a modulus of no more than 5 MPa.
2. The covering of claim 1 , 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.
3. The covering of claim 1 , wherein the inner portion comprises a first curved portion and the outer portion comprises a second curved and an 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 sclera, the epithelium, or both the sclera and the epithelium of the eye.
4. The covering of claim 1 , wherein the inner portion comprises a substantially uniform thickness; and comprises an index of refraction that substantially corresponds to the index of refraction of the cornea.
5. The covering of claim 1 , wherein the covering is formed from a material selected from silicone, silicone hydrogel, and a combination thereof.
6. The covering of claim 1 , 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 substantially conforms to the cornea.
7. The covering of claim 1 , wherein the lower surface of the inner portion comprises an aspherical surface.
8. A covering for an eye of a patient, the eye comprising a cornea having an optical portion, an epithelium, and a sclera, the covering comprising:
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 at least partially disposed over and substantially conforming to the cornea and with the outer portion configured to engage the eye along the epithelium, the sclera, or a combination thereof; and wherein,
the inner portion is centered on an optical portion of the cornea;
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 .
9. A covering for an eye of a patient, the eye comprising a cornea having an optical portion, an epithelium, and a sclera, the covering comprising:
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 at least partially disposed over and substantially conforming to the cornea and with the outer portion configured to engage the eye along the epithelium, the sclera, or a combination thereof; and wherein,
the inner portion is centered on an optical portion of the cornea; and
the inner portion is characterized by a thickness from about 50 μm to about 250 μm.
10. A covering for an eye of a patient, the eye comprising a cornea having an optical portion, an epithelium, and a sclera, the covering comprising:
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 at least partially disposed over and substantially conforming to the cornea and with the outer portion configured to engage the eye along the epithelium, the sclera, or a combination thereof; and wherein,
the inner portion is centered on an optical portion of the cornea; and
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 1 , wherein when placed on the eye, the covering provides a gap between an inner surface of the covering and the cornea.