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For use with a surgical tool for making incisions in the sclera of an eye to form a scleral pocket to receive a scleral prosthesis, a system and method is disclosed for determining a position on the sclera for locating the scleral pocket. The system and method determines an optimum location for the

For use with a surgical tool for making incisions in the sclera of an eye to form a scleral pocket to receive a scleral prosthesis, a system and method is disclosed for determining a position on the sclera for locating the scleral pocket. The system and method determines an optimum location for the scleral pocket. The system and method determines a location on the sclera that represents the intersection of the lens equatorial plane with the external surface of the sclera. The front of the scleral pocket is placed at a location that is four hundred fifty microns posterior to the intersection of the lens equatorial plane with the external surface of the sclera.

대표청구항 ▼

1. For use with a surgical tool, an apparatus comprising: a controller comprising a processing device, the controller operable to: (i) receive eye measurements that measure portions of an eye of a patient; (ii) use the eye measurements to create a mathematical model of the eye; (iii) determine from

1. For use with a surgical tool, an apparatus comprising: a controller comprising a processing device, the controller operable to: (i) receive eye measurements that measure portions of an eye of a patient; (ii) use the eye measurements to create a mathematical model of the eye; (iii) determine from the mathematical model of the eye a location, within scleral tissue of the eye, of a scleral pocket that is to receive a scleral prosthesis; and (iv) output the determined location;wherein the controller is operable to determine the location of the scleral pocket by determining from the mathematical model a location of a lens equatorial plane of the eye and where a projection of the lens equatorial plane actually intersects a sclera of the eye; andwherein the controller is operable to determine the location of the lens equatorial plane by multiplying a thickness of a lens of the eye by an empirical percentage, the empirical percentage based on an age of the patient. 2. The apparatus as claimed in claim 1, wherein the controller is operable to determine the location of the scleral pocket by: determining a radius of a scleral shell of the eye;determining a distance between a corneal plane of the eye and the lens equatorial plane;determining a distance from a center of the scleral shell to the lens equatorial plane based on the distance between the corneal plane and the lens equatorial plane;determining a distance from an axis of the eye to a location where the projection of the lens equatorial plane intersects the sclera based on the radius of the scleral shell and the distance from the center of the scleral shell to the lens equatorial plane; anddetermining a distance from the axis of the eye to one end of the scleral pocket based on the distance from the axis of the eye to the location where the projection of the lens equatorial plane intersects the sclera. 3. The apparatus as claimed in claim 2, wherein the controller is operable to determine the radius of the scleral shell from a measured value of corneal diameter of a cornea of the eye, a measured value of mean radius of curvature of the cornea, and a measured value of an axial length of the eye. 4. The apparatus as claimed in claim 1, wherein the controller is operable to determine the thickness of the lens by determining a difference between (i) a distance from an anterior central corneal surface of the eye and an anterior surface of the lens and (ii) a distance from the anterior central corneal surface and a posterior surface of the lens. 5. The apparatus as claimed in claim 2, wherein the controller is operable to determine the distance between the corneal plane and the lens equatorial plane by subtracting (i) a distance between an anterior central corneal surface of the eye and the corneal plane from (ii) a distance between the anterior central corneal surface and the lens equatorial plane. 6. The apparatus as claimed in claim 2, wherein the controller is operable to determine the distance from the center of the scleral shell to the lens equatorial plane by subtracting (i) the distance between the corneal plane and the lens equatorial plane from (ii) a distance between the center of the scleral shell and the corneal plane. 7. The apparatus as claimed in claim 2, wherein the controller is operable to determine the distance from the axis of the eye to one end of the scleral pocket by adding (i) a specified distance and (ii) the distance from the axis of the eye to the location where the projection of the lens equatorial plane intersects the sclera. 8. The apparatus as claimed in claim 2, wherein the controller is operable to determine the distance from the axis of the eye to one end of the scleral pocket by determining a position where it is optimal to locate a front of the scleral pocket on the sclera of the eye. 9. The apparatus as claimed in claim 1, wherein the controller is further operable to determine from the mathematical model of the eye a distance from a center of a cornea of the eye to a position on the sclera of the eye where it is optimal to place a center of a scleral tissue fixation tool to restrain movement of the surgical tool when the surgical tool makes an incision in the sclera of the eye to form the scleral pocket. 10. The apparatus as claimed in claim 1, wherein the controller is operable to receive information concerning the eye from an input unit. 11. The apparatus as claimed in claim 1, wherein the controller is further operable to provide information derived from the mathematical model of the eye to one of: a data display, a surgical tool controller, and an applanation marking plate assembly. 12. The apparatus of claim 1, wherein the controller is operable to determine the location of the scleral pocket within the scleral tissue of the eye such that the scleral prosthesis, once inserted into the scleral pocket, increases an effective working distance of a ciliary muscle in the eye to increases an amplitude of accommodation of the eye. 13. For use with a surgical tool, a method comprising the steps of: receiving eye measurements that measure portions of an eye of a patient at a controller, the controller comprising a processing device;using the eye measurements at the controller to create a mathematical model of the eye;determining at the controller from the mathematical model of the eye a location, within scleral tissue of the eye, of a scleral pocket that is to receive a scleral prosthesis; andoutputting the determined location;wherein determining the location of the scleral pocket comprises determining from the mathematical model a location of a lens equatorial plane of the eye and where a projection of the lens equatorial plane actually intersects a sclera of the eye; andwherein determining; the location of the lens equatorial plane comprises multiplying a thickness of a lens of the eye by an empirical percentage, the empirical percentage based on an age of the patient. 14. The method as claimed in claim 13, wherein determining the location of the scleral pocket comprises: determining a radius of a scleral shell of the eye;determining a distance between a corneal plane of the eye and the lens equatorial plane;determining a distance from a center of the scleral shell to the lens equatorial plane based on the distance between the corneal plane and the lens equatorial plane;determining a distance from an axis of the eye to a location where the projection of the lens equatorial plane intersects the sclera based on the radius of the scleral shell and the distance from the center of the scleral shell to the lens equatorial plane; anddetermining a distance from the axis of the eye to one end of the scleral pocket based on the distance from the axis of the eye to the location where the projection of the lens equatorial plane intersects the sclera. 15. The method as claimed in claim 13, further comprising the steps of: receiving at the controller, from an input unit, information concerning the eye; andproviding information derived from the mathematical model of the eye to at least one of: a data display, a surgical tool controller, and an applanation marking plate assembly. 16. The method of claim 14, wherein determining the radius of the scleral shell comprises determining the radius of the scleral shell using a measured value of corneal diameter of a cornea of the eye, a measured value of mean radius of curvature of the cornea, and a measured value of an axial length of the eye. 17. The method of claim 14, wherein: determining the distance between the corneal plane and the lens equatorial plane comprises subtracting (i) a distance between an anterior central corneal surface of the eye and the corneal plane from (ii) a distance between the anterior central corneal surface and the lens equatorial plane; anddetermining the distance from the center of the scleral shell to the lens equatorial plane comprises subtracting (i) the distance between the corneal plane and the lens equatorial plane from (ii) a distance between the center of the scleral shell and the corneal plane. 18. A system comprising: a memory configured to store a mathematical model of a patient's eye; anda processing device configured to: determine from the mathematical model of the eye a location, within scleral tissue of the eye, of a scleral pocket that is to receive a scleral prosthesis; andoutput the determined location;wherein the processing device is operable to determine the location of the scleral pocket by determining from the mathematical model a location of a lens equatorial plane of the eye and where a projection of the lens equatorial plane actually intersects a sclera of the eye; andwherein the processing device is operable to determine the location of the lens equatorial plane by multiplying a thickness of a lens of the eye by an empirical percentage, the empirical percentage based on an age of the patient. 19. The system of claim 18, wherein the processing device is operable to determine the location of the scleral pocket by: determining a radius of a scleral shell of the eye;determining a distance between a corneal plane of the eye and the lens equatorial plane;determining a distance from a center of the scleral shell to the lens equatorial plane based on the distance between the corneal plane and the lens equatorial plane;determining a distance from an axis of the eye to a location where the projection of the lens equatorial plane intersects the sclera based on the radius of the scleral shell and the distance from the center of the scleral shell to the lens equatorial plane; anddetermining a distance from the axis of the eye to one end of the scleral pocket based on the distance from the axis of the eye to the location where the projection of the lens equatorial plane intersects the sclera. 20. The system of claim 19, wherein: the processing device is operable to determine the radius of the scleral shell from a measured value of corneal diameter of a cornea of the eye, a measured value of mean radius of curvature of the cornea, and a measured value of an axial length of the eye;the processing device is operable to determine the thickness of the lens by determining a difference between (i) a distance from an anterior central corneal surface of the eye and an anterior surface of the lens and (ii) a distance from the anterior central corneal surface and a posterior surface of the lens;the processing device is operable to determine the distance between the corneal plane and the lens equatorial plane by subtracting (i) a distance between the anterior central corneal surface of the eye and the corneal plane from (ii) a distance between the anterior central corneal surface and the lens equatorial plane;the processing device is operable to determine the distance from the center of the scleral shell to the lens equatorial plane by subtracting (i) the distance between the corneal plane and the lens equatorial plane from (ii) a distance between the center of the scleral shell and the corneal plane; andthe processing device is operable to determine the distance from the axis of the eye to one end of the scleral pocket by adding (i) a specified distance and (ii) the distance from the axis of the eye to the location where the projection of the lens equatorial plane intersects the sclera. 21. A method comprising: storing a mathematical model of a patient's eye in a memory of a controller, the controller also comprising a processing device;determining at the controller from the mathematical model of the eye a location, within scleral tissue of the eye, of a scleral pocket that is to receive a scleral prosthesis; andoutputting the determined location;wherein determining the location of the scleral pocket comprises determining from the mathematical model a location of a lens equatorial plane of the eye and where a projection of the lens equatorial plane actually intersects a sclera of the eye; andwherein determining the location of the lens equatorial plane comprises multiplying a thickness of a lens of the eye by an empirical percentage, the empirical percentage based on an age of the patient.