Device and method for creating a corneal reference for an eyetracker
Assignee20/10 Perfect Vision Optische Geraete GmbH
InventorsJosef Bille, Frieder Loesel
Life of this patent
Estimating the term…
Abstract
A device and method for increasing the accuracy of an ocular laser procedure by detecting and compensating for small eye movements includes the establishment of a corneal reference plane. To create the corneal reference plane, a laser beam is first used to photoablate stromal tissue at three different locations in the cornea. Bubbles that are created upon photoablation define the plane and can be imaged to determine the position of the plane as the eye moves. A pair of cameras and a processor are provided to image the cornea and triangulate the position of the reference plane. The updated position of the corneal reference plane is then used to guide the path of the laser beam during the course of the ocular procedure.
Claims20
A method for directing a laser beam to a target during an ocular laser procedure while compensating for eye movement, said method comprising the steps of:
- using a laser beam to photoablate tissue at three different locations in the stroma of the cornea to produce a reference mark at each said location;
- identifying a corneal reference plane using said three reference marks;
- calculating the position of said target relative to said corneal reference plane;
- and
- monitoring movements of said corneal reference plane to direct said laser beam to said target.
A system for directing a laser beam to a target during an ocular laser procedure while compensating for eye movement, said system comprising:
- means for photoablating the stroma of the eye to produce reference marks at three different locations to define a corneal reference plane;
- means for calculating the position of said target relative to said corneal reference plane;
- and
- means for monitoring movements of said corneal reference plane to direct said laser beam to said target.
An method for directing a laser beam to a target during an ocular laser procedure while compensating for eye movement, said method comprising the step of:
- photoablating the stroma of the eye at three different locations while the eye remains substantially in a first position to produce a reference mark at each said location, said reference marks for defining a corneal reference plane;
- establishing the position of said target relative to said corneal reference plane;
- determining the positions of said reference marks after the eye has moved to a second position;
- calculating the position of said target when said eye is in said second position;
- and
- directing said laser beam to said target when said eye is in said second position.
Dependencies are inferred from the claim text.