Method and apparatus for providing precise location of points on the eye
First Claim
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1. A computer system based method of accurately aiming a pulsed laser beam onto an eye in a system with a low power registration laser beam for providing a laser spot on the eye indicating where a shot of the pulsed laser beam will strike the eye the low power registration laser beam being parallel to the pulsed laser beam;
- an aiming system controlled by the computer system for adjusting the aim of the pulsed laser beam and the registration laser beam onto the eye;
a computer system controlled eye tracking device that tracks a fixed point on the eye, that provides central point coordinates of a central point on the eye, and that provides registration coordinates of where the registration laser beam strikes the eye relative to the tracked central point on the eye; and
the computer system running ablation profile software for calculating next shot coordinates of where on the eye relative to the central point on the eye a next pulse of the pulsed laser beam should be fired, the method comprising the compute system operated steps of;
calculating the next shot coordinates;
generating an error vector by comparing the registration coordinates of where the low power registration laser beam strikes the eye relative to the tracked central point of the eye to the next shot coordinates of where the next pulse of the pulsed laser beam should be fired relative to the tracked central point of the eye;
adjusting the aim of the pulsed laser beam and the registration laser beam using the aiming system in response to said generated error vector; and
firing a pulse of the pulsed laser beam after said adjusting step.
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Abstract
A method and apparatus for providing more precise aiming by an eye tracking system, including a registration, or aiming, laser, that provides for precise location of where the next laser ablation shot will impinge upon the eye. The method and apparatus further includes an aiming assistance fixture that provides a fixed frame of reference for locating the origin of the eye.
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Citations
13 Claims
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1. A computer system based method of accurately aiming a pulsed laser beam onto an eye in a system with a low power registration laser beam for providing a laser spot on the eye indicating where a shot of the pulsed laser beam will strike the eye the low power registration laser beam being parallel to the pulsed laser beam;
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an aiming system controlled by the computer system for adjusting the aim of the pulsed laser beam and the registration laser beam onto the eye; a computer system controlled eye tracking device that tracks a fixed point on the eye, that provides central point coordinates of a central point on the eye, and that provides registration coordinates of where the registration laser beam strikes the eye relative to the tracked central point on the eye; and the computer system running ablation profile software for calculating next shot coordinates of where on the eye relative to the central point on the eye a next pulse of the pulsed laser beam should be fired, the method comprising the compute system operated steps of; calculating the next shot coordinates; generating an error vector by comparing the registration coordinates of where the low power registration laser beam strikes the eye relative to the tracked central point of the eye to the next shot coordinates of where the next pulse of the pulsed laser beam should be fired relative to the tracked central point of the eye; adjusting the aim of the pulsed laser beam and the registration laser beam using the aiming system in response to said generated error vector; and firing a pulse of the pulsed laser beam after said adjusting step. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system for adjusting the aim of a pulsed laser beam onto an eye in response to registration coordinates of a registration aiming laser beam striking the eye, the registration coordinates being provided relative to a fixed point on the eye by an eye tracking system that tracks that fixed point on the eye, the system comprising:
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a pulsed laser providing the pulsed laser beam; a low power registration laser providing the registration laser beam for providing a laser spot on the eye indicating where a shot of the pulsed laser beam will strike the eye, the low power registration laser beam being parallel to the pulsed laser beam; a computer system based controller including means for calculating a next desired shot location of where the next pulse of the pulsed laser beam should be fired onto the eye relative to a center location of the eye, and means for generating an error off set by comparing said next desired shot location of where the next pulse of the pulsed laser beam should be fired with the registration coordinates of where the registration laser beam strikes the eye relative to the fixed point on the eye; means for aiming the pulsed laser beam and the registration laser beam, said aiming means coupled to said controller and responsive to said error offset; and means for firing a pulse of the pulsed laser beam. - View Dependent Claims (10, 11, 12, 13)
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Specification