Device, Method, and Control Program for Refractive Surgery
First Claim
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1. Apparatus for refractive surgery comprising the following:
- a laser-beam source (34),means (36) for shaping and guiding the laser beam emitted by the laser-beam source, in relation to an eye (10) to be treated,a camera (38) for recording the iris and pupil of the eye,a computer (40), comprising a control program for controlling the said means according to an ablation profile,characterized in thatthe control program;
includes a function of the position of the apex (A) of the cornea (12) of the eye (10) in dependence on at least one property of the pupil,during the refractive surgery, records the instantaneous property of the pupil by means of the camera and determines therefrom, by means of the said function, the position of the apex (A) of the cornea, andaligns the ablation profile to the thus determined position of the apex (A) or of a point of the corneal surface having a fixed distance from the apex.
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Abstract
An apparatus and a method for refractive surgery, in particular LASIK, make provision whereby the apex of the cornea is taken as a basis, as the ablation centre, for the refractive procedure. For this purpose, the dependence of the position of the apex on properties of the pupil is determined in the case of the eye to be treated and, from this dependence, measured properties of the pupil are used to calculate the position of the ablation centre during the refractive surgery.
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Citations
6 Claims
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1. Apparatus for refractive surgery comprising the following:
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a laser-beam source (34), means (36) for shaping and guiding the laser beam emitted by the laser-beam source, in relation to an eye (10) to be treated, a camera (38) for recording the iris and pupil of the eye, a computer (40), comprising a control program for controlling the said means according to an ablation profile, characterized in that the control program; includes a function of the position of the apex (A) of the cornea (12) of the eye (10) in dependence on at least one property of the pupil, during the refractive surgery, records the instantaneous property of the pupil by means of the camera and determines therefrom, by means of the said function, the position of the apex (A) of the cornea, and aligns the ablation profile to the thus determined position of the apex (A) or of a point of the corneal surface having a fixed distance from the apex. - View Dependent Claims (2, 3, 4)
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5. Control program for an apparatus for refractive surgery that comprises the following:
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a laser-beam source (34), means (36) for shaping and guiding the laser beam emitted by the laser-beam source, in relation to an eye (10) to be treated, a camera (38) for recording the iris and pupil of the eye, a computer (40), which executes the control program for the purpose of controlling the said means according to an ablation profile, characterized in that the control program; includes a function of the position of the apex (A) of the cornea (12) of the eye (10) in dependence on at least one property of the pupil, during the refractive surgery, records the instantaneous property of the pupil by means of the camera and determines therefrom, by means of the said function, the position of the apex (A) of the cornea, aligns the ablation profile to the thus determined position of the apex (A) or of a point on the corneal surface having a fixed distance from the apex.
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6. Method for generating a control program for refractive surgery, by means of which method laser radiation is directed onto or into an eye to be treated, according to a predefined spatial and time sequence, the predefined spatial and time sequence being aligned in relation to a site of the eye,
characterized in that before the refractive surgery, in the case of the eye to be treated, the dependence of the position of the apex (A), or of a point on the corneal surface having a fixed distance from the apex, on a property of the pupil that can alter during the refractive surgery is determined and stored.
Specification