Method for providing control data for an eye surgical laser of a treatment apparatus
A method for providing control data of an eye surgical laser is disclosed. A control device ascertains a lenticule geometry of the lenticule to be separated from predetermined visual disorder data of a human or animal eye. The lenticule geometry is defined by means of a refractive power value to be corrected and a lenticule diameter. The control device ascertains a correction value for compensating for a deformation of the lenticule, which is generated by at least one contact element of the treatment apparatus. The control device ascertains a deformation geometry of the lenticule, wherein the deformation geometry is defined by means of the refractive power value and a deformation diameter. The deformation diameter is calculated depending on the lenticule diameter and the correction value, and provides control data for controlling the eye surgical laser, which uses the deformation geometry for the separation of the lenticule.
1. A method for providing control data for an eye surgical laser of a treatment apparatus for separation of a lenticule, wherein the method comprises the following steps performed by a control device:
ascertaining a lenticule geometry of the lenticule to be separated, which includes a lenticule height, from predetermined visual disorder data of a human or animal eye, wherein the lenticule geometry is defined by means of a refractive power value to be corrected and a lenticule diameter;
ascertaining a correction value for compensating for a deformation of the lenticule, which is generated by at least one contact element of the treatment apparatus, wherein the correction value is determined empirically from at least one measurement compensating for deformation of a lenticule of a preceding eye treatment of another eye that was treated with the treatment apparatus without the use of the correction value;
ascertaining a deformation geometry of the lenticule, which includes a deformation height, wherein the deformation geometry is defined by means of the refractive power value and a deformation diameter, wherein the deformation diameter is calculated depending on the lenticule diameter and the correction value; and
providing control data for controlling the eye surgical laser, which uses the deformation geometry for separating the lenticule;
wherein the correction value is ascertained from a deviation of the lenticule height, which is expected according to the lenticule geometry, and an achieved lenticule height, wherein the achieved lenticule height is determined after an application of the treatment apparatus without the use of the deformation geometry; and
wherein the achieved lenticule height is measured at least at two different points of time, wherein the correction value is ascertained from an average value of deviations between the at least two different points of time.
2. The method according to claim 1 , wherein the correction value is statistically determined from multiple preceding measurements of the lenticule height and the achieved lenticule height, in particular by means of a linear regression.
3. The method according to claim 1 , wherein
the correction value is combined with a refractive power correction value,
the refractive power correction value is ascertained from a deviation of the refractive power value to be corrected and an achieved refractive power value, in particular by means of a linear regression from multiple preceding measurements and an average value from refractive power value deviations at different points of time, and
the achieved refractive power value is determined after the application of the treatment apparatus.
4. The method according to claim 1 , wherein the correction value is in a range from 0.7 to 1.5.
5. The method according to claim 1 , wherein the deformation diameter is calculated by means of a multiplication of the lenticule diameter by a parameter depending on the correction value, and wherein the parameter is determined by means of a theoretical lenticule geometry model.
6. The method according to claim 5 , wherein a height is ascertained for the deformation height of the deformation geometry, which corresponds to a multiplication of the lenticule height by a reciprocal value of the correction value, in that the deformation diameter is calculated by means of a division of the lenticule diameter by a square root of the correction value.
7. A control device, which is formed to perform the method according claim 1 .
8. A treatment apparatus with at least one eye surgical laser for the separation of a lenticule of a human or animal eye by means of photodisruption and at least one control device according to claim 7 .
9. The treatment apparatus according to claim 8 , wherein the eye surgical laser is formed to emit laser pulses in a wavelength range between 300 nm and 1400 nm, at a respective pulse duration between 1 fs and 1 ns, and a repetition frequency of greater than 10 kHz.
10. The treatment apparatus according to claim 9 , wherein the eye surgical laser is formed to emit laser pulses in a wavelength range between 700 nm and 1200 nm, at a respective pulse duration between 10 fs and 10 ps, and a repetition frequency of between 100 kHz and 100 MHz.
11. The treatment apparatus according to claim 8 , wherein the control device comprises at least one storage device for at least temporary storage of at least one control dataset, wherein the at least one control dataset includes control data for positioning and/or focusing individual laser pulses in the human or animal eye; and
includes at least one beam device for beam guidance and/or beam shaping and/or beam deflection and/or beam focusing of a laser beam of the eye surgical laser.
12. A non-transitory computer-readable medium having stored thereon a computer program, the computer program including instructions, which cause a treatment apparatus with at least one eye surgical laser for the separation of a lenticule of a human or animal eye by means of photodisruption, and at least one control device to execute the method according to claim 1 .