Method for providing control data for ophthalmic laser of treatment device

Abstract

The invention relates to a method for providing control data for an ophthalmic laser (12) of a treatment device (10) for treating a cornea (16) of an eye. To this end, a control device (18) of the treatment device (10) can: determine (S10) eye parameters from predetermined examination data; determining (S12) a respective diameter of the respective optical zone (OZ) by means of the control device (18) as a function of the determined eye parameters, wherein a diameter for treating the cornea (16) is selected from the determined diameters of the optical zones (OZ); and providing (S14) control data comprising the selected diameter of the optical zone (OZ).

Description

Technical Field

[0001] The invention relates to a method for providing control data for an ophthalmic laser of a treatment device for treating the cornea of ​​an eye. Furthermore, the invention relates to a control device configured to perform the method, a treatment device having such a control device, a computer program comprising commands for causing the treatment device to perform the method, and a computer-readable medium having the computer program stored thereon. Background Art

[0002] Therapeutic devices and methods for controlling ophthalmic lasers to correct optical visual disorders or pathological and / or unnaturally altered areas of the cornea are known in the prior art, wherein the pulsed laser and the beam focusing device can, for example, be formed such that the laser pulses achieve photodisruption and / or ablation in a focus located within the organic tissue to remove tissue, in particular tissue lenticules, from the cornea.

[0003] In such treatments, the optical zone and the transition zone adjacent thereto are usually set as treatment zones. Here, the optical zone provides the planned diameter of the treatment, in which the optically effective zone will be carried out to change the optical properties of the cornea. The transition zone adjacent thereto is intended to provide a smooth transition from the separated tissue of the optical zone to the remaining corneal tissue. Usually, the choice of the diameter of the optical zone is freely selectable in the treatment device and is set according to empirical values. However, they do not have to match the optimal diameter of the optical zone, because in particular, a variety of factors should be taken into account when setting the optimized diameter of the optical zone. SUMMARY OF THE INVENTION

[0005] It is therefore an object of the present invention to simplify and / or improve the planning of treatment of the cornea, in particular the setting of the diameter of the optical zone.

[0006] This object is solved by the independent claims. Advantageous embodiments of the invention are disclosed in the dependent claims, the following description and the drawings.

[0007] The invention is based on the idea of ​​automatically providing diameters of the optical zone, which are optimized for the treatment, depending on the treatment to be performed, which can be determined from predetermined eye parameters. For example, at least one diameter of the optical zone can be determined and / or a diameter range can be provided, i.e. a diameter range between two diameter values ​​and optimized for the planned treatment.

[0008] One aspect of the invention relates to a method for providing control data for an ophthalmic laser of a treatment device for treating the cornea of ​​an eye, wherein the method comprises the following steps performed by a control device. The control device may be understood as an apparatus or an apparatus component, in particular a computer or a processor, which automatically performs the following steps according to the specification of predetermined parameters and / or wherein the individual steps may be performed according to user input.

[0009] In the method, eye parameters are determined from predetermined examination data, and the control device determines the corresponding diameter of the corresponding optical zone based on the determined eye parameters, wherein the diameter for treating the cornea is selected from the determined diameters of the optical zone, and control data including the selected diameter of the optical zone is provided.

[0010] In other words, predetermined examination data can first be provided to the control device, for example, by transmitting the examination data from the examination device to the control device via a wireless and / or wired connection. Alternatively or additionally, the examination data can also be manually input into the control device via a user interface. The control device can determine eye parameters therefrom, such as visual impairment data, in particular myopia values, hyperopia values, astigmatism values ​​and / or spherical aberration values. Furthermore, values ​​for pupil size can also be provided in the eye parameters, in particular under dark vision conditions or in the case of a maximized pupil. Preferably, information about a pre-treatment of the eye and / or a currently planned treatment can also be provided in the eye parameters.

[0011] Based on these eye parameters, the control device can preferably determine in an automatic manner at least one diameter of the optical zone, which diameter is optimized in the previously determined eye parameters. For example, this can be performed by a lookup table and / or a preset calculation formula and / or a decision tree. Preferably, a plurality of diameters can be provided, wherein each diameter defines a further optical zone, wherein these optical zones can all be optimized for the determined eye parameters. This means that there can be a plurality of diameters, which can be used for the treatment, which can then be offered to the user for selection. The user can then select one of the offered diameters to treat the cornea, for example via a user interface. For example, if the control device only determines one diameter for the optical zone, the control device can preferably select this diameter in an automatic manner.

[0012] The selected diameter of the optical zone may then be provided in the form of control data to a treatment device which, when executing the control data, treats the cornea of ​​the eye at the selected optical zone diameter.

[0013] Preferably, the control device may provide a diameter of the optical zone that provides a change in corneal curvature by reducing degeneration and / or regeneration of the corneal epithelium, and the diameter of the optical zone is smaller than a diameter of the cornea.

[0014] The invention has the advantage that since the optimized diameter is automatically determined based on the eye parameters, no further considerations and / or calculations are required by the user, thus facilitating the user to plan corneal treatment. Furthermore, since the optimized diameter is always available for the optical zone, treatment results can be improved.

[0015] The invention also includes embodiments that produce additional advantages.

[0016] In one embodiment, the eye parameters include at least one pupil diameter, in particular the pupil diameter of the scotopic pupil, wherein the diameter provided for the optical zone is greater than the pupil diameter. This means that the diameter of the optical zone is provided to cover at least the area of ​​the pupil, in particular the area of ​​the pupil with the largest diameter. Here, the diameter of the optical zone can preferably be limited downwards to a determined pupil diameter range and upwards to a corneal diameter range, and alternatively or additionally, the diameter of the optical zone can be limited toward the top according to further parameters, which can preferably be determined according to the eye parameters. By means of this embodiment, the advantage is that, in particular under poor lighting conditions, for example in the dark, no damage will occur after the treatment.

[0017] In another embodiment, the type of correction, in particular myopia correction or hyperopia correction, is determined according to eye parameters, wherein the optical zone diameter is larger for correction data in which the ablation is mainly performed at the peripheral position of the cornea than for correction types in which the ablation is mainly performed at the central position of the cornea. The central position of the cornea can be set, for example, by the pupil center point and / or the corneal vertex and the peripheral position radially spaced from the center. For example, if a hyperopia correction is planned, the main part of the ablation focus can be performed at the peripheral position of the cornea due to the removal of microlenses in the form of diverging lenses from the cornea to compensate for the hyperopic part. In such a hyperopia correction, the optical zone can be provided with a larger diameter than, for example, a myopia correction, in which more tissue is removed in the center than in the periphery. Here, the main part of the ablation means that at least 60%, preferably more than 80%, of the tissue to be removed is located at the peripheral position. Preferably, in transepithelial ablation, the optical zone can be provided with a diameter in which the treatment of the stroma is ensured. With this embodiment, the advantage is that the diameter of the optical zone can be optimized according to the planned correction.

[0018] In a further embodiment, three diameter ranges are preset, wherein a first diameter range is defined with diameters greater than a first diameter value, a second diameter range with diameters in a range from a first diameter value to a second diameter value, wherein the first diameter value is greater than the second diameter value, and a third diameter range with diameters less than the second diameter value, wherein one of the three diameter ranges and its associated diameter is set according to the eye parameters. This means that diameters within a defined diameter range may then be provided for selection. In other words, the control device may provide diameters divided into three preset diameter ranges. Wherein a first or upper diameter range includes diameters above a first diameter value, and a third or lower diameter range includes diameters below a second diameter value. In a second or intermediate diameter range, diameters within a range of a first diameter value and a second diameter value are provided. Thus, the control device may set this diameter range in which the diameter is located to best match the current eye parameters.

[0019] For the diameter ranges, the first diameter value is preferably 7 mm and the second diameter value is preferably 6.5 mm. This means that the first diameter range includes diameters greater than 7 mm, the second diameter range includes diameters from 6.5 mm to 7 mm, and the third diameter range includes diameters less than 6.5 mm. These diameter values ​​represent statistically determined limit values ​​that have proven to be particularly advantageous for treating various conditions described below.

[0020] In further embodiments, a first diameter range is provided if one or more of the following conditions are met:

[0021] - astigmatism higher than the preset astigmatism value, in particular greater than or equal to 2.5 diopters;

[0022] - after the myopia correction as a first treatment, there is a second myopia correction treatment;

[0023] - after the hyperopia correction as a first treatment, there is a second hyperopia correction treatment;

[0024] - Myopia with spherical aberration higher than 0.25 diopters;

[0025] - Presence of hyperopia with spherical aberration less than 0 diopters.

[0026] A second diameter range may be available if one or more of the following conditions are met:

[0027] - had the first treatment for myopia correction;

[0028] - had the first treatment for hyperopia correction;

[0029] - after the hyperopia correction as a first treatment, there is a second treatment of myopia correction;

[0030] - Myopia with spherical aberration less than 0.25 diopters;

[0031] - Presence of hyperopia with spherical aberration ranging from 0 diopters to 0.25 diopters.

[0032] A third diameter range may be available if one or more of the following conditions are met:

[0033] - After myopia correction as the first treatment, a second treatment of hyperopia correction is performed;

[0034] - Presence of hyperopia with spherical aberration greater than 0.25 diopters.

[0035] Thus, the control means may be arranged in the form of a look-up table or decision tree to determine which of the three diameter ranges to provide the optical zone diameter therein for selection.

[0036] In another embodiment, the following calculation is performed to determine the diameter of the optic zone:

[0037] -OZ 1 =7.6+0.15*min(Sph;Sph+Cyl;0);

[0038] -OZ 2 =7.8–0.3*max(Sph;Sph+Cyl;0);

[0039] -OZ 3 =7.5–0.25*abs(Cyl);

[0040] Among them, OZ 1 , OZ 2 , OZ 3 are the diameter values ​​of the optical zone (OZ), Sph is the spherical refractive value, Cyl is the cylindrical refractive value, and OZ 1 , OZ 2 and OZ 3 The minimum value or OZ 1 , OZ 2 and OZ 3 The maximum value or OZ 1 , OZ 2 and OZ 3 The average value of is chosen as the diameter. For example, the choice of minimum, maximum or average value may be decided depending on the planned treatment, in particular whether to preserve corneal volume, maximize treatment results or provide a compromise between the two.

[0041] Another aspect of the invention relates to a method for controlling a therapeutic device. The method comprises the method steps of at least one embodiment of the method as previously described. In addition, the method for controlling a therapeutic device comprises the step of transmitting the provided control data to at least one ophthalmic laser of the therapeutic device and controlling the therapeutic device and / or the laser using the control data.

[0042] The corresponding method may include at least one additional step, which is performed if and only if an application case or application situation occurs, which application case or application situation is not explicitly described here. For example, this step may include outputting an error message and / or outputting a request for input user feedback. Additionally or alternatively, it may be provided that a default setting and / or a predetermined initial state is adjusted.

[0043] Another aspect of the present invention relates to a control device, which is formed to perform the steps of at least one embodiment of one or both of the aforementioned methods. In addition, the control device may include a computing unit, such as a processor, for electronic data processing. The computing unit may include at least one microcontroller and / or at least one microprocessor. The computing unit may be configured as an integrated circuit and / or a microchip. In addition, the control device may include an (electronic) data memory or a storage unit. A program code may be stored on a data memory, by which the steps of the corresponding embodiments of the corresponding method are encoded. The program code may include control data for the corresponding laser. The program code may be executed by a computing unit, thereby causing the control device to perform the corresponding embodiment. The control device may be formed as a control chip or a control unit. The control device may, for example, be included in a computer or a computer cluster.

[0044] Another aspect of the invention relates to a treatment device having at least one eye surgery or ophthalmic laser and a control device, which is formed to perform the steps of at least one embodiment of one or both of the above-mentioned methods. The corresponding laser can be formed to at least partially separate a predetermined corneal volume from a predetermined interface of the human or animal eye by optical breakthrough, in particular by photodisruption and / or by ablating corneal layers by means of (photo)ablation and / or achieving a laser-induced refractive index change in the cornea and / or the eye lens and / or increasing cross-linking of the cornea.

[0045] In another embodiment of the treatment device according to the invention, the laser can be suitable for emitting laser pulses with a wavelength range between 300nm and 1400nm, preferably between 900nm and 1200nm, and a repetition frequency greater than 10 kilohertz (kHz), preferably between 100kHz and 100 megahertz (MHz), with a corresponding pulse duration between 1fs and 1ns, preferably between 10fs and 10ps. The use of such a laser in the method according to the invention also has the advantage that the irradiation of the cornea does not have to be carried out in a wavelength range below 300nm. This range is included in the term "deep ultraviolet" in laser technology. As a result, accidental damage to the cornea caused by these extremely short wavelength and high-energy beams is advantageously avoided. Photodisruptive and / or ablative lasers of the type used here usually input pulsed laser radiation with a pulse duration between 1fs and 1ns into the corneal tissue. As a result, the power density of the corresponding laser pulses required for optical breakdown can be narrowly limited spatially, so that a high cutting accuracy can be achieved in the generation of the interface. In particular, the range between 700 nm and 780 nm may also be selected as the wavelength range.

[0046] In another embodiment of the therapeutic device according to the invention, the control device may include at least one storage device for at least temporarily storing at least one control data set, wherein one or more control data sets include control data for positioning and / or for focusing individual laser pulses in the cornea; and may include at least one beam device for beam guiding and / or beam shaping and / or beam deflection and / or beam focusing of the laser beam of the laser.

[0047] Another aspect of the invention relates to a computer program. The computer program includes, for example, commands forming a program code. The program code may include at least one control data set having corresponding control data for a corresponding laser. When the program code is executed by a computer or a computer cluster, the previously described method or at least one embodiment thereof is performed.

[0048] Another aspect of the present invention relates to a computer-readable medium (storage medium) on which the above-mentioned computer program and its commands are stored respectively. In order to execute the computer program, a computer or a computer cluster can access the computer-readable medium and read out its content. For example, the storage medium is formed as a data memory, in particular at least partially formed as a volatile or non-volatile data memory. The non-volatile data memory can be a flash memory and / or an SSD (solid state drive) and / or a hard disk. The volatile data memory can be a RAM (random access memory). For example, the command can exist as a source code of a programming language and / or as an assembler and / or as a binary code.

[0049] Further features and advantages of one of the aspects described herein may result from the embodiments of another aspect of the invention. Therefore, if the features of the embodiments of the invention are not explicitly described as mutually exclusive, they may exist in any combination with each other.

[0050] In addition to the diameter of the optical zone, the control data may also include a corresponding data set for positioning and / or focusing the individual laser pulses in the cornea. Additionally or alternatively, the control data may include a corresponding data set for adjusting at least one beam device for beam guidance and / or beam shaping and / or beam deflection and / or beam focusing of the laser beam of the corresponding laser. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Below, additional features and advantages of the present invention are described in the form of advantageous implementation examples based on the accompanying drawings. The features or feature combinations of the implementation examples described below may exist in any combination in combination with each other and / or with the feature combinations of the implementation examples. This means that the features of the implementation examples may supplement and / or replace the features of the implementation examples, and vice versa. Therefore, configurations are also considered to be covered and disclosed by the present invention, which are not explicitly shown or explained in the drawings, but are produced and can be generated by separate feature combinations from the implementation examples and / or implementation examples. Therefore, configurations are also considered to be disclosed, which do not include all the features of the originally proposed claims or extend beyond or deviate from the feature combinations set forth in the relationship of the claims. For the implementation examples, it is shown:

[0052] Figure 1 is a schematic diagram of a therapeutic device according to an exemplary embodiment;

[0053] Figure 2 is a schematic diagram of a method for providing control data according to an exemplary embodiment.

[0054] In the figures, identical or functionally identical elements are provided with the same reference symbols. DETAILED DESCRIPTION OF THE INVENTION

[0056] Figure 1 A schematic diagram of a treatment device 10 is shown with an ophthalmic laser 12 for removing a volume 14 from a human or animal cornea 16 by photodestruction and / or ablation. For example, the volume 14 may represent a lenticule, which may be separated from the cornea 16 by the ophthalmic surgical laser 12 to correct a visual disorder. A corrective contour or geometry of the volume 14 to be removed, in particular including the diameter of the optical zone OZ in which optically effective changes for the correction of the visual disorder occur, may be provided or determined by a control device 18, in particular in the form of control data, so that the laser 12 emits laser pulses into the cornea 16 of the eye in a pattern predefined by the control data to remove the volume 14. Alternatively, the control device 18 may be a control device 18 external to the treatment device 10.

[0057] also, Figure 1 It is shown that a laser beam 20 generated by a laser 12 can be deflected toward the cornea 16 by a beam deflection device 22 (eg, a rotary scanner) to remove the volume 14. The beam deflection device 22 can also be controlled by a control device 18 to remove the volume 14.

[0058] Preferably, the laser 12 shown may be a photodisruptive and / or photoablative laser formed to emit laser pulses having a wavelength in the range of between 300 nanometers and 1400 nanometers, preferably between 700 nanometers and 1200 nanometers, with a respective pulse duration between 1 femtosecond and 1 nanosecond, preferably between 10 femtoseconds and 10 picoseconds, and with a repetition frequency of the laser pulses greater than 10 kilohertz, preferably between 100 kilohertz and 100 megahertz. In addition, the control device 18 optionally comprises a storage device (not shown) for at least temporarily storing at least one control data set, wherein one or more control data sets comprise control data for positioning in the cornea and / or for focusing the individual laser pulses.

[0059] When removing the volume 14 from the cornea 16, in particular the selection of the diameter of the optical zone OZ plays an important role for the success of the treatment. The size of the optical zone OZ is firstly freely selectable, wherein it has been determined that, depending on eye parameters, such as the type of refractive correction and / or pretreatment of the cornea 16, an optimal diameter can be selected for the optical zone OZ, but these diameters are not immediately apparent. In order to help the user set the diameter of the optical zone and thus improve the treatment, Figure 2 The method shown in FIG. 1 can be carried out by the control device 18 and / or a control device external to the treatment device 10 , which belongs to the planning device, for example.

[0060] Figure 2 A schematic diagram of a method for providing control data to an ophthalmic laser 12 of a treatment device 10 for treating a cornea 16 of an eye is shown.

[0061] In step S10, eye parameters can be determined based on predetermined examination data, wherein the examination data can be provided from previously performed diagnostic measurements. In this case, the eye parameters relate to properties of the eye to be treated and / or the cornea 16, such as pupil diameter (preferably in a scotopic pupil), visual impairment data of the eye (in particular myopia, hyperopia and astigmatism values ​​with corresponding spherical aberrations) and / or treatments to be performed and treatments that have already been performed.

[0062] In step S12 , the control device can determine at least one diameter of the optical zone OZ which is optimized for the determined eye parameters. In particular, it can be provided that a plurality of diameters are determined, wherein each diameter provides a further optical zone OZ for treatment.

[0063] To determine the optimized diameter of the optical zone OZ, the control device can take into account various eye parameters. For example, the minimum diameter of the optical zone OZ can be set based on the pupil diameter, in particular the pupil diameter of the scotopic pupil. As another criterion, for example, it can be determined the type of correction to be performed on the cornea 16, wherein in particular for hyperopia correction, in which the main part of the ablation is performed at the peripheral position of the cornea, a larger diameter is provided for the optical zone OZ than for myopia correction.

[0064] Particularly preferably, at least three diameter ranges, a diameter less than 6.5 mm, a diameter greater than 7 mm, and a diameter between 6.5 mm and 7 mm, can be recorded in the control device 18. Then, according to the current eye parameters, the control device 18 can decide which diameter range to provide for selection, wherein the diameter range with a diameter value greater than 7 mm is provided, for example, under one or more of the following conditions:

[0065] - astigmatism higher than the preset astigmatism value, in particular greater than or equal to 2.5 diopters;

[0066] - after the myopia correction as a first treatment, there is a second myopia correction treatment;

[0067] - after the hyperopia correction as a first treatment, there is a second hyperopia correction treatment;

[0068] - Myopia with spherical aberration higher than 0.25 diopters;

[0069] - Presence of hyperopia with spherical aberration less than 0 diopters.

[0070] The control device 18 may provide a value for the diameter range between 6.5 mm and 7 mm if one or more of the following conditions exist:

[0071] - had the first treatment for myopia correction;

[0072] - had the first treatment for hyperopia correction;

[0073] - after the hyperopia correction as a first treatment, there is a second treatment of myopia correction;

[0074] - Myopia with spherical aberration less than 0.25 diopters;

[0075] - Presence of hyperopia with spherical aberration ranging from 0 diopters to 0.25 diopters.

[0076] A diameter range of less than 6.5 mm may be provided for selection if one of the following conditions exists:

[0077] - After myopia correction as the first treatment, a second treatment of hyperopia correction is performed;

[0078] - Presence of hyperopia with spherical aberration greater than 0.25 diopters.

[0079] Alternatively or additionally, the following calculation formula can also be entered in the control device 18, by means of which the optimized diameter for the respective treatment can be determined:

[0080] -OZ 1 =7.6+0.15*min(Sph;Sph+Cyl;0);

[0081] -OZ 2 =7.8–0.3*max(Sph;Sph+Cyl;0);

[0082] -OZ 3 =7.5–0.25*abs(Cyl),

[0083] Among them, OZ 1 , OZ 2 and OZ 3 are the diameter of the optical zone, Sph is the spherical refractive value, and Cyl is the cylindrical refractive value. The values ​​can be derived from statistics applied to previous patient data, in particular from fitted values. 1 , OZ 2 and OZ 3 Thereafter, a minimum, maximum or average value may be determined, for example, from these values ​​to provide the diameter of the optic zone OZ.

[0084] Preferably, if volume conservation is desired, the minimum value can be used, if the correction result is to be maximized, the maximum value can be used, and if a compromise is to be made between conservation and maximization of the treatment result, the average value can be used. Thus, a nomogram can be calculated in particular, in which the optimized diameter of the optical zone OZ can be read from the required power correction. Thus, for example, the following pairs of power correction values ​​for the diameter of the optical zone can be obtained:

[0085] (-18D; 5.5mm), (-15D; 5.9mm), (-12D; 6.2mm), (-9D; 6.6mm), (-6D; 7.0mm), (-3D; 7.4mm), (2D; 7.5mm), (4D; 6.9mm), (6D; 6.3mm), (8D; 5.7mm).

[0086] Particularly preferably, in transepithelial ablations, the meridian power can also be correlated with the uncertainty in epithelial thickness to ensure that a relevant portion of the correction is produced in the stroma. This means that the control device 18 can plan a larger diameter, for example the following value pair:

[0087] (-15D; 6.3mm), (-10D; 6.5mm), (-4D; 6.8mm), (-2D; 7.0mm), (-1D; 7.5mm), (1D; 8.0mm), (2D; 7.5mm), (3D; 7.2mm), (4D; 7.0mm).

[0088] Once the diameter of the optical zone OZ is determined, it can be provided to the user, who can select the diameter for treating the cornea 16 .

[0089] Finally, control data may be provided in step S14 by which the laser 12 and / or the beam deflection device 22 may be controlled to remove a volume 14 from the cornea 16 , wherein the volume 14 comprises a selected diameter of the optical zone OZ.

[0090] Overall, these examples demonstrate how the diameter of the optic zone OZ can be determined in an improved manner by means of the present invention.

Claims

1. A method for providing control data for an ophthalmic laser (12) of a treatment device (10) for treating a cornea (16) of an eye, wherein the method comprises the following steps performed by a control device (18): - determining (S10) eye parameters based on predetermined examination data; - determining (S12) a corresponding diameter of a corresponding optical zone (OZ) by means of the control device (18) based on the determined eye parameters, wherein the diameter for treating the cornea (16) is selected from among the determined diameters of the optical zone (OZ); - providing (S14) control data, said control data comprising a selected diameter of said optical zone (OZ).

2. The method according to claim 1, wherein: The eye parameters include at least one pupil diameter, wherein the optical zone is provided with a diameter greater than the pupil diameter.

3. A method according to any one of the preceding claims, wherein: A correction type is determined based on the eye parameters, wherein a larger diameter of the optical zone (OZ) is provided for a correction type in which a major portion of the cornea (16) is ablated at a peripheral position than for a correction type in which a major portion of the cornea (16) is ablated at a central position.

4. A method according to any one of the preceding claims, wherein: Three diameter ranges are preset, wherein a first diameter range having a diameter greater than a first diameter value, a second diameter range having a diameter within a range from the first diameter value to a second diameter value, wherein the first diameter value is greater than the second diameter value, and a third diameter range having a diameter less than the second diameter value, wherein one of the three diameter ranges and its associated diameter are set according to the eye parameters.

5. The method according to claim 4, wherein: The first diameter value is 7 mm and the second diameter value is 6.5 mm.

6. The method according to any one of claims 4 or 5, wherein: The first diameter range is provided if one or more of the following conditions are met: - Astigmatism is higher than the preset astigmatism value; - after myopia correction has been performed as a first treatment, a second treatment for myopia correction is performed; - after the hyperopia correction has been carried out as a first treatment, a second hyperopia correction treatment is carried out; - Myopia with spherical aberration higher than 0.25 diopters; - Hyperopia with spherical aberration less than 0 diopters; Wherein, if one or more of the following conditions are met, the second diameter range is provided: -First treatment for myopia correction; -First treatment for hyperopia correction; - After the hyperopia correction has been carried out as a first treatment, a second treatment of myopia correction is carried out; - Myopia with spherical aberration less than 0.25 diopters; - Hyperopia with spherical aberration ranging from 0 diopters to 0.25 diopters; Wherein, the third diameter range is provided if one or more of the following conditions are met: - After myopia correction as a first treatment, a second treatment of hyperopia correction is performed; - Hyperopia with spherical aberration greater than 0.25 diopters.

7. A method according to any one of the preceding claims, wherein: The following calculation is performed to determine the diameter of the optical zone (OZ): -OZ1=7.6+0.15*min(Sph; Sph+Cyl; 0); -OZ2=7.8–0.3*max(Sph; Sph+Cyl; 0); -OZ3 = 7.5–0.25*abs(Cyl); Wherein, OZ1, OZ2, OZ3 are diameter values ​​of the optical zone (OZ), Sph is the spherical refractive value, Cyl is the cylindrical refractive value, wherein - the minimum value among OZ1, OZ2 and OZ3 or - The maximum value among OZ1, OZ2 and OZ3 or - Average of OZ1, OZ2 and OZ3 is selected as the diameter.

8. A method for controlling a therapeutic device (10), wherein: The method comprises the following steps: - the method steps of the method according to any of the preceding claims, and - transmitting the provided control data to a corresponding ophthalmic laser (12) of the treatment device (10); and - controlling said laser (12) using said control data.

9. Control device (18) configured to carry out a respective method according to any of the preceding claims.

10. Treatment device (10) having at least one ophthalmic laser (12) for separating a corneal volume (14) of a human or animal eye by optical decomposition, and at least one control device (18) according to claim 9.

11. Computer program comprising commands causing a therapeutic device (10) according to claim 10 to perform a method according to any one of claims 1 to 7 and / or a method according to claim 8.

12. Computer readable medium having stored thereon a computer program according to claim 11.

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