초록 ▼

An apparatus for generating cut surfaces in the cornea of an eye in order to correct ametropia is provided, said apparatus comprising a laser unit, which can focus pulsed laser radiation into the cornea and move it therein in order to generate cut surfaces, and a control unit, which controls the las

An apparatus for generating cut surfaces in the cornea of an eye in order to correct ametropia is provided, said apparatus comprising a laser unit, which can focus pulsed laser radiation into the cornea and move it therein in order to generate cut surfaces, and a control unit, which controls the laser unit for generating cut surfaces such that a predetermined lenticle to be removed is separated from the surrounding corneal material in the cornea by at least one cut surface, and that at least two mutually spaced apart cut surfaces are formed as opening cuts, each extending from the lenticle to the anterior corneal surface, the position and shape of the opening cuts being selected such that the opening cuts contribute to the correction of the ametropia of the eye or do not counteract the correction of the ametropia of the eye.

대표청구항 ▼

1. A method for generating cut surfaces in a cornea of an eye in order to correct ametropia using an apparatus, said apparatus comprising: a laser unit, which focuses pulsed laser radiation into the cornea and moves said focused radiation therein in order to generate cut surfaces within the cornea;

1. A method for generating cut surfaces in a cornea of an eye in order to correct ametropia using an apparatus, said apparatus comprising: a laser unit, which focuses pulsed laser radiation into the cornea and moves said focused radiation therein in order to generate cut surfaces within the cornea; and a control unit, which controls the laser unit for generating cut surfaces such that a predetermined lenticle to be removed is separated from the surrounding corneal material within the cornea by at least one cut surface, the method comprising:forming at least two mutually spaced apart cut surfaces as opening cuts that are structured such that the lenticle or a portion thereof can be removed therethrough and that are structured such that the opening cuts do not lead to a corneal flap that can be folded back, each opening cut extending from the lenticle within the cornea to an anterior corneal, andselecting a position and a shape of each opening cut such that the opening cuts contribute to the correction of the ametropia of the eye or do not counteract the correction of the ametropia of the eye being made. 2. The method as claimed in claim 1, wherein the position and shape of the opening cuts are selected such that the correction of the ametropia of the eye is counteracted such that the opening cuts do not generate additional astigmatism of the eye. 3. The method as claimed in claim 1, wherein the ametropia to be corrected comprises an astigmatism of the eye. 4. The method as claimed in claim 1, wherein the position and shape of the opening cuts are selected such that they correct higher-order errors of refracting power of the cornea. 5. The method as claimed in claim 1, wherein the control unit controls the laser unit such that at least three spaced apart opening cuts are generated such that the centers of area of the opening cuts coincide with the corners of a regular polygon. 6. The method as claimed in claim 1, wherein the control unit controls the laser unit such that the cut length of at least one opening cut from the anterior corneal surface to the lenticle differs from the cut lengths of the other opening cuts. 7. The method as claimed in claim 1, wherein the control unit controls the laser unit such that exactly two mutually spaced apart opening cuts are generated so that the centers of area of the opening cuts are located on a straight line which, when viewed in a top view of the eye, is parallel to an axis of astigmatism of the eye or intersects said axis at a maximum angle of 10° degree. 8. The method as claimed in claim 1, wherein the control unit controls the laser unit such that at least one of the opening cuts, when viewed in a top view of the eye, has a geometrical shape of a circular ring segment. 9. The method as claimed in claim 8, wherein the control unit controls the laser unit such that opposite straight sides of the circular ring segment enclose an angle of between 30° degree and 120° degree. 10. The method as claimed in claim 8, wherein the control unit controls the laser unit such that opposite straight sides of the circular ring segment enclose an angle of between 45° degree and 80° degree. 11. The method as claimed in claim 8, wherein the control unit controls the laser unit such that the opposite straight sides of the circular ring segment have a length of between 0.1 mm and 1 mm. 12. The method as claimed in claim 8, wherein the control unit controls the laser unit such that the opposite straight sides of the circular ring segment have a length of between 0.2 mm and 0.4 mm. 13. The method as claimed in claim 1, wherein the control unit controls the laser unit such that a further cut surface is provided as a relieving cut, which extends from the anterior corneal surface into the cornea, but not up to the lenticle, the location and shape of the relieving cut being selected such that said relieving cut contributes to the correction of the ametropia of the eye. 14. The method as claimed in claim 1, wherein the control unit controls the laser unit such that at least one of the cut surfaces is generated as a perforated cut surface. 15. A method for generating cut surfaces in the cornea of an eye in order to correct ametropia, comprising: focusing a pulsed laser radiation into the cornea for generating cut surfaces in the cornea at a focus; and moving said focus within in said cornea such that a predetermined lenticle to be removed is separated from the surrounding corneal material in the cornea by at least one cut surface, and such that at least two mutually spaced apart cut surfaces are provided as opening cuts that are structured such that the lenticle or a portion thereof can be removed therethrough and that are structured such that the opening cuts do not lead to a corneal flap that can be folded back, each opening cut extending from the lenticle to an anterior corneal surface of said cornea, wherein the position and shape of each of the opening cuts is selected such that the opening cuts contribute to the correction of the ametropia of the eye, or do not counteract the correction of the ametropia of the eye being made. 16. The method as claimed in claim 15, wherein the position and shape of the opening cuts are selected such that the correction of the ametropia of the eye is counteracted and so that the opening cuts do not generate additional astigmatism of the eye. 17. The method as claimed in claim 15, wherein the ametropia to be corrected comprises an astigmatism of the eye. 18. The method as claimed in claim 15, wherein a position and a shape of each of the opening cuts is selected such that the opening cuts correct higher-order errors of refracting power of the cornea. 19. The method as claimed in claim 15, wherein at least three mutually spaced apart opening cuts are generated such that their centers of area of said opening cuts coincide with corners of a regular polygon. 20. The method as claimed in claim 15, wherein a cut length of at least one opening cut from the anterior corneal surface to the lenticle differs from cut lengths of the other opening cuts. 21. The method as claimed in claim 15, wherein exactly two mutually spaced apart opening cuts are generated such that centers of area of the opening cuts are located on a straight line which, when viewed in a top view of the eye, is parallel to an axis of astigmatism of the eye or intersects said axis at a maximum angle of 10.degree. 22. The method as claimed in claim 15, wherein at least one of the opening cuts, when viewed in a top view of the eye, has a geometrical shape of a circular ring segment. 23. The method as claimed in claim 22, wherein the at least one opening cut is carried out such that opposite straight sides of the circular ring segment enclose an angle of between 30° degree and 120° degree. 24. The method as claimed in claim 22, wherein the at least one opening cut is carried out such that opposite straight sides of the circular rings enclose an angle between 45° degree and 80° degree. 25. The method as claimed in claim 22, wherein the at least one opening cut is carried out such that the opposite straight sides of the circular ring segment have a length of between 0.1 mm and 1 mm. 26. The method as claimed in claim 22, wherein the at least one opening cut is carried out such that the opposite straight sides of the circular ring segment have a length of between 0.2 mm and 0.4 mm. 27. The method as claimed in claim 15, wherein a further cut surface is provided as a relieving cut, extending from the anterior corneal surface into the cornea, but not up to the lenticle, the position and shape of the relieving cut being selected such that it contributes to the correction of the ametropia of the eye. 28. The method as claimed in claim 15, wherein at least one of the cut surfaces is generated as a perforated cut surface. 29. The method as claimed in claim 15, wherein the lenticle is removed from the cornea through one of the opening cuts.