TW202210043A - Apparatus for treating ocular tissue - Google Patents

Abstract

The present invention relates to a method and an apparatus for treating an ocular tissue. The method for treating the ocular tissue includes generating a femtosecond laser beam from a laser source; orientating the femtosecond laser beam toward the ocular tissue; and defining a target area in the ocular tissue using the femtosecond laser beam, wherein the target area contains a sharp-edge part and a to-be-removed part, in which the sharp-edge part has a minimum thickness being gradually reduced to zero and is ablated by the femtosecond laser beam while the target area is defined; and removing the to-be-removed part of the target area from the ocular tissue.

Description

Method and apparatus for treating ocular tissue

The present invention relates to methods and apparatus for treating ocular tissue.

In order to achieve the purpose of correcting vision, there is a known method of using an excimer laser to change the curvature of the cornea of the eye, which may be called Laser Vision Correction (LVC). Among the laser vision correction methods, the most common is excimer laser in situ lamellar orthokeratology (LASIK), which accounts for approximately 85% of all laser vision correction methods.

In the early days of LASIK surgery, doctors usually used a physical blade (also known as a microkeratome) to cut a corneal flap on the cornea, then opened the corneal flap, and then used a laser to remove the exposed corneal tissue to change the cornea. radian. In recent years, regarding the method of incising the corneal flap on the cornea, a method using femtosecond laser has also been developed, which uses thousands of laser pulses to generate a photo-splitting effect to form extremely tiny point-like vacuoles. The tissue separates to form a corneal flap. This method of utilizing femtosecond lasers has been increasingly used in LASIK surgery as it offers greater safety, repeatability, predictability, and flexibility than microkeratotomy devices. to form a corneal flap. In addition, the use of femtosecond lasers can reduce the adverse complications of iatrogenic keratoconus (steep cornea), flap displacement (flat cornea), and irregular corneal flaps associated with microkeratotomy probability.

However, in LASIK surgery, due to the large incision of the corneal flap, it is difficult for the corneal flap to support the cornea to resist the strength of the intraocular pressure after the operation, thus greatly weakening the strength of the cornea after the operation.

In addition to LASIK surgery, another method of laser vision correction by femtosecond laser has been developed in recent years. A minimally invasive incision removes (removes) the corneal lens from the corneal tissue, thereby changing the curvature of the cornea. In this method, since there is no need to create a corneal flap with a larger incision, the problem of corneal flap displacement after surgery can be avoided, and the strength of the cornea will not be excessively weakened.

With regard to the method of removing (removing) a corneal lens, it is known to use a femtosecond laser to form a corneal lens by incising two planes in the intact corneal tissue, the two planes including an upper plane that follows the outer shape of the cornea ( called Cap) and a lower cut surface (called Curvature) with a higher curvature than the upper cut surface. Next, a femtosecond laser is used to make another incision at the outer periphery of the incision plane of the corneal lens to generate a minimally invasive incision through the corneal surface, so that the corneal lens can be taken out from the corneal tissue through the minimally invasive incision. As such, after removal of the corneal lens, the outer curvature of the cornea changes by the diopter necessary to correct the refractive error of the eye (correct visual acuity).

US Patent No. 10682256 discloses a technique for a method of removing a corneal lens, wherein, in order to avoid breakage of the corneal lens (especially the edge portion of the corneal lens) during removal from the corneal tissue, the upper cut surface of the corneal lens must be A compensation thickness is set between the lower section and the lower section to increase the strength of the edge portion of the corneal lens. However, as shown in Figures 5A and 5B, the method of compensating for the thickness DH between the upper and lower planes results in an increase in the thickness of the removed (removed) corneal lens, so that the total thickness of the remaining cornea after surgery It will become thinner and less conducive to the strength of the cornea against intraocular pressure.

The object of the present invention is to propose a method and apparatus for treating ocular tissue, which advantageously overcomes the aforementioned problems of the prior art, while maintaining the strength of the ocular tissue and avoiding the portion of the ocular tissue being removed (removed). Favorable technical effect of rupture.

A method of treating ocular tissue provided in accordance with the present invention includes generating a femtosecond laser beam from a laser light source; directing the femtosecond laser beam toward the ocular tissue; generating targeted treatment in the ocular tissue by the femtosecond laser beam area, wherein the target treatment area includes a sharp-edged portion and a portion to be removed, the sharp-edged portion may have a minimum thickness that tapers to a value of zero, and wherein the sharp-edged portion is generated during the target treatment area by femtosecond The laser beam is ablated; and the to-be-removed portion of the targeted treatment area is removed from the eye tissue.

With the method for treating eye tissue provided by the present invention, before removing the part to be removed in the target treatment area, the sharp edge portion of the target treatment area is ablated by the femtosecond laser beam, so that the target treatment area is Only the part to be removed needs to be removed from the eye tissue, and the part to be removed will not be broken during the process of being removed from the eye tissue, so the occurrence of damage in the eye tissue can be avoided. The removed (taken out) part is broken.

In addition, with the method for treating ocular tissue provided by the present invention, since there is no need to set an additional compensation thickness to avoid the problem of rupture of the removed (removed) part of the ocular tissue, according to the method for treating ocular tissue According to the actual requirements, the method for treating ocular tissue of the present invention can make the target treatment area generated have a corresponding thickness, and the minimum value of this thickness may be zero. In other words, the method for treating eye tissue of the present invention can avoid additionally increasing the thickness of the target treatment area required for treating (eg, correcting) the eye tissue, thereby achieving the purpose of maintaining the strength of the eye tissue to the greatest extent. .

In another aspect, an apparatus for treating ocular tissue provided according to the present invention includes a laser light source configured to generate a femtosecond laser beam; an optical system configured to guide the femtosecond laser beam generated by the laser light source; an optical system The scanning moving device is configured to apply the femtosecond laser beam from the optical system to the eye tissue through the condenser; the controller is connected with the laser light source, the optical system and the optical scanning moving device, and is configured to control the laser light source to generate the femtosecond laser beam. second laser beam; controlling the optical system to direct the femtosecond laser beam to the optical scanning moving device; and controlling the optical scanning moving device to generate a target treatment area in the eye tissue with the femtosecond laser beam, wherein the target treatment area includes a sharp an edge portion and a portion to be removed, the sharp edge portion may have a minimum thickness tapered to a value of zero, and wherein the sharp edge portion is ablated by the femtosecond laser beam during the creation of the target treatment area; and A removal device configured to remove the portion of the target treatment area to be removed from the ocular tissue under operation by the user.

With the device for treating eye tissue provided by the present invention, before the removing device removes the part to be removed from the target treatment area, the controller controls the optical scanning moving device to ablate the target by femtosecond laser beam. The sharp-edged part of the area, so that only the part to be removed in the target treatment area needs to be removed from the eye tissue, and this part to be removed will not be broken during the process of being removed from the eye tissue, so , the problem of rupture of the removed (removed) part of the eye tissue can be avoided.

In addition, with the device for treating eye tissue provided by the present invention, it is unnecessary to control the optical scanning moving device to set an additional compensation thickness on the target treatment area, so as to avoid the removal of the removing device when removing eye tissue ( The problem of rupture occurs during the process of taking out the part of the ocular tissue, according to the actual needs of treating ocular tissue, the controller of the device for treating ocular tissue of the present invention can control the optical scanning moving device so that the generated target treatment area has a corresponding value. thickness, and the minimum value of this thickness may be zero. In other words, the device for treating ocular tissue of the present invention can avoid additionally increasing the thickness of the target treatment area required for treating (eg, correcting) the ocular tissue, thereby achieving the purpose of maintaining the strength of the ocular tissue to the greatest extent. .

Embodiments of the present invention will hereinafter be described with reference to the accompanying drawings. In the following description, constituent elements having substantially the same function and arrangement are denoted by the same reference numerals, and repeated description is made only when necessary.

First, a method for treating ocular tissue according to an embodiment of the present invention will be described with reference to FIG. 1 . In the following description of the embodiments of the present invention, the cornea is used as an example of eye tissue for description. However, the eye tissue to which the method for treating eye tissue of the present invention is applicable is not limited thereto. For example, the method of treating ocular tissue according to the present invention can also be applied to ocular tissue such as a lens.

As shown in FIG. 1 , the method for treating eye tissue according to an embodiment of the present invention includes steps S101 to S104. First, in step S101, a femtosecond laser beam is generated from a laser light source. Next, in step S102, the femtosecond laser beam is directed toward the eye tissue. Next, in step S103 , target treatment areas T1 and T2 (see FIGS. 2A to 3B ) are generated in the eye tissue E by means of a femtosecond laser beam. The target treatment areas T1 and T2 include the sharp-edged portion TE and the portion to be moved. In addition to the portion TR, the sharp-edged portion TE may have a minimum thickness that tapers to a value of zero. More details about the target processing regions T1, T2 will be described later with reference to FIGS. 2A to 3B. Finally, in step S104, the to-be-removed portions TR of the target treatment regions T1, T2 are removed from the eye tissue E.

Examples of two target treatment regions T1 and T2 generated in the eye tissue E by the method for treating eye tissue according to an embodiment of the present invention will be described below with reference to FIGS. 2A to 3B .

2A and 2B show an example of a target treatment area T1 generated in the ocular tissue E by the method for treating ocular tissue according to an embodiment of the present invention.

Referring to FIGS. 2A and 2B , the target treatment area T1 generated in the ocular tissue E includes: firstly generating an undercut 1 in the ocular tissue E by a femtosecond laser beam, followed by ablation by the femtosecond laser beam The sharp-edged portion TE of the target treatment area T1 and finally the upper slice 2 connected to the lower slice 1 are generated in the eye tissue E by a femtosecond laser beam. After the target processing region T1 is processed in this way, the sharp-edged portion TE of the target processing region T1 has been ablated by the femtosecond laser beam to form bubbles, and only the to-be-removed portion TR remains.

In the example shown in FIGS. 2A and 2B , the upper tangent plane 2 and the lower tangent plane 1 generated by the femtosecond laser beam are connected to each other at the outer periphery of the lower tangent plane 1 , and thus, the sharp-edged portion TE of the target treatment area T1 includes The upper cut surface 2 and the lower cut surface 1 are connected to each other at the outer periphery of the lower cut surface 1 .

In addition, in order to remove the to-be-removed portion TR of the target treatment region T1 from the ocular tissue E, the method for treating ocular tissue according to an embodiment of the present invention further comprises using a femtosecond laser beam in the ocular tissue E The removal incision 4 is made, which is located at the outer periphery of the upper section 2 and is connected to the upper section 2 from the outer surface of the ocular tissue E, and therefore, the removal incision 4 also corresponds to the target treatment area T1 connect. In this way, the to-be-removed portion TR of the target treatment region T1 can be removed from the eye tissue E via the removal incision 4 .

After the to-be-removed portion TR of the target treatment region T1 shown in FIGS. 2A and 2B is removed from the ocular tissue E, the outer curvature of the ocular tissue E (ie, the cornea in this embodiment) is changed ( For example, it becomes more flat), thus achieving the purpose of changing the curvature of the cornea to correct vision. In other words, the target treatment area T1 shown in FIGS. 2A and 2B is an example of a target treatment area that needs to be removed from the cornea in order to correct myopia.

3A and 3B illustrate another example of a target treatment area T2 generated in the ocular tissue E by the method for treating ocular tissue according to an embodiment of the present invention.

3A and 3B, the target treatment area T2 is generated in the eye tissue E in a similar manner to the target treatment area T1 shown in FIGS. 2A and 2B, the difference between the two is that in FIGS. 3A and 2B In the example shown in 3B, the lower section 1 generated by the femtosecond laser beam first has a shape similar to W, and therefore, the upper section 2 and the lower section 1 generated by the femtosecond laser beam are in addition to the lower section. In addition to the outer peripheral edge of the cutting plane 1, the parts close to the central axis O are also connected to each other (refer to FIG. 3B ), and therefore, the sharp edge portion TE of the target treatment area T2 includes the upper cutting plane 2 and the lower cutting plane 1 at the outer circumference of the lower cutting plane 1 The edge, and the interconnection of the parts close to the central axis O. More specifically, the sharp-edged portion TE of the target processing area T2 also includes the turning points on both sides of the cut plane 1 under the W shape. These sharp-edged portions TE of the target processing region T2 are all ablated by the femtosecond laser beam to be bubbled.

Furthermore, in order to remove the to-be-removed portion TR of the target treatment region T2 from the eye tissue E, similar to the above-explained removal of the to-be-removed portion TR of the target treatment region T1 from the eye tissue E, according to the present invention The method of treating eye tissue according to the embodiment further comprises making a removal incision 4 in the eye tissue E by means of a femtosecond laser beam, the removal incision 4 being located at the outer periphery of the upper cut plane 2 and extending from the eye. The outer surface of the tissue E is connected to the upper cut plane 2, and therefore, the removal incision 4 is also connected to the target treatment area T2. In this way, the to-be-removed portion TR of the target treatment area T2 can be removed from the eye tissue E via the removal incision 4 .

However, in the example shown in FIGS. 3A and 3B , since the upper cut surface 2 and the lower cut surface 1 of the target treatment area T2 are connected to each other at a portion close to the central axis O except at the outer periphery of the lower cut surface 1 (refer to FIG. 3B ) ), when viewed from the direction of the front view schematic diagram of FIG. 3A , the target treatment area T2 has a doughnut-like shape. In this case, if the to-be-removed portion TR of the target treatment region T2 is to be removed through the removal incision 4, it is necessary to additionally ablate the cut surface 8 in the eye tissue E by a femtosecond laser beam ( 3A), this cut surface 8 connects the upper cut surface 2 of the target treatment area T2 and the lower cut surface 1 at the outer periphery of the lower cut surface 1 and the part close to the central axis O. Connect to each other, and run through the target treatment area T2, So that the target treatment area T2 is divided by the cut surface 8 , so that the to-be-removed portion TR of the target treatment area T2 can be easily removed from the removal cut 4 .

In order to further facilitate the removal of the to-be-removed portion TR of the target treatment area T2 from the removal incision 4, it is preferable that the removal incision 4 and the cut surface 8 are located at the center axis O relative to the target treatment area T2. On the opposite side, so that the to-be-removed portion TR of the target processing region T2 can be uniformly removed from the removal cut 4 .

After the to-be-removed portion TR of the target treatment region T2 shown in FIGS. 3A and 3B is removed from the ocular tissue E, the outer curvature of the ocular tissue E (ie, the cornea in this embodiment) is changed ( For example, it becomes more bulging), thus achieving the purpose of changing the curvature of the cornea to correct vision. In other words, the target treatment area T2 shown in FIGS. 3A and 3B is an example of a target treatment area that needs to be removed from the cornea in order to correct hyperopia.

It can be clearly understood from the above descriptions with reference to FIGS. 2A to 3B for examples of target treatment regions T1, T2 generated in the ocular tissue E by the method for treating ocular tissue according to the embodiment of the present invention. Before removing the to-be-removed parts TR of the target processing areas T1 and T2, the sharp-edged parts TE of the target processing areas T1 and T2 have been ablated by a femtosecond laser beam, leaving only the to-be-removed parts of the target processing areas T1 and T2. The part TR is removed, and in the process of removing the target treatment areas T1 and T2 of the ocular tissue E, the part TR to be removed is less likely to be broken. Therefore, the method of treating ocular tissue according to the present invention can indeed effectively avoid rupture of the portion of the removed ocular tissue (eg, cornea) (ie, the target treatment area T1, T2) during the removal process. problem occurs.

In addition, since in the method for treating ocular tissue according to the present invention, the part of the ocular tissue (eg, the cornea) to be removed does not rupture during the removal process, compared to the previous Technology By setting an additional compensation thickness for the target treatment area to avoid the problem of rupture during removal, the method for treating eye tissue of the present invention does not require additional compensation thickness for the target treatment area. Therefore, according to the treatment According to the actual needs of eye tissue, the method for treating eye tissue of the present invention can generate a target treatment area with a corresponding thickness, and the minimum value of the thickness may be zero. In other words, the method for treating ocular tissue of the present invention can avoid additionally increasing the thickness of the target treatment area (eg, the compensation thickness in the prior art) necessary to treat (eg, correct) the ocular tissue, thereby maximizing the thickness of the target treatment area. To achieve the purpose of maintaining the strength of the eye tissue.

On the other hand, since the method for treating ocular tissue according to the present invention can generate a target treatment area with a corresponding thickness without setting a compensation thickness, it can more accurately determine what is necessary to treat (eg, correct) the ocular tissue The range of the target processing area makes its processable range (for example, correctable visual acuity) wider. For example, for vision correction, if the maximum thickness of the removed target treatment area that the cornea can bear is DA, since the prior art must additionally set a compensation thickness DH for the removed target treatment area, the range of visual acuity that can be corrected is: The maximum thickness corresponds to the range of DA-DH (the maximum thickness of the target treatment area that the cornea can withstand for removal minus the compensation thickness). It can correct the visual acuity range of the maximum thickness equivalent to DA (the maximum thickness of the target treatment area that the cornea can bear to remove).

FIG. 4 shows a schematic diagram of an apparatus 100 for treating ocular tissue according to an embodiment of the present invention.

The apparatus 100 for treating eye tissue according to an embodiment of the present invention includes a laser light source 101 configured to generate a femtosecond laser beam; an optical system 102 configured to guide the femtosecond laser beam generated by the laser light source 101; The optical scanning moving device 103 is configured to apply the femtosecond laser beam from the optical system 102 to the eye tissue E through the condenser 104 ; and the controller 105 is connected with the laser light source 101 , the optical system 102 and the optical scanning moving device 103 , and is configured to control the laser light source 101 , the optical system 102 and the optical scanning moving device 103 to generate target treatment areas T1 , T2 in the eye tissue E (see FIGS. 2A to 3B ). The apparatus 100 for treating eye tissue according to an embodiment of the present invention further includes a removing device (not shown in the figure), which is configured to remove the target treatment area T1, T2 from the eye tissue E under the operation of the user. The portion TR to be removed (see FIGS. 2A to 3B ).

Specifically, the controller 105 is configured to control the laser light source 101 to generate a femtosecond laser beam, control the optical system 102 to direct the femtosecond laser beam to the optical scanning moving device 103 , and control the optical scanning moving device 103 to use the femtosecond laser beam The laser beam passes through the condenser 104 to generate target treatment areas T1 and T2 in the eye tissue E. The target treatment areas T1 and T2 include a sharp edge portion TE and a to-be-removed portion TR. The sharp edge portion TE may have a taper to a value of zero. , and the sharp-edged portion TE is ablated by the femtosecond laser beam during the generation of the target processing regions T1, T2.

For more details on how the controller 105 generates the target treatment regions T1 and T2 in the eye tissue E, reference may be made to the foregoing descriptions of FIGS. 2A to 3B , which will not be repeated here.

Likewise, in the apparatus 100 for treating eye tissue according to the present invention, since the removal device (not shown in the figure) removes the to-be-removed portion TR of the target treatment area T1, T2, the controller 105 controls the The optical scanning moving device 103 ablates the sharp edge portions TE of the target processing regions T1 and T2 by a femtosecond laser beam, so that only the to-be-removed portion TR remains in the target processing regions T1 and T2, and this to-be-removed portion TR Ruptures are less likely to occur during the removal of the target treatment areas T1 , T2 of the ocular tissue E. Therefore, the device for treating ocular tissue according to the present invention can indeed effectively avoid rupture of the portion of the removed ocular tissue (eg, the cornea) (ie, the target treatment area T1, T2) during the removal process. problem occurs.

In addition, since in the apparatus 100 for treating ocular tissue according to the present invention, the removed part of the ocular tissue E (eg, the cornea) does not have the problem of rupture during the removal by the removing device, the Compared with the prior art by setting an additional compensation thickness for the target treatment area to avoid the problem of rupture during removal, the device for treating ocular tissue of the present invention does not need to set an additional compensation thickness for the target treatment area, so , according to the actual needs of treating eye tissue, the controller of the device for treating eye tissue of the present invention can control the optical scanning moving device so that the generated target treatment area has a corresponding thickness, and the minimum value of the thickness may be zero. In other words, the device for treating ocular tissue of the present invention can avoid additionally increasing the thickness of the target treatment area (eg, the compensation thickness in the prior art) necessary for treating (eg, correcting) the ocular tissue, thereby maximizing the thickness To achieve the purpose of maintaining the strength of the eye tissue.

On the other hand, also, since the device 100 for treating ocular tissue according to the present invention can generate a target treatment area with a corresponding thickness without setting a compensation thickness, it can more accurately decide to treat (eg, correct) the eye The scope of the target treatment area necessary for the external tissue makes the scope of its treatment (eg, the corrective power of vision) wider. This advantage has been described in detail above, and will not be repeated here.

The drawings of the embodiments described herein are intended to provide an understanding of the invention. In other words, the drawings are representative only and may not be drawn to scale. Some scales in the drawings may be exaggerated while other scales may be reduced. Accordingly, the drawings are to be regarded as illustrative rather than restrictive.

Although various embodiments of the present invention have been described in the above-mentioned embodiments with reference to the accompanying drawings, the above-mentioned embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention to the above-mentioned descriptions and those shown in the accompanying drawings. features and structure shown. It should be understood that various other omissions, substitutions, changes and modifications that can be conceived by those skilled in the art without departing from the scope of the invention are also included within the scope of the invention.

1: lower section 2: top section 4: Remove the incision 8: cut surface 100: Devices for Treating Eye Tissue 101: Laser light source 102: Optical system 103: Optical scanning mobile device 104: Condenser 105: Controller DH: compensated thickness E: eye tissue O: center axis S101~S104: Steps T1, T2: target processing area TE: Sharp edge part TR: section to be removed

A more complete understanding of the present invention and its many attendant advantages will become readily understood with reference to the following detailed description, especially when considered in conjunction with the accompanying drawings, wherein:

1 is a flowchart of a method for treating ocular tissue according to an embodiment of the present invention;

2A is a schematic front view of a target treatment area generated in the eye tissue by the method for treating eye tissue according to an embodiment of the present invention;

2B is a schematic cross-sectional view taken along line II-II of FIG. 2A;

3A is a schematic front view of another target treatment area generated in the eye tissue by the method for treating eye tissue according to an embodiment of the present invention;

3B is a schematic cross-sectional view taken along line III-III of FIG. 3A;

4 is a schematic diagram of an apparatus for treating ocular tissue according to an embodiment of the present invention; and

5A and 5B are schematic cross-sectional views of the creation of a corneal lens in the cornea according to the prior art.

S101~S104: Steps

Claims (18)

A method of treating eye tissue, comprising: Generate a femtosecond laser beam from a laser light source; directing the femtosecond laser beam towards the eye tissue; generating a target treatment area in the eye tissue by the femtosecond laser beam, wherein the target treatment area includes a sharp-edged portion and a portion to be removed, the sharp-edged portion may have a minimum thickness tapered to a value of zero , and wherein the sharp-edged portion is ablated by the femtosecond laser beam during the generation of the target treatment area; and the to-be-removed portion of the target treatment area is removed from the eye tissue. The method of treating ocular tissue of claim 1, further comprising: prior to removing the portion to be removed of the target treatment region from the ocular tissue, applying the femtosecond laser beam to the ocular tissue The removal incision is made in the wherein the removal incision is connected to the target treatment area from the outer surface of the ocular tissue, and Wherein, the to-be-removed portion of the target treatment area is removed from the ocular tissue via the removal incision. The method for treating eye tissue as claimed in claim 1, wherein generating the target treatment area in the eye tissue by the femtosecond laser beam comprises: producing a lower section in the ocular tissue; ablating the sharp-edged portion of the target treatment area by the femtosecond laser beam; and An upper section connected to the lower section is created in the ocular tissue. The method for treating eye tissue as claimed in claim 3, wherein the upper cut surface and the lower cut surface are connected to each other at the outer periphery of the lower cut surface; and Wherein, the sharp-edged portion of the target treatment area includes the interconnection of the upper cut surface and the lower cut surface at the outer periphery of the lower cut surface. The method of treating eye tissue as described in claim 4, further comprising: making a removal incision in the ocular tissue by the femtosecond laser beam before removing the portion to be removed of the target treatment area from the ocular tissue, wherein the removal incision is connected to the target treatment area from the outer surface of the ocular tissue, and Wherein, the to-be-removed portion of the target treatment area is removed from the ocular tissue via the removal incision. The method for treating eye tissue according to claim 3, wherein the upper cut surface and the lower cut surface are connected to each other at the outer periphery of the lower cut surface and a portion close to the central axis; Wherein, the sharp-edged portion of the target treatment area includes the connection between the outer peripheral edge of the upper cut surface and the lower cut surface at the lower cut surface, and the portion close to the central axis; and Wherein, generating the target treatment area in the eye tissue by the femtosecond laser beam further includes ablating a cut surface, the cut surface connecting the upper cut surface and the lower cut surface at the outer periphery of the lower cut surface The edge and the interconnection between the portion near the central axis and through the target treatment area. The method of treating eye tissue as described in claim 6, further comprising: making a removal incision in the ocular tissue by the femtosecond laser beam before removing the portion to be removed of the target treatment area from the ocular tissue, wherein the removal incision is connected to the target treatment area from the outer surface of the ocular tissue, and Wherein, the to-be-removed portion of the target treatment area is removed from the ocular tissue via the removal incision. The method for treating ocular tissue as claimed in claim 7, wherein the cut surface is located on the opposite side of the removal incision with respect to the central axis of the target treatment area. The method for treating ocular tissue according to claim 1, wherein the ocular tissue is the cornea or the lens. A device for treating ocular tissue, comprising: a laser light source, configured to generate a femtosecond laser beam; an optical system configured to guide the femtosecond laser beam generated by the laser light source; an optical scanning movement device configured to apply the femtosecond laser beam from the optical system to ocular tissue through a condenser; a controller, connected with the laser light source, the optical system and the optical scanning moving device, and configured to controlling the laser light source to generate the femtosecond laser beam; controlling the optical system to direct the femtosecond laser beam to the optical scanning moving device; and Controlling the optical scanning moving device to generate a target treatment area in the eye tissue with the femtosecond laser beam, wherein the target treatment area includes a sharp edge portion and a to-be-removed portion, and the sharp edge portion may have a tapered value a minimum thickness of zero, and wherein the sharp-edged portion is ablated by the femtosecond laser beam during creation of the target treatment region; and A removal device configured to remove the portion to be removed of the target treatment area from the ocular tissue under user operation. The apparatus for treating ocular tissue of claim 10, wherein the controller is further configured to control the optics before the removal device removes the portion to be removed of the target treatment area from the ocular tissue a scanning movement device makes a removal incision in the ocular tissue with the femtosecond laser beam connecting from the outer surface of the ocular tissue to the target treatment area, and Wherein, the removal device is configured to remove the to-be-removed portion of the target treatment area from the ocular tissue through the removal incision under the operation of the user. The apparatus for treating eye tissue as claimed in claim 10, wherein the controller controls the optical scanning moving device to generate the target treatment area in the eye tissue with the femtosecond laser beam comprising: producing a lower section in the ocular tissue; ablating the sharp-edged portion of the target treatment area; and An upper section connected to the lower section is created in the ocular tissue. The apparatus for treating ocular tissue of claim 12, wherein the upper cut surface and the lower cut surface are connected to each other at the outer periphery of the lower cut surface; and Wherein, the sharp-edged portion of the target treatment area includes a place where the upper cut surface and the lower cut surface are connected to each other at the outer peripheral edge of the lower cut surface. The apparatus for treating ocular tissue of claim 13, wherein the controller is further configured to control the optics before the removal device removes the portion to be removed of the target treatment area from the ocular tissue a scanning movement device makes a removal incision in the ocular tissue with the femtosecond laser beam connecting from the outer surface of the ocular tissue to the target treatment area, and Wherein, the removal device is configured to remove the to-be-removed portion of the target treatment area from the ocular tissue through the removal incision under the operation of the user. The device for treating eye tissue as claimed in claim 12, wherein the upper cut surface and the lower cut surface are connected to each other at the outer periphery of the lower cut surface and a portion close to the central axis; Wherein, the sharp-edged portion of the target treatment area includes the connection between the outer peripheral edge of the upper cut surface and the lower cut surface at the lower cut surface, and the portion close to the central axis; and Wherein, the controller controls the optical scanning moving device to generate the target treatment area in the eye tissue with the femtosecond laser beam, and further includes ablating a cut surface, and the cut surface connects the upper cut surface and the lower cut surface It is at the interconnection between the outer peripheral edge of the lower cut surface and the portion close to the central axis, and runs through the target treatment area. The apparatus for treating ocular tissue of claim 15, wherein the controller is further configured to control the optics before the removal device removes the portion to be removed of the target treatment area from the ocular tissue a scanning movement device makes a removal incision in the ocular tissue with the femtosecond laser beam connecting from the outer surface of the ocular tissue to the target treatment area, and Wherein, the removal device is configured to remove the to-be-removed portion of the target treatment area from the ocular tissue through the removal incision under the operation of the user. The apparatus for treating ocular tissue of claim 16, wherein the cut surface is located on the opposite side of the removal incision relative to the central axis of the target treatment area. The device for treating ocular tissue as claimed in claim 10, wherein the ocular tissue is a cornea or a lens.

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