An ocular axis marker

Abstract

The application discloses an eye axis position marker, which comprises a marker body, a dial and a base, the marker body and the dial are arranged on the base, the marker body comprises a marking ring and a ring structure which are arranged concentrically and can rotate relatively, the marking ring is provided with marking heads which are distributed radially symmetrically; the marker body further comprises a positioning component which can limit the relative rotation of the marking ring and the ring structure; the dial drives the ring structure or the marking ring to rotate when the dial rotates. The marker body is used for determining the axis position on the dial outside the patient, the dial is not limited by the size of the eyeball of the patient and can be set to a large size, so that the accurate marking of the scale can be easily realized, and the error of the operation is reduced. Moreover, the axis position marker further comprises the positioning component for limiting the relative rotation of the marking ring and the ring structure, so that the determined axis position will not be deviated during the operation process, and the accuracy of the axis position marking during the operation is ensured.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and more specifically to an eye axis marker. Background Technology

[0002] Cataracts are the leading cause of blindness worldwide. Phacoemulsification cataract extraction combined with intraocular lens implantation is currently the primary treatment for cataracts. The intraocular lens (IOL) is an optical lens that replaces the cloudy lens. The surgery involves using phacoemulsification to remove the cloudy lens nucleus and cortex, preserving the lens capsule, and then implanting the IOL within the capsule. Corneal astigmatism is a significant factor contributing to poor postoperative vision in cataract patients, significantly affecting visual quality after cataract extraction. Currently, the main methods for correcting astigmatism in cataract patients include postoperative contact lenses, excimer laser surgery, creating a main surgical incision on the steep corneal axis or performing a limbal release incision, and using astigmatically corrective IOLs. Among these, astigmatically corrective IOLs are relatively widely used clinically and have proven effective. However, accurate axis fixation after implantation of the astigmatically corrective IOL is crucial. Every 1° of IOL rotation results in a 3.3% undercorrection of astigmatism, and rotations exceeding 30° will introduce additional astigmatism. To ensure accurate axis alignment after implantation of an astigmatic corrective intraocular lens, it is crucial to accurately mark and confirm the horizontal or astigmatic axis of the patient's operated eye before and during surgery.

[0003] During astigmatism-correcting intraocular lens implantation, to avoid the influence of eyeball rotation in the supine position (maximum rotation of about 10°), the traditional method involves the surgeon manually marking the position with a marker under a slit-lamp microscope while the patient is seated before surgery. The slit-lamp microscope is first adjusted to a horizontal position and its narrowest setting, ensuring the light band passes through the center of the pupil. The marker is then used to mark the horizontal position at the corneal limbus. During surgery, the astigmatic axis is further determined using a graduated circular astigmatism marking disc, referencing the marked 0° position. However, because the corneal diameter is only about 10mm, existing intraoperative astigmatism marking discs of this size cannot achieve precise marking, generally only accurate to 5–10°, leading to significant surgical errors. Summary of the Invention

[0004] This application provides an eye axis marker that can reduce the error in axis determination during surgery.

[0005] The eye axis marker provided in this application includes a marker body, a scale, and a base. The marker body and the scale are placed on the base. The marker body includes a marker ring and a ring structure that are concentrically arranged and rotatable relative to each other. The marker ring is provided with marker heads that are radially symmetrically distributed. The marker body also includes a positioning component that can restrict the relative rotation of the marker ring and the ring structure. When the scale rotates, it drives the ring structure or the marker ring to rotate.

[0006] In one specific embodiment, the ring structure has an annular groove, and the marking ring is placed in the annular groove; or, the ring structure has a plurality of limiting parts arranged circumferentially, and the plurality of limiting parts surround the outer periphery of the marking ring to radially limit the marking ring.

[0007] In one specific embodiment, the ring structure has a first marking portion arranged symmetrically in the radial direction.

[0008] In one specific embodiment, the first marking portion is a marking line, notch, recess, or protrusion provided on the upper surface of the marking ring.

[0009] In one specific embodiment, the positioning component is a gripping part, which includes a rod-shaped body and a screw. The rod-shaped body is fixed or integrally formed with the ring structure, and the screw is threadedly connected to the rod-shaped body, so as to abut against or move away from the marking ring by rotating the screw thread.

[0010] In one specific embodiment, the dial is provided with a through hole, the marking ring and the ring structure are located in the through hole, the hole wall of the through hole is provided with a relief recess, the rod-shaped body is provided on the outer periphery of the ring structure, the relief recess avoids the rod-shaped body, and when the dial rotates, it drives the grip and the ring structure to rotate.

[0011] In one specific embodiment, the dial is provided with a through hole, the marking ring and the ring structure are located in the through hole, the base includes a base body, the middle of the base body is provided with a boss, the boss is located in the through hole, and the marking ring and the ring structure are located between the hole wall of the through hole and the boss.

[0012] In one specific embodiment, the boss has a groove structure, and the marking head is inserted into the groove structure.

[0013] In one specific embodiment, the base is provided with a second marking portion that is radially symmetrically distributed, and the second marking portion and the groove structure are distributed radially.

[0014] In one specific embodiment, the base body has radially symmetrically arranged and arc-shaped limiting protrusions, and the second marking portion is disposed on the upper surface of the limiting protrusions.

[0015] In one specific embodiment, the marking head is an integral structure formed together with the marking ring; or, the marking head includes a root and an end rotatably connected to the root.

[0016] In one specific embodiment, the end is an arc-shaped piece, a flat piece, or a hollow structure.

[0017] The ocular axis marker provided in this application allows the marker body to determine the axis on a dial and base before implanting an astigmatic correction intraocular lens. During surgery, the axis determined by the marker body is then used for marking. At this time, the axis is determined on a dial outside the patient's eye. The dial size is not limited by the size of the patient's eyeball and can be set to a larger size, making it easier to achieve precise marking (accuracy can be controlled to 1 degree or 0.5 degrees, or even smaller), thus reducing surgical errors. Furthermore, the axis marker includes a positioning component that restricts the relative rotation of the marking ring and the ring structure, ensuring that the determined axis does not shift during surgery, guaranteeing the accuracy of the axis marking. This ocular axis marker can also be used multiple times, reducing surgical costs. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the eye axis marker in the first embodiment of this application;

[0019] Figure 2 for Figure 1 A schematic diagram of the main body of the marker;

[0020] Figure 3 for Figure 2 A schematic diagram of the ring structure and gripping part of the main body of the marker;

[0021] Figure 4 for Figure 2 A schematic diagram of the marking ring of the main body of the marker;

[0022] Figure 5 for Figure 1 A schematic diagram showing the assembled center dial and base;

[0023] Figure 6 for Figure 5 A schematic diagram of the middle dial;

[0024] Figure 7 for Figure 5 A schematic diagram of the central base;

[0025] Figure 8 This is a schematic diagram of one structure of the marking ring in an embodiment of this application;

[0026] Figure 9 for Figure 8 A schematic diagram of the Chinese marker header;

[0027] Figure 10 for Figure 8 A diagram showing the center marker being moved above the root.

[0028] Figure 11 This is a schematic diagram of another structure of the marking ring in an embodiment of this application;

[0029] Figure 12 for Figure 11 A schematic diagram of the Chinese marker header;

[0030] Figure 13 This is a schematic diagram of another structure of the marking ring in the embodiments of this application;

[0031] Figure 14 This is a view of the marker body of the eye axis marker in the second embodiment of this application;

[0032] Figure 15 for Figure 14 A schematic diagram of the central ring structure and the gripping part.

[0033] Figure 1-15 The annotations in the attached figures are explained as follows:

[0034] 1-Tag body;

[0035] 11-Marking ring; 111-Ring-shaped body; 112, 112', 112”, 112”'-Marking head; 112a-Root; 112b-Rotating part; 112c-Arc-shaped piece; 112d-Hollow structure; 112e-End;

[0036] 12, 12' - Ring structure; 121 - Annular groove; 122, 122' - First marking part; 123 - Notch; 123' - Limiting rod;

[0037] 13-Grip part; 131-Rod-shaped body; 132-Screw;

[0038] 2-Dial; 21-Scale line; 22-Through hole; 23-Allowing recess;

[0039] 3-Base; 31-Base body; 32-Limiting protrusion; 321-Second marking part; 33-Boss; 331-Straight groove. Detailed Implementation

[0040] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0041] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the eye axis marker in the first embodiment of this application. The eye axis marker in this embodiment includes a base 3, a dial 2, and a marker body 1. The structure of each part is described below.

[0042] Please continue to refer to this. Figure 2-4 , Figure 2 for Figure 1 A schematic diagram of the main body 1 of the marker; Figure 3 for Figure 2 A schematic diagram of the ring structure 12 and the gripping part 13 of the marker body 1; Figure 4 for Figure 2 A schematic diagram of the marking ring 11 of the marker body 1. The marker body 1 includes a marking ring 11 arranged concentrically and rotatable relative to each other and a ring structure 12.

[0043] like Figure 4 As shown, the marking ring 11 includes an annular body 111 and a marking head 112 disposed on the annular body 111. The marking head 112 can be coated with marking paint to mark the axis of the eye on the eyeball. The annular body 111 is circular, and two marking heads 112 are symmetrically distributed radially on the annular body 111. The marking head 112 and the annular body 111 can be separately fixed or integrally disposed; this embodiment does not impose any limitations.

[0044] like Figure 3 As shown, the ring structure 12 is also a circular ring structure, and it is also provided with an annular groove 121. The annular groove 121 is concentric with the ring structure 12. The aforementioned marking ring 11 can be accommodated in the annular groove 121 and can rotate freely in the annular groove 121. In addition, the upper end face of the ring structure 12 is divided by the annular groove 121 to form an inner annular end face and an outer annular end face. The inner annular end face can be provided with two first marking portions 121 that are 180 degrees apart. The first marking portions 121 can be scale lines, and the two scale lines are radially symmetrically arranged. Alternatively, the first marking portions 121 can also be radially symmetrical notches, recesses, protrusions, or other structures.

[0045] Let's look again. Figure 2 , 3The marker body 1 also includes a positioning component, which is used to position the marking ring 11 and the ring structure 12 to limit their relative rotation. In this embodiment, the positioning component is specifically a gripping part 13, which includes a rod-shaped body 131 and a screw 132. The rod-shaped body 131 is located on one side of the ring structure 12 and has a threaded hole extending along its length. The screw 132 is inserted into the threaded hole. A knob for easy operation can be provided at the end of the screw 132 away from the ring structure 12. When the operator rotates the knob, the screw 132 rotates threadedly, thereby moving axially along the threaded hole, so that its other end extends out of the threaded hole and approaches the ring structure 12 or rotates in the opposite direction and moves away from the ring structure 12.

[0046] Figure 2 As can be seen, the outer end face of the ring structure 12 has a notch that connects to the annular groove 121. When the screw 132 is rotated to extend out of the threaded hole, the screw 132 can be inserted into the notch and reach the position of the annular groove 121. Thus, when the marking ring 11 is placed in the annular groove 121, the screw 132 can press against the surface of the marking ring 11, thereby fixing the position of the marking ring 11 relative to the ring structure 12. It can be seen that the positioning component is not limited to the structure of the gripping part 13. For example, the positioning component may include an elastic element and a clamping element. The elastic element presses against the clamping element to press against the ring structure 12 and the marking ring 11. The elastic force can be overcome to release the pressure. After the ring structure 12 and the marking ring 11 are rotated relative to each other to the desired position, the external force is removed, and the clamping element can press against the ring structure 12 and the marking ring 11 again.

[0047] Please continue reading. Figure 5-7 , Figure 5 for Figure 1 A schematic diagram of the assembled middle dial 2 and base 3; Figure 6 for Figure 5 A schematic diagram of the middle dial 2; Figure 7 for Figure 5 A schematic diagram of the middle base 3.

[0048] The dial 2 is a disc with a through hole 22 in the center. The outer edge of its upper surface is provided with 360-degree scale lines 21 arranged in a ring. The dial 2 can be set as a disc with a large diameter, such as a disc with a diameter of about 10cm or larger. Because the dial 2 is large enough, the accuracy of the scale can be set to 1 degree or 0.5 degrees, or other more precise accuracy.

[0049] The base 3 includes a disc-shaped base body 31, a cylindrical boss 33 in the center of the base body 31, and an upwardly extending limiting protrusion 32 on the edge of the base body 31. The limiting protrusion 32 can be... Figure 7The arc-shaped protrusion shown is concentrically arranged with the base body 31 and the boss 33. The base 3 includes two radially symmetrically arranged arc-shaped protrusions, and a second marking portion 321 is provided in the middle of the two arc-shaped protrusions. The second marking portion 321 can be... Figure 7 As shown in the scale lines, the two scale lines are set at 180 degrees, indicating that the second marking part 321 can also be other easily identifiable structures such as notches, recesses, or protrusions. Furthermore, the boss 33 has a groove structure into which the marking head 112 can be inserted. In this embodiment, the groove structure is a straight groove 331, which radially penetrates the outer peripheral wall of the boss 33, with the groove opening facing upwards, thus also penetrating the upper surface of the boss 33. The straight groove 331 and the two scale lines serving as the second marking part 321 are on a straight line. Therefore, when the marking head 112 is inserted into the straight groove 331, it indicates that the marking head 112 and the second marking part 321 are radially aligned. Since the second marking part 321 is located at the edge of the base body 31, it is easy to align with the scale lines of the dial 2, making it easy to adjust the initial angular position of the marking head 112 relative to the dial 2.

[0050] It can be seen that the groove structure is not limited to a straight groove 331; two grooves can also be set separately on the boss 33. Alternatively, the boss 33 can be omitted. For example, two radially symmetrically distributed protrusions can be directly set on the base body 31 to align with the marking head 112. Here, the boss 33 is set to facilitate the insertion and alignment of the marking head 112, and can also radially limit the marking body 1 and the dial. The base 3 is not limited to setting the limiting protrusion 32; it can be omitted. The second marking part 321 can be directly marked on the upper end face of the base body 31, or the scale line 21 of the dial 2 can extend to the inner edge of the through hole 22 of the dial 2, which also facilitates the alignment and identification of the angle of the marking ring 11 or the ring structure 12.

[0051] like Figure 5 As shown, the dial 2 can be placed on the base body 31. The boss 33 restricts the radial movement of the dial 2. The through hole 22 of the dial 2 avoids the boss 33 of the base 3, and an annular receiving groove is formed between the hole wall of the through hole 22 and the outer peripheral wall of the boss 33. The ring structure 12 and the marking ring 11 of the marker body 1 can be placed in the receiving groove after assembly. The marking head 112 of the marking ring 11 can be inserted into the straight groove 331 of the boss 33 of the base 3.

[0052] like Figure 2 As shown, the gripping part 13 of the marker body 1 is located on the outside of the ring structure 12, and then combined with... Figure 1 , 5It is understood that the dial 2 can be provided with a relief recess 23, which communicates with the through hole 22. The relief recess 23 can be a notch or a groove structure, etc. When the marker body 1 is placed in the receiving groove, the relief recess 23 can accommodate the bottom end of the grip part 13, specifically the rod-shaped body 131 of the grip part 13. Of course, the bottom end of the grip part 13 can also be set on the ring structure 12, so the dial 2 does not need to be provided with a relief recess 23. However, setting the grip part 13 on one side of the ring structure 12 makes it easier to fix in space. Moreover, with this setting, when the dial 2 rotates, the wall of the relief recess 23 interferes with the grip part 13, thereby driving the grip part 13 to rotate, and then driving the ring structure 12 to rotate relative to the marking ring 11.

[0053] When using this method, for example, if you want to find the axis of the eyeball at an angle 'a' during surgery, where 'a' is, for example, 91°, you can do so as follows:

[0054] First, mark the 0 / 180° horizontal position of the eyeball while the patient is sitting. Then, the patient enters the operating room and lies flat.

[0055] The operator or assistant holds the grip part 13 of the marker body 1, rotates the knob at the upper end of the screw 132 away from the ring structure 12, and places the marker ring 11 into the annular groove 121 of the ring structure 12, so that the two marker heads 112 of the marker ring 11 are aligned with the two first marker parts 122 of the ring structure 12. This is the initial position of the marker ring 11 relative to the ring structure 12, and the two marker heads 112 and the first marker parts 122 are in the same straight line.

[0056] Place the dial 2 on the base body 31 of the base 3 and align the 0 / 180° scale line of the dial 2 with the scale line of the two limiting protrusions 32 that serve as the second marking part 321. At this time, the 0 / 180° scale line of the dial 2, the scale line of the limiting protrusions 32, and the straight groove 331 of the boss 33 are in a straight line.

[0057] The marker body 1 is embedded in the receiving groove between the dial 2 and the boss 33, and the marker head 112 of the marker ring 11 is embedded in the straight groove 331 of the boss 33 to achieve connection. Then the marker head 112 is in a straight line with the 0 / 180° scale line of the dial 2, the scale line of the limiting protrusion 32, and the straight groove 331 of the boss 33.

[0058] Then, rotate the dial 2 so that the scale line of the upper limit protrusion 32 of the base 3 (i.e., the second marking part 321) is aligned with the predetermined axis mark 91° of the dial 2. When rotating the dial 2, since the marking head 112 of the marking ring 11 is inserted into the straight groove 331 of the boss 33, the marking ring 11 cannot rotate. The ring structure 11 rotates with the grip part 13 under the drive of the dial 2, so that the marking ring 11 and the ring structure 11 rotate relative to each other. The marking head 112 rotates relative to each other to the predetermined axis (i.e., 91°). That is, the marking ring 11 does not move, and the first marking part 122 of the ring structure 12 rotates 91° relative to the marking head 112 of the marking ring 11. The two are no longer on the same straight line. Then rotate the knob at the upper end of the screw 132 so that the screw 132 is close to and abuts against the marking ring 11 to complete the locking. Then remove the marking device body 1 from the base 3.

[0059] The ring structure 12 of the marker body 1 is attached to the surface of the patient's eyeball. The 0 and 180° scale lines of the ring structure 12 correspond to the pre-marked points (such as 0 / 180°) on the surface of the eyeball. The position indicated by the marking head 112 on the marking ring 11 is the predetermined axis (i.e. 91°) of the patient's eyeball. Press down or flick the marking head 112 to complete the imprint on the surface of the eyeball.

[0060] In the above embodiments, when the dial 2 rotates, it drives the ring structure 12 to rotate. Therefore, as long as the ring structure 12 and the marking ring 11 rotate relative to each other, the angular axis of the eyeball requiring surgery can be determined. The dial 2 can drive either the ring structure 12 or the marking ring 11 to rotate. For example, after the marking ring 11 is inserted into the through hole 22 of the dial 2, it is connected by a connecting component to rotate synchronously with the dial 2. The ring structure 22 and the base 3 can be relatively fixed. For example, the ring structure 22 can be provided with protrusions or grooves that cooperate with the grooves or protrusions of the base body 31 to restrict rotation. In this way, the dial 2 drives the marking ring 11 to rotate while the ring structure 12 remains stationary.

[0061] Please continue to refer to this. Figure 4 In this embodiment, the marking head 112 of the marking ring 11 includes a root 112a and an end 112e. The root 112a is connected to the upper surface of the ring-shaped body 111 and extends approximately radially inward along the marking ring 11. The end 112e of the marking head 112 extends downward. The entire marking head 112 is approximately L-shaped, and this marking head 112 structure is easy to manufacture. This embodiment also provides several other marking head 112 structures.

[0062] like Figure 8 As shown, Figure 8 This is a schematic diagram of one structure of the marking ring 11 in an embodiment of this application; Figure 9 for Figure 8 A schematic diagram of the marker header 112; Figure 10 for Figure 9 A schematic diagram of the center marker 112 being moved above the root 112a.

[0063] The marking head 112 includes a root portion 112a and a rotating portion 112b rotatably connected to the root portion 112a. The rotating portion 112b is the end of the marking head 112, such as... Figure 9 As shown, during the surgery, before the marker body is fully aligned with the eyeball, the rotating part 112b is moved above the root 112a. In this way, the rotating part 112b used for marking will not come into contact with the eyeball. After alignment with the eyeball, the rotating part 112b is moved to the position on the eyeball that needs to be marked. This can avoid the end from coming into contact with the eyeball during the alignment process and making incorrect marks.

[0064] like Figure 11 , 12 As shown, Figure 11 This is a schematic diagram of another structure of the marking ring 11 in the embodiments of this application; Figure 12 for Figure 11 A schematic diagram of the central marker header 112.

[0065] The end of the marker head 112 can be a sheet perpendicular to the entire marker ring 11. After being coated with marking dye and attached to the eyeball, it can leave a short, straight mark on the surface of the eyeball.

[0066] like Figure 12 As shown, the end of the marking head 112 is an arc-shaped piece 112c with a certain arc length (e.g., 30 / 45 / 60 degrees), which can make arc-shaped marks on the eyeball, such as the arc-shaped marks in LRI (Limbal relaxing incision) surgery. It is understood that the end is not limited to the arc-shaped piece 112c; it can also be a flat piece structure perpendicular to the surface of the marking ring 11, which can mark straight lines. The end can be designed according to the shape of the mark, and this application does not impose specific limitations.

[0067] Figure 12 In this design, the marking head 112 includes a root 112a, a rotating part 112b, and an end 112c. The rotating part 112b is rotatably connected to the root 112a. The rotating part 112b and the end 112c are fixedly connected or integrally formed. As mentioned earlier, the rotatable connection can prevent mismarking. It is understood that the end of the marking head 112, which can be shaped like an arc-shaped piece 112c or a flat piece, is also suitable for marking. Figure 4 The fixed marker head 112 shown.

[0068] Please continue to refer to this. Figure 13 , Figure 13 This is a schematic diagram of another structure of the marking ring 11 in the embodiments of this application.

[0069] The end of the marking head 112 of the marking ring 11 is a hollow structure 112d. The hollow shape can be a straight line, an arc, or other shapes. The marking head 112 of this structure is not pre-coated with ink. Instead, after the marking body 1 is attached to the eyeball, a marking pen is used to directly mark the surface of the eyeball through the hollow area. This marking method can also prevent mismarking.

[0070] Please check again. Figure 14 understand, Figure 14 This is a view of the marker body 1 of the eye axis marker in the second embodiment of this application. The base 3 and the dial 2 are understood with reference to the first embodiment and will not be described again.

[0071] The difference from the first embodiment lies in the structure of the ring structure 12 of the marker body 1. The ring structure 12 no longer has an annular groove 121; instead, it has multiple circumferentially arranged limiting parts on its outer periphery. Specifically, the limiting parts are limiting rods 123', which radially limit the placement of the marking ring 11. This structure of the ring structure 12 is simpler. In this case, a notch can be marked on the upper surface of the ring structure 12, serving as the first marking part 122'.

[0072] In this embodiment, the ocular axis marker allows the marker body 1 to determine the axis on the dial 2 and base 3 before implanting the astigmatic correction intraocular lens. The axis is then marked during surgery using the axis determined by the marker body 1. At this time, the axis is determined on the dial 2 outside the patient's eye. The dial 2 is not limited by the size of the patient's eyeball and can be set to a larger size, making it easier to achieve precise marking (accuracy can be controlled to 1 degree or 0.5 degrees, or even smaller), thus reducing surgical errors. Furthermore, the axis marker includes a positioning component that restricts the relative rotation of the marking ring 11 and the ring structure 12, ensuring that the determined axis does not shift during surgery, guaranteeing the accuracy of the axis marking. This ocular axis marker can also be used multiple times, reducing surgical costs.

[0073] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. An eye axis marker, characterized in that, The device includes a marker body, a dial, and a base. The marker body and the dial are placed on the base. The marker body includes concentrically arranged and relatively rotatable marker rings and ring structures. The marker rings are provided with radially symmetrically distributed marker heads. The marker body also includes a positioning component that can restrict the relative rotation of the marker rings and the ring structures. When the dial rotates, it drives the ring structures or the marker rings to rotate. The dial has a through hole, and the marker rings and the ring structures are located in the through hole. The base includes a base body portion, and a boss is provided in the middle of the base body portion. The boss is located in the through hole, and the marker rings and the ring structures are located between the hole wall of the through hole and the boss. The positioning component is a gripping part, which includes a rod-shaped body and a screw. The rod-shaped body is fixed or integrally formed with the ring structure. The screw is threadedly connected to the rod-shaped body and rotates to abut against or move away from the marking ring. The dial is provided with a through hole, the marking ring and the ring structure are located in the through hole, the hole wall of the through hole is provided with a relief recess, the rod-shaped body is provided on the outer periphery of the ring structure, the relief recess avoids the rod-shaped body, and when the dial rotates, it drives the grip and the ring structure to rotate.

2. The eye axis marker according to claim 1, characterized in that, The ring structure has an annular groove, and the marking ring is placed in the annular groove; or, the ring structure has a plurality of limiting parts arranged circumferentially, and the plurality of limiting parts surround the outer periphery of the marking ring to radially limit the marking ring.

3. The eye axis marker according to claim 2, characterized in that, The ring structure has a first marking part arranged symmetrically in the radial direction.

4. The eye axis marker according to claim 3, characterized in that, The first marking part is a marking line, notch, recess, or protrusion provided on the upper surface of the marking ring.

5. The eye axis marker according to any one of claims 1-4, characterized in that, The boss has a groove structure, and the marking head is inserted into the groove structure.

6. The eye axis marker according to claim 5, characterized in that, The base is provided with a second marking portion that is radially symmetrically distributed, and the second marking portion and the groove structure are distributed radially.

7. The eye axis marker according to claim 6, characterized in that, The base body has radially symmetrically arranged, arc-shaped limiting protrusions, and the second marking part is disposed on the upper surface of the limiting protrusions.

8. The eye axis marker according to any one of claims 1-4, characterized in that, The marking head is an integral structure that is set together with the marking ring; or, the marking head includes a root and an end that is rotatably connected to the root.

9. The eye axis marker according to claim 8, characterized in that, The end is an arc-shaped piece, a flat piece, or a hollow structure.

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