Non-contact visualization system for surgical operating microscopes used in ophthalmic surgery

Abstract

The invention relates to a non-contact visualization system (1) of a surgical microscope (2) for ophthalmic surgery. The non-contact visualization system (1) has an ophthalmic magnifying glass (3) which can be positioned in front of a patient's eye (6) and provides a real but laterally and vertically inverted image of the fundus (7) of the patient's eye (6) in an intermediate image plane (8), which can be observed using the surgical microscope (2). The ophthalmic loupes (3) comprise a first lens element and a second lens element (271, 272), wherein, when positioned in front of the patient's eye (6), the first lens element (271) is closer to the patient's eye (6) than the second lens element (272), a wall (30) extends from the first lens element (271) to the second lens element (272), a free end (31) of the wall being designed as a mounting part (32), the second lens element (272) being mounted in the mounting part, and the mounting part (32) having at least one cutout (50, 51), the edge of the second lens element (272) being exposed in the at least one cutout so as to provide a surgical working area.

Description

[0001] The invention relates to a contactless visualization system for a surgical operating microscope for ophthalmic surgery, the contactless visualization system comprising the features of the preamble of claim 1 .

[0002] The use of so-called non-contact visualization systems is convenient for ophthalmic surgery of the posterior segment of the eye, and these non-contact visualization systems are gradually beginning to replace the visualization previously achieved by means of contact lenses placed on the patient's eye. These systems operate with so-called ophthalmic loupes, which are placed just above the patient's eye and provide a true (but laterally and vertically inverted) image of the fundus in an intermediate image plane, which can then be viewed using a surgical operating microscope.

[0003] Since the ophthalmic loupes are placed close to the patient's eyes, the surgeon's working space is limited. This is particularly difficult in the case of ophthalmic loupes with multiple lens elements (for example, two lens elements), because multiple lens elements require mounting parts, which further limits the surgeon's working space. This can lead to adverse impairment of the surgical procedure.

[0004] US 10 765 315 B2 describes a non-contact visualization system for a surgical operating microscope for ophthalmic surgery comprising the features of the preamble of claim 1. WO 99 / 20171 A1 describes an indirect visualization system comprising a contact lens element facing the eye and a further lens element spaced therefrom.

[0005] Against this background, the object of the present invention is to develop a contactless visualization system of the type stated in the introduction in order to overcome the above-mentioned difficulties as completely as possible.

[0006] The invention is defined in the independent claims 1 and 15. Advantageous configurations are specified in the dependent claims.

[0007] Since the wall simultaneously serves as a mount for the second lens element, it must have a certain mechanical minimum size and thickness for reasons of stability. According to the invention, the necessary stability is retained because only at least one cutout is provided, in which the edge of the second lens element is exposed, in order to provide the surgeon with more operating space.

[0008] The cutout can extend in the wall from the free end in the direction of the first lens element, wherein the cutout preferably does not extend to the upper side of the first lens element, but ends before it. Thus, even in the region of the cutout, a certain height of the wall is still provided; this is advantageous for stability reasons.

[0009] The cutout may taper in the direction of the first lens element.

[0010] This may involve exactly one cutout in which the edge of the second lens element emerges, or a plurality of cutouts in which the edge of the second lens element emerges. The wall may be embodied such that no further openings or cutouts are provided. However, alternatively, it is entirely possible that one or more further openings and / or cutouts are still formed in the wall.

[0011] Since the wall simultaneously serves as a mounting for the second lens element, the wall must have certain mechanical minimum dimensions and thicknesses for reasons of stability. Preferably, the wall is formed throughout the circumferential direction. That is, the cutouts, optionally further openings, are preferably arranged such that the wall is not interrupted or not completely interrupted in the circumferential direction. Therefore, the wall is preferably formed such that, at each position in the circumferential direction, the wall comprises at least one portion extending in the direction from the first lens element to the second lens element. In other words, the wall can be embodied such that the wall is completely closed in the circumferential direction or at least one imaginary closed curve extends on the wall in the circumferential direction.

[0012] In particular, two cutouts are provided, which are preferably spaced 80° to 140°, in particular 90° to 130°, particularly preferably 120° apart in the circumferential direction. This spacing is preferably related to the center of the respective cutout in the circumferential direction. The width of the cutout in the circumferential direction at the free end can be 20° to 70°, in particular 30° to 60° or 30° to 50°, particularly preferably 35° to 45°. Thus, the width can be, for example, 40°.

[0013] The ophthalmic loupes may include a holder connector by which the ophthalmic loupes can be mechanically connected to a surgical operating microscope, wherein the holder connector is connected to the mounting member at a connection portion, and at least one cutout is spaced 90° to 150° from the connection portion in a circumferential direction (preferably relative to the center of the cutout in the circumferential direction and the center of the connection portion in the circumferential direction).

[0014] Furthermore, at least one passage opening can be formed in the wall. The at least one passage opening serves to enable removal of liquid that may be present in the intermediate space between two lens elements. This can involve exactly one passage opening for removing liquid, or a plurality of passage openings for removing liquid.

[0015] Firstly, this guarantees the required mechanical stability and secondly, this ensures the removal of the liquid.

[0016] The width of the at least one passage opening in the circumferential direction can be 20° to 70°, in particular 30° to 60° or 30° to 50°, particularly preferably 35° to 45°. For example, the width can be 40°.

[0017] In particular, the wall can be formed as a one-piece part together with the first lens element. It is particularly preferably formed as an injection-molded part. This provides the option of implementing the ophthalmic loupes as disposable products or disposable articles while ensuring the required optical quality. By means of the mounting part, it can be ensured that the second lens element is positioned in an optically specified position relative to the first lens element. The one-piece embodiment of the wall and the first lens element is preferably realized in the form of an adhesive connection. However, it can also be realized by an interlocking connection.

[0018] In particular, the second lens element may be arranged concentrically to the first lens element.

[0019] The at least one passage opening is preferably formed closer to the first lens element than to the second lens element. In particular, the at least one passage opening may be formed such that its lower edge directly interfaces with the boundary surface of the first lens element facing the second lens element. Therefore, in this case, the lower edge that interfaces with the boundary surface of the first lens element preferably has a form in which no recess is provided. For example, the lower edge may extend perpendicularly to the optical axis of the first lens element.

[0020] In the case of a visualization system according to the invention, a plurality of access openings may be formed in the wall and spaced apart from each other in a circumferential direction. Thus, the at least one access opening may comprise a plurality of access openings. In this case, this may involve two, three, four, five, or more access openings.

[0021] For example, three passage openings may be provided, which are each spaced 120° apart from one another in the circumferential direction. Such spacing preferably relates to the center of the respective passage opening in the circumferential direction.

[0022] The first lens element and / or the wall may be made of plastic. In addition to the first lens element, the second lens element may also be made of plastic. The second lens element may include a holder connector, which may be integrally formed with the second lens element. In particular, the holder connector may be produced together with the second lens element by a two-component injection molding process. The integral form of the second lens element and the holder connector is preferably realized in the form of an interlocking connection. However, it may also be realized by an interlocking connection.

[0023] The mounting element may be in the form of a snap-on closure, a clamping connection, or an elastic clamping holder. To this end, the mounting element may comprise a plurality of elastic clamping fingers (e.g. three such clamping fingers, which are spaced apart from each other in the circumferential direction by, for example, 120° relative to the center of the respective clamping finger in the circumferential direction), which for example each comprise a clamping groove. The second lens element may have a corresponding mounting element area protruding into the clamping groove. Further, the mounting element may comprise corresponding mounting element areas, which comprise stop surfaces for the second lens element or for the mounting element area of ​​the second lens element.

[0024] However, other types of retention, such as a screw-in connection, a bayonet connection, etc., can also be achieved by means of the mounting element.

[0025] Preferably, at least one incision and at least one passage opening are arranged offset from each other in the circumferential direction. In particular, at least one incision and at least one passage opening may be arranged such that they are spaced apart from each other in the circumferential direction in each case. For example, the distance may be 60° (relative to the center of the respective incision in the circumferential direction and the center of the respective passage opening in the circumferential direction).

[0026] Furthermore, if n passage openings and / or n cutouts are provided, the first lens element and the wall may jointly comprise an n-fold rotational symmetry, wherein n is an integer ≥ 1 and ≤ 6. Particularly preferably, n=3.

[0027] The non-contact visualization system may further comprise an ophthalmic magnifier holder, to which the ophthalmic magnifier may be mechanically connected. By means of the ophthalmic magnifier holder, the ophthalmic magnifier may be positioned in and removed from the imaging beam path of the surgical microscope. To this end, the ophthalmic magnifier holder may further be mechanically connected to the surgical microscope. Further, the ophthalmic magnifier holder may be embodied so that the ophthalmic magnifier may be rotationally moved around the optical axis of the surgical microscope. Thus, for example, when using the ophthalmic magnifier, the user may place the ophthalmic magnifier in a rotational position that he or she desires and that he or she considers advantageous.

[0028] Furthermore, the mechanical connection between the ophthalmic loupes and the ophthalmic loupes support can be a detachable connection, as a result of which the ophthalmic loupes are replaceable. This is particularly advantageous in the case of ophthalmic loupes in the form of disposable articles.

[0029] In particular, the surgical microscope for eye surgery according to the invention may be in the form of a 3-D surgical microscope.

[0030] It goes without saying that the features mentioned above and the features still to be explained below can be used not only in the combination specified but also in other combinations or alone, without departing from the scope of the present invention.

[0031] The present invention will be explained in more detail below based on exemplary embodiments and with reference to the accompanying drawings, which also disclose features essential to the present invention. These exemplary embodiments are provided for illustrative purposes only and should not be interpreted as restrictive. For example, the description of an exemplary embodiment with multiple elements or components should not be interpreted as meaning that all these elements or components are necessary for implementation. Alternatively, other exemplary embodiments may also include alternative elements and components, fewer elements or components, or additional elements or components. Unless otherwise stated, the elements or components of different exemplary embodiments may be combined with each other. The modifications and variations described for one of the exemplary embodiments may also be applicable to other exemplary embodiments. In order to avoid repetition, the same or corresponding elements in different figures are represented by the same reference numerals, and the explanation is not repeated. In the accompanying drawings:

[0032] Figure 1 A schematic diagram showing an exemplary embodiment of a non-contact visualization system 1 in combination with a surgical operating microscope 2;

[0033] Figure 2 Shows Figure 1 A stereogram of an ophthalmic magnifier 3 in FIG.

[0034] Figure 3 Shows Figure 2 A three-dimensional cross-sectional view of an ophthalmic magnifying glass 3;

[0035] Figure 4 Shows Figure 1 A bottom view of the first lens element 271 of the ophthalmic magnifier 3;

[0036] Figure 5 Shows Figure 1 A stereoscopic view of the first lens element 271 of the ophthalmic magnifier 3 with the wall 30;

[0037] Figure 6 Shows Figure 1 A perspective view of another exemplary embodiment of an ophthalmic loupes 3 in FIG.

[0038] Figure 7 Shows Figure 1 A stereoscopic view of another exemplary embodiment of an ophthalmic loupes 3 in FIG.

[0039] exist Figure 1In the case of the exemplary embodiment of the non-contact visualization system 1 shown, the non-contact visualization system is shown together with a surgical microscope 2 for ophthalmic surgery. The non-contact visualization system 1 comprises an ophthalmic loupes 3 and an ophthalmic loupes holder 4, by means of which the ophthalmic loupes 3 can be pushed into (or positioned in) and pushed out of (or removed from) the imaging beam path of the surgical microscope 2, as shown in FIG. Figure 1 The double-headed arrow 5 is schematically depicted. Figure 1 The position of the ophthalmic loupes 3 outside the imaging beam path is depicted using dashed lines.

[0040] As from Figure 1 As can be further learned in the ophthalmic magnifier 3, the ophthalmic magnifier stand 4 can be placed directly above the patient's eye 6, as a result of which a true but laterally and vertically inverted image of the fundus 7 of the patient's eye 6 is imaged in the intermediate image plane 8. The true but laterally and vertically inverted image of the fundus 7 is then observed using the surgical operating microscope 2.

[0041] The surgical operating microscope 2 may comprise an illumination unit 9 for illuminating the patient's eye 6 (for example, in this case the fundus 7) and an imaging optical unit 10 for magnified imaging of the illuminated patient's eye 6, in this case also for magnified imaging of the image in the intermediate image plane 8. The patient's eye 6 with the pupil 28 and the lens 29 is depicted only schematically here.

[0042] Figure 1 The imaging optical unit 10 schematically depicted in the figure comprises a lens 11 and a first barrel optical unit 12 for imaging an illuminated area of ​​the patient's eye 6 on an image sensor 13. In addition, the imaging optical unit 10 comprises a first beam splitter 14, which is arranged between the lens 11 and the first barrel optical unit 12, a second barrel optical unit 15, and an eyepiece optical unit 16, the first beam splitter being arranged between the lens 11 and the first barrel optical unit 12, the second barrel optical unit being arranged downstream of the first beam splitter 14, and the eyepiece optical unit being arranged downstream of the second barrel optical unit 15 so that an optical eyepiece 17 is provided, as indicated by a schematically depicted user's eye 18.

[0043] The illumination unit 9 comprises a light source 19, a collector optical unit 20, a second beam splitter 21, and a lens 11, the collector optical unit being arranged downstream of the light source 19, the second beam splitter being arranged between the lens 11 and the first barrel optical unit 12. The light emitted by the light source 19 is focused by the collector optical unit 20 and input-coupled into the beam path between the second beam splitter 21 and the lens 11 by the second beam splitter 21 in such a way that the area to be illuminated of the patient's eye 6 is illuminated as uniformly as possible, such as Figure 1 8 by a schematic beam profile up to the intermediate image plane 8. The light source 19 can be in the form of a halogen lamp, a xenon discharge lamp, an LED, or a laser, for example.

[0044] The previously described elements of the surgical operating microscope 2 are arranged in the housing 22, such as Figure 1 The ophthalmic magnifier support 4 is mechanically connected to the housing 22, wherein, in addition to Figure 1 In addition to the sliding in and out of the ophthalmic magnifier 3, which is schematically indicated in the figure, a turntable mechanism can also be formed on the ophthalmic magnifier holder 4, as a result of which the ophthalmic magnifier 3 can also be rotated about the z-axis, in this case about the optical axis OA of the imaging beam path of the surgical operating microscope 2.

[0045] Further, the surgical operating microscope 2 comprises a controller 23, which comprises a processor P and a memory M and is connected to, for example, the light source 19, the image sensor 13 and a z-drive 24, by which the lens 11 can be moved in the z direction for focusing.

[0046] Further, an electronic visual display 25 and an input unit 26 may be connected to the controller 23, such as Figure 1 In this case, the input unit 26 is schematically depicted as a keyboard. Other types of input units, such as a foot switch, etc. are also possible.

[0047] In this case, the ophthalmic loupes 3 comprise exactly one first plastic lens element 271 having a first boundary surface 35 and a second boundary surface 36, and a second plastic lens element 272 having a first boundary surface 37 and a second boundary surface 38, wherein a wall 30 extending in the direction of the second lens element 272 is formed integrally with the first plastic lens element 271. The free end 31 of the wall 30 serves as a mounting 32, which can in particular be combined with Figures 2 to 5 The boundary surfaces 35-38 preferably have a curved form, wherein at least one of the boundary surfaces 35-38 is aspherically curved. The remaining one or more boundary surfaces are preferably spherically curved.

[0048] The mounting element 32 comprises a first mounting element part 40, a second mounting element part 41 and a third mounting element part 42, which are spaced apart from each other by 120° in the circumferential direction. Each mounting element part 40-42 comprises a first stop area 401, 411 and 421 and a second stop area 402, 412, 422, between which elastic clamping fingers 43, 44, 45 with clamping grooves 431, 441, 451 are arranged in each case.

[0049] The second lens element 272 includes three mounting regions 491-493 (particularly Figure 2 and Figure 3 4), the three mounting areas are clamped in the clamping grooves 431, 441 and 451 of the resilient clamping fingers 43-45 and contact the stop areas 401-403, so that the second lens element 272 is held concentrically with the first lens element 271. This type of clamping connection between the mounting 32 and the second lens element 272 can also be referred to as a snap-in connection.

[0050] The second lens element 272 additionally comprises a holder connector 55 , by means of which it can be detachably connected to the ophthalmic loupes holder 4 .

[0051] Since the wall 30 simultaneously serves as a mount 32 for the second lens element 272, it must have certain mechanical minimum dimensions and thicknesses for reasons of stability. This results in a substantially closed embodiment of the wall 30, as a result of which liquid can accumulate between the two lens elements 271 and 272 and cannot be drained away again. This would lead to a serious impairment of the optical imaging quality, whereby in some cases only partially focused imaging or no further focused imaging at all is possible.

[0052] Thus, in the lower region of the wall 30 (thus, in the vicinity of the first lens element 271), the wall here comprises three passage openings 46, 47 and 48, which are spaced apart from one another in the circumferential direction and are here arranged to be offset from one another by 120° in the circumferential direction. The width of each passage opening 46-48 in the circumferential direction can be, for example, 40°. Due to these passage openings 46-48, it is possible that unwanted liquid drains away by itself and / or that a user (e.g. a surgeon) removes the liquid when necessary. For this purpose, for example, a suitable suction tool (e.g. a medical sponge) can be held against the passage openings 46-48 or in the passage openings.

[0053] Therefore, unnecessary liquid in the intermediate space between the two lens elements 271 and 272 can be easily removed, and a desired optical imaging quality can be ensured for a long time.

[0054] As especially Figure 3As is evident from the figure, the passage openings 46-48 preferably have such a form that the lower edge 461, 471, 481 of the passage openings adjoins the upper boundary surface 36 of the first lens element 271. The upper boundary surface 36 is the boundary surface of the first lens element 271 facing the second lens element 272. Preferably, the lower edge 461, 471, 481 of the passage openings 46-48 has such a form that no recess is created between the lower edge 461, 471, 481 of the passage openings 46-48 and the upper boundary surface 36. For example, in the case presented here, the lower edge 461, 471, 481 has such a form that the lower edge extends substantially perpendicularly to the optical axis of the first lens element 271.

[0055] There is also a further problem that, due to the mounting 32, a larger space is taken up laterally next to the second lens element 272 than in previous almost edgeless ophthalmic loupes with only a single lens element. This limits the surgeon's working space. In order to be able to provide the desired retention of the second lens element 271 by means of the mounting 32, the wall 30 must have a certain mechanical minimum size and thickness for reasons of stability. However, it has been recognized that, for this purpose, the mounting 32 does not have to retain the entire edge of the second lens element 272. Therefore, the embodiment of the wall 30 here is such that two cutouts 50 and 51 are provided, in which the edge of the second lens element 272 is exposed. The two cutouts 50 and 51 are spaced apart from each other in the circumferential direction, for example, by 120°. Further, a third cutout 52 is also provided to provide sufficient space for a holder connector 55 in the region of the mounting 32.

[0056] However, the incisions 50 and 51 are provided for the user or surgeon. If the position of the retainer connector 55 is indicated as 12 o'clock, the first incision 50 and the second incision 51 are preferably provided at the 4 o'clock position and the 8 o'clock position, because that is where the surgeon's hand rests.

[0057] As especially Figures 2 to 4As is evident from the figure, the first cutout 50 and the second cutout 51 extend from the free end 31 in the direction of the first lens element 271. In the exemplary embodiment described here, the cutouts 50-51 do not extend to the upper side 36 of the first lens element 271, but end before it, so that for reasons of stability, a certain height of the wall 30 is still provided in the region of the cutouts 50 and 51. The lower edges 501, 502 of the cutouts 50 and 51 are therefore located above the lower edges 461, 471, 481 of the passage openings 46-48. The same applies to the lower edge 521 of the cutout 52. At the free end 31 of the wall 30, each of the two cutouts 50 and 51 extends, for example, by 40° in the circumferential direction. The distance between the cutout 50 and the cutout 51 in the circumferential direction (for example, 120° in this case) is related to the center of the cutouts 50, 51 at the free end 31 of the wall 30. The cutout 52 is spaced apart from the two cutouts 50 and 51 by 120° in the circumferential direction.

[0058] Especially from Figure 2 , Figure 3 and Figure 5 As can be seen in FIG. 1 , the extension range (or width) of the cutouts 50, 51 in the circumferential direction gradually narrows in the direction from the second lens element 272 to the first lens element 271. In other words, the width of the cutouts 50, 51 decreases in the direction of the lower edges 501, 502, or the cutouts 50, 51 are tapered.

[0059] As from Figures 2 to 5 As can be learned from , the passage openings 46-48 and the cutouts 50-52 are arranged in the circumferential direction in such a way that the cutouts 50-52 and the passage openings 46-48 are arranged alternately in each case. For example, these cutouts and these passage openings are offset from each other by 60° in the circumferential direction in each case. In this way, at each position of the wall 30, a desired minimum height and therefore a certain minimum stability can be provided.

[0060] In particular, the wall 30 is thus formed throughout the circumferential direction. Therefore, the wall 30 is not interrupted in the circumferential direction. Therefore, there is no position in the circumferential direction where a part of the wall does not extend at least over a certain section in the direction from the first lens element 271 to the second lens element 272. In other words, a closed curve extending in the circumferential direction on the wall can be imagined. Therefore, there is always a closed path in the circumferential direction.

[0061] In this case, the first lens element 271 (with wall 30) has a symmetry such that the first lens element 271 (with wall 30) is mirrored onto itself when rotated 120° around the optical axis of the first lens element 271 (with wall 30). Thus, there is a three-fold rotational symmetry present.

[0062] In particular, the ophthalmic loupes 3 can be embodied such that the ophthalmic loupes are detachably connected to the ophthalmic loupes holder 4. In this case, for example, it is preferred that the ophthalmic loupes 3 are embodied as disposable articles and therefore are intended to be used only once. After use of the ophthalmic loupes 3, they can be thrown away, as a result of which there are no problems with cleaning and disinfecting the ophthalmic loupes 3, which would otherwise be required. In this case, the ophthalmic loupes 3 are preferably made of plastic. In particular, the ophthalmic loupes can be plastic moldings.

[0063] Figure 6 Another exemplary embodiment of a contactless visualization system 1 is shown, which can be used in conjunction with Figure 1 In this exemplary embodiment, only the cutouts 50, 51 and 52 are provided. However, the wall 30 does not include any Figures 2 to 5 The passage opening presented in the exemplary embodiment of .

[0064] according to Figure 6 The advantage obtained by the exemplary embodiment of the invention is that, because of the provision of the cutouts 50 and 51, sufficient operating space is provided for the user or surgeon even in the region of the second lens element 272. Figure 6 Exemplary embodiments and according to Figures 2 to 5 The exemplary embodiment of is different only in that no passage opening is provided. Figures 2 to 5 All other features and configurations of the embodiments are present.

[0065] Figure 7 Another exemplary embodiment of a contactless visualization system 1 is shown, which can be used in conjunction with Figure 1 In this exemplary embodiment, the ophthalmic loupes 3 only include access openings 46-48. However, no cutouts 50-52 are provided. Figures 2 to 5 All features of the exemplary embodiments of the present invention are implemented in the same way. Figure 7 An advantage of the exemplary embodiment is that liquid that may accumulate in the space between the two lens elements 271 and 272 will drain away on its own and / or can be removed by the user when desired.

Claims

1. A non-contact visualization system (1) for a surgical microscope (2) for ophthalmic surgery, The non-contact visualization system (1) comprises an ophthalmic magnifier (3) which can be positioned in front of a patient's eye (6) and provides a true but laterally and vertically inverted image of the fundus (7) of the patient's eye (6) in an intermediate image plane (8), which intermediate image plane can be observed through the surgical operating microscope (2), wherein the ophthalmic magnifier (3) comprises a first lens element and a second lens element (271, 272), in, When positioned in front of the patient's eye (6), the first lens element (271) is closer to the patient's eye (6) than the second lens element (272), and wherein a wall (30) extends from the first lens element (271) to the second lens element (272), the free end (31) of the wall being in the form of a mounting (32) in which the second lens element (272) is retained, and It is characterized in that The mounting member (32) includes at least one cutout (50, 51), in which the edge of the second lens element (272) is exposed to provide operating space for a surgeon.

2. The contactless visualization system (1) according to claim 1, It is characterized in that The wall (30) is formed throughout the circumferential direction.

3. The contactless visualization system (1) according to claim 1 or 2, It is characterized in that The ophthalmic loupes (3) comprise a holder connector (55) by means of which the ophthalmic loupes (3) can be mechanically connected to the surgical microscope (2). The retainer connector (55) is connected to the mounting member (32) at a connection portion, and the center of the at least one cutout (50, 51) is spaced 90° to 150° from the center of the connection portion along the circumferential direction.

4. The contactless visualization system (1) according to claim 1 or 2, It is characterized in that The at least one cutout (50, 51) includes two cutouts (50, 51) formed in the mounting member (32), the centers of the two cutouts being spaced 60° to 180° apart from each other in the circumferential direction.

5. The contactless visualization system (1) according to claim 1 or 2, It is characterized in that At the free end (31), the at least one cutout (50, 51) extends 20° to 70° in the circumferential direction.

6. The contactless visualization system (1) according to claim 1 or 2, It is characterized in that The at least one cutout (50, 51) extends from the free end in the direction of the first lens element (271) in the wall (30) so that the at least one cutout (50, 51) conveniently terminates on the first lens element (271), so that the wall (30) of a predetermined height still exists below the at least one cutout (50, 51).

7. The contactless visualization system (1) according to claim 1 or 2, It is characterized in that The wall (30) is formed as a single piece with the first lens element (271).

8. The contactless visualization system (1) according to claim 1 or 2, It is characterized in that At least one passage opening (47, 48, 49) is formed in the wall (30) in order to be able to remove liquid that may be present in the intermediate space between the first lens element and the second lens element (271, 272).

9. The contactless visualization system (1) according to claim 8, It is characterized in that The at least one passage opening (47, 48, 49) is formed closer to the first lens element (271) than to the second lens element (272).

10. The contactless visualization system (1) according to claim 8, It is characterized in that A plurality of passage openings (47, 48, 49) are formed in the wall (30) and are spaced apart from one another in the circumferential direction.

11. The contactless visualization system (1) according to claim 8, It is characterized in that The first lens element (271) includes a boundary surface (36) facing the second lens element (272) and having a curved form, and the at least one passage opening (47, 48, 49) includes a lower edge (471, 481, 491) adjacent to the boundary surface (36) of the first lens element (271).

12. The contactless visualization system (1) according to claim 8, characterized in that The at least one passage opening (47, 48, 49) is arranged offset relative to the at least one cutout (50, 51) in the circumferential direction.

13. The contactless visualization system (1) according to claim 1 or 2, It is characterized in that The mounting member (32) is in the form of a resilient clamping retainer (43, 44, 45).

14. The contactless visualization system (1) according to claim 1 or 2, It is characterized in that An ophthalmic magnifier support (4) is provided, and the ophthalmic magnifier (3) is mechanically connected to the ophthalmic magnifier support, and the ophthalmic magnifier support is used to position the ophthalmic magnifier (3) in front of the patient's eye (6).

15. The contactless visualization system (1) according to claim 14, in, The ophthalmic magnifier (3) is detachably connected to the ophthalmic magnifier support (4).

16. A surgical microscope (2) for use in ophthalmic surgery, in, The surgical operating microscope (2) comprises a non-contact visualization system (1) as claimed in any one of the preceding claims.

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