Non-contact visualization system for surgical microscopes for ophthalmic surgery

Abstract

The present invention relates to a non-contact visualization system (1) for a surgical microscope (2) for ophthalmic surgery. The non-contact visualization system (1) comprises an ophthalmoscope magnifier (3) that can be positioned in front of a patient's eye (6) and provides a vertically and laterally inverted real image of the fundus (7) of the patient's eye (6) on an intermediate image plane (8) that can be viewed using the surgical microscope (2). The ophthalmoscope (3) has a first lens (271) and a second lens (272), and when positioned in front of the patient's eye (6), the first lens (271) is closer to the patient's eye (6) than the second lens (272), a wall (30) extends from the first lens (271) to the second lens (272), a free end (31) of said wall is designed as a mount (32) on which the second lens (272) is attached, and at least one through opening (47, 48, 49) is formed in the wall (30) for removing liquid that may be present in the intermediate area between the first lens (271) and the second lens (272).

Description

[Technical field]

[0001] The invention relates to a non-contact visualization system of a surgical microscope for eye surgery with the features of the preamble of claim 1 . [Background technology]

[0002] So-called non-contact visualization systems are readily used for ophthalmic surgery at the posterior section of the eye, and these are beginning to replace previous visualization by contact lenses placed on the patient's eye. These systems work with what are known as ophthalmic loupes, which are placed directly over the patient's eye and provide an actual image (albeit inverted laterally and vertically) of the fundus at an intermediate image plane, which can then be viewed using a surgical microscope.

[0003] As a result of the placement of the ophthalmic loupes near the patient's eye and the normal operation of the phacoemulsification and vitrectomy system, it is not uncommon for liquid to be deposited on the ophthalmic loupes.

[0004] Generally, known reusable ophthalmic loupes comprise a separate rim representing a mount that connects a single lens element of the ophthalmic loupe with its holder. Liquid can flow out between the holder and the single lens element. In the case of more recent injection-molded individual loupes made from plastic, it is possible to dispense with the peripheral holder. As a result, liquid can flow out even more easily in this case.

[0005] In the case of ophthalmic loupes with multiple lens elements (e.g. with two lens elements), the difficulty is that, depending on the mounting concept, a space occurs between the two lens elements, where liquid can collect but cannot drain again. The unfavourable consequence is that the optical image quality is seriously impaired and the object (fundus) can be imaged only partially in focus or not at all, dimly. This leads to unnecessary disturbances of the surgical procedure.

[0006] US 10765315 B2 describes a non-contact visualization system for a surgical microscope for ophthalmic surgery, which comprises the features of the preamble of claim 1. WO 2015 / 001200 A1 describes an indirect ophthalmic visualization system for observing the eye. Summary of the Invention [Problem to be solved by the invention]

[0007] Against this background, it is the object of the present invention to develop a non-contact visualization system of the initially indicated kind so as to be able to overcome the above mentioned problems as completely as possible. [Means for solving the problem]

[0008] The invention relates to independent claims 1 and 12 Advantageous configurations are set forth in the dependent claims.

[0009] According to the invention, at least one through-opening is formed in the wall to allow removal of liquid that may be present in the intermediate space between the two lens elements. This may concern exactly one through-opening for removing liquid or multiple through-openings for removing liquid. The wall may be embodied in such a way that no further openings or cutouts are provided. However, it is naturally possible that instead one or more further openings and / or cutouts are further formed in the wall.

[0010] The wall simultaneously serves as a mount for the second lens element and must therefore have a certain mechanical minimum size and thickness for stability. It is preferred that the wall is formed all around in the circumferential direction. That is to say, the through openings are preferably arranged so that the wall is uninterrupted in the circumferential direction. The wall is therefore preferably formed such that at each circumferential position the wall comprises at least one portion that extends 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 that at least one imaginary closed curve continues in the circumferential direction on the wall. This allows the provision of a stable visualization system.

[0011] This firstly ensures the necessary mechanical stability and secondly ensures the removal of liquid.

[0012] In the circumferential direction, the at least one through opening may have a width of 20° to 70°, in particular 30° to 60° or 30° to 50°, particularly preferably 35° to 45°. For example, the width may be 40°.

[0013] In particular, the wall can be formed as an integral part together with the first lens element. This is particularly preferably an injection-molded part. This offers the option of realizing the ophthalmic loupe as a disposable product or disposable item and at the same time guarantees the required optical quality. It is possible to ensure that the second lens element is located in an optically specified position with respect to the first lens element at the mount. The embodiment of the wall integral with the first lens element is preferably understood as a cohesive connection. However, realization by an articulating connection is also possible.

[0014] In particular, the second lens element may be arranged concentrically with the first lens element.

[0015] The at least one through opening is preferably formed closer to the first lens element than to the second lens element. . Small At least one through opening is formed such that its lower edge is directly adjacent to the boundary surface of the first lens element facing the second lens element. Will be In this case, the lower edge of the first lens element that contacts the boundary surface is preferably in a form that does not result in a recess. For example, the lower edge may extend perpendicular to the optical axis of the first lens element.

[0016] A plurality of through-openings may be formed in the wall of the visualization system according to the invention and may be spaced apart from one another in the circumferential direction. Thus, the at least one through-opening may comprise a plurality of through-openings. In this case, this may relate to two, three, four, five or more through-openings.

[0017] By way of example, three through openings may be provided, each spaced 120° apart from one another in the circumferential direction, the spacing preferably being relative to the centre of each through opening in the circumferential direction.

[0018] 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 be provided with a holder connector, which may be integrally formed with the second lens element. In particular, the holder connector may be manufactured together with the second lens element in a two-component injection molding process. The integral form of the second lens element with the holder connector is preferably understood as an interlocking connection. However, realization by cohesive bonding is also possible.

[0019] The mount may be in the form of a snap-in closure, a clamp connection, or a resilient clamp holder. To this end, the mount may comprise a plurality of resilient clamp fingers (e.g., three such clamp fingers circumferentially spaced apart from one another by 120° relative to the center of the respective clamp finger), which may each comprise, for example, a clamp groove. The second lens element may have a corresponding mounting area that projects into the clamp groove. Furthermore, the mount may comprise a corresponding mounting area, which comprises a stop surface for the second lens element or for the mounting area of ​​the second lens element.

[0020] However, any other type of retention by the mount is also possible, for example a screw connection, a bayonet connection, etc.

[0021] In a non-contact visualization system, the mount may further comprise at least one notch through which an edge of the second lens element is exposed to provide operating space to the surgeon.

[0022] The cutout may extend in the wall from the free end in the direction of the first lens element, the cutout preferably not extending up to the upper side of the first lens element, but terminating just before it. As a result, a certain height of the wall is still provided, even in the region of the cutout. This is advantageous for stability reasons.

[0023] The notch may taper towards the first lens element.

[0024] This may concern exactly one cutout through which the edge of the second lens element is exposed, or it may concern several cutouts through which the edge of the second lens element is exposed. In particular, two cutouts are provided, which are preferably spaced apart in the circumferential direction (relative to the centre of the respective cutout in the circumferential direction) by 80° to 140°, in particular 90° to 130°, particularly preferably 120°. In the circumferential direction, the width of the cutout at the free end may be 20° to 70°, in particular 30° to 60° or 30° to 50°, particularly preferably 35° to 45°. Thus, the width may be, for example, 40°.

[0025] The at least one cutout and the at least one through opening are preferably arranged offset from one another in the circumferential direction. In particular, the at least one cutout and the at least one through opening can in each case be arranged so as to be spaced apart from one another in the circumferential direction. For example, the distance can be 60° (relative to the center of the respective cutout in the circumferential direction and the center of the respective through opening in the circumferential direction).

[0026] The ophthalmic loupes may include a holder connector by which the ophthalmic loupes can be mechanically connected to a surgical microscope, the holder connector being connected to the mount at a connection site, and the at least one notch being circumferentially spaced 90° to 150° from the connection site (preferably relative to the center of the circumferential notch and the center of the circumferential connection site).

[0027] Furthermore, the first lens element and the wall may together have n-fold rotational symmetry if n through openings and / or n cutouts are provided, where n is an integer ≧1 and ≦6. Particularly preferably, n=3.

[0028] The non-contact visualization system may further comprise an ophthalmic loupe support, to which the ophthalmic loupe is mechanically connected. By means of the ophthalmic loupe support, the ophthalmic loupe can be positioned in and moved out of the imaging beam path of the surgical microscope. For this purpose, the ophthalmic loupe support may further be mechanically connected to the surgical microscope. Furthermore, the ophthalmic loupe support may be embodied in such a way that a rotational movement of the ophthalmic loupe around the optical axis of the surgical microscope is possible. Thus, a user can, for example, bring the ophthalmic loupe into a rotational position that he or she considers desirable and advantageous when using the ophthalmic loupe.

[0029] Furthermore, the mechanical connection between the ophthalmic loupe and the ophthalmic loupe support can be a separable connection, so that the ophthalmic loupe is replaceable. This is particularly advantageous when the ophthalmic loupe is in the form of a disposable item.

[0030] A surgical microscope according to the invention for eye surgery may in particular be in the form of a three-dimensional surgical microscope.

[0031] It goes without saying that the features mentioned above and those further described below can be used not only in the particular combination but also in other combinations or separately, without departing from the scope of the invention.

[0032] The present invention will be described in more detail below based on exemplary embodiments with reference to the attached drawings, which also disclose the essential features of the present invention. These exemplary embodiments are provided merely for illustration and should not be interpreted as limiting. For example, the description of an exemplary embodiment having a large number of elements or components should not be interpreted as meaning that all of these elements or components are necessary for the implementation. Rather, other exemplary embodiments may also include alternative elements and components, fewer elements or components, or additional elements or components. Unless otherwise specified, elements or components of different exemplary embodiments can be combined with each other. Modifications and changes described for one of the exemplary embodiments may also be applicable to other exemplary embodiments. To avoid repetition, the same or corresponding elements in different figures are indicated by the same reference signs and will not be described repeatedly. [Brief description of the drawings]

[0033] [Figure 1] FIG. 1 shows a schematic diagram of an exemplary embodiment of a non-contact visualization system 1 together with a surgical microscope 2. [Diagram 2] 2 shows a perspective view of the ophthalmic loupe 3 of FIG. [Diagram 3] 3 shows a perspective cross-sectional view of the ophthalmic loupe 3 of FIG. 2. [Figure 4] 2 shows a view from below of the first lens element 271 of the ophthalmic loupe 3 of FIG. [Diagram 5] 1. A perspective view of the first lens element 271 is shown along with the wall 30 of the ophthalmic loupe 3 of FIG. [Figure 6] 1 shows a perspective view of a further exemplary embodiment of the ophthalmic loupe 3 of FIG. [Figure 7] 1 shows a perspective view of a further exemplary embodiment of the ophthalmic loupe 3 of FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0034] In the case of an exemplary embodiment of a non-contact visualization system 1 shown in Figure 1, the non-contact visualization system 1 is shown together with a surgical microscope 2 for eye surgery. The non-contact visualization system 1 comprises an ophthalmic loupe 3 and an ophthalmic loupe support 4, by which the ophthalmic loupe 3 can be pushed (or positioned) into and pushed (or removed) out of the imaging beam path of the surgical microscope 2, as indicated diagrammatically by the double arrow 5 in Figure 1. The position of the ophthalmic loupe 3 outside the imaging beam path is indicated using dashed lines in Figure 1.

[0035] 1, the ophthalmic loupe 3 can be positioned directly above the patient's eye 6 by the ophthalmic loupe support 4, such that an actual vertically and horizontally inverted image of the fundus 7 of the patient's eye 6 is imaged at the intermediate image plane 8. This actual vertically and horizontally inverted image of the fundus 7 is then observed using the surgical microscope 2.

[0036] The surgical microscope 2 may comprise an illumination unit 9 for illuminating the patient's eye 6 (e.g. 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 an image of an intermediate image plane 8. The patient's eye 6 with its pupil 28 and crystalline lens 29 is shown here only diagrammatically.

[0037] The imaging optical unit 10, shown diagrammatically in Fig. 1, comprises a lens 11 and a first tube-type optical unit 12 for imaging an illuminated area of ​​a patient's eye 6 on an image sensor 13. Furthermore, the imaging optical unit 10 comprises a first beam splitter 14 arranged between the lens 11 and the first tube-type optical unit 12, a second tube-type optical unit 15 arranged downstream of the first beam splitter 14, and an eyepiece optical unit 16 arranged downstream of the second tube-type optical unit 15 such that an optical eyepiece 17 is provided, indicated by a diagrammatically indicated eye 18 of a user.

[0038] The illumination unit 9 comprises a light source 19, a collector optical unit 20 arranged downstream of the light source 19, a second beam splitter 21 arranged between the lens 11 and the first tube-type optical unit 12, and the lens 11. The light from the light source 19 is focused by the collector optical unit 20 as shown in Fig. 1 with a schematic beam profile up to an intermediate image plane 8, and the input is coupled by the second beam splitter 21 into a beam path between the second beam splitter 21 and the lens 11 such that the area of ​​the patient's eye 6 to be illuminated is illuminated as uniformly as possible. By way of example, the light source 19 can be in the form of a halogen lamp, a xenon discharge lamp, an LED or a laser.

[0039] The elements of the surgical microscope 2 described so far are arranged in a housing 22, as shown diagrammatically in Fig. 1. An ophthalmic loupe support 4 is mechanically connected to the housing 22, and in addition to the sliding in and out of the ophthalmic loupe 3 as shown diagrammatically in Fig. 1, a turret mechanism may also be formed on the ophthalmic loupe support 4, so that rotation of the ophthalmic loupe 3 about the z-axis, in this case about the optical axis OA of the imaging beam path of the surgical microscope 2, is also possible.

[0040] Furthermore, the surgical microscope 2 comprises a control device 23, which comprises a processor P and a memory M and is connected, for example, to the light source 19, the image sensor 13 and a z-drive device 24, by means of which the lens 11 can be moved in the z-direction for focusing.

[0041] Additionally, an electronic display device 25 and an input device 26 may be connected to the controller 23, as shown diagrammatically in Figure 1. In this case, the input device 26 is shown merely diagrammatically as a keyboard. Other types of input devices are possible, such as foot switches, for example.

[0042] In this case, the ophthalmic loupe 3 comprises exactly one first plastic lens element 271 with a first interface surface 35 and a second interface surface 36, and a second plastic lens element 272 with a first interface surface 37 and a second interface surface 38, the wall 30 extending towards the second lens element 272 being integrally formed with the first plastic lens element 271. The free end 31 of the wall 30 serves as a mount 32, as can be discerned in particular together with Figs. 2-5. The interface surfaces 35-38 preferably have a curved form, at least one of the interface surfaces 35-38 being aspherically curved. The remaining interface surface(s) are preferably spherically curved.

[0043] The mount 32 comprises a first mounting part 40, a second mounting part 41 and a third mounting part 42, which are in each case spaced apart from one another in the circumferential direction by 120°. Each mounting part 40-42 comprises a first fastening area 401 and a second fastening area 402, a first fastening area 411 and a second fastening area 412, as well as a first fastening area 421 and a second fastening area 422, in each case between which are arranged elastic clamping fingers 43, 44, 45 with clamping grooves 431, 441, 451, respectively.

[0044] The second lens element 272 comprises three mounting regions 491-493 (identifiable in particular in Figures 2 and 3) which are clamped in clamping grooves 431, 441 and 451 of the resilient clamp fingers 43-45 and are in contact with the stop regions 401-403 such that the second lens element 272 is held concentric with the first lens element 271. This type of clamp connection between the mount 32 and the second lens element 272 can also be referred to as a snap-in connection.

[0045] The second lens element 272 further comprises a holder connector 55 by means of which a separable connection to the ophthalmic loupes support 4 is possible.

[0046] Since the wall 30 simultaneously serves as a mount 32 for the second lens element 272, it must have a certain mechanical minimum size and thickness for stability. This results in the wall 30 having a substantially closed embodiment, so that liquid can collect between the two lens elements 271 and 272 but cannot flow out again. This can seriously impair the optical image quality, which can lead under certain circumstances to only partially focused or even unfocused imaging.

[0047] Thus, in its lower region (hence closer to the first lens element 271), the wall 30 here comprises three through-openings 46, 47 and 48, which are circumferentially spaced apart from one another and here offset from one another by 120° in the circumferential direction. The width of each through-opening 46-48 in the circumferential direction may be, for example, 40°. These through-openings 46-48 allow unwanted liquid to flow out itself and / or allow a user (for example a surgeon) to remove liquid as needed. For this purpose, for example a suitable liquid absorbing tool (for example a swab) can be held against or in the through-openings 46-48.

[0048] Therefore, the unnecessary liquid can be easily removed from the intermediate space between the two lens elements 271 and 272, and the desired optical image quality can be guaranteed indefinitely.

[0049] As can be seen in particular in Fig. 3, the through openings 46-48 are preferably in such a form that their lower edges 461, 471, 481 contact 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 edges 461, 471, 481 of the through openings 46-48 are in such a form that no recess is created between the lower edges 461, 471, 481 of the through openings 46-48 and the upper boundary surface 36. For example, in the present case, the lower edges 461, 471, 481 are in such a form that they extend substantially perpendicular to the optical axis of the first lens element 271.

[0050] Compared to previous substantially edgeless ophthalmic loupes with only a single lens element, there is the further problem that more space is taken up laterally adjacent to the second lens element 272 due to the mount 32. This limits the working space of the surgeon. In order to be able to provide the desired holding of the second lens element 271 by the mount 32, a certain mechanically minimal size and thickness of the wall 30 is essential for stability. However, it has been determined that for this purpose it is not necessary for the mount 32 to hold the entire edge of the second lens element 272. The wall 30 is therefore embodied here in such a way that two notches 50 and 51 are provided in which the edge of the second lens element 272 is exposed. The two notches 50 and 51 are circumferentially spaced apart from each other, for example by 120°. Furthermore, in order to provide sufficient space for the holder connector 55 in the area of ​​the mount 32, a third notch 52 is also provided.

[0051] However, the notches 50 and 51 are provided for the convenience of the user or surgeon. If the position of the holder connector 55 indicates 12 o'clock, the first notch 50 and the second notch 51 are preferably provided at the 4 o'clock and 8 o'clock positions, since that is where the surgeon's hand rests.

[0052] As is particularly evident in Figures 2-4, the first notch 50 and the second notch 51 extend from the free end 31 in the direction of the first lens element 271. In the exemplary embodiment described herein, in order to provide some additional height of the wall 30 in the region of the notches 50 and 51 for stability, the notches 50-51 do not extend to the upper side 36 of the first lens element 271, but end just before it. The lower edges 501, 502 of the notches 50 and 51 are thus arranged above the lower edges 461, 471, 481 of the through openings 46-48. Similarly for the lower edge 521 of the notch 52. At the free end 31 of the wall 30, for example, each of the two notches 50 and 51 comprises a circumferential extent of 40°. The distance between the circumferential notches 50 and 51, in this case for example 120°, is relative to the centres of the notches 50, 51 at the free end 31 of the wall 30. In the circumferential direction, the notch 52 is spaced 120° apart from the two notches 50 and 51.

[0053] 2, 3 and 5 in particular, the extent (or width) of the notches 50, 51 in the circumferential direction tapers in the direction from the second lens element 272 to the first lens element 271. One can also say that the width of the notches 50, 51 decreases in the direction of the lower edges 501, 502, or that the notches 50, 51 taper.

[0054] As can be gathered from figures 2 to 5, the through-openings 46-48 and the notches 50-52 are arranged such that in the circumferential direction the notches 50-52 and the through-openings 46-48 alternate in each case. For example, in the circumferential direction they are offset from one another by 60° in each case. In this way, the desired minimum height and therefore a certain minimum stability can be provided at each position of the wall 30.

[0055] Thus, in particular, the wall 30 is formed all around in the circumferential direction. The wall 30 is therefore uninterrupted in the circumferential direction. Thus, there is no position in the circumferential direction in the direction from the first lens element 271 to the second lens element 272 where a part of the wall does not extend over at least some portion. In other words, one can imagine a closed curve going around the wall in the circumferential direction. Thus, there is always a closed path in the circumferential direction.

[0056] In this case, first lens element 271 (with walls 30) has a highly symmetric form, so that a 120° rotation of first lens element 271 (with walls 30) about the optical axis of first lens element 271 (with walls 30) maps onto itself, so there is a three-fold rotational symmetry.

[0057] The ophthalmic loupe 3 can in particular be embodied so as to be removably connected to the ophthalmic loupe support 4. In this case, it is for example preferred that the ophthalmic loupe 3 is embodied as a disposable item and can therefore be used strictly once. After its use, the ophthalmic loupe 3 is disposed of, so that in particular there are no problems with the further necessary cleaning and disinfection of the ophthalmic loupe 3. In this case, the ophthalmic loupe 3 is preferably made from plastic. In particular, the ophthalmic loupe 3 can be a plastic moulding.

[0058] Figure 6 shows a further exemplary embodiment of a non-contact visualization system 1, which can be used together with the surgical microscope 2 according to Figure 1. In this exemplary embodiment, only the cutouts 50, 51 and 52 are provided. However, the wall 30 does not include any through openings as are present in the exemplary embodiment of Figures 2-5.

[0059] The advantage obtained by the exemplary embodiment according to Fig. 6 is that, because of the cutouts 50 and 51, sufficient operating space is provided for the user or surgeon even in the area of ​​the second lens element 272. Consequently, the exemplary embodiment according to Fig. 6 differs from the exemplary embodiment according to Figs. 2-5 only in that no through opening is provided. However, all other features and configurations of the embodiment of Figs. 2-5 are present.

[0060] Figure 7 shows a further exemplary embodiment of a non-contact visualization system 1, which can be used together with the surgical microscope 2 according to Figure 1. In this exemplary embodiment, the ophthalmic loupes 3 only comprise through openings 46-48. However, no cutouts 50-52 are provided. Otherwise, all features of the exemplary embodiment according to Figures 2-5 are implemented analogously. Consequently, an advantage of the exemplary embodiment according to Figure 7 is that liquid that may collect in the space between the two lens elements 271 and 272 can flow out itself and / or be removed by the user if necessary.

Claims

1. A non-contact visualization system (1) for a surgical microscope (2) for eye surgery, comprising: an ophthalmic loupe (3) positionable in front of a patient's eye (6) and providing an actual vertically and laterally inverted image of a fundus (7) of the patient's eye (6) at an intermediate image plane (8) viewable by the surgical microscope (2); The ophthalmic loupe (3) includes a first lens element (27 １ ) and a second lens element (27 ２ ) and The first lens element (27) is positioned in front of the patient's eye (6). １ ) is the second lens element (27 ２ ) closer to the patient's eye (6), A wall (30) is provided between the first lens element (27) １ ) to the second lens element (27 ２ ), the free end (31) of said wall being in contact with said second lens element (27). ２ ) in the form of a mount (32) on which the A non-contact visualization system (1), The first lens element (27 １ ) and the second lens element (27 ２ at least one through-opening (47, 48, 49) is formed in said wall (30) to allow removal of any liquid that may be present in an intermediate space between said wall (30) and said at least one through-opening (47, 48, 49) whose lower part is defined by a lower edge (47 1 , 48 1 , 49 1 ), and The first lens element (27 １ ) is the second lens element (27 ２ ) and has a boundary surface (36) having a curved configuration, and the lower edge (47 1 , 48 1 , 49 1 ) is arranged so that there is no recess between the first lens element (27 1 ) and the lower edge (47 1 , 48 1 , 49 1 ). １ ) to be in contact with the boundary surface (36) of Characterized by: Non-contact visualization system (1).

2. The wall (30) is formed around the entire circumference in the circumferential direction. A non-contact visualization system (1) according to claim 1.

3. The wall (30) is disposed adjacent to the first lens element (27 １ ) as an integral part. A non-contact visualization system (1) according to claim 1 or 2.

4. The at least one through opening (47, 48, 49) is disposed in the second lens element (27 ２ ) than the first lens element (27 １ ) near the Characterized in that A non-contact visualization system (1) according to claim 1 or 2.

5. characterised in that the at least one through opening (47, 48, 49) is formed in the wall (30) to form a plurality of through openings (47, 48, 49) spaced apart from one another in the circumferential direction. A non-contact visualization system (1) according to claim 1 or 2.

6. The first lens element (27 １ ) and said wall (30) are made of plastic, A non-contact visualization system (1) according to claim 1 or 2.

7. The second lens element (27 ２ ) is made of plastic, A non-contact visualization system (1) according to claim 1 or 2.

8. an ophthalmic loupe support (4) is provided, said ophthalmic loupe (3) is mechanically connected to said ophthalmic loupe support (4), said ophthalmic loupe support serving to position said ophthalmic loupe (3) in front of said patient's eye (6), A non-contact visualization system (1) according to claim 1 or 2.

9. The ophthalmic loupe (3) is detachably connected to the ophthalmic loupe support (4), A non-contact visualization system (1) according to claim 8.

10. The surgical microscope (2) is equipped with a non-contact visualization system (1) according to claim 1 or 2, A surgical microscope for eye surgery (2).

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