Ophthalmic observation device

Abstract

An ophthalmic observation device is provided. This ophthalmic observation device includes an attachment mechanism, an upper arm, a lower arm, a first movable mirror, a second mirror, and a lens assembly having a lens frame. When the ophthalmic observation device is in a first configuration, the movable mirror and the lens frame are outside the on-axis optical path between the visualization device and the eye to be visualized. When the ophthalmic observation device is in a second configuration, the first mirror, the second mirror, and the lens frame are configured to redirect the optical path between the patient's eye and the visualization device to an off-axis optical path that is oblique from the eye with respect to the on-axis optical path.

Description

Technical Field

[0001] During various ophthalmic surgeries, microscopes, often digital microscopes, are used to provide the surgeon with enlarged and high-quality images of the eye's optical components. For example, during vitreoretinal surgery, the surgeon observes the eye's anatomical structure through a digital microscope that captures light directly reflected from the eye. Once the surgical objective is achieved, an important step in many surgeries is to confirm that the tissues around the eye remain intact. However, the tissues around the eye are outside the field of view of conventional microscopes used to observe the posterior part of the eye.

Background Art

[0002] As an example, at the end of vitreoretinal surgery, it is necessary to observe the ora serrata of the retinal termination, which is approximately 5 millimeters in front of the equator of the eye, because surgeons often recognize postoperative holes or packers at the retinal ora serrata as a result of vitreoretinal surgery. If a hole or packer is not recognized and corrected during vitreoretinal surgery, another surgery for retinal repair will be required for that patient.

[0003] However, as mentioned above, the retinal ora serrata is often outside the field of view of the microscope. To bring the retinal ora serrata into the field of view and confirm holes or packers, the surgeon often manually or using tools presses or distorts the eye to manipulate it. This is not only cumbersome, difficult, or potentially harmful to the eye, but it can also cause the visual axis of the eye to be misaligned with the optical axis of the microscope. Therefore, in the art, there is a need for an improved observation device that enables microscopic observation of the field of view including the retinal ora serrata without or with reduced need for adjustment or manipulation of the eye and keeps the visual axis of the eye aligned with the microscope.

Summary of the Invention

Means for Solving the Problems

[0004] The present disclosure generally relates to an ophthalmic observation device and systems and methods for using such an observation device.

[0005] Certain embodiments disclosed herein provide an ophthalmic observation device (the “observation device”) suitable for removably attaching to an ophthalmic visualization device such as a microscope. In certain embodiments, an ophthalmic observation device may be provided, which includes an attachment mechanism configured to attach the observation device to the visualization device, an upper arm connected to the attachment mechanism near the proximal end of the upper arm, and a lower arm connected to the upper arm near the distal end of the upper arm. The ophthalmic observation device may further include a first mirror movably connected to the attachment mechanism and having at least a first mirror position and a second mirror position, a second mirror connected to the upper arm, and a lens assembly having a lens frame configured to shift between a first lens frame position and a second lens frame position. The lens frame may have a central cavity configured to receive a lens.

[0006] The ophthalmic observation device may have a first configuration and a second configuration. In the first configuration of the ophthalmic observation device, the lens frame is in the first lens frame position. In the first lens frame position, the plane of the central cavity is perpendicular to the axis of the visualization device (the “visualization device axis”) along the on-axis optical path between the patient's eye and the visualization device, and the first mirror is in the first mirror position outside the on-axis optical path.

[0007] In the second configuration of the ophthalmic observation device, the lens frame is at the second lens frame position. At the second lens frame position, the plane of the central cavity is arranged at a frame angle with respect to the visualization device axis such that the plane of the central cavity is perpendicular to the first tilt axis of the off-axis optical path. Also, in the second configuration of the ophthalmic observation device, the first mirror is at the second mirror position. When at the second mirror position, the first mirror at least partially blocks the on-axis optical axis and is positioned at a first angle with respect to the visualization device axis to redirect the off-axis optical path received along the second tilt axis from the second mirror towards the visualization device. In the second configuration of the ophthalmic observation device, the second mirror is positioned at a second angle with respect to the visualization device axis within the off-axis optical path, and the second mirror is configured to redirect the off-axis optical path received along the first tilt axis from the lens within the lens frame at the second lens frame position towards the first mirror.

[0008] The following description and the associated drawings show in detail specific exemplary features of one or more embodiments.

[0009] The drawings described herein are for illustrative purposes only and are of a schematic nature and are not intended to limit the scope of the present disclosure but are intended to be exemplary.

Brief Description of the Drawings

[0010]

Figure 1

Figures 2A-2B

Figures 3A-3B

Figure 4

Figure 5

DETAILED DESCRIPTION OF THE INVENTION

[0011] The above summary is not intended to represent all possible embodiments and all aspects of the present disclosure. Rather, the foregoing summary is intended to illustrate some of the novel aspects and features disclosed herein. The above features and advantages and other features and advantages of the present disclosure will become readily apparent by reading the following detailed description of representative embodiments and the best mode for carrying out the present disclosure in conjunction with the accompanying drawings and the appended claims.

[0012] In the following description, details are set forth by way of example in order to facilitate understanding of the disclosed subject matter. However, it should be apparent to those skilled in the art that the disclosed implementations are examples and do not cover all possible implementations. Accordingly, it should be understood that references to the examples described are not intended to limit the scope of the present disclosure. It is fully contemplated that any variations and further modifications to the devices, apparatus, methods described, and any further applications of the principles of the present disclosure will be readily envisioned by those skilled in the art in the relevant technical fields. In particular, it is fully contemplated that the features, components, and / or steps described with respect to one implementation may be combined with the features, components, and / or steps described with respect to other implementations of the present disclosure.

[0013] As described herein, it should be noted that the distal end or distal portion of a component refers to the end or portion of that component that is closer to the patient's body during use. On the other hand, the proximal end or proximal portion of a component refers to the end or portion that is farther away from the patient's body. Thus, when the observation device (e.g., the observation device 102 in FIG. 1) is oriented so as to look down into the patient's eye above the patient, the distal end or portion can be the lower, bottom, or underside, and the proximal end or portion can be the upper, top, or upper side.

[0014] FIG. 1 shows a schematic diagram of an exemplary ophthalmic visualization system 100 that includes an ophthalmic observation device 102 ("observation device 102") and a visualization device 105. In the embodiments described herein, the visualization device 105 is a microscope such as a digital microscope. However, visualization devices 105 other than microscopes can also be used in accordance with the features of the present invention without departing from the scope of the present disclosure. The observation device 102 is removably attached to the visualization device 105 or another visualization device. In some embodiments, it may be preferable for the observation device 102 to be permanently attached to the visualization device 105. The visualization device 105 includes optical components that enable an operator to visualize the patient's eye 120 and the components of the eye 120 in more detail to achieve a surgical objective. One exemplary visualization device 105 suitable for this purpose is an ophthalmic microscope called ALCON LuxOR® Revalia™.

[0015] During vitreoretinal surgery, the operator can currently position the visualization device 105 above the patient such that the optical axis of the visualization device is perpendicular to the patient (e.g., perpendicular to the operating table on which the patient is lying) and aligned with the patient's eye. Such an arrangement is effective for the operator to observe the posterior part of the eye during the procedure, but thereby lacks flexibility in observing the equator and the upper wall of the eye.

[0016] Therefore, to conveniently observe the equator and the upper wall of the eye 120, the observation device 102 can have at least two configurations, which include a first on-axis configuration for observing the posterior part of the eye during treatment, and a second off-axis configuration for observing the equator and the upper wall part of the eye 120 with little or no manual manipulation of the eye 120, as shown, for example, by FIGS. 1 and 2B. In this way, the combined field of view of the observation device 102 is wider compared to the field of view of conventional observation devices.

[0017] As shown in FIG. 1, the observation device 102 is attached, for example, to a visualization device 105 positioned above the patient's eye during surgery. The observation device 102 includes a mounting mechanism 104. The mounting mechanism 104 includes a stationary mounting ring 107 used to attach the observation device 102 to the visualization device 105. The stationary mounting ring 107 is movably coupled to a rotatable ring 106, enabling the rotatable ring 106, and thus the observation device 102, to rotate 360 degrees relative to the stationary mounting ring 107. In some embodiments, a remote control or a foot-actuated pedal may be used to control the rotation.

[0018] FIG. 2A shows an ophthalmic observation device 202 in a first on-axis configuration according to a particular embodiment. As shown in the figure, when in the first configuration, the patient's eye can be observed along the visualization device axis 225 by the observation device 202.

[0019] In the illustrated embodiment, the upper arm 208 is attached to the rotatable ring 206 at a first attachment position 209. The upper end of the movable mirror 210 is pivotally attached to the rotatable ring 206 at a second attachment position 211. The lower arm 214 is movably or removably attached to the upper arm 208. The lower arm 214 has two parallel and similar-shaped extensions (shown in FIG. 3B).

[0020] As shown in FIG. 2A, the movable mirror 210 is in a first configuration corresponding to the viewing device 202 being in an on-axis position or configuration. When the viewing device 202 is in an on-axis configuration, the optical path extending along the visualization device axis 225 is not blocked between the visualization device and the lens 220 located on the lower arm 214. In particular, the movable mirror 210 and the fixed mirror 212 are positioned outside the optical path. In this configuration, the visualization device axis 225 is perpendicular to the plane of the lens 220 (or the plane of the lens frame or fixture 221 to which the lens 220 is attached).

[0021] In some embodiments, the upper arm 208 has an axis 244 that forms an angle of 90 to 180 degrees with respect to the axis 225. The upper arm 208 is hingedly attached to the lower arm 214 using a mounting pin 216 to create a hinged connection location. The upper portion of the lower arm 214 has an axis 246 that forms a second angle of 0 to 90 degrees with respect to the axis 225. The central portion of the lower arm 214 has an axis 240 that forms a third angle of 45 to 135 degrees with respect to the axis 225, and the lower portion of the lower arm 214 includes a second axis 242 that forms a fourth angle of 0 to 90 degrees with respect to the axis 225.

[0022] The axes 240 and 242 of the lower arm 214 correspond to the shape of the lower arm 214 that can assist in avoiding obstacles that may be present within the path of the lower arm 214 when the viewing device 102 rotates along a 360-degree path around the axis 225. According to various embodiments, one or more of the first angle, the second angle, and the third angle can be selected such that the viewing device 102 can rotate freely without being obstructed, for example, by the patient's nose or eyebrow, while positioning the lens 220 along the optical path of the visualization device suitable for examining or operating on the patient's eye.

[0023] According to some embodiments, the lower arm 214 is prevented from excessive movement in one direction by a stop mechanism 218 attached to the upper arm 208. When no upward pressure is applied to the lower arm 214, the proximal or upper end of the lower arm 214 rests on the stop mechanism 218. The stop mechanism 218 is sized such that when the proximal end of the lower arm 214 rests on the stop mechanism 218, the lens 220 can be positioned at a standard distance from the visualization device 105 and is positioned on the upper arm 208 accordingly. The lower arm 214 is restricted from excessive movement in the patient's direction, preventing a collision between the observation device 102 and the patient, but can move freely in the opposite direction. When an upward force is applied to the lower arm 214, the lower arm folds towards the rotatable ring 206 and moves away from the patient.

[0024] Thus, the arrangement of the upper arm 208, the stop mechanism 218, and the lower arm 214 provides a safety function such that when a force is applied to the lower arm 214 as a result of the lower arm 214 encountering an obstacle during rotation of the observation device 102, the lower arm 214 folds away from the patient. The obstacle can be, for example, the patient's nose, a surgical instrument used in a surgical procedure, etc.

[0025] In some embodiments, a pair of slots 230 are each provided at the distal end of each extension of the lower arm 214. The rotatable lens assembly 232 is configured to interact with a pair of slots 230 provided at the distal ends of the extensions of the lower arm 214. The lens assembly 232 includes a lens frame 221 for holding a lens 220 positioned in a central cavity of the lens frame 221. The lens assembly 232 further includes a pair of pins 234 on each side configured to slide between a first end and a second end of a pair of slots 230 disposed on each side of the lens assembly 232. The pair of slots 230 and pins 234 can be configured with an over-center spring mechanism that allows the lens 220 and frame 221 to transition between a first position and a second position on each side. When the lens 220 and frame 221 transition between the first position and the second position, the frame angle of the lens frame 221 changes such that the lens 220 is perpendicular to the visualization device axis 225 in the first position and the lens 220 is perpendicular to a first tilt axis 248 in the second position, and the first tilt axis 248 is oblique to the visualization device axis 225.

[0026] In some embodiments, the difference between the first position and the second position can include a rotation of 10 degrees to 30 degrees. In some embodiments, the difference between the first position and the second position can include a rotation of 15 degrees to 25 degrees. In some embodiments, the difference between the first position and the second position can include a rotation of 19 degrees to 21 degrees. In some embodiments, the difference between the first position and the second position can include a rotation of about 20 degrees. In some embodiments, the difference between the first position and the second position can include a rotation amount selected, for example, based on the length, relative angle, shape, or dimensions of an average patient, an average patient's eye, the upper arm, and the lower arm, to facilitate viewing the posterior part of the eye in the first position and the peripheral part of the eye in the second position, respectively.

[0027] The over-center spring mechanism, slot 230, and pin 234 may be configured or omitted in other ways, and it will be understood that the viewing device 202 may have various mechanisms for rotating and shifting the lens 220 from an on-axis position to an off-axis position. For example, the mechanism may be a manual movement, a master lever or switch for repositioning both the lens 220 and the movable mirror 210, or an actuator coupled to a button, remote control, or foot pedal for repositioning both the lens 220 and the movable mirror 210. In certain embodiments, a single or master switch on the viewing device 202 or on the remote control is configured to transition the viewing device 202 between a first configuration and a second configuration.

[0028] According to various embodiments, the lens 220 can be any lens suitable for observing a patient's eye. For example, the lens can be a wide-angle (aspherical) lens, thereby providing a relatively large field of view for capturing an image of the patient's eye that is not possible with other lens types. As another example, a relatively small-sized lens 220 can facilitate rotation or positioning of the viewing device 202 to obtain a wider field of view without colliding with the patient or other obstacles, and can be particularly suitable for pediatric or infant patients.

[0029] The viewing device 202 may have a disposable lower arm 214 and a distal lens 220. After surgery, the surgeon can remove the pin 216 and remove the lower arm 214 and distal lens 220 for disposal. The upper arm 208, movable mirror 210, and stationary mirror 212 can be sterilized under high temperature and high pressure, for example using an autoclave, for use in later surgeries. Thus, the upper arm 208, movable mirror 210, and stationary mirror 212 can be manufactured from materials suitable for withstanding high heat and temperature.

[0030] In the embodiment of FIG. 2A, the observation device 202 is shown at an on-axis position. With an on-axis configuration, the posterior part of the retina within the patient's eye is more visible. At this position, the movable mirror 210 does not obstruct the optical path between the patient's eye and the distal lens 220 extending along the visualization device axis 225. In the illustrated embodiment, the visualization device axis 225 is substantially vertical, but this is of an exemplary nature and not necessarily so. Rather, as will be appreciated by those skilled in the art, any orientation of the visualization device axis 225 can be selected to be suitable for various purposes.

[0031] FIG. 2B shows an exemplary observation device 202 at an off-axis position according to a particular embodiment. The observation device 202 includes a mounting mechanism 204 and is configured to be mounted to the visualization device 205 therethrough. The observation device 202 includes the components shown in FIG. 2A.

[0032] After the completion of the surgery, it is desirable for the surgeon to confirm that the ora serrata, which is the termination of the retina at the front of the eye, is intact. If there is damage to the ora serrata and the surgeon does not repair the tear or the packer, another surgery will be required. To visualize the ora serrata, it is necessary to capture the light reflected from the patient's eye at an angle, for example, the angle shown in FIG. 2B. In order for the visualization device to be able to visualize the ora serrata, the observation device 202 utilizes the mirrors 210, 212 at the off-axis position to redirect the optical path of the visualization device from a wider angle to the eye and visualize the light reflected from the retinal termination at the front of the patient's eye 120. In this way, the optical path is redirected to provide a wider field of view where the termination is more visible without the need for manipulation by a pushing or distorting hand.

[0033] As shown in FIG. 2B, the lens frame 221 and the lens 220 are positioned along a first tilt axis 248 when the observation device 102 is in an off-axis configuration. In this configuration, the direction-converted optical path from the patient's eye passing through the lens frame 221 and the lens 220 extends along a first tilt axis 248 that at least partially intersects the fixed mirror 212. The fixed mirror 212 redirects the optical path from the patient's eye to extend along a second tilt axis 249 toward the movable mirror 210, and the second tilt axis 249 is tilted with respect to the visualization device axis 225 and the first angular axis 248. The second tilt axis 249 is at least partially intersected by the movable mirror 210, such that the direction-converted optical path from the patient's eye extends along the visualization device axis 225 to the visualization device.

[0034] In the embodiment of FIG. 2B, the observation device 202 is shown in an off-axis position, where the position of the movable mirror 210 is at an angle 271 of 15 to 75 degrees with respect to the visualization device axis 225. However, as will be understood by those skilled in the art, this angle can be selected to be larger or smaller if suitable for a particular application.

[0035] The movable mirror 210 interacts with the light reflected by the patient's eye 120. The light from the patient's eye is visualized through a distal lens 220 positioned at an angle 272 of 15 to 45 degrees with respect to the visualization device axis 225. The angle 272 of the distal lens 220 enables visualization of the light reflected at the terminus of the retina in the anterior portion of the patient's eye. After the light passes through the distal lens 220, the light is directed to a stationary mirror 212 and ultimately to the movable mirror 210 positioned at an angle 271 of 15 to 45 degrees with respect to the visualization device axis 225. The light then reaches the visualization device 205, where the operator can visualize the terminus of the retina in the anterior portion of the patient's eye without manually manipulating the eye. According to various embodiments, the mirrors 210, 212 are angled using angular values selected based on the size, shape, and dimensions of the upper arm 208, lower arm 214, and the relative distances between the movable mirror 210, stationary mirror 212, visualization device 205, lens 220, the patient's eye, etc. The angles 271, 272, 273 described herein are measured with respect to the visualization device axis 225.

[0036] In some embodiments, while the viewing device 202 is in an off-axis position, the lens 220 can be positioned at 15 to 25 degrees with respect to the axis 225. The stationary mirror 212 is positioned at a fixed angle 273 of 15 to 45 degrees, and the angle 273 is selected to redirect the optical path between the distal lens 220 and the movable mirror 210. By redirecting the optical path in such a manner, the light reflected back from the patient's eye can be directed to the movable mirror 210 and back to the visualization device 205, enabling visualization of a wide field of view.

[0037] As discussed with respect to FIG. 2B, the viewing device 202 may include a master lever or switch coupled to the movable mirror 210 and the distal lens 220. By using the master lever or switch, the user can simultaneously adjust the angles of the mirror 210 and the lens frame 221 to shift the movable mirror 210 and the distal lens 220 to an off-axis position. Alternatively, the viewing device 202 may be coupled to an actuator or other means that enables autonomous movement from an on-axis position to an off-axis position. In some embodiments, the movable mirror 210 and the distal lens 220 may have three or more positions, such as an on-axis configuration and a plurality of off-axis configurations.

[0038] FIG. 3A shows a side view of an ophthalmic viewing device 302 having an electric assembly or rotation mechanism 360 according to a particular embodiment. As shown in the figure, the rotation mechanism 360 includes a motor 362 that supplies power for rotation of the spinner 364. In various embodiments, the spinner 364 is a rubber spinner 364 that is sufficient to rotate the viewing device 302, such as by engaging the rotatable ring 306, but provides enough friction to substantially prevent manual rotation that would cause difficulty when attempting to rotate by hand. In various embodiments, the motor 362 may be operated by a switch, remote control, or foot-actuated pedal.

[0039] FIG. 3B shows a perspective view of an ophthalmic viewing device 302 having an electric rotation mechanism 360 according to a particular embodiment. As shown in the figure, the movable mirror 310 and the upper arm 308 are attached to the rotatable ring 306 such that their respective arrangements remain unchanged when the ring 306 is rotated relative to the mounting component 307. FIG. 3B also shows a lower arm 314 having two parallel extensions 315A - B.

[0040] FIG. 4 shows the lower arm 414 of an ophthalmic viewing device according to a particular embodiment. The lower arm 414 is similar to the lower arm 214, but has at least the following differences. The lower arm 414 includes a second proximal lens frame 471 in which a second proximal lens can be received. The lower arm 414 includes a pin and hinge system 416 similar to that shown in FIGS. 2A - B. The lower arm 414 includes two pairs of slots 434 that interact with a lens assembly (not shown in FIG. 4) including a distal lens frame and a distal lens, similar to the lens assembly 232 of FIGS. 2A - B. In the embodiment of FIG. 4, the proximal lens and the distal lens can cooperate to improve or increase the field of view of the visualization device. Additionally, the lens housed in the lens frame 471 can be disposed by being incorporated into a lower arm similar to the lower arm 214 at a location on the lower arm 414 along its first tilt axis (e.g., the first tilt axis 248 of FIG. 2B) or at a location such as a location 290 where the first tilt axis 248 intersects the first section 224 of the lower arm 214.

[0041] FIG. 5 shows an ophthalmic observation device 502 having another exemplary electric rotation mechanism 560 according to a particular embodiment. As shown in the figure, the ophthalmic observation device 502 is similar to the ophthalmic observation device 302 of FIGS. 3A - B, but has a vertically oriented electric rotation mechanism 560. In the embodiment of FIG. 5, the electric rotation mechanism 560 includes a spinner 564, which is installed in the housing while being contained within a stationary mounting ring 507 and engages with a rotatable ring 506. The spinner 564 is operated by a motor that can be housed within a visualization device (e.g., visualization device 105) coupled to the stationary mounting ring 507. In embodiments where the visualization device is digital, the motor can be powered by the power system of the visualization device. For example, a digital visualization device can have at least three motors with corresponding motor drivers that can be used to electrify the rotation mechanism 560. In the embodiment of FIG. 5, the spinner 564 engages with the rotatable ring 506 at an outer portion of the rotatable ring 506. In some embodiments, instead of the motor being housed within the visualization device, the motor can be attached outside the visualization device and attached to the stationary ring 507 to engage with the rotatable ring 506. In some embodiments, such as for an analog visualization device, a separate power source and driver can be provided to drive the motor for operating the spinner 564.

[0042] Those skilled in the art will appreciate that the embodiments encompassed by the present disclosure are not limited to the specific exemplary embodiments described above. In this regard, while exemplary embodiments have been illustrated and described, various improvements, modifications, and substitutions in the above-described present disclosure are contemplated. It should be understood that such modifications to the above can be made without departing from the scope of the present disclosure. Accordingly, it is appropriate that the appended claims be construed in a broad manner consistent with the present disclosure.

Claims

1. An ophthalmic observation device (the "observation device"), a mounting mechanism configured to mount the observation device to a visualization device, an upper arm, the upper arm being connected to the mounting mechanism near the proximal end of the upper arm, a lower arm connected to the upper arm near the distal end of the upper arm, a first mirror movably connected to the mounting mechanism and having at least a first mirror position and a second mirror position, a second mirror connected to the upper arm, a lens assembly having a lens frame configured to shift between a first lens frame position and a second lens frame position, the lens frame having a central cavity configured to receive a lens, the lens assembly including, in a first configuration of the observation device, the lens frame is in the first lens frame position, whereby the plane of the central cavity is perpendicular to the axis of the visualization device (the "visualization device axis") along the on-axis optical path between the patient's eye and the visualization device, the first mirror is in the first mirror position outside the on-axis optical path, in a second configuration of the observation device, the lens frame is in the second lens frame position, and in the second lens frame position, the plane of the central cavity is arranged at a frame angle with respect to the visualization device axis such that the plane of the central cavity is perpendicular to a first tilt axis of the off-axis optical path, the first mirror is in the second mirror position, and in the second mirror position, the first mirror at least partially blocks the on-axis optical path and is positioned at a first angle with respect to the visualization device axis to redirect the off-axis optical path received along a second tilt axis from the second mirror toward the visualization device, and the second mirror is positioned at a second angle with respect to the visualization device axis within the off-axis optical path and is configured to redirect the off-axis optical path received along the first tilt axis from the lens within the lens frame at the second lens frame position toward the first mirror, an ophthalmic observation device (the "observation device").

2. The lower arm includes two extensions, the lower arm includes two pairs of slots at corresponding distal ends of the two extensions, The observation device according to claim 1, wherein the lens frame includes two pairs of pins, one pair of pins on one side of the lens frame and another pair of pins on another side of the lens frame.

3. The observation device according to claim 2, wherein the two pairs of pins are configured to engage with the corresponding two pairs of slots to enable the lens frame to be shifted from the first lens frame position to the second lens frame position and vice versa.

4. The observation device according to claim 1, wherein the lower arm includes a second lens frame having a second central cavity configured to receive a second lens.

5. The observation device according to claim 4, wherein a second plane of the second central cavity is arranged at a second frame angle with respect to the visualization device axis, and the second frame angle is parallel to the frame angle of the central cavity of the lens frame when the lens frame is in the second lens frame position.

6. The observation device according to claim 1, wherein the lower arm is removably connected to the upper arm.

7. The observation device according to claim 1, wherein the lens frame is configured to shift to three or more lens frame positions.

8. The mounting mechanism includes a stationary ring removably attached to the visualization device, and a rotatable ring attached to and rotatable with respect to the stationary ring, wherein the upper arm is connected to the rotatable ring. The observation device according to claim 1.

9. The observation device according to claim 8, further including an electric rotation mechanism coupled to the rotatable ring of the mounting mechanism, the electric rotation mechanism being configured to rotate the rotatable ring.

10. The observation device according to claim 9, wherein the electric rotation mechanism includes a spinner installed in the stationary ring and engaging with the rotatable ring.

11. The observation device according to claim 9, wherein the electric rotation mechanism is controlled by a foot-operated pedal or a remote control.

12. The observation device according to claim 1, wherein the lens is aspherical.

13. The upper arm and the lower arm are connected at a hinge connection position, and the upper arm includes a stop portion that is close to the hinge connection position and is configured to limit the movement of the lower arm. The observation device according to claim 1.

14. Further including a main switch, the main switch being configured to simultaneously move the first mirror between the first mirror position and the second mirror position and the lens frame between the first lens frame position and the second lens frame position. The observation device according to claim 1.

15. The first angle is between 15 degrees and 75 degrees. The observation device according to claim 1.

16. The frame angle is between 15 degrees and 25 degrees. The observation device according to claim 1.

17. The second angle is between 15 degrees and 75 degrees. The observation device according to claim 1.

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