Ophthalmic observation device

Abstract

An ophthalmic viewing device is provided. An ophthalmic viewing device includes a mounting feature, an upper arm, a lower arm, a first movable mirror, a second mirror, and a lens assembly having a lens mount. When the ophthalmic viewing device is in the first configuration, the movable mirror and the lens frame are outside of the coaxial optical path between the visualization device and the eye being visualized. When the ophthalmic viewing device is in the second configuration, the first mirror, the second mirror, and the lens mount are configured to redirect an optical path between the eye of the patient and the visualization device to an off-axis optical path angled to the eye relative to the coaxial optical path.

Description

Background Art

[0001] During various ophthalmic surgeries, microscopes (usually digital microscopes) are used to provide surgeons with magnified, high-quality images of the optical components of the eye. For example, during vitreoretinal surgery, surgeons view the eye anatomy through a digital microscope that captures light reflected directly from the eye. Once the surgical goal has been achieved, an important step in many surgeries is to verify that the tissue surrounding the eye is intact. However, the tissue surrounding the eye is outside the field of view of traditional microscopes used to view the back of the eye.

[0002] For example, after completing vitreoretinal surgery, it is necessary to observe the ora serrata (the end of the retina located approximately 5 mm in front of the equator of the eye) because surgeons often find post-operative tears or folds in the ora serrata area of ​​the retina caused by vitreoretinal surgery. If the tear or fold is not identified and repaired as part of the vitreoretinal surgery, the patient will need another surgery to repair the retina.

[0003] However, as discussed, the ora serrata is typically outside the field of view of the microscope. In order to bring the ora serrata into view and inspect for tears or wrinkles, the surgeon typically manipulates the eye, either manually or with a tool, by pushing or twisting. Not only can this be cumbersome, difficult, or potentially harmful to the eye, but it can also cause the visual axis of the eye to no longer be aligned with the optical axis of the microscope. Therefore, there is a need in the art for an improved viewing device that allows microscopic viewing of a field of view that includes the ora serrata, while maintaining alignment of the visual axis of the eye and the microscope, without requiring or reducing the need for adjustment or manipulation of the eye. Summary of the invention

[0004] The present disclosure relates generally to ophthalmic viewing devices and systems and methods of using such viewing devices.

[0005] Certain embodiments disclosed herein provide an ophthalmic viewing device ("viewing device") adapted to be removably mounted to an ophthalmic visualization device, such as a microscope. In certain embodiments, the ophthalmic viewing device may include: a mounting feature configured for mounting the viewing device to the visualization device; an upper arm connected to the mounting feature near a proximal end of the upper arm; and a lower arm connected to the upper arm near a distal end of the upper arm. The ophthalmic viewing device may further include: a first reflector movably connected to the mounting feature and having at least a first reflector position and a second reflector position; a second reflector 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 viewing device can have a first configuration and a second configuration. In the first configuration of the ophthalmic viewing device, the lens frame is in a first lens frame position. In the first lens frame position, the plane of the central cavity is perpendicular to an axis of the visualization device along a coaxial optical path between the patient's eye and the visualization device ("visualization device axis"), and the first reflector is in a first reflector position outside the coaxial optical path.

[0007] In a second configuration of the ophthalmic viewing device, the lens frame is in a second lens frame position. In the second lens frame position, the plane of the central cavity is arranged at a frame angle relative to the visualization device axis, such that the plane of the central cavity is perpendicular to a first angled axis of the off-axis optical path. Also in the second configuration of the ophthalmic viewing device, the first reflector is in a second reflector position. When in the second reflector position, the first reflector at least partially intercepts the on-axis optical path and is positioned at a first angle relative to the visualization device axis for redirecting the off-axis optical path received from the second reflector along the second angled axis toward the visualization device. In the second configuration of the ophthalmic viewing device, the second reflector is positioned within the off-axis optical path at a second angle relative to the visualization device axis, and the second reflector is configured to redirect the off-axis optical path received from the lens in the lens frame in the second lens frame position along the first angled axis toward the first reflector.

[0008] The following description and the associated drawings set forth in detail certain illustrative features of the one or more embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0010] Figure 1 A schematic diagram of an exemplary ophthalmic visualization system including an ophthalmic viewing device is shown in accordance with certain embodiments.

[0011] Figure 2A An ophthalmic viewing device is shown in a first configuration, according to certain embodiments.

[0012] Figure 2B An ophthalmic viewing device is shown in a second configuration, according to certain embodiments.

[0013] Figure 3A An ophthalmic viewing device having a motorized rotation feature is shown in accordance with certain embodiments.

[0014] Figure 3B An ophthalmic viewing device having a motorized rotation feature and a second lens frame is shown in accordance with certain embodiments.

[0015] Figure 4A bottom arm of an ophthalmic viewing device is shown in accordance with certain embodiments.

[0016] Figure 5 An ophthalmic viewing device having a motorized rotation feature is shown in accordance with certain embodiments.

[0017] The above summary is not intended to present every possible embodiment or every aspect of the subject disclosure. Rather, the above 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 subject disclosure will become clear through the following detailed description of representative embodiments and implementation modes of the subject disclosure in conjunction with the accompanying drawings and the attached claims. DETAILED DESCRIPTION

[0018] In the following description, details are set forth by way of example to facilitate understanding of the disclosed subject matter. However, it is clear to those of ordinary skill in the art that the disclosed embodiments are exemplary and are not exhaustive of all possible embodiments. Therefore, it should be understood that the reference to the described examples is not intended to limit the scope of the present disclosure. Those skilled in the art in the technical field to which the present disclosure relates are generally fully able to envision any changes and further modifications to the described devices, instruments, methods, and any further applications of the principles of the present disclosure. In particular, it is fully envisioned that the features, components, and / or steps described for one embodiment may be combined with the features, components, and / or steps described for other embodiments of the present disclosure.

[0019] It should be noted that as described herein, the distal end or distal portion of a component refers to that end or portion that is closer to the patient during use. Alternatively, the proximal end or proximal portion of a component refers to that end or portion that is farther from the patient. Thus, when observing a device (e.g., Figure 1 When the viewing device 102 is oriented above the patient to look downward toward the patient's eyes, the distal end or distal portion can be a bottom portion, bottom end, or bottom side, and the proximal end or proximal portion can be a top portion, top end, or top side.

[0020] Figure 1A schematic diagram of an exemplary ophthalmic visualization system 100 is shown, which 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, in accordance with features of the present invention, visualization devices 105 other than microscopes may also be used 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 preferred that the observation device 102 is permanently mounted to the visualization device 105. The visualization device 105 includes optical components that allow the surgeon to visualize the patient's eye 120 and components of the eye 120 in more detail to achieve surgical goals. An example visualization device 105 suitable for this purpose is the ALCON Revalia TM Ophthalmic microscope.

[0021] During vitreoretinal surgery, the surgeon can currently position the visualization device 105 above the patient so that the optical axis of the visualization device is perpendicular to the patient (e.g., perpendicular to the surgical table on which the patient is positioned) and aligned with the patient's eye. This arrangement is effective for the surgeon to view the back of the eye during surgery, but does not allow for the flexibility of viewing the equator of the eye and the superior wall of the eye.

[0022] Thus, to conveniently view the equator and superior wall of the eye 120, the viewing device 102 can have at least two configurations, including a first on-axis configuration for viewing the posterior portion of the eye during surgery, and a second off-axis configuration for viewing the equator and superior wall portion of the eye 120 with little or no manual manipulation of the eye 120, such as, for example Figure 1 and Figure 2B In this manner, the combined field of view of the viewing device 102 is widened compared to the field of view of a conventional viewing device.

[0023] like Figure 1 As shown, the viewing device 102 is mounted on a visualization device 105, which is positioned over the patient's eye during surgery, for example. The viewing device 102 includes a mounting feature 104. The mounting feature 104 includes a fixed mounting ring 107 for mounting the viewing device 102 to the visualization device 105. The fixed mounting ring 107 is movably coupled to a rotatable ring 106, thereby allowing the rotatable ring 106 and thereby the viewing device 102 to rotate 360 ​​degrees relative to the fixed mounting ring 107. In some embodiments, the rotation can be controlled using a remote control or a foot pedal.

[0024] Figure 2AThe ophthalmic viewing device 202 is shown in a first coaxial configuration according to certain embodiments. As shown, when in the first configuration, the viewing device 202 allows viewing of the patient's eye along the visualization device axis 225.

[0025] In the illustrated embodiment, the upper arm 208 is attached to the rotatable ring 206 at a first attachment location 209. The top end of the movable reflector 210 is pivotally attached to the rotatable ring 206 at a second attachment location 211. The lower arm 214 is movably or removably attached to the upper arm 208. The lower arm 214 has two parallel and similarly shaped extensions (e.g., Figure 3B shown).

[0026] like Figure 2A As shown, the movable reflector 210 is in a first configuration, corresponding to the viewing device 202 in a coaxial position or configuration. When the viewing device 202 is in the coaxial configuration, the optical path extending along the visualization device axis 225 is unobstructed between the visualization device and the lens 220 located on the lower arm 214. Specifically, the movable reflector 210 and the fixed reflector 212 are located 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 220 mounted in the lens frame or mounting 221).

[0027] In some embodiments, the upper arm 208 has an axis 244 that forms an angle between 90 and 180 degrees relative to the axis 225. The upper arm 208 is hingedly attached to the lower arm 214 by the attachment pin 216 to form an articulated connection position. The upper portion of the lower arm 214 has an axis 246 that forms a second angle between 0 and 90 degrees relative to the axis 225. The middle portion of the lower arm 214 has an axis 240 that forms a third angle between 45 and 135 degrees relative to the axis 225, and the lower portion of the lower arm 214 includes a second axis 242 that forms a fourth angle between 0 and 90 degrees relative to the axis 225.

[0028] Axis 240 and axis 242 of lower arm 214 correspond to the shape of lower arm 214, which can help avoid potential obstructions in the path of lower arm 214 when viewing device 102 rotates in a 360 degree path about axis 225. According to various embodiments, one or more of the first angle, the second angle, and the third angle can be selected to enable viewing device 102 to rotate freely without being obstructed by, for example, the patient's nose or eyebrows, while positioning lens 220 along an optical path of a visualization device suitable for inspecting or operating the patient's eyes.

[0029] According to some embodiments, the lower arm 214 is prevented from excessive movement in one direction by a stop feature 218 attached to the upper arm 208. When there is no upward pressure on the lower arm 214, the proximal or upper end of the lower arm 214 rests on the stop feature 218. The size and position of the stop feature 218 on the upper arm 208 are determined so that when the proximal end of the lower arm 214 rests on the stop feature 218, the lens 220 can be positioned at a standard distance from the visualization device 105. The lower arm 214 is restricted from excessive movement in the direction of the patient, thereby preventing collision between the viewing device 102 and the patient, but can move freely in the opposite direction. An upward force applied to the lower arm 214 will cause it to fold toward the rotatable ring 206 and away from the patient.

[0030] Thus, the arrangement of the upper arm 208, the stop feature 218, and the lower arm 214 provides a safety function such that the lower arm 214 will fold upward away from the patient when a force is applied to the lower arm 214 due to the lower arm 214 encountering an obstruction during rotation of the viewing device 102. The obstruction may be, for example, the patient's nose, a surgical instrument used for a surgical procedure, etc.

[0031] In some embodiments, a pair of slots 230 are provided at the distal end of each extension of the lower arm 214. The rotatable lens assembly 232 is configured to interact with the pair of slots 230 provided at the distal end of the extension of the lower arm 214. The lens assembly 232 includes a lens frame 221 for holding a lens 220 located in a central cavity of the lens frame 221. Each side of the lens assembly 232 further includes a pair of pins 234, which are configured to slide between first and second ends of a pair of slots 230 respectively located 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 on each side, which allows the lens 220 and the frame 221 to be converted between a first position and a second position. When the lens 220 and the frame 221 are converted between the first position and the second position, the frame angle of the lens frame 221 changes, so that when in the first position, the lens 220 is perpendicular to the visualization device axis 225, and when in the second position, the lens 220 is perpendicular to the first angled axis 248, which is angled relative to the visualization device axis 225.

[0032] In some embodiments, the difference between the first position and the second position may include a rotation between 10 and 30 degrees. In some embodiments, the difference between the first position and the second position may include a rotation between 15 and 25 degrees. In some embodiments, the difference between the first position and the second position may include a rotation between 19 and 21 degrees. In some embodiments, the difference between the first position and the second position may include a rotation of about 20 degrees. In some embodiments, the difference between the first position and the second position may include an amount of rotation, which is selected to facilitate viewing the back of the eye in the first position and viewing the periphery of the eye in the second position based on, for example, the length, relative angle, shape, or size of an average patient, an average patient's eye, an upper arm, a lower arm, etc.

[0033] It should be understood that the over-center spring mechanism, slot 230, and pin 234 may be configured in other ways or omitted, and 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 main lever or switch that manually moves and repositions both the lens 220 and the movable mirror 210, or an actuator coupled to a button, remote control, or foot pedal that repositions both the lens 220 and the movable mirror 210. In some embodiments, a single switch or main switch located on the viewing device 202 or on a remote control is configured to switch the viewing device 202 between the first configuration and the second configuration.

[0034] According to various embodiments, the lens 220 can be any lens suitable for viewing the patient's eye. For example, the lens can be a wide-angle (aspherical) lens that provides a relatively large field of view to capture a view of the patient's eye that is not possible with other types of lenses. As another example, the relatively small size of the lens 220 can facilitate the rotation or positioning of the viewing device 202 to obtain a wider field of view without colliding with the patient or another obstruction, and can be particularly suitable for children or infant patients.

[0035] The viewing device 202 can have a disposable lower arm 214 and a distal lens 220. After surgery, the surgeon can remove the pin 216 to release the lower arm 214 and the distal lens 220 for disposal. The upper arm 208, the movable mirror 210, and the fixed mirror 212 can be sterilized for subsequent use in surgery, for example, using an autoclave under high heat and pressure. Therefore, the upper arm 208, the movable mirror 210, and the fixed mirror 212 can be made of materials suitable for withstanding high heat and high temperature.

[0036] exist Figure 2AIn the embodiment of FIG. 2 , the viewing device 202 is shown in a coaxial position. The coaxial configuration facilitates viewing the posterior portion of the retina in the patient's eye. In this position, the movable reflector 210 does not obstruct the optical path extending along the visualization device axis 225 between the patient's eye and the distal lens 220. Although the visualization device axis 225 is substantially vertical in the illustrated embodiment, this is exemplary in nature and need not be the case. Rather, as will be appreciated by one of ordinary skill in the art, any orientation of the visualization device axis 225 may be selected to suit a variety of purposes.

[0037] Figure 2B An exemplary viewing device 202 is shown in an off-axis position according to some embodiments. The viewing device 202 includes a mounting feature 204 by which the viewing device 202 is configured to be mounted to a visualization device 205. The viewing device 202 includes Figure 2A The components discussed in .

[0038] After the surgery is complete, it is best for the surgeon to confirm that the ora serrata (the front portion of the eye where the retina ends) is intact. If the ora serrata is not intact and the surgeon did not repair any tears or folds, another surgery will be needed. Visualizing the ora serrata requires capturing light reflected from the patient's eye at an angle, such as Figure 2B To allow the visualization device to provide visualization of the ora serrata, the viewing device 202 redirects the optical path of the visualization device to the eye from a wider angle using mirrors 210, 212 in an off-axis position, thereby allowing visualization of light reflected from the retinal extremities in the anterior portion of the patient's eye 120. Thus, the optical path is redirected to provide a field of view from a wider angle, which facilitates viewing of the extremities without the need for manual manipulation (such as pushing or twisting).

[0039] like Figure 2B As shown, when the viewing device 102 is in the off-axis configuration, the lens carrier 221 and the lens 220 are positioned along a first angled axis 248. In this configuration, the redirected light path from the patient's eye through the lens carrier 221 and the lens 220 travels along the first angled axis 248, which at least partially intersects the fixed reflector 212. The fixed reflector 212 redirects the light path from the patient's eye to travel along a second angled axis 249 toward the movable reflector 210, which is angled relative to the visualization device axis 225 and the first angled axis 248. The second angled axis 249 at least partially intersects the movable reflector 210, so that the redirected light path from the patient's eye travels along the visualization device axis 225 and enters the visualization device.

[0040] exist Figure 2BIn the embodiment of FIG. 2 , the viewing device 202 is shown in an off-axis position, wherein the position of the movable mirror 210 is at an angle 271 between 15 and 75 degrees relative to the visualization device axis 225. However, as will be appreciated by one of ordinary skill in the art, a larger or smaller angle may be selected if appropriate for a particular application.

[0041] The movable reflector 210 interacts with light reflected from the patient's eye 120. The light from the patient's eye is visualized through the distal lens 220, which is positioned at an angle 272 between 15 and 45 degrees relative to the visualization device axis 225. The angle 272 of the distal lens 220 allows visualization of light reflected from the retinal extremities in the anterior portion of the patient's eye. After the light passes through the distal lens 220, the light is directed to the fixed reflector 212 and ultimately to the movable reflector 210, which is positioned at an angle 271 between 15 and 45 degrees relative to the visualization device axis 225. The light then reaches the visualization device 205, where the surgeon can visualize the retinal extremities 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 angle values ​​selected based on the size, shape and size of the upper arm 208, the lower arm 214, the relative distances between the movable mirror 210, the fixed mirror 212, the visualization device 205, the lens 220, the patient's eye, etc., wherein the angles 271, 272, 273 described herein are measured relative to the visualization device axis 225.

[0042] In some embodiments, when the viewing device 202 is in an off-axis position, the lens 220 can be positioned at 15 to 25 degrees relative to the axis 225. The fixed mirror 212 is positioned at a fixed angle 273 between 15 and 45 degrees, which is selected to redirect the light path between the distal lens 220 and the movable mirror 210. Redirecting the light path in this manner allows light reflected back from the patient's eye to be directed to the movable mirror 210 and back to the visualization device 205, thereby enabling visualization of a widened field of view.

[0043] As reference Figure 2B As discussed, the viewing device 202 may include a main lever or switch coupled to the movable reflector 210 and the distal lens 220. By using the main lever or switch, the user can simultaneously adjust the angles of the reflector 210 and the lens frame 221 to shift the movable reflector 210 and the distal lens 220 to an off-axis position. Alternatively, the viewing device 202 may be coupled to an actuator or other device to allow autonomous movement from an on-axis position to an off-axis position. In some embodiments, the movable reflector 210 and the distal lens 220 may have more than two positions, such as an on-axis configuration and multiple off-axis configurations.

[0044] Figure 3A A side view of an ophthalmic viewing device 302 having a motorized assembly or rotation feature 360 ​​is shown in accordance with certain embodiments. As shown, the rotation feature 360 ​​includes a motor 362 that powers the rotation of a rotator 364. In various embodiments, the rotator 364 is a rubber rotator 364 that provides enough friction to rotate the viewing device 302 (such as by engaging the rotatable ring 306), but not enough to substantially inhibit manual rotation so as not to cause difficulty when attempting to rotate by hand. In various embodiments, the motor 362 can be operated by a switch, a remote control, or a foot pedal.

[0045] Figure 3B A perspective view of an ophthalmic viewing device 302 having a motorized rotation feature 360 ​​according to certain embodiments is shown. As shown, a movable reflector 310 and an upper arm 308 are attached to a rotatable ring 306 such that their respective arrangements remain unchanged when the ring 306 rotates relative to the mount 307. Figure 3B Also shown is a lower arm 314 having two parallel extensions 315A and 315B.

[0046] Figure 4 A bottom arm 414 of an ophthalmic viewing device is shown in accordance with certain embodiments. The bottom arm 414 is similar to the bottom arm 214, but has at least the following differences. The bottom arm 414 includes a second proximal lens frame 471 in which a second proximal lens can be received. The bottom arm 414 includes a second proximal lens frame similar to the bottom arm 214. FIG. 2A to FIG. 2B The pin and hinge system 416 is shown. The bottom arm 414 includes two pairs of slots 434 to mate with the lens assembly ( Figure 4 ), the lens assembly includes a distal lens frame and a distal lens, similar to FIG. 2A to FIG. 2B The lens assembly 232. Figure 4 In the embodiment of the present invention, the proximal lens and the distal lens can cooperate to improve or increase the field of view of the visualization device. In addition, the lens housed in the lens frame 471 can be located on the lower arm 414 along a first angled axis (e.g., Figure 2B , or, for example, by being integrated into a lower arm similar to the lower arm 214 , at a location 290 where the first angled axis 248 intersects the first section 224 of the lower arm 214 .

[0047] Figure 5 An ophthalmic viewing device 502 having another exemplary motorized rotation feature 560 is shown in accordance with certain embodiments. As shown, the ophthalmic viewing device 502 is similar to FIG. 3A to FIG. 3B The ophthalmic viewing device 302, however, the motorized rotation feature 560 has a vertical orientation. Figure 5In an embodiment, the motorized rotation feature 560 includes a rotator 564 disposed in a housing in the fixed mounting ring 507 and engaging the rotatable ring 506. The rotator 564 is operated by a motor that can be housed within a visualization device (e.g., visualization device 105) coupled to the fixed mounting ring 507. In embodiments where the visualization device is digital, the motor can be powered by a power system of the visualization device. For example, a digital visualization device can have at least three motors having corresponding motor drives that can be used to motorize the rotation feature 560. Figure 5 In some embodiments, the rotator 564 engages the rotating ring 506 at an outer portion of the rotating ring 506. In some embodiments, instead of housing the motor within the visualization device, the motor can be mounted outside the visualization device and attached to the fixed ring 507 to engage the rotating ring 506. In some embodiments, such as for use with an analog visualization device, a separate power source and driver can be provided to drive the motor to operate the rotator 564.

[0048] It will be appreciated by those skilled in the art that the embodiments encompassed by the present disclosure are not limited to the specific exemplary embodiments described above. In this regard, although illustrative embodiments have been shown and described, a wide variety of modifications, variations, and substitutions are contemplated in the foregoing disclosure. It should be understood that such changes may be made to the foregoing without departing from the scope of the present disclosure. Therefore, it should be understood that the appended claims should be interpreted broadly and in a manner consistent with the present disclosure.

Claims

1. An ophthalmic observation device ("observation device") comprising: a mounting feature configured for mounting the viewing device to a visualization device; an upper arm connected to the mounting feature proximate a proximal end of the upper arm; a lower arm connected to the upper arm proximate a distal end of the upper arm; a first reflector movably coupled to the mounting feature and having at least a first reflector position and a second reflector position; a second reflector connected to the upper arm; as well as 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, wherein: In a first configuration of the observation device: the lens frame being in the first lens frame position such that the plane of the central cavity is perpendicular to an axis of the visualization device along a coaxial optical path between an eye of the patient and the visualization device ("visualization device axis"); The first reflector is at the first reflector position outside the coaxial optical path; In a second embodiment of the observation device: the lens mount being in a second lens mount position, wherein in the second lens mount position, a plane of the central cavity is disposed at a mount angle relative to the visualization device axis such that the plane of the central cavity is perpendicular to a first angled axis of the off-axis optical path; The first reflector is in the second reflector position, wherein, in the second reflector position, the first reflector: at least partially intercepting the coaxial optical path, and positioned at a first angle relative to the visualization device axis for redirecting the off-axis light path received from the second reflector along a second angled axis toward the visualization device; and The second reflector: is positioned in the off-axis optical path at a second angle relative to the visualization device axis, and The lens mount is configured to redirect the off-axis optical path received along the first angled axis from the lens in the lens mount in the second lens mount position toward the first reflector.

2. The observation device according to claim 1, wherein: The lower arm includes two extensions, The lower arm includes two pairs of slots at corresponding distal ends of the two extensions, The lens frame includes two pairs of pins, including one pair of pins on one side of the lens frame and another pair of pins on the other 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 so as 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: The second plane of the second central cavity is arranged at a second frame angle relative to the visualization device axis, and when the lens frame is in the second lens frame position, the second frame angle is parallel to the frame angle of the central cavity of the lens frame.

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 carrier is configured to shift to more than two lens carrier positions.

8. The observation device according to claim 1, wherein: The installation features include: a retaining ring removably mounted to the visualization device; and A rotatable ring is attached to the fixed ring and rotatable relative to the fixed ring, wherein the upper arm is connected to the rotatable ring.

9. The viewing device of claim 8, further comprising a motorized rotation feature coupled to the rotatable ring of the mounting feature, the motorized rotation feature configured to rotate the rotatable ring.

10. The observation device according to claim 9, wherein: The motorized rotation feature includes a rotator disposed in the stationary ring and engaging the rotatable ring.

11. The observation device according to claim 9, wherein: The motorized rotation feature is controlled by a foot pedal or remote control.

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

13. The observation device according to claim 1, wherein: The upper arm and the lower arm are connected at a hinged connection, and the upper arm includes a stopper proximate the hinged connection and configured to limit movement of the lower arm.

14. The viewing device of claim 1 , further comprising a main switch configured to simultaneously move the first reflector between the first reflector position and the second reflector position and to simultaneously move the lens frame between the first lens frame position and the second lens frame position.

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

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

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

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