Method and system for controlling an ophthalmic surgical microscope with an oct device
Patent Information
- Application Number
- PCT/EP2026/053379
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2025-02-19
- Filing Date
- 2026-02-09
- Publication Date
- 2026-08-27
Smart Images
Figure EP2026053379_27082026_PF_FP_ABST
Abstract
Description
[0001] Method and system for controlling an ophthalmic operating microscope with an OCT device
[0002] The invention relates to a method for controlling an ophthalmic operating microscope with an OCT device and a system suitable for carrying out such a method.
[0003] In patients with nearsightedness (myopia) or farsightedness (hyperopia), it is possible to improve vision by implanting a phakic intraocular lens (IOL) into the eye. The natural lens of the eye remains in place. This is particularly beneficial for younger patients from a medical perspective, provided their natural lens is neither cloudy nor hardened, as occurs with cataracts. A phakic IOL thus supports the natural lens.
[0004] A prerequisite for improved vision is the selection of a suitable phakic intraocular lens for the patient. The use of an unsuitable intraocular lens can lead to significant medical complications. If, after implantation of a phakic intraocular lens, the distance between the back surface of the lens and the patient's natural lens is too small, there is an increased likelihood of developing a cataract. Conversely, if this distance is too large, the narrowing of the anterior chamber angle increases the likelihood of elevated intraocular pressure, potentially leading to glaucoma.Furthermore, additional side effects can occur due to incorrect positioning of a phakic intraocular lens in the eye, such as iris pigment dispersion or rotation of the intraocular lens, which can be detrimental in cases of astigmatism. If it is foreseeable that a patient with an implanted phakic intraocular lens will experience such side effects, it may be necessary to explant the implanted phakic intraocular lens. Statistics show that explantation is performed in approximately 1% of patients.
[0005] The decision to explant a phakic intraocular lens is made by a physician based on an examination. This involves postoperatively determining the position of the implanted phakic lens using an imaging technique, such as a slit lamp or a Scheimpflug camera.
[0006] 2024P00300WQ-19.01.2026 Intraocular lens determined. Another possibility is imaging using an OCT device (Optical Coherence Tomography), which is integrated into an operating microscope. A disadvantage of this method is that the surgeon needs some time to move the microscope to the desired position. During this time, eye movements can occur, preventing reliable measurements. The reproducibility of the measurement results is usually low. Based on such uncertain data, the surgeon must then decide whether or not to explant the lens. This decision is therefore time-consuming, prone to error, highly subjective, and requires extensive experience.
[0007] It is an object of the invention to propose a method for controlling an ophthalmic operating microscope with an OCT device, whereby a reliable, accurate, reproducible, and objective assessment of whether explantation of a phakic intraocular lens is necessary can be performed quickly during an operation. It is further an object to propose a system for controlling an ophthalmic operating microscope with an OCT device that is suitable for carrying out such a method.
[0008] The problem is solved for the method by the subject matter of claim 1.
[0009] Advantageous further developments are the subject of the dependent claims. The problem is solved for the system by the subject matter of claim 11.
[0010] The procedure for controlling an ophthalmic operating microscope with an OCT device comprises the following steps:
[0011] - Performing a first OCT scan, wherein the first OCT scan represents a first cross-section in a first plane in a lateral extent and a vertically perpendicular extent of a patient's eye to be examined, wherein the first OCT scan is performed in such a way that only a part of a phakic intraocular lens implanted in the patient's eye and only a part of an anterior capsular bag wall of the patient's eye are captured in the first OCT scan, - Determining a first magnitude of a first geometric quantity in the first OCT scan using an image processing device,
[0012] - Performing a second OCT scan, wherein the second OCT scan represents a second cross-section in the width and vertical dimension perpendicular to it of the patient's eye to be examined, wherein the second
[0013] 2024P00300WQ-19.01.2026OCT-Scan is performed in such a way that only a part of a cornea or sclera and only a part of the adjacent iris are captured in the second OCT scan,
[0014] - Determining a second value of a second geometric quantity in the second OCT scan using the image processing device,
[0015] - Forming a first result from a mathematical combination of the first amount with a predetermined first base value and forming a second result from a mathematical combination of the second amount with a predetermined second base value, wherein the first result and the second result are calculated using a calculating device,
[0016] - Outputting a result based on the first result and the second result using an output device.
[0017] The method involves performing a first and a second OCT scan. An OCT scan makes it possible to visualize a cross-section of the patient's eye. The OCT scan extends along a width and a height, with the height of the OCT scan preferably running along or parallel to an optical axis of the OCT device. Such an OCT scan is also referred to as a B-scan. The invention consists in the fact that, instead of performing a single OCT scan that visualizes a cross-section of the entire eye, starting from the entire cornea and extending to the patient's natural lens, the first and second OCT scans each examine only a portion of the eye and an implanted phakic intraocular lens. This results in fewer image points being generated, requiring less storage space and allowing for faster processing by an image processing device.Based on the results of image processing, an output device can provide information relatively quickly. This makes it possible to decide, even during surgery, whether a phakic intraocular lens should be repositioned or, if this is not possible, explanted.
[0018] The first OCT scan can have a width that is at most 150% of the pupil diameter, or preferably at most 100% of the pupil diameter, or more preferably at most 50% of the pupil diameter.
[0019] The decision as to whether a phakic intraocular lens should be explanted does not require a subjective interpretation of data in the method according to the invention, but is based on the fact that
[0020] 2024P00300WQ-19.01.2026: An initial value of a first geometric quantity is determined in the first OCT scan using the image processing device. This initial value is then mathematically linked to a predetermined initial baseline value using a computational device. The initial baseline value can be a first limit value. The first limit value specifies a minimum value that should not be undercut. It is advisable to use a limit value recommended in the literature for this initial limit value. This limit value is determined by the manufacturer of the operating microscope and fed into a computational device. The initial baseline value can also be a first predictive value, indicating the expected final position of the phakic intraocular lens postoperatively. The mathematical operation can be a basic arithmetic operation such as subtraction or addition.The mathematical operation yields a first result, and based on this first result, an output is fed to an output device.
[0021] By using the image processing device and determining the initial result, a fast, reliable, and objective evaluation of the OCT scan can be performed. Time-consuming and subjective marking of pixels or areas in the OCT scan by the physician is not required.
[0022] The first OCT scan captures only a portion of the patient's eye. This includes a part of the intraocular lens and a portion of the anterior capsular bag wall. According to the invention, a second OCT scan is performed analogously to the procedure described above, preferably in the first plane, to capture a second cross-section. The second scan can have a width in the range of 0.5 to 1.5 mm. This second scan depicts a portion of the cornea or sclera and a portion of the adjacent iris. A second result is determined by performing a mathematical operation, such as subtracting a second value of a second geometric quantity from a predetermined second baseline value. This second baseline value can be a second limit value, representing a minimum value.The second baseline value can also be a second predictive value, indicating the expected final position of the phakic intraocular lens postoperatively. This is also performed using the calculation device and the image processing device, after which an output is sent to the output device based on the second result.
[0023] 2024P00300WQ-19.01.2026The output device can be a screen or an additional display appearing on the screen.
[0024] The output can be:
[0025] the first result and / or the second result,
[0026] a graphic that allows an evaluation of the first result and the second result (for example, green for "OK", red for "not OK"),
[0027] the first scan and / or the second scan and the first result and the second result an acoustic signal which allows an evaluation of the first result and the second result (for example a first tone for "OK", a second tone for "not OK")
[0028] a recommendation for an implantable phakic intraocular lens.
[0029] The first OCT scan depicts the situation near the anterior capsular bag wall, and the second OCT scan depicts the situation in the area between the cornea and / or sclera and the adjacent iris. Using these two OCT scans and the associated output, a reliable, accurate, reproducible, and objective assessment can be made as to whether explantation of a phakic intraocular lens is necessary. The invention thus solves the stated problem.
[0030] Preferably, the procedure includes the following further steps:
[0031] - Taking a first image of the patient's eye using the operating microscope - Determining the position of the patient's eye in the first image using the image processing device,
[0032] - Moving the OCT device into a measuring position so that the light exiting the OCT device coincides with the center of a pupil of the patient's eye.
[0033] These steps can be performed before an OCT scan is created. These steps are advantageous because they ensure the operating microscope is positioned appropriately, allowing the first and second OCT scans to be acquired without repositioning the microscope. This eliminates the time required for moving the microscope, resulting in even faster acquisition of the first and second results.
[0034] 2024P00300WQ-19.01.2026 Result can be determined. For the second OCT scan, which captures an area at the edge of the eye, the image processing device can be equipped with a module that performs a correction due to oblique radiation incidence by the OCT device.
[0035] In a further development of the invention, the first geometric parameter in the first OCT scan, measured along the vertical dimension, is the minimum distance between the underside of the phakic intraocular lens and the upper side of the anterior capsular bag wall. Thus, a distance measurement is not only performed along the optical axis of the eye, where the highest point of the natural lens is often located, but across the entire width of the first OCT scan, the location of a minimum distance is checked. If such a minimum distance is detected outside the optical axis of the eye, it can be determined that the phakic intraocular lens is tilted, and repositioning may be beneficial even during surgery.
[0036] It is possible that the first geometric dimension is a first surface or surface shape between the underside of the phakic intraocular lens and the upper side of the anterior capsular bag wall. Information about this first surface or surface shape can be used to determine, for example, whether part of the iris is pressing too hard or not at all on a part of the intraocular lens, causing the lens to be partially misaligned.
[0037] The second geometric parameter can be the anterior chamber angle between a first tangent on an anterior iris surface and a second tangent on an inner corneoscleral wall. The anterior chamber angle can indicate the degree to which the iris is deformed by the intraocular lens towards the cornea and whether there is a risk of associated side effects.
[0038] According to further training, the procedure includes a further step:
[0039] Performing a third OCT scan, wherein the third OCT scan represents a third cross-section in a lateral extent and a vertically perpendicular extent of the patient's eye to be examined, wherein the third OCT scan is performed in such a way that its lateral extent extends from a first scleral spur of the patient's eye to an opposite second scleral spur of the patient's eye.
[0040] 2024P00300WQ-19.01.2026 This allows for the display of an overview. Preferably, the third OCT scan, which can be performed in the first plane, is acquired at a lower resolution than the first or second OCT scan, so that relatively few pixels need to be processed by the image processing unit and a fast display with the output device is achievable. This step can be useful to align the position of the operating microscope, and especially the optical axis of the OCT device, with the optical axis of the patient's eye or the center of the patient's pupil.
[0041] Preferably, the procedure includes the following further step:
[0042] Determine a first position for the first cross-section and a second position for the second cross-section in the third cross-section using the image processing device.
[0043] This ensures that the area of the first OCT scan and the second OCT scan is not determined by manual marking, which can be error-prone, but is determined by the image processing device.
[0044] The procedure may also include the following further steps:
[0045] - Performing a fourth OCT scan in a second plane, which is arranged at a depth distance parallel to the first plane, wherein the fourth OCT scan is performed in such a way that only a part of a phakic intraocular lens implanted in the patient's eye and only a part of an anterior capsular bag wall of the patient's eye are captured in the fourth OCT scan,
[0046] - Determining a fourth magnitude of the first geometric quantity in the fourth OCT scan using the image processing device, wherein the first geometric quantity is a second surface or surface shape between the underside of the phakic intraocular lens and the top of the anterior capsular bag wall,
[0047] - Calculating a volume using the first surface, the second surface, and the depth distance.
[0048] This makes it possible to create a three-dimensional representation of the part of the patient's eye being examined along with the first scan. Such a volumetric representation
[0049] 2024P00300WQ-19.01.2026 can provide an even better impression of how and in what position the phakic intraocular lens is arranged in the patient's eye.
[0050] Furthermore, the procedure may include the following steps:
[0051] Determining the respective curvature of the phakic intraocular lens, the anterior capsular bag wall, and the cornea in the respective OCT scan,
[0052] Correcting the first amount and the second amount and optionally the fourth amount, taking into account the respective curvature and a predetermined refractive index of the phakic intraocular lens, a predetermined refractive index of the anterior capsular bag wall and a predetermined refractive index of the cornea.
[0053] This is advantageous because it allows the respective amounts to be determined even more precisely.
[0054] The preferred method uses the first and second results to predict the postoperative final position of the phakic intraocular lens. This allows the surgeon to determine whether correcting the position of the intraocular lens is still advisable during the operation.
[0055] The system according to the invention for controlling an ophthalmic operating microscope comprises:
[0056] an ophthalmic operating microscope
[0057] an OCT device coupled to the ophthalmic operating microscope, an image processing device for processing an OCT scan created with the OCT device,
[0058] a computing device for calculating a result from OCT scan data; an output device for outputting a result,
[0059] a control device for controlling the ophthalmic operating microscope, the OCT device, the image processing device, the computing device and the output device,
[0060] the system is configured to execute a procedure as described above.
[0061] Further advantages and features of the invention are explained with reference to the following drawings, which show:
[0062] 2024P00300WQ-19.01.2026Fig. 1 a schematic representation of an embodiment of the system according to the invention and a cross-section through a patient's eye to be examined;
[0063] Fig. 2 is a schematic representation of a first OCT scan;
[0064] Fig. 3 shows a schematic representation of a second OCT scan; and
[0065] Fig. 4 shows a schematic representation of a first OCT scan and a fourth OCT scan.
[0066] Figure 1 shows a schematic representation of an embodiment of a system 1 according to the invention and a cross-section through a patient's eye 11. The system comprises an ophthalmic operating microscope 2 coupled to an OCT device 3. A scan acquired with the operating microscope 2 and the OCT device 3 can be processed by an image processing device 5. Using the data from the image processing device 5, a computing device 6 can perform the desired calculations. Based on these calculations, an output can be provided to an output device 7. The operating microscope 2, the OCT device 3, the image processing device 5, the computing device 6, and the output device 7 can be controlled by a control device 10.
[0067] The OCT device 3 has an optical axis 4. The OCT device 3 is positioned such that its optical axis 4 coincides with an optical axis 12 of the patient's eye 11. The patient's eye 11 has a cornea 13 and an iris 14. The iris 14 limits the amount of light entering the natural lens 16 located behind the iris 14. The opening created by the iris 14 is called the pupil 15. The natural lens 16 is located in a capsular bag 17, which is held in place by zonular fibers 18. A phakic intraocular lens 26 is implanted between the iris 14 and the capsular bag 17. Using the OCT device 3, it is possible to create a first OCT scan 30. The first OCT scan 30 captures only a part of the phakic intraocular lens 26 implanted in the patient's eye 11 and only a part of the capsular bag 17, specifically only a part of an anterior capsular bag wall 19.
[0068] The OCT device 3 can also be used to perform a second OCT scan 33. The second OCT scan 33 captures only a portion of the cornea 13 and / or sclera 21 and only a portion of the adjacent iris 14. This area is of interest because an implanted phakic intraocular lens 26 can alter the position of the iris 14, potentially leading to undesirable side effects. The OCT device 3 also allows for...
[0069] 2024P00300WQ-19.01.2026 to create a third OCT scan 35. This third OCT scan 35 extends in width at least from a first scleral spur 28 to an opposite second scleral spur 29 of the patient's eye 11. This makes it possible to obtain an overview from the left edge to the right edge of the patient's eye 11 and to record the complete position of the phakic intraocular lens 26.
[0070] Figure 2 shows a first OCT scan 30 with a first cross-section 31 through the patient's eye 11. The first OCT scan 30 shows, in a first plane 32, which is depicted in a width 40 and a height 41, a portion of the phakic intraocular lens 26 and a portion of the anterior capsular bag wall 19. A portion of the natural lens 16 is captured below the anterior capsular bag wall 19. This image can be processed by the image processing device 6. For example, it is possible to determine a first value of a first geometric quantity 50 as a distance in the first OCT scan 30. This distance can be a minimum distance between a lower surface TI of the phakic intraocular lens 26 and a top surface 20 of the anterior capsular bag wall 19.The underside TI of the phakic intraocular lens 26 must not touch the upper surface 20 of the anterior capsular bag wall 19 (in which case the first value of the first geometric quantity would have a distance of zero), as this would lead to undesirable friction between the intraocular lens 26 and the anterior capsular bag wall 19. However, the distance must also not be too large, as this can lead to a pathological increase in pressure in the patient's eye. Depending on the size of the intraocular lens 26, the distance can be between 200 pm and 700 pm. Therefore, it is sufficient for the first OCT scan 30 to have a height H of 1.5 mm. In terms of width, the first OCT scan 30 should capture at least 50% of the diameter of the pupil 15. Depending on the patient's age and ethnicity, and the brightness directed at the natural lens 16, the size of the pupil can vary. The width B of the first OCT scan 30 should therefore be at least 4 mm.To keep the number of data points low, the height H of the first OCT scan 30 should be a maximum of 3 mm and the width B of the first OCT scan a maximum of 8 mm.
[0071] The distance 50 allows for a statement regarding a one-dimensional quantity in the vertical dimension 41. However, it is also possible to determine in the first OCT scan 30 how this distance 50 behaves in the horizontal dimension. Firstly, an initial surface 51 between the lower surface TI of the phakic intraocular lens 26 and the upper surface 20 of the anterior capsular bag wall 19 can be captured. Secondly, the shape of the surface 51 can also be captured and evaluated.
[0072] 2024P00300WQ-19.01.2026 If, for example, the distance 50 from the left edge of the first OCT scan 30 to the right edge of the first OCT scan 30 decreases, this may indicate that the phakic intraocular lens 26 is implanted obliquely. It is possible that for the first geometric quantity, both the distance 50 and the area 51 and a surface shape are processed by the image processing device 6.
[0073] Given a distance of 50, an initial value B1 can be determined. Subtracting a predetermined limit G1 from this initial value B1 yields an initial result E1. Based on this initial result E1, an output can be generated using output device 7.
[0074] Figure 3 shows a second OCT scan 33, which depicts a second cross-section 34 through the patient's eye 11 in the first plane 32. The second OCT scan 33 shows part of the cornea 13 and the adjacent sclera 21, as well as part of the iris 14. The iris 14 has an anterior iris surface 24. The portion of the cornea 13 and sclera 21 has an inner corneo-scleral wall 22 facing the iris 14. In the second OCT scan 33, it is possible to draw a first tangent 25 on the anterior iris surface 24 and a second tangent 23 on the inner corneo-scleral wall 22, starting from the first scleral spur 28. The angle between the first tangent 25 and the second tangent 23 is the anterior chamber angle 53, which represents a second geometric quantity. The height of the second OCT scan 33 can be in a range of 0.5 to 2 mm, the width of the second OCT scan can be in a range of 0.5 to 2 mm.
[0075] The anterior chamber angle 53° can be determined as a second value B2. Subtracting a predetermined second limit value G2 from this second value B2 yields a second result E2. Based on the second result E2, an output can be generated using the output device 7.
[0076] Figure 4 shows a first OCT scan 30 with a first cross-section 31 in a first plane 32 and a fourth OCT scan 36 with a fourth cross-section 38 in a second plane 37 in an oblique view. Like the first OCT scan 30, the fourth OCT scan 36 shows a portion of the phakic intraocular lens 26 and a portion of the anterior capsular bag wall 19, but offset at a depth T relative to the first OCT scan 30. The first geometric dimension that can be seen in the first OCT scan 30 is a first surface 51 between the intraocular lens 26 and the anterior capsular bag wall 19.
[0077] In the fourth OCT scan 36, a first value B1 can be determined between the intraocular lens 26 and the anterior capsular bag wall 19. Similarly, a second surface 52 with a fourth value B4 can be determined between the intraocular lens 26 and the anterior capsular bag wall 19. Based on the first surface 51, the second surface 52, and the depth T along a depth extension 42, a volume between the lower surface I of the phakic intraocular lens 26 and the upper surface 20 of the anterior capsular bag wall 19 can be determined. This allows for even more precise information about the position of the phakic intraocular lens 26 in the patient's eye 11.
[0078] 2024P00300WO-19.01.2026 Reference List
[0079] 1 system
[0080] 2 operating microscopes
[0081] 3 OCT devices
[0082] 4 optical axis of the OCT device
[0083] 5 Image processing device
[0084] 6 Calculation device
[0085] 7 Output device
[0086] 10 Control device
[0087] 11 Patient's eye
[0088] 12 optical axis patient eye
[0089] 13 Cornea
[0090] 14 Iris
[0091] 15 pupils
[0092] 16 natural eye lens
[0093] 17 Capsule bag
[0094] 18 zonular fibers
[0095] 19 front capsule wall
[0096] 20 Top of the anterior capsule wall
[0097] 21 Sclera
[0098] 22 inner corneo-scleral wall
[0099] 23 second tangent at inner corneo-scleral wall 24 anterior iris surface
[0100] 25 first tangent to anterior iris surface
[0101] 26 phakic intraocular lens
[0102] TI underside of the phakic intraocular lens
[0103] 28 first scleral spur
[0104] 29 second scleral spur
[0105] 30 first OCT scan
[0106] 31 first cross section
[0107] 2024P00300WO-19.01.202632 first level
[0108] 33 second OCT scan
[0109] 34 second cross section
[0110] 35 third OCT scan
[0111] 36 fourth OCT scan
[0112] 37 second level
[0113] 38 fourth cross section
[0114] 40 Width extent
[0115] 41 Height extent
[0116] 42 Depth extension
[0117] 50 Distance as the first geometric quantity
[0118] 51 first area as first geometric quantity
[0119] 52 second area as first geometric quantity
[0120] 53 Anterior chamber angle as a second geometric quantity
[0121] B width
[0122] H height
[0123] T Depth distance
[0124] B1 first amount
[0125] BA1 first underlying asset
[0126] B2 second amount
[0127] BA2 second underlying asset
[0128] B4 fourth amount
[0129] G1 first limit value
[0130] G2 second limit value
[0131] E1 first result
[0132] E2 second result
[0133] 2024P00300WO-19.01.2026
Claims
1. Method for controlling an ophthalmic operating microscope (2) with an OCT device (3), wherein the method comprises the following steps: - Performing a first OCT scan (30), wherein the first OCT scan (30) represents a first cross-section (31) in a first plane (32) in a width extent (40) and a height extent (41) perpendicular to it of a patient eye (11) to be examined, wherein the first OCT scan (30) is performed in such a way that only a part of a phakic intraocular lens (26) implanted in the patient eye (11) and only a part of an anterior capsular bag wall (19) of the patient eye (11) are captured in the first OCT scan (30), - Determining a first amount (B1) of a first geometric quantity in the first OCT scan (30) using an image processing device (5), - Performing a second OCT scan (33), wherein the second OCT scan (33) represents a second cross-section (34) in the width (40) and the height (41) perpendicular to it of the patient's eye (11) to be examined, wherein the second OCT scan (33) is performed in such a way that only a part of a cornea (13) or sclera (21) and only a part of the adjacent iris (14) are captured in the second OCT scan (33), - Determining a second amount (B2) of a second geometric quantity in the second OCT scan (33) using the image processing device (5), - Forming a first result (E1) from a mathematical combination of the first amount (B1) with a predetermined first base value (BA1) and forming a second result (E2) from a mathematical combination of the second amount (B2) with a predetermined second base value (BA2), wherein the first result (E1) and the second result (E2) are calculated using a calculation device (6), - Outputting an output based on the first result (E1) and the second result (E2) using an output device (7).
2. The method of claim 1, wherein the method comprises the following steps: - Taking a first image of the patient's eye (11) using the operating microscope (2), - Determining the position of the patient's eye (11) in the first image using the image processing device (5), 2024P00300WQ-19.01.2026- Moving the OCT device (3) into a measuring position so that a light exit from the OCT device (3) coincides with the center of a pupil (15) of the patient's eye (11).
3. Method according to claim 1 or 2, wherein the first geometric dimension along the height extension (41) is a minimum distance between a bottom surface (27) of the phakic intraocular lens (26) and a top surface (20) of the anterior capsular bag wall (19).
4. Method according to claim 1 or 2, wherein the first geometric quantity is a first surface (51) or a first surface shape between the underside (27) of the phakic intraocular lens (26) and the top side (20) of the anterior capsular bag wall (19).
5. Method according to any of the preceding claims, wherein the second geometric quantity is an anterior chamber angle (53) between a first tangent (25) at an anterior iris surface (24) and a second tangent (23) at an inner corneo-scleral wall (22).
6. A method according to any of the preceding claims, wherein the method comprises the following step: - Performing a third OCT scan (35), wherein the third OCT scan (35) represents a third cross-section in a width extent (40) and a height extent (41) perpendicular to it of the patient eye (11) to be examined, wherein the third OCT scan (35) is performed such that in its width extent (40) it extends from a first scleral spur (28) of the patient eye (11) to an opposite second scleral spur (29) of the patient eye (11).
7. The method of claim 6, wherein the method comprises the following step: - determine a first position for the first cross-section (31) and a second position for the second cross-section (34) in the third cross-section using the image processing device (5).
8. A method according to any of the preceding claims, wherein the method comprises the following steps: - Performing a fourth OCT scan (36) in a second plane (37) which is arranged at a depth distance (T) parallel to the first plane (32), wherein the fourth OCT scan (36) is performed in such a way that only a part of a phakic intraocular lens (26) implanted in the patient's eye (11) and only a part of an anterior capsular bag wall (19) of the patient's eye (11) are captured in the fourth OCT scan (36), 2024P00300WQ-19.01.202617 - Determining a fourth amount (B4) of the first geometric quantity in the fourth OCT scan (36) using the image processing device (5), wherein the first geometric quantity is a second surface (52) or second surface shape between the underside (27) of the phakic intraocular lens (26) and the topside (20) of the anterior capsular bag wall (19), - Calculating a volume using the first surface (50), the second surface (51) and the depth distance (T).
9. A method according to any of the preceding claims, wherein the method comprises the following steps: - Determining the respective curvature of the phakic intraocular lens (26), the anterior capsular bag wall (19) and the cornea (13) in the respective OCT scan (30, 33, 35, 36), - Correcting the first amount (B1) and the second amount (B2) and optionally the fourth amount (B4) taking into account the respective curvature and a predetermined refractive index of the phakic intraocular lens (26), a predetermined refractive index of the anterior capsular bag wall (19) and a predetermined refractive index of the cornea (13).
10. Method according to one of the preceding claims, wherein a prediction of a post-operative final position of the phakic intraocular lens (26) is made based on the first result (E1) and the second result (E2).
11. System (1) for controlling an ophthalmic operating microscope (2), wherein the system (1) comprises: - an ophthalmic operating microscope (2), - an OCT device (3) coupled to the ophthalmic operating microscope (2), - an image processing device (5) for processing an OCT scan (30, 33, 35, 36) created with the OCT device (3), - a calculating device (6) for calculating a result (E1, E2) from data of the OCT scan (30, 33, 35, 36); - an output device (7) for outputting an output, - a control device (10) for controlling the ophthalmic operating microscope (2), the OCT device (3), the image processing device (5), the computing device (6) and the output device (7), 2024P00300WQ-19.01.2026 wherein the system (1) is configured to perform a method according to one of the preceding claims. 2024P00300WO-19.01.2026