A method and device for positioning the cutting center of femtosecond laser refractive surgery

Abstract

The present application discloses a method and apparatus for locating the ablation center of femtosecond laser refractive surgery, which relates to the field of ablation center positioning in refractive surgery. The method comprises obtaining an eye image of a patient in a lying position and a seated position under a set light intensity, and determining a first iris image and a first relative position; determining a second iris image based on the eye image in the lying position; and determining a first eyeball rotation angle based on the first iris image and the second iris image. The method further calculates the second visual axis center and the second relative position of the patient in the ablation, guiding the negative pressure suction. Before the negative pressure suction, after the center of the negative pressure suction ring is aligned with the second visual axis center, if movement occurs, a third iris image is captured during the negative pressure suction process, and then the third visual axis center is calculated. The center of the negative pressure suction ring is aligned with the third visual axis center, and the surgery is performed using the third visual axis center as the ablation center. The present application can accurately locate the ablation center.

Description

Technical Field

[0001] The present application relates to the field of refractive surgery cutting center positioning, and in particular to a femtosecond laser refractive surgery cutting center positioning method and equipment. Background Art

[0002] Femtosecond laser refractive lens extraction is a procedure that uses a femtosecond laser to create a stromal lens in the cornea and then remove it to correct refractive errors such as myopia and astigmatism. The human eye is not a perfectly regular optical system, and there is often some deviation between the pupil center and the visual axis. Using a femtosecond laser to create a lens requires precise alignment of the cutting center with the visual axis, but the visual axis center is more easily observed during surgery. The relative position of the visual axis center and pupil center can be easily determined during preoperative examination, so theoretically, the visual axis center can be determined during surgery based on this relative position and the pupil center. However, the eye rotates during preoperative examination and lies down during surgery, causing the relative position to change. Pupil diameter also affects relative position. The relative position between the visual axis center and pupil center is complicated by the influence of eye rotation and changes in pupil diameter, making manual positioning of the two centers prone to deviation. Summary of the Invention

[0003] The purpose of this application is to provide a method and device for positioning the cutting center in femtosecond laser refractive surgery, so as to realize automatic positioning of the cutting center and improve positioning accuracy.

[0004] To achieve the above objectives, this application provides the following solutions:

[0005] In a first aspect, the present application provides a method for positioning the ablation center in femtosecond laser refractive surgery, comprising:

[0006] Acquire an eye image of a patient in a seated position under a set light intensity, and determine a first iris image and a first relative position; the first relative position is the relative position of a first pupil center and a first visual axis center; the first pupil center is the pupil center of the patient in a seated position looking at a fixation light; the first visual axis center is a coaxial reflection point in the eye image of the patient in the seated position;

[0007] Acquire an eye image of a patient in a lying position to be operated on under a set light intensity;

[0008] determining a second iris image and a second pupil center of the patient to be operated on based on the lying eye image;

[0009] determining a first eyeball rotation angle according to the first iris image and the second iris image;

[0010] Calculating a second visual axis center of the patient to be operated on based on the first pupil center, the first relative position, and the first eyeball rotation angle, and calculating a second relative position between the second visual axis center and the second pupil center; the second visual axis center is the visual axis center of the patient to be operated on in a lying position;

[0011] performing negative pressure suction according to the second relative position guidance;

[0012] Aligning the center of the negative pressure suction ring with the center of the second visual axis, and determining whether the center of the negative pressure suction ring is aligned with the center of the second visual axis;

[0013] If yes, a prompt is given to start negative pressure suction, and a third iris image of the patient to be operated on is obtained under the set light illumination, and the third pupil center is determined;

[0014] Calculating a third visual axis center of the patient to be operated on, and calculating a third relative position between the third visual axis center and the third pupil center, based on the first pupil center, the first relative position, and the second eyeball rotation angle; the second eyeball rotation angle is determined based on the first iris image and the third iris image; the third visual axis center is the visual axis center of the patient to be operated on during the negative pressure aspiration process;

[0015] Determining whether the center of the negative pressure suction ring is aligned with the center of the third visual axis;

[0016] If so, the third visual axis center is used as the cutting center, and the astigmatism axis of the femtosecond laser equipment cutting model is adjusted according to the second eyeball rotation angle, prompting to start laser scanning.

[0017] Optionally, if not, re-perform vacuum suction.

[0018] Optionally, if not, adjust the center of the femtosecond laser device cutting model to the third visual axis center, adjust the astigmatism axis of the cutting model according to the second eyeball rotation angle, and prompt to start laser scanning.

[0019] Optionally, obtaining an eye image of a patient in a seated position for surgery under a set light intensity and determining the first iris image and relative position specifically includes:

[0020] Acquire an eye image of a patient in a sitting position to be operated on under a set light intensity;

[0021] Determining a first pupil diameter, a first iris image, a first pupil center, and a first visual axis center of the patient to be operated on based on the seated eye image;

[0022] A first relative position is determined based on the first pupil center and the first visual axis center.

[0023] Optionally, obtaining an eye image of a patient in a lying position to be operated on under a set light intensity specifically includes:

[0024] The patient to be operated on looks at the fixation light while lying in a lying position in preparation for the operation;

[0025] Adjusting the light brightness to a set light brightness so that the pupil center of the patient to be operated on is consistent with the first pupil center;

[0026] The lying eye image is captured.

[0027] Optionally, determining the first eyeball rotation angle according to the first iris image and the second iris image specifically includes:

[0028] Determining positions of an inner circle and an outer circle in the first iris image and the second iris image, respectively, to obtain a processed first iris image and a processed second iris image; the inner circle being the boundary between the iris and the pupil; and the outer circle being the boundary between the iris and the sclera;

[0029] performing normalization processing on the processed first iris image and the processed second iris image respectively to obtain a normalized first iris image and a normalized second iris image;

[0030] performing image enhancement on the normalized first iris image and the normalized second iris image respectively to obtain an enhanced first iris image and an enhanced second iris image;

[0031] determining an angle of a first iris feature point according to the enhanced first iris image;

[0032] determining a second iris feature point angle according to the enhanced second iris image;

[0033] The first eyeball rotation angle is determined according to the first iris feature point angle and the second iris feature point angle.

[0034] Optionally, determining the first eye rotation angle according to the first iris feature point angle and the second iris feature point angle specifically includes:

[0035] The first eyeball rotation angle is determined using the formula λ1=α-β1, where λ1 is the first eyeball rotation angle; α is the first iris feature point angle; and β1 is the second iris feature point angle.

[0036] Optionally, determining a second eye rotation angle according to the first iris image and the third iris image specifically includes:

[0037] Determining positions of an inner circle and an outer circle in the first iris image and the third iris image, respectively, to obtain a processed first iris image and a processed third iris image; the inner circle being the boundary between the iris and the pupil; and the outer circle being the boundary between the iris and the sclera;

[0038] performing normalization processing on the processed first iris image and the processed third iris image respectively to obtain a normalized first iris image and a normalized third iris image;

[0039] performing image enhancement on the normalized first iris image and the normalized third iris image respectively to obtain an enhanced first iris image and an enhanced third iris image;

[0040] determining an angle of a first iris feature point according to the enhanced first iris image;

[0041] determining an angle of a third iris feature point according to the enhanced third iris image;

[0042] The second eyeball rotation angle is determined according to the first iris feature point angle and the third iris feature point angle.

[0043] Optionally, determining the second eye rotation angle according to the first iris feature point angle and the third iris feature point angle specifically includes:

[0044] The second eyeball rotation angle is determined using the formula λ2=α-β2, where λ2 is the second eyeball rotation angle; α is the first iris feature point angle; and β2 is the third iris feature point angle.

[0045] In a second aspect, the present application provides a computer program product, including a computer program, which, when executed by a processor, implements any of the above-mentioned methods for positioning the cutting center of femtosecond laser refractive surgery.

[0046] According to the specific embodiments provided in this application, this application discloses the following technical effects:

[0047] The present application provides a method and device for positioning the ablation center of femtosecond laser refractive surgery, which obtains an eye image of a patient in a lying position and a sitting position under a set light intensity, and determines a first iris image and a first relative position; determines a second iris image based on the eye image in the lying position; determines a first eyeball rotation angle based on the first iris image and the second iris image, and can further calculate the second visual axis center and the second relative position of the patient to be operated on, guiding negative pressure suction. Before negative pressure suction, after the center of the negative pressure suction ring is aligned with the second visual axis center, if movement occurs, a third iris image is taken during the negative pressure suction process, and then the third visual axis center is calculated. The center of the negative pressure suction ring is aligned to the third visual axis center, and the third visual axis center is used as the ablation center for surgery. The present application improves the accuracy of ablation center positioning by determining the visual axis center of the patient to be operated on in a lying position and using the visual axis center as the ablation center for femtosecond laser refractive surgery. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0049] Figure 1 A schematic flow chart of a method for positioning the ablation center in femtosecond laser refractive surgery provided in one embodiment of the present application;

[0050] Figure 2 A schematic diagram of the structure of a computer device provided in one embodiment of the present application. DETAILED DESCRIPTION

[0051] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0052] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0053] There is usually a certain deviation between the pupil center and the visual axis center of the human eye. When using femtosecond laser to make a lens, the cutting center needs to be accurately aligned with the visual axis center. The relative position relationship between the visual axis center and the pupil center becomes more complicated due to the influence of eye rotation and pupil diameter change. Simply relying on manual positioning by the doctor is prone to deviation. The present invention provides a method for accurately locating the visual axis center point as the center of femtosecond laser scanning to make corneal stroma lenses through image recognition processing, so as to improve the accuracy of positioning the cutting center in femtosecond laser refractive surgery.

[0054] In order to accurately position the needs and make corresponding adjustments. For doctors with high requirements, this application provides a femtosecond laser refractive surgery cutting center positioning method.

[0055] In an exemplary embodiment, Figure 1 As shown, a method for positioning the ablation center of femtosecond laser refractive surgery is provided, comprising the following steps:

[0056] S1: Acquire an eye image of a patient in a sitting position under a set light intensity, and determine a first iris image and a first relative position; the first relative position is the relative position of a first pupil center and a first visual axis center.

[0057] As an optional implementation, S1 specifically includes:

[0058] Acquire an eye image of the patient in the seated position under a set light intensity.

[0059] Based on the sitting eye image, a first pupil diameter, a first iris image, a first pupil center and a first visual axis center of the patient to be operated on are determined.

[0060] A first relative position is determined based on the first pupil center and the first visual axis center.

[0061] S2: Acquire an eye image of a patient in a lying position to be operated on under a set light intensity.

[0062] As an optional implementation, S2 specifically includes:

[0063] The patient to be operated on looks at the fixation light while lying in a lying position in preparation for the operation.

[0064] The light brightness is adjusted to the set light brightness so that the pupil center of the patient to be operated on is consistent with the first pupil center.

[0065] The lying eye image is captured.

[0066] S3: Determine a second iris image and a second pupil center of the patient to be operated on based on the lying eye image.

[0067] S4: Determine a first eyeball rotation angle according to the first iris image and the second iris image.

[0068] As an optional implementation, S4 specifically includes:

[0069] Determine the positions of an inner circle and an outer circle in the first iris image and the second iris image, respectively, to obtain a processed first iris image and a processed second iris image; the inner circle is the boundary between the iris and the pupil; the outer circle is the boundary between the iris and the sclera.

[0070] Normalization processing is performed on the processed first iris image and the processed second iris image respectively to obtain a normalized first iris image and a normalized second iris image.

[0071] Image enhancement is performed on the normalized first iris image and the normalized second iris image to obtain an enhanced first iris image and an enhanced second iris image.

[0072] Determine the angle of the first iris feature point according to the enhanced first iris image.

[0073] Determine the angle of the second iris feature point according to the enhanced second iris image.

[0074] Determining the first eyeball rotation angle according to the first iris feature point angle and the second iris feature point angle specifically includes:

[0075] The first eyeball rotation angle is determined using the formula λ1=α-β1, where λ1 is the first eyeball rotation angle; α is the first iris feature point angle; and β1 is the second iris feature point angle.

[0076] S5: Calculate a second visual axis center of the patient undergoing surgery based on the first pupil center, the first relative position, and the first eye rotation angle, and calculate a second relative position between the second visual axis center and the second pupil center; the second visual axis center is the visual axis center of the patient undergoing surgery in the reclining position. When the patient is in the reclining position gazing at a fixation light directly above them, the coaxial reflective point in the image (this point is at the very center of the image when the patient is fixating on the fixation light directly above them) is defaulted to the visual axis center.

[0077] S6: Perform negative pressure suction according to the second relative position guidance.

[0078] S7: Aligning the center of the negative pressure suction ring with the center of the second visual axis, and determining whether the center of the negative pressure suction ring is aligned with the center of the second visual axis.

[0079] S8: If yes, then a prompt is given to start vacuum aspiration, and a third iris image of the patient to be operated on is obtained under the set light intensity, and the third pupil center is determined. In order to determine whether the visual axis center has shifted during the vacuum aspiration process, a third iris image needs to be taken, and the following steps are performed.

[0080] S9: Calculate a third visual axis center of the patient undergoing surgery based on the first pupil center, the first relative position, and the second eye rotation angle, and calculate a third relative position between the third visual axis center and the third pupil center; the second eye rotation angle is determined based on the first iris image and the third iris image; the third visual axis center is the visual axis center of the patient undergoing surgery during the negative pressure aspiration process. The calculation principle of the second eye rotation angle is the same as the calculation principle of the first eye rotation angle.

[0081] As an optional implementation manner, determining the second eye rotation angle according to the first iris image and the third iris image specifically includes:

[0082] Determine the positions of an inner circle and an outer circle in the first iris image and the third iris image, respectively, to obtain a processed first iris image and a processed third iris image; the inner circle is the boundary between the iris and the pupil; the outer circle is the boundary between the iris and the sclera.

[0083] Normalization processing is performed on the processed first iris image and the processed third iris image respectively to obtain a normalized first iris image and a normalized third iris image.

[0084] Image enhancement is performed on the normalized first iris image and the normalized third iris image to obtain an enhanced first iris image and an enhanced third iris image.

[0085] Determine the angle of the first iris feature point according to the enhanced first iris image.

[0086] Determine the angle of the third iris feature point according to the enhanced third iris image.

[0087] Determining the second eye rotation angle according to the first iris feature point angle and the third iris feature point angle specifically includes:

[0088] The second eyeball rotation angle is determined using the formula λ2=α-β2, where λ2 is the second eyeball rotation angle; α is the first iris feature point angle; and β2 is the third iris feature point angle.

[0089] S10: Determine whether the center of the negative pressure suction ring is aligned with the center of the third visual axis.

[0090] S11: If yes, the third visual axis center is used as the cutting center, and the astigmatism axis position of the femtosecond laser device cutting model is adjusted according to the second eyeball rotation angle, and a prompt is given to start laser scanning.

[0091] If not, perform negative pressure suction again, or adjust the center of the femtosecond laser cutting model to the center of the third visual axis, adjust the astigmatism axis of the cutting model according to the second eye rotation angle, and prompt to start laser scanning.

[0092] This provides a relatively clear and reliable third visual axis center point, also known as the ablation center. The eye's rotation angle is also determined when the patient is lying in the surgical position, providing an accurate reference for the ablation center and rotation angle for the next step of laser ablation treatment.

[0093] The following is a detailed description of the femtosecond laser refractive surgery ablation center positioning method of the present application:

[0094] Step 1: Obtain the relative position of the patient to be operated on, and record the light brightness, the first pupil diameter and the first iris image.

[0095] Step 2: Have the patient to be operated on observe the fixation light, and have the patient lie down. Adjust the light brightness so that the diameter of the second pupil is consistent with the diameter of the first pupil in the sitting position.

[0096] Step 3: Have the patient to be operated on look at the fixation light, take an eye image in the lying position, and compare it with the eye image in the sitting position to obtain the first eye rotation angle.

[0097] In this embodiment, femtosecond laser refractive surgery is performed using a VISX STAR S4 excimer laser device, which determines the eye rotation angle based on the eye rotation angle acquisition method described in "Wavefront-Guided Refractive Surgery".

[0098] Step 4: Have the patient to be operated on look at the fixation light, identify the second pupil center, and locate the second visual axis center and the second relative position between the second visual axis center and the second pupil center based on the eye rotation angle and the first relative position.

[0099] Step 5: Confirm that the patient to be operated on is looking at the fixation light, move the laser emission window closer to the eyeball, and perform negative pressure suction according to the second relative position guidance.

[0100] Step 6: Before starting the vacuum suction, determine whether the center of the vacuum suction ring is aligned with the center of the second visual axis. If so, proceed to step 7.

[0101] Step seven: start the negative pressure suction. In order to determine whether the visual axis center shifts during the negative pressure suction process, obtain the third iris image of the patient to be operated on under the set light brightness and determine the third pupil center.

[0102] Step 8: Based on the first pupil center, the first relative position, and the second eye rotation angle, calculate the third visual axis center of the patient undergoing surgery, and calculate the third relative position between the third visual axis center and the third pupil center. The calculation principle of the second eye rotation angle is the same as the calculation principle of the first eye rotation angle.

[0103] Step 9: Determine whether the center of the vacuum suction ring is aligned with the center of the third visual axis. If so, proceed to step 10. If the center of the vacuum suction ring is aligned with the center of the third visual axis, it means that the center of the visual axis has not shifted during the vacuum suction process and the surgery can be performed.

[0104] Step 10: Use the third visual axis center as the cutting center, adjust the astigmatism axis of the femtosecond laser equipment cutting model according to the second eyeball rotation angle, and start the laser scanning to perform femtosecond laser surgery.

[0105] This application achieves precise positioning of the visual axis center and achieves the expected precise correction effect.

[0106] In an exemplary embodiment, a computer device is provided. The computer device may be a server or a terminal. The internal structure diagram thereof may be as follows: Figure 2 As shown. The computer device includes a processor, a memory, an input / output interface (Input / Output, abbreviated as I / O) and a communication interface. The processor, memory and input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and computer program in the non-volatile storage medium. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a method for positioning the cutting center of femtosecond laser refractive surgery is implemented.

[0107] Those skilled in the art will understand that Figure 2 The structure shown in the figure is merely a block diagram of a portion of the structure related to the present application solution and does not constitute a limitation on the computer device to which the present application solution is applied. A specific computer device may include more or fewer components than shown in the figure, or combine certain components, or have a different component arrangement. In an exemplary embodiment, a computer device is provided, including a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, it implements the above-mentioned femtosecond laser refractive surgery ablation center positioning method.

[0108] In an exemplary embodiment, a computer-readable storage medium is provided, storing a computer program, which, when executed by a processor, implements the above-mentioned method for positioning the ablation center of femtosecond laser refractive surgery.

[0109] In an exemplary embodiment, a computer program product is provided, comprising a computer program, which, when executed by a processor, implements the above-mentioned method for positioning the ablation center in femtosecond laser refractive surgery.

[0110] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant regulations.

[0111] Those skilled in the art will understand that all or part of the processes in the above-mentioned embodiment methods can be implemented by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, database or other media used in the embodiments provided in this application may include at least one of non-volatile and volatile memory. Non-volatile memory may include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory may include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM may be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM).

[0112] The databases involved in the various embodiments provided herein may include at least one of a relational database and a non-relational database. Non-relational databases may include, but are not limited to, distributed databases based on blockchains. The processors involved in the various embodiments provided herein may include, but are not limited to, general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic units, data processing logic units based on quantum computing, and the like.

[0113] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0114] This document uses specific examples to illustrate the principles and implementation methods of this application. The description of the above examples is only intended to help understand the method and core concept of this application. At the same time, for those skilled in the art, based on the concept of this application, there may be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting this application.

Claims

1. A computer device comprising: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement a method for locating the ablation center of femtosecond laser refractive surgery, wherein the method comprises: Acquire an eye image of a patient in a seated position under a set light intensity, and determine a first iris image and a first relative position; the first relative position is the relative position of a first pupil center and a first visual axis center; the first pupil center is the pupil center of the patient in a seated position looking at a fixation light; the first visual axis center is a coaxial reflection point in the eye image of the patient in the seated position; Acquire an eye image of a patient in a lying position to be operated on under a set light intensity; determining a second iris image and a second pupil center of the patient to be operated on based on the lying eye image; determining a first eyeball rotation angle according to the first iris image and the second iris image; Calculating a second visual axis center of the patient to be operated on based on the first pupil center, the first relative position, and the first eyeball rotation angle, and calculating a second relative position between the second visual axis center and the second pupil center; the second visual axis center is the visual axis center of the patient to be operated on in a lying position; performing negative pressure suction according to the second relative position guidance; Aligning the center of the negative pressure suction ring with the center of the second visual axis, and determining whether the center of the negative pressure suction ring is aligned with the center of the second visual axis; If yes, a prompt is given to start negative pressure suction, and a third iris image of the patient to be operated on is obtained under the set light illumination, and the third pupil center is determined; Calculating a third visual axis center of the patient to be operated on, and calculating a third relative position between the third visual axis center and the third pupil center, based on the first pupil center, the first relative position, and the second eyeball rotation angle; the second eyeball rotation angle is determined based on the first iris image and the third iris image; the third visual axis center is the visual axis center of the patient to be operated on during the negative pressure aspiration process; Determining whether the center of the negative pressure suction ring is aligned with the center of the third visual axis; If so, the third visual axis center is used as the cutting center, and the astigmatism axis of the femtosecond laser equipment cutting model is adjusted according to the second eyeball rotation angle, prompting to start laser scanning.

2. The computer device according to claim 1, wherein: If not, perform vacuum suction again.

3. The computer device according to claim 1, wherein: If not, adjust the center of the femtosecond laser cutting model to the third visual axis center, adjust the astigmatism axis of the cutting model according to the second eye rotation angle, and prompt to start laser scanning.

4. The computer device according to claim 1, wherein: Acquiring an eye image of a patient in a seated position for surgery under a set light intensity and determining a first iris image and a relative position, specifically including: Acquire an eye image of a patient in a sitting position to be operated on under a set light intensity; Determining a first pupil diameter, a first iris image, a first pupil center, and a first visual axis center of the patient to be operated on based on the seated eye image; A first relative position is determined based on the first pupil center and the first visual axis center.

5. The computer device according to claim 1, wherein: Acquire an eye image of a patient in a lying position awaiting surgery under a set light intensity, specifically including: The patient to be operated on looks at the fixation light while lying in a lying position in preparation for the operation; Adjusting the light brightness to a set light brightness so that the pupil center of the patient to be operated on is consistent with the first pupil center; The lying eye image is captured.

6. The computer device according to claim 1, wherein: Determining a first eye rotation angle according to the first iris image and the second iris image specifically includes: Determining positions of an inner circle and an outer circle in the first iris image and the second iris image, respectively, to obtain a processed first iris image and a processed second iris image; the inner circle being the boundary between the iris and the pupil; and the outer circle being the boundary between the iris and the sclera; performing normalization processing on the processed first iris image and the processed second iris image respectively to obtain a normalized first iris image and a normalized second iris image; performing image enhancement on the normalized first iris image and the normalized second iris image respectively to obtain an enhanced first iris image and an enhanced second iris image; determining an angle of a first iris feature point according to the enhanced first iris image; determining a second iris feature point angle according to the enhanced second iris image; The first eyeball rotation angle is determined according to the first iris feature point angle and the second iris feature point angle.

7. The computer device according to claim 6, wherein: Determining the first eyeball rotation angle according to the first iris feature point angle and the second iris feature point angle specifically includes: The first eyeball rotation angle is determined using the formula λ1=α-β1, where λ1 is the first eyeball rotation angle; α is the first iris feature point angle; and β1 is the second iris feature point angle.

8. The computer device according to claim 1, wherein: Determining a second eye rotation angle according to the first iris image and the third iris image specifically includes: Determining positions of an inner circle and an outer circle in the first iris image and the third iris image, respectively, to obtain a processed first iris image and a processed third iris image; the inner circle being the boundary between the iris and the pupil; and the outer circle being the boundary between the iris and the sclera; performing normalization processing on the processed first iris image and the processed third iris image respectively to obtain a normalized first iris image and a normalized third iris image; performing image enhancement on the normalized first iris image and the normalized third iris image respectively to obtain an enhanced first iris image and an enhanced third iris image; determining an angle of a first iris feature point according to the enhanced first iris image; determining an angle of a third iris feature point according to the enhanced third iris image; The second eyeball rotation angle is determined according to the first iris feature point angle and the third iris feature point angle.

9. The computer device according to claim 8, wherein: Determining the second eye rotation angle according to the first iris feature point angle and the third iris feature point angle specifically includes: The second eyeball rotation angle is determined using the formula λ2=α-β2, where λ2 is the second eyeball rotation angle; α is the first iris feature point angle; and β2 is the third iris feature point angle.

Images