Method, device and electronic equipment for measuring depth

Abstract

The application provides a measurement method and device of axial depth and electronic equipment. The method comprises the following steps: obtaining an anterior segment image, and determining a sclera anterior surface and a cornea anterior surface of the anterior segment image; determining a length of a target line segment and an inclination angle of the target line segment; the two ends of the target line segment are in contact with the sclera anterior surface respectively; and determining the axial depth based on the target line segment and the cornea anterior surface. In this way, the axial depth of a patient can be measured automatically, a suitable scleral lens is provided for the patient, the speed and accuracy of lens fitting by a doctor are increased, the lens fitting time is reduced, and the experience of the patient is improved.

Description

Technical Field

[0001] This invention relates to the field of depth of sagitta measurement technology, and in particular to a method, apparatus and electronic device for measuring depth of sagitta. Background Technology

[0002] Scleral lenses are large-diameter rigid contact lenses that, unlike traditional contact lenses, land on the sclera (the white part of the eye) rather than the cornea. They are commonly used to treat keratoconus, irregular astigmatism, and severe dry eye, and offer better vision and comfort compared to other vision correction methods.

[0003] Scleral lenses can be divided into mini-scleral lenses and macro-scleral lenses. A mini-scleral lens is defined as a lens that is 6 mm larger than the horizontally visible iris diameter (HVID), while a macro-scleral lens is defined as a lens that is more than 6 mm larger than the HVID. For a cornea with an HVID of 11.90 mm, the diameter of a mini-scleral lens is approximately 16 mm to 18 mm, while the diameter of a macro-scleral lens is approximately 18 mm to 24 mm.

[0004] For successful scleral lens fitting, the lens should completely clear 360° of the cornea and limbus (with no pressure or support on any surface) and provide sufficient apical clearance to form a tear reservoir beneath the lens and in front of the eye. The optimal apical clearance is 200-250 μm immediately after wearing the lens and 100-150 μm after two hours. The lens should also be evenly pressed against the conjunctival tissue above the sclera around the periphery to prevent conjunctival redness or whitening of conjunctival vessels. Therefore, selecting the appropriate sagittal height is crucial for scleral lens fitting.

[0005] Currently, the trial lens method is the most commonly used method for scleral lens fitting in clinical practice. Clinicians manually measure the corneal sagitta at a fixed chord length, and then determine the sagitta of the trial lens based on the actual diameter of the scleral lens, plus an empirical value of a few hundred micrometers. Because scleral morphology varies greatly from person to person, this sagitta measurement method is an indirect estimation and cannot be precisely measured. Furthermore, manual measurement of the sagitta introduces errors from different measurers, ultimately leading to adjustments to the trial lens, increased fitting time, and a decreased patient experience. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to provide a method, device and electronic device for measuring sagittal depth, so as to automatically measure the sagittal depth of a patient, provide the patient with a suitable scleral lens, increase the speed and accuracy of doctors fitting scleral lenses, reduce fitting time and improve the patient experience.

[0007] In a first aspect, embodiments of the present invention provide a method for measuring sagittal depth, the method comprising: acquiring an anterior segment image; determining the anterior scleral surface and anterior corneal surface of the anterior segment image; determining the length and tilt angle of a target line segment; having both ends of the target line segment contact the anterior scleral surface; and determining the sagittal depth based on the target line segment and the anterior corneal surface.

[0008] In an optional embodiment of this application, the above-mentioned step of obtaining an anterior segment image includes: determining the corneal apex of the patient as the scanning center, and each scan line emitted by the OCT device passing through the scanning center to obtain an anterior segment image corresponding to each scan line.

[0009] In an optional embodiment of this application, the step of determining the tilt angle of the target line segment includes: identifying eye tissue in the anterior segment image and determining the tilt angle based on the angle between the identified eye tissue and the horizontal plane.

[0010] In an optional embodiment of this application, the step of identifying ocular tissue in the anterior segment image and determining the tilt angle based on the angle between the identified ocular tissue and the horizontal plane includes: identifying two scleral ridges in the anterior segment image; and taking the angle between the line connecting the two scleral ridges and the horizontal direction as the tilt angle.

[0011] In an optional embodiment of this application, the step of identifying eye tissue in the anterior segment image and determining the tilt angle based on the angle between the identified eye tissue and the horizontal plane includes: identifying the iris in the anterior segment image, fitting the iris to obtain an iris plane; and using the angle between the iris plane and the horizontal direction as the tilt angle.

[0012] In an optional embodiment of this application, the step of identifying ocular tissue in the anterior segment image and determining the tilt angle based on the angle between the identified ocular tissue and the horizontal plane includes: identifying the corneal vertex along the optical axis in the anterior segment image and determining the angle between the tangent in the direction of the corneal vertex and the horizontal plane as the tilt angle.

[0013] In an optional embodiment of this application, the length of the target line segment is less than or equal to the maximum diameter of the scleral lens; the angle between the target line segment and the horizontal direction is equal to the tilt angle.

[0014] In an optional embodiment of this application, the method further includes: determining the length of the target line segment based on the landing zone of the sclera; the length of the target line segment is less than or equal to the maximum diameter of the sclera, the length of the target line segment is greater than or equal to the minimum value of the landing zone diameter of the sclera, and the landing zone diameter is the diameter of the sclera with its endpoint within the landing zone.

[0015] In an optional embodiment of this application, the step of determining the length of the target line segment based on the landing zone diameter of the sclerafoil includes: the length of the target line segment being equal to the minimum value of the landing zone diameter of the sclerafoil.

[0016] In an optional embodiment of this application, the step of determining the depth of sagittal based on the target line segment and the anterior corneal surface includes: determining the maximum distance from each point on the anterior corneal surface to the target line segment, and using the maximum distance as the depth of sagittal.

[0017] In an optional embodiment of this application, the method further includes: determining the distance from the corneal vertex of the anterior segment image to the target line segment as the sagittal depth.

[0018] In optional embodiments of this application, the above method further includes: using the sum of the sagittal depth and the tear film thickness as the sagittal height of the sclera lens; and determining the target sclera lens based on the sagittal height of the sclera lens.

[0019] In optional embodiments of this application, the above method further includes: determining the scleral angle based on the target line segment and the anterior surface of the sclera; and determining the target scleral lens based on the sag of the scleral lens and the scleral angle.

[0020] In optional embodiments of this application, the above method further includes: acquiring a first number of anterior segment images, establishing a three-dimensional model based on the first number of anterior segment images; determining a second number of anterior segment images based on the three-dimensional model, and determining a second number of scleral lens heights for each of the second number of anterior segment images; wherein the second number is greater than the first number; and determining the final scleral lens height based on the scleral lens heights of the second number of scleral lenses.

[0021] In an optional embodiment of this application, the step of determining the final sagittal of the sclera based on the sagittal of the second number of sclera, includes: taking any one of the average, maximum, and minimum values ​​of the sagittal of the second number of sclera as the final sagittal of the sclera.

[0022] Secondly, embodiments of the present invention also provide a depth-of-sagittal measurement device, the device comprising: an anterior segment image acquisition module, used to acquire an anterior segment image and determine the anterior scleral surface and anterior corneal surface of the anterior segment image; a target line segment determination module, used to determine the length of the target line segment and the tilt angle of the target line segment; the two ends of the target line segment respectively contact the anterior scleral surface; and a depth-of-sagittal determination module, used to determine the depth-of-sagittal based on the target line segment and the anterior corneal surface.

[0023] Thirdly, embodiments of the present invention also provide an electronic device, including a processor and a memory, wherein the memory stores computer-executable instructions that can be executed by the processor, and the processor executes the computer-executable instructions to implement the above-described method for measuring depth vectors.

[0024] The embodiments of the present invention bring the following beneficial effects:

[0025] This invention provides a method, apparatus, and electronic device for measuring sagittal depth. The method involves acquiring an anterior segment image, determining the anterior scleral and anterior corneal surfaces of the anterior segment image, determining the length and tilt angle of a target line segment, ensuring both ends of the target line segment contact the anterior scleral surface, and determining the sagittal depth based on the target line segment and the anterior corneal surface. This method can automatically measure a patient's sagittal depth, providing appropriate scleral lenses, increasing the speed and accuracy of scleral lens fitting for doctors, reducing fitting time, and improving the patient experience.

[0026] Other features and advantages of this disclosure will be set forth in the following description, or some features and advantages may be inferred from the description or determined without doubt, or may be learned by practicing the techniques described above.

[0027] To make the above-mentioned objects, features and advantages of this disclosure more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0028] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of a scleral lens and an eye provided in an embodiment of the present invention;

[0030] Figure 2 A flowchart illustrating a method for measuring depth vectors according to an embodiment of the present invention;

[0031] Figure 3 A schematic diagram of an anterior segment image provided in an embodiment of the present invention;

[0032] Figure 4 A flowchart of another method for measuring depth vector provided in an embodiment of the present invention;

[0033] Figure 5 A schematic diagram illustrating the determination of the tilt angle based on the scleral protuberance, provided as an embodiment of the present invention;

[0034] Figure 6 A schematic diagram of an eye tissue provided in an embodiment of the present invention;

[0035] Figure 7 A schematic diagram illustrating the determination of tilt angle based on the iris, provided as an embodiment of the present invention;

[0036] Figure 8A schematic diagram of the corneal apex, optical axis, and visual axis provided for an embodiment of the present invention;

[0037] Figure 9 A schematic diagram illustrating the determination of the tilt angle based on the corneal apex, provided as an embodiment of the present invention;

[0038] Figure 10 A schematic diagram of a central area, a transition area, and a landing area provided in an embodiment of the present invention;

[0039] Figure 11 A schematic diagram illustrating the determination of a depth vector according to an embodiment of the present invention;

[0040] Figure 12 This is a schematic diagram illustrating another method for determining the depth vector according to an embodiment of the present invention.

[0041] Figure 13 A schematic diagram of the structure of a depth-of-sagitth measurement device provided in an embodiment of the present invention;

[0042] Figure 14 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present invention. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0044] See Figure 1 The diagram illustrates a scleral lens fitting a 360° area around the eye. For successful fitting, the lens should completely clear the cornea and limbus (without pressure or support on any surface) and provide sufficient apical clearance to create a tear reservoir beneath the lens and in front of the eye. The optimal apical clearance is 200-250 μm immediately after insertion and 100-150 μm after two hours. The lens should also be evenly pressed against the conjunctival tissue above the sclera to prevent conjunctival redness or whitening of conjunctival vessels. Therefore, selecting the appropriate sagittal height is crucial for scleral lens fitting.

[0045] Currently, the trial lens method is the most commonly used method for fitting scleral lenses in clinical practice. Clinicians manually measure the corneal sagitta at a fixed chord length, and then determine the sagitta of the trial lens based on the actual diameter of the scleral lens, plus an empirical value of a few hundred micrometers. Because scleral morphology varies greatly from person to person, this sagitta measurement method is an indirect estimation and cannot be precisely measured. Furthermore, manual measurement of the sagitta introduces errors from different measurers, ultimately leading to adjustments to the trial lens, increased fitting time, and a decreased patient experience.

[0046] Based on this, embodiments of the present invention provide a method, apparatus, and electronic device for measuring sagittal depth, specifically providing a method for automatically measuring the sagittal depth of the anterior segment, which can automatically measure the patient's sagittal depth, provide the patient with a suitable scleral lens, increase the speed and accuracy of doctors fitting scleral lenses, reduce fitting time, and improve the patient's experience.

[0047] To facilitate understanding of this embodiment, a method for measuring depth vectors disclosed in this embodiment of the invention will first be described in detail.

[0048] Example 1:

[0049] This invention provides a method for measuring depth vectors, see [link to relevant documentation]. Figure 2 The flowchart shown illustrates a method for measuring depth of sagitta, which includes the following steps:

[0050] Step S202: Obtain an anterior segment image and determine the anterior scleral and anterior corneal surfaces of the anterior segment image.

[0051] In this embodiment, OCT (Optical Coherence Tomography) images, slit-lamp images, ultrasound images, and Scheimpflug camera images of the patient's anterior segment can be acquired as anterior segment images to identify ocular tissues in the anterior segment images, thereby determining the anterior scleral and anterior corneal surfaces of the anterior segment images.

[0052] See also Figure 3 The diagram shown is a schematic representation of an anterior segment image. Figure 3 The image shows the anterior surface of the sclera, the anterior sclera, and the scleral spur.

[0053] Step S204: Determine the length and tilt angle of the target line segment; both ends of the target line segment are in contact with the anterior surface of the sclera.

[0054] In this embodiment, the length and tilt angle of the target line segment can be determined first. The target line segment has two endpoints that contact the anterior surface of the sclera in the anterior segment image. The tilt angle of the target line segment can be defined as the angle between the target line segment and the horizontal plane (or the horizontal axis, the horizontal direction), that is, the angle between the target line segment and the horizontal direction is equal to the tilt angle. After determining the length and tilt angle of the target line segment, its position can be determined from the anterior segment image.

[0055] like Figure 3 As shown, after determining the length of the target line segment to be x and the tilt angle to be b°, the position of the target line segment A can be determined from the anterior segment image.

[0056] Step S206: Determine the sagittal depth based on the target line segment and the anterior corneal surface.

[0057] After determining the location of the target line segment and the anterior corneal surface, this embodiment can use the distance from the target line segment to the anterior corneal surface as the depth of sagittal. As shown in Figure 3, the distance from the target line segment A to the anterior corneal surface can be used as the depth of sagittal.

[0058] Furthermore, when recommending scleral lenses in the future, this embodiment can determine the sagittal height of the scleral lens based on the aforementioned sagittal depth, and recommend the scleral lens based on the sagittal height of the scleral lens, thereby realizing automatic measurement of the patient's sagittal depth and providing the patient with a suitable scleral lens.

[0059] This invention provides a method for measuring sagittal depth. The method involves acquiring an anterior segment image, determining the anterior scleral and anterior corneal surfaces of the anterior segment image, determining the length and tilt angle of a target line segment, ensuring both ends of the target line segment contact the anterior scleral surface, and determining the sagittal depth based on the target line segment and the anterior corneal surface. This method can automatically measure a patient's sagittal depth, providing appropriate scleral lenses, increasing the speed and accuracy of scleral lens fitting for doctors, reducing fitting time, and improving the patient experience.

[0060] Example 2:

[0061] This embodiment provides a method for measuring depth vectors, which is implemented based on the above embodiments, such as... Figure 4 The flowchart of another method for measuring the depth of vector is shown. The method for measuring the depth of vector in this embodiment includes the following steps:

[0062] Step S402: The corneal apex of the patient is determined as the scanning center. Each scan line emitted by the OCT device passes through the scanning center to obtain the anterior segment image corresponding to each scan line.

[0063] In this embodiment, the scanning center can be determined using anterior segment images or images acquired by a pupil camera. Each scan line emitted by the OCT device must pass through the scanning center to obtain the anterior segment image corresponding to each scan line. For example, the OCT image acquired by the OCT device can be used as the anterior segment image. The OCT image can be a B-scan image or a three-dimensional volumetric data image.

[0064] Preferably, the imaging mode of the optical coherence tomography device in this embodiment can be a star-shaped scanning mode, which may include a pair of mutually perpendicular scanning lines.

[0065] Step S404: Determine the anterior scleral surface and the anterior scleral surface of the anterior segment image.

[0066] After acquiring the anterior segment image, this embodiment can identify the ocular tissues in the anterior segment image through image recognition. The identified anterior segment image includes the anterior surface of the sclera and the anterior surface of the sclera.

[0067] Step S406: Determine the length and tilt angle of the target line segment; both ends of the target line segment are in contact with the anterior surface of the sclera.

[0068] In some embodiments, eye tissue in an anterior segment image can be identified, and the tilt angle can be determined based on the angle between the identified eye tissue and the horizontal plane.

[0069] In this embodiment, ocular tissues (e.g., scleral spurs, iris, corneal apex, etc.) in the anterior segment image can be identified, and the angle between the identified ocular tissues and the horizontal plane is used as the tilt angle.

[0070] (1) It can identify two scleral ridges in the anterior segment image; the angle between the line connecting the two scleral ridges and the horizontal direction is taken as the tilt angle.

[0071] See Figure 5 The diagram illustrates a method for determining the tilt angle based on the scleral ridges. The tilt angle can be defined as the angle b between the line B connecting the two scleral ridges and the horizontal direction X. See also... Figure 6 The diagram illustrates an ocular structure. Since the intersection of the boundary between the sclera and ciliary body and the extended line of the inner surface of the cornea is the location of the scleral spur, which is an anatomical structure, this embodiment can use a point in the image determined by a segmentation algorithm as the target location of the scleral spur, and then use the line connecting two target locations as the line connecting the scleral spur.

[0072] (2) It can identify the iris in the anterior segment image, fit the iris to obtain the iris plane, and use the angle between the iris plane and the horizontal direction as the tilt angle. See also Figure 7The diagram shows a method for determining the tilt angle based on the iris. In this embodiment, the iris in the anterior segment image can be identified first. Since the surface of the iris is uneven, the identified iris can be fitted to obtain the iris plane Z. The angle b between the iris plane Z and the horizontal direction X is taken as the tilt angle.

[0073] (3) It can identify the corneal vertex along the optical axis in the anterior segment image and determine the angle between the tangent in the direction of the corneal vertex and the horizontal plane as the tilt angle.

[0074] Among them, see Figure 8 The diagram shown illustrates the corneal apex, optical axis, and visual axis. Figure 8 The diagram shows the first corneal vertex, the second corneal vertex, the optical axis direction, and the visual axis.

[0075] See Figure 9 The diagram shows a method for determining the tilt angle based on the corneal vertex. In this embodiment, the corneal vertex along the optical axis in the anterior segment image can be identified first, and the angle b between the tangent P in the direction of the corneal vertex and the horizontal plane X can be taken as the tilt angle.

[0076] Therefore, in this embodiment, the tilt angle can be determined based on the angle between the eye tissues (e.g., scleral spur, iris, corneal apex, etc.) identified from the anterior segment image and the horizontal plane. The method of determining the scleral lens based on the tilt angle can make the final determined scleral lens fit the shape of the eye better, thereby improving the patient's user experience.

[0077] In this embodiment, some rules can be followed when determining the length of the target line segment, such as: the length of the target line segment is less than or equal to the maximum diameter of the scleral lens. For example, assuming the maximum diameter of the scleral lens is 15cm, then the length of the target line segment is less than or equal to 15cm. In some embodiments, the length of the target line segment can be determined based on the landing zone of the scleral lens; the length of the target line segment is less than or equal to the maximum diameter of the scleral lens, and the length of the target line segment is greater than or equal to the minimum value of the landing zone diameter of the scleral lens, where the landing zone diameter is the diameter of the scleral lens whose endpoint is within the landing zone.

[0078] In this embodiment, the diameter of the scleraoscope, whose endpoint is the boundary point of the landing zone, is also the diameter of the landing zone. See also... Figure 10 The diagram shows a central zone, transition zone, and landing zone. Figure 10 In this diagram, 1 represents the central zone, 2 represents the transition zone, and 3 represents the landing zone. The landing zone diameter of a scleral lens refers to the total diameter of all scleral lenses within the landing zone. Figure 10 The two solid black lines shown represent the landing zone diameters of the two scleral lenses. The minimum landing zone diameter is [value missing]. Figure 10In the diagram, line segment A1A2 represents the upper edge of the landing zone. Due to the design of the scleral lens, its maximum diameter can be greater than or equal to the maximum diameter of the scleral lens landing zone. The maximum diameter of the scleral lens landing zone is... Figure 10 (Line segment B1B2 in the diagram, where B1 and B2 are the lower edges of the landing area).

[0079] Preferably, the length of the target line segment is equal to the minimum diameter of the landing zone of the scleral lens. When the length of the target line segment is less than or equal to the diameter of the landing zone of the scleral lens, the fit between the scleral lens and the sclera is better, resulting in a better patient experience.

[0080] In this embodiment, the position of the target line segment can be determined by translation. For example, first draw a straight line 'a' with an angle equal to the inclination angle to the horizontal plane. Then, translate line 'a' upwards or downwards and determine the two intersection points A and B between the translated line 'a' and the anterior surface of the sclera. Determine whether the length of line segment AB is the length of the target line segment. If yes, then line segment AB is the target line segment; otherwise, continue translating line 'a' upwards or downwards until the length of line segment AB is determined to be the length of the target line segment.

[0081] Step S408: Determine the sagittal depth based on the target line segment and the anterior corneal surface.

[0082] In some embodiments, the maximum distance from each point on the anterior surface of the cornea to the target line segment can be determined, and the maximum distance can be used as the depth of sagittal.

[0083] See Figure 11 The diagram shown illustrates a method for determining the depth of sagittal. First, n points A1-An on the anterior surface of the cornea can be determined. Then, the distances a1 from A1 to the target line segment, a2 from A2 to the target line segment, ..., an from An to the target line segment A can be determined respectively. The maximum value of a1-an is the maximum distance, so the maximum value of a1-an can be used as the depth of sagittal.

[0084] Furthermore, in some embodiments, the distance from the corneal vertex of the anterior segment image to the target line segment can also be determined as the depth of sagitta. When determining the corneal vertex of the anterior segment image, the distance from the corneal vertex to the target line segment can be directly used as the depth of sagitta. See also Figure 12 The diagram shows another way to determine the depth of sagitta. After determining the corneal vertex P, the distance from the corneal vertex P to the target line segment A can be directly used as the depth of sagitta.

[0085] After determining the sagittal depth, this embodiment can recommend a scleral lens based on the sagittal depth. For example, the sum of the sagittal depth and the thickness of the tear film lens can be used as the sagittal height of the scleral lens; the target scleral lens can be determined based on the sagittal height of the scleral lens.

[0086] like Figure 1 As shown, the scleral lens is not flush against the cornea; there should be a certain gap between the scleral lens and the cornea to serve as a tear film lens (i.e., Figure 1 (The reservoir in the tear film). Therefore, this embodiment can predetermine the tear film thickness, use the sum of the sagittal depth and the tear film thickness as the sagittal height of the scleral lens, and then determine the target scleral lens based on the sagittal height of the scleral lens, recommending a target scleral lens with a suitable sagittal height to the patient, thereby improving the patient's experience.

[0087] Besides the sagittal height, the scleral angle is also an important parameter of the scleral lens. In some embodiments, the scleral angle can be determined based on the target line segment and the anterior surface of the sclera; the target scleral lens is determined based on the sagittal height and scleral angle of the scleral lens.

[0088] In this embodiment, the angle between the target line segment and the anterior surface of the sclera can be used as the scleral angle. The target scleral lens is determined based on the sacral height and the scleral angle, and a target scleral lens with suitable sacral height and scleral angle is recommended to the patient, thereby improving the patient's experience.

[0089] Furthermore, since the anterior segment image is an image of a single cross-section of the eyeglass, different cross-sections may have different sagittal heights. Therefore, this embodiment can also acquire a first number of multiple anterior segment images, establish a three-dimensional model based on the first number of multiple anterior segment images, determine a second number of anterior segment images based on the three-dimensional model, and determine a second number of scleral lens sagittal heights for each of the second number of anterior segment images; wherein the second number is greater than the first number; and determine the final sagittal height of the scleral lens based on the sagittal heights of the second number of scleral lenses.

[0090] For example, in this embodiment, 16 anterior segment images (16 images in total) can be acquired first, and a three-dimensional model can be built based on these 16 images. Then, 360 anterior segment images (360 images in total) can be determined from the three-dimensional model, and the sagittal height of each of the 360 ​​scleral lenses can be determined.

[0091] In some embodiments, the average, maximum, and minimum values ​​of the sagittal height of the second number of scleral lenses can be used as the final sagittal height of the scleral lens.

[0092] If the second quantity is 360, in this embodiment, any one of the average, maximum, and minimum values ​​of the sagittal height of the 360 ​​scleral lenses can be used as the final sagittal height of the scleral lens.

[0093] Compared to directly determining the 16 scleral lens sagittas from 16 anterior segment images (a first quantity of 16), the method described in this embodiment can obtain 360 scleral lens sagittas, thereby determining a more accurate final scleral lens sagitta.

[0094] The method described in this embodiment can determine the tilt angle based on identified eye tissue in multiple ways, thereby determining the position of the target line segment, automatically measuring the patient's sagittal depth, and determining the sagittal height of the scleral lens. Furthermore, it can determine the sagittal height of a larger number of scleral lenses by establishing a three-dimensional model, thus determining a more accurate final sagittal height for the scleral lens. A suitable target scleral lens is provided to the patient based on the scleral lens sagittal height or based on both the scleral lens sagittal height and scleral angle. This increases the speed and accuracy of scleral lens fitting for doctors, reduces fitting time, and improves the patient experience.

[0095] Example 3:

[0096] Corresponding to the above method embodiments, this invention provides a device for measuring depth vectors, see [link to relevant documentation]. Figure 13 The diagram shows a structural schematic of a depth-of-sagitth measurement device, which includes:

[0097] The anterior segment image acquisition module 1301 is used to acquire an anterior segment image and determine the anterior scleral surface and anterior corneal surface of the anterior segment image;

[0098] The target line segment determination module 1302 is used to determine the length and tilt angle of the target line segment; the two ends of the target line segment are in contact with the anterior surface of the sclera respectively;

[0099] The depth determination module 1303 is used to determine the depth of the sagittal based on the target line segment and the anterior surface of the cornea.

[0100] This invention provides a device for measuring sagittal depth. It acquires an anterior segment image, determines the anterior scleral and anterior corneal surfaces of the anterior segment image, determines the length and tilt angle of a target line segment, and ensures that both ends of the target line segment contact the anterior scleral surface. Based on the target line segment and the anterior corneal surface, the sagittal depth is determined. This method can automatically measure the patient's sagittal depth, providing appropriate scleral lenses, increasing the speed and accuracy of scleral lens fitting for doctors, reducing fitting time, and improving the patient experience.

[0101] The aforementioned anterior segment image acquisition module is used to determine the patient's corneal apex as the scanning center. Each scan line emitted by the OCT device passes through the scanning center, thus obtaining the anterior segment image corresponding to each scan line.

[0102] The aforementioned target line segment determination module is used to identify eye tissue in the anterior segment image and determine the tilt angle based on the angle between the identified eye tissue and the horizontal plane.

[0103] The aforementioned target line segment determination module is used to identify two scleral ridges in the anterior segment image; the angle between the line connecting the two scleral ridges and the horizontal direction is used as the tilt angle.

[0104] The aforementioned target line segment determination module is used to identify the iris in the anterior segment image, fit the iris to obtain the iris plane, and use the angle between the iris plane and the horizontal direction as the tilt angle.

[0105] The aforementioned target line segment determination module is used to identify the corneal vertex along the optical axis in the anterior segment image and determine the angle between the tangent in the direction of the corneal vertex and the horizontal plane as the tilt angle.

[0106] The length of the target line segment is less than or equal to the maximum diameter of the scleral lens; the angle between the target line segment and the horizontal direction is equal to the tilt angle.

[0107] The aforementioned target line segment determination module is also used to determine the length of the target line segment based on the landing zone of the sclera; the length of the target line segment is less than or equal to the maximum diameter of the sclera, and the length of the target line segment is greater than or equal to the minimum value of the landing zone diameter of the sclera; the landing zone diameter is the diameter of the sclera whose endpoint is within the landing zone.

[0108] The aforementioned target line segment determination module is used to determine the minimum length of the target line segment, which is equal to the landing zone diameter of the scleral lens.

[0109] The aforementioned depth-of-sagittal (DOS) determination module is used to determine the maximum distance from each point on the anterior surface of the cornea to the target line segment, and the maximum distance is used as the DOS.

[0110] The aforementioned depth-of-sagittal determination module is also used to determine the distance from the corneal vertex of the anterior segment image to the target line segment as the depth-of-sagittal.

[0111] The aforementioned device further includes: a target scleral lens determination module, used to take the sum of the sagittal depth and the tear film thickness as the sagittal height of the scleral lens; and to determine the target scleral lens based on the sagittal height of the scleral lens.

[0112] The aforementioned target scleral lens determination module is also used to determine the scleral angle based on the target line segment and the anterior surface of the sclera; and to determine the target scleral lens based on the sag and scleral angle of the scleral lens.

[0113] The aforementioned device further includes: a final sagittal determination module, used to acquire a first number of anterior segment images, establish a three-dimensional model based on the first number of anterior segment images; determine a second number of anterior segment images based on the three-dimensional model, and determine the sagittal of a second number of scleral lenses for each of the second number of anterior segment images; wherein the second number is greater than the first number; and determine the final sagittal of the scleral lens based on the sagittal of the second number of scleral lenses.

[0114] The aforementioned final sagittal determination module is used to take any one of the average, maximum, and minimum sagittal values ​​of the second number of scleral lenses as the final sagittal of the scleral lens.

[0115] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working process of the above-described depth measurement device can be referred to the corresponding process in the embodiments of the aforementioned depth measurement method, and will not be repeated here.

[0116] Example 4:

[0117] This invention also provides an electronic device for performing the above-described depth-of-sagitth measurement method; see [link to previous document]. Figure 14 The diagram shows the structure of an electronic device, which includes a memory 100 and a processor 101. The memory 100 stores one or more computer instructions, which are executed by the processor 101 to implement the aforementioned method for measuring depth.

[0118] Furthermore, Figure 14 The electronic device shown also includes a bus 102 and a communication interface 103, with the processor 101, the communication interface 103 and the memory 100 connected via the bus 102.

[0119] The memory 100 may include high-speed random access memory (RAM) or non-volatile memory, such as at least one disk storage device. Communication between this system network element and at least one other network element is achieved through at least one communication interface 103 (which can be wired or wireless), such as the Internet, wide area network, local area network, or metropolitan area network. The bus 102 may be an ISA bus, PCI bus, or EISA bus, etc. The bus can be divided into address bus, data bus, control bus, etc. For ease of representation, Figure 14 The symbol is represented by a single double-headed arrow, but this does not mean that there is only one bus or one type of bus.

[0120] Processor 101 may be an integrated circuit chip with signal processing capabilities. In implementation, each step of the above method can be completed by the integrated logic circuitry in the hardware of processor 101 or by instructions in software form. Processor 101 can be a general-purpose processor, including a Central Processing Unit (CPU), a Network Processor (NP), etc.; it can also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field-Programmable Gate Array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of this invention. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the methods disclosed in the embodiments of this invention can be directly manifested as execution by a hardware decoding processor, or execution by a combination of hardware and software modules in the decoding processor. The software module can reside in a readily available storage medium in the art, such as random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, or registers. This storage medium is located in memory 100, and processor 101 reads information from memory 100 and, in conjunction with its hardware, completes the steps of the method described in the foregoing embodiments.

[0121] This invention also provides a computer-readable storage medium storing computer-executable instructions. When these computer-executable instructions are called and executed by a processor, they cause the processor to implement the aforementioned depth-of-vector measurement method. For specific implementation details, please refer to the method embodiments, which will not be repeated here.

[0122] The method, apparatus, and electronic device for measuring depth vector provided in the embodiments of the present invention include a computer-readable storage medium storing program code. The instructions included in the program code can be used to execute the methods in the preceding method embodiments. For specific implementation details, please refer to the method embodiments, which will not be repeated here.

[0123] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working process of the system and / or device described above can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0124] Furthermore, in the description of the embodiments of the present invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention based on the specific circumstances.

[0125] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this invention, essentially, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0126] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0127] Finally, it should be noted that the above-described embodiments are merely specific implementations of the present invention, used to illustrate the technical solutions of the present invention, and not to limit it. The scope of protection of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments within the technical scope disclosed in the present invention, or make equivalent substitutions for some of the technical features; and these modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for measuring depth of vector, characterized in that, The method includes: Acquire an anterior segment image and determine the anterior scleral and anterior corneal surfaces of the anterior segment image; The length of the target line segment and the tilt angle of the target line segment are determined; the two ends of the target line segment respectively contact the anterior surface of the sclera; Determine the sagittal depth based on the target line segment and the anterior surface of the cornea; The step of determining the tilt angle of the target line segment includes: identifying eye tissue in the anterior segment image, and determining the tilt angle based on the angle between the identified eye tissue and the horizontal plane; The method further includes: determining the length of the target line segment based on the landing zone of the sclera; the length of the target line segment is less than or equal to the maximum diameter of the sclera, the length of the target line segment is greater than or equal to the minimum value of the landing zone diameter of the sclera, and the landing zone diameter is the diameter of the sclera with its endpoint within the landing zone. The method further includes: determining the position of the target line segment in the anterior segment image using the length of the target line segment, the tilt angle of the target line segment, and the contact between the two ends of the target line segment and the anterior surface of the sclera as constraints.

2. The method according to claim 1, characterized in that, The steps to obtain an anterior segment image include: The patient's corneal apex is determined as the scanning center. Each scan line emitted by the OCT device passes through the scanning center to obtain an anterior segment image corresponding to each scan line.

3. The method according to claim 1, characterized in that, The step of identifying ocular tissue in the anterior segment image and determining the tilt angle based on the angle between the identified ocular tissue and the horizontal plane includes: Identify two scleral spurs in the anterior segment image; The angle between the line connecting the two scleral ridges and the horizontal direction is taken as the tilt angle.

4. The method according to claim 1, characterized in that, The step of identifying ocular tissue in the anterior segment image and determining the tilt angle based on the angle between the identified ocular tissue and the horizontal plane includes: Identify the iris in the anterior segment image and fit the iris to obtain an iris plane; The angle between the iris plane and the horizontal direction is taken as the tilt angle.

5. The method according to claim 1, characterized in that, The step of identifying ocular tissue in the anterior segment image and determining the tilt angle based on the angle between the identified ocular tissue and the horizontal plane includes: Identify the corneal vertex along the optical axis in the anterior segment image, and determine the angle between the tangent in the direction of the corneal vertex and the horizontal plane as the tilt angle.

6. The method according to claim 1, characterized in that, The length of the target line segment is less than or equal to the maximum diameter of the scleral lens; the angle between the target line segment and the horizontal direction is equal to the tilt angle.

7. The method according to claim 1, characterized in that, The step of determining the length of the target line segment based on the landing zone diameter of the scleral lens includes: The length of the target line segment is equal to the minimum diameter of the landing zone of the scleral lens.

8. The method according to claim 1, characterized in that, The step of determining the sagittal depth based on the target line segment and the anterior corneal surface includes: Determine the maximum distance from each point on the anterior surface of the cornea to the target line segment, and use the maximum distance as the depth of vectors.

9. The method according to claim 1, characterized in that, The method further includes: The distance from the corneal vertex of the anterior segment image to the target line segment is determined as the depth of vector.

10. The method according to claim 1, characterized in that, The method further includes: The sum of the sagittal depth and the tear film thickness is taken as the sagittal height of the scleral lens; The target sclera is determined based on the sagittal height of the sclera.

11. The method according to claim 10, characterized in that, The method further includes: The scleral angle is determined based on the target line segment and the anterior surface of the sclera; The target scleral lens is determined based on the scleral lens's sagittal height and the scleral angle.

12. The method according to claim 1, characterized in that, The method further includes: Acquire a first number of anterior segment images, and build a three-dimensional model based on the first number of anterior segment images; Based on the three-dimensional model, a second number of anterior segment images are determined, and for each of the second number of anterior segment images, the sagitta of the second number of scleral lenses is determined; wherein, the second number is greater than the first number; The final sagitta of the sclera is determined based on the sagitta of the second number of sclera.

13. The method according to claim 12, characterized in that, The step of determining the final sagittal of the sclera based on the sagittal of the second number of sclera lenses includes: The final sagittal of the second number of scleral lenses is taken as any one of the average, maximum, and minimum values ​​of their sagittal height.

14. A device for measuring depth, characterized in that, The device includes: An anterior segment image acquisition module is used to acquire an anterior segment image and determine the anterior scleral surface and anterior corneal surface of the anterior segment image; A target line segment determination module is used to determine the length of the target line segment and the tilt angle of the target line segment; the two ends of the target line segment are respectively in contact with the anterior surface of the sclera; A depth-of-sagittal determination module is used to determine the depth-of-sagittal based on the target line segment and the anterior surface of the cornea; The target line segment determination module is used to identify eye tissue in the anterior segment image and determine the tilt angle based on the angle between the identified eye tissue and the horizontal plane. The target line segment determination module is further configured to determine the length of the target line segment based on the landing zone of the sclera; the length of the target line segment is less than or equal to the maximum diameter of the sclera, and the length of the target line segment is greater than or equal to the minimum value of the landing zone diameter of the sclera; the landing zone diameter is the diameter of the sclera whose endpoint is within the landing zone. The target line segment determination module is further configured to determine the position of the target line segment in the anterior segment image using the length of the target line segment, the tilt angle of the target line segment, and the contact between the two ends of the target line segment and the anterior surface of the sclera as constraints.

15. An electronic device, characterized in that, It includes a processor and a memory, the memory storing computer-executable instructions that can be executed by the processor, the processor executing the computer-executable instructions to implement the depth-of-sagitth measurement method according to any one of claims 1 to 13.

Images