Fundus camera and control method

Abstract

The invention provides a fundus camera and a control method, and the fundus camera is characterized in that the fundus camera comprises a function module, a camera body, and a lighting device, an imaging device and a driving device which are installed on the camera body; wherein the driving device is connected with the lighting device and the imaging device, and is used for controlling the lighting device and the imaging device to move on the machine body; the functional module is detachably connected to the machine body, and the functional module comprises at least one of a slit lamp module and a dry eye detection module; the fundus camera has a first working state, a second working state and a third working state, and in the first working state, the fundus camera is used for fundus retina imaging; in the second working state, the slit lamp module is connected to the machine body, and the fundus camera is used for slit lamp shooting; in the third working state, the dry eye detection module is connected to the machine body, and the fundus camera is used for ocular surface dry eye detection.

Description

Technical Field

[0001] This application relates to the field of medical detection technologies, and particularly to a fundus camera and a control method thereof. Background Art

[0002] With the progress of technology and the changes in social demands, modern medical devices are developing towards being more intelligent, miniaturized, and multifunctional. Traditional medical instruments usually focus on the design of a single function. For example, a fundus camera dedicated to fundus retina imaging or a slit lamp microscope for anterior segment eye examinations. Such single-function medical instruments cannot satisfy patients' examinations of multiple items such as the retina, cornea, and lens at one time, and multiple devices need to cooperate. Moreover, traditional devices are highly specialized, large in size, and expensive in cost, and are not suitable for daily use. Patients often need to go to professional medical institutions for examinations, resulting in the inability to detect diseases in a timely manner. Summary of the Invention

[0003] To solve the problem that traditional medical instruments with single functions are not suitable for daily use, this application is implemented as follows:

[0004] In a first aspect, the present invention provides a fundus camera, including: a functional module, a body, and an illumination device, an imaging device, and a driving device mounted on the body; wherein,

[0005] The driving device is connected to the illumination device and the imaging device, and is used to control the illumination device and the imaging device to move on the body;

[0006] The functional module is detachably connected to the body, and the functional module includes at least one of a slit lamp module and a dry eye detection module;

[0007] The fundus camera has a first working state, a second working state, and a third working state. In the first working state, the fundus camera is used for fundus retina imaging; in the second working state, the slit lamp module is connected to the body, and the fundus camera is used for slit lamp photography; in the third working state, the dry eye detection module is connected to the body, and the fundus camera is used for ocular surface dry eye detection.

[0008] Optionally, the slit lamp module includes a first housing and a slit lamp, a fixation lamp, a diffuser, and a switching gear provided on the first housing. The first housing is detachably connected to the body. The first housing has a through hole, and the through hole is opposite to the imaging device. The fixation lamp is disposed on one side of the through hole, and the light emitted by the slit lamp exits from the other side of the through hole;

[0009] The slit lamp module has a slit light mode and a diffused light mode. The switching gear is respectively connected to the slit lamp and the diffusing sheet, and is used to control the switching of the slit lamp module between the slit light mode and the diffused light mode;

[0010] In the slit light mode, the slit lamp emits slit light, and the diffusing sheet is away from the slit light; in the diffused light mode, the slit lamp emits diffused light, and the diffused light passes through the diffusing sheet and exits.

[0011] Optionally, the dry eye detection module includes a second housing detachably connected to the body. A Placido ring is provided on the second housing. The Placido ring is opposite to the lighting device, and the center of the Placido ring is opposite to the imaging device. The thickness of the second housing increases in the direction from the outer ring to the inner ring of the Placido ring, so that the brightness of the light emitted by the lighting device through each ring of the Placido ring is uniform.

[0012] Optionally, the dry eye detection module further includes a supplementary lighting device, which is disposed opposite to the Placido ring.

[0013] Optionally, the body is provided with a first mechanical connector and a first electronic connector, and the corresponding positions of the functional module are provided with a second mechanical connector and a second electronic connector. The first mechanical connector and the second mechanical connector are connected to mount the functional module on the imaging device. The first electronic connector and the second electronic connector are electrically connected to detect the type of the functional module, so that the driving device controls the movement of the lighting device and the imaging device on the body according to the type of the functional module.

[0014] Optionally, the first mechanical connector and the second mechanical connector include at least one of a snap connector and a magnetic connector.

[0015] Optionally, the first electronic connector and the second electronic connector are contact pins, including: a power supply pin, a type discrimination pin, and a brightness control pin.

[0016] In a second aspect, the present invention provides a method for controlling a fundus camera, including:

[0017] Obtaining the connection information of the functional module on the body;

[0018] Adjust the fundus camera to a working state adapted to the connection information of the functional module. The working state includes at least one of a first working state, a second working state, and a third working state. In the first working state, the fundus camera is used for fundus retina imaging. In the second working state, the fundus camera is used for slit lamp photography. In the third working state, the fundus camera is used for dry eye detection.

[0019] Optionally, the connection information of the functional module includes: not connected to the functional module, connected to the slit lamp module, and connected to the dry eye detection module.

[0020] Adjusting the fundus camera to a working state adapted to the connection information of the functional module includes:

[0021] When the connection information of the functional module is not connected to the functional module, adjust the fundus camera to the first working state.

[0022] When the connection information of the functional module is connected to the slit lamp module, adjust the fundus camera to the second working state.

[0023] When the connection information of the functional module is connected to the dry eye detection module, adjust the fundus camera to the third working state.

[0024] Optionally, the step of adjusting the fundus camera to the first working state includes:

[0025] Control the driving device to drive the lighting device and the imaging device to move to a first preset position, and switch the imaging parameters of the imaging device to first imaging parameters for fundus retina imaging.

[0026] Optionally, the step of adjusting the fundus camera to the second working state includes:

[0027] Control the driving device to drive the lighting device and the imaging device to move to a second preset position, and switch the imaging parameters of the imaging device to second imaging parameters for slit lamp photography.

[0028] Optionally, the step of adjusting the fundus camera to the third working state includes:

[0029] Control the driving device to drive the lighting device and the imaging device to move to a third preset position, and switch the imaging parameters of the imaging device to third imaging parameters for dry eye detection.

[0030] An embodiment of the present invention provides a fundus camera and a control method. A slit lamp module, a dry eye detection module and other functional modules are detachably arranged on the fundus camera, so as to integrate multiple ophthalmic examination functions on one fundus camera. A driving device is used to control the movement of an illumination device and an imaging device to switch between different working states, enabling multiple functional modules to share one imaging device, realizing the intelligentization, miniaturization and multi-functionality of the device, ensuring high-precision medical imaging quality while taking into account portability and ease of use, and facilitating popularization in daily household use. Description of the Drawings

[0031] Figure 1 It is a schematic diagram of the slit lamp module according to an embodiment of the present invention;

[0032] Figure 2 It is a schematic diagram of the dry eye detection module according to an embodiment of the present invention;

[0033] Figure 3 It is a schematic diagram of the connection structure between the fundus camera and the functional module according to an embodiment of the present invention;

[0034] Figure 4 It is a schematic diagram of the contact pin signal transmission according to an embodiment of the present invention;

[0035] Figure 5 It is a step flowchart of the control method according to an embodiment of the present invention;

[0036] Figure 6 It is a flowchart of the second working state according to an embodiment of the present invention;

[0037] Figure 7 It is a flowchart of the third working state according to an embodiment of the present invention.

[0038] Reference Signs:

[0039] 10: Slit lamp module; 11: Fixation lamp; 12: Switching gear; 13: First housing; 20: Dry eye detection module; 21: Placido ring; 22: Second housing; 30: First mechanical connector; 40: First electronic connector; 50: Body. Detailed Embodiments

[0040] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0041] It should be understood that the "one embodiment" or "an embodiment" mentioned throughout the specification means that the specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the present invention. Therefore, the "in one embodiment" or "in an embodiment" that appears throughout the specification does not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner.

[0042] In various embodiments of the present invention, it should be understood that the magnitudes of the serial numbers of the following processes do not mean the order of execution. The order of execution of each process should be determined by its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.

[0043] Embodiment 1

[0044] The present invention provides a fundus camera, comprising: a functional module, a body 50, and a lighting device, an imaging device, and a driving device mounted on the body 50; wherein, the driving device is connected to the lighting device and the imaging device for controlling the movement of the lighting device and the imaging device on the body 50; the functional module is detachably connected to the body 50, and the functional module includes at least one of a slit lamp module 10 and a dry eye detection module 20; the fundus camera has a first working state, a second working state, and a third working state. In the first working state, the fundus camera is used for fundus retina imaging; in the second working state, the slit lamp module 10 is connected to the body 50, and the fundus camera is used for slit lamp photography; in the third working state, the dry eye detection module 20 is connected to the body 50, and the fundus camera is used for ocular surface dry eye detection.

[0045] The fundus camera at least includes a body 50, and a lighting device, an imaging device, and a driving device mounted on the body 50. One surface of the body 50 where the imaging device is provided has a shape that fits the human eye socket. The user presses the fundus camera tightly against the eye socket to form a dark room in the eye area. There is a light passing hole in the center of the body 50. The light passing hole, the lighting device, and the imaging device are arranged in a straight line. The light emitted by the lighting device exits through the light passing hole to illuminate the user's eyeball. The light reflected by the eyeball enters the imaging device through the light passing hole. The imaging device collects an image of the eye and inputs the image into a processor for analysis to complete the detection of the eye.

[0046] Specifically, advanced three-dimensional mechanical structures are used to connect the various components, which can support precise adjustment at different angles and positions under the action of the driving device. This structure is composed of a precision-machined metal frame, and contains multiple joint components with adjustable axial and radial degrees of freedom inside, ensuring that the device can move flexibly in a narrow space while maintaining high stability. This design enables doctors or users to perform high-quality fundus photography from different perspectives, improving the diagnostic accuracy.

[0047] To achieve automated operation, an efficient drive device is built into the fundus camera. It can drive the lighting device and the imaging device to move according to the built-in algorithm, and automatically complete operations such as focusing and photographing on the corresponding parts.

[0048] A lighting device is provided inside the fuselage 50, which can emit infrared light and white light. The human eye is insensitive to infrared light and cannot feel its presence. When using infrared light for illumination, the pupil will not contract due to stimulation as it does under visible light. This helps to keep the pupil in a natural state during the examination, enabling better fundus observation and shooting conditions without the use of mydriatic drugs, reducing the impact of drug mydriasis on human health, and also improving the convenience and comfort of the examination. Infrared light is also used for auxiliary focusing and positioning. Under infrared light, the fundus tissue has a certain reflectivity, which enables the camera to clearly see the general outline and structure of the fundus, facilitating the operator to accurately focus on and position the fundus, ensuring that a clear and complete fundus image is captured. White light is used to provide sufficient illumination during the imaging stage, making the details of the fundus clearly visible to capture high-quality fundus images.

[0049] The imaging device includes a photosensitive element and an optical lens group, and has the characteristics of ultra-high resolution, wide dynamic range, and low noise. It can not only capture clear and delicate fundus images, but also automatically adjust the sensitivity according to the ambient light conditions to ensure the consistency and reliability of the image quality.

[0050] In the case of not installing any functional module, the fundus camera enters the first working state, and the lighting device, imaging device, and drive device provided inside the fuselage 50 can achieve the fundus photographing function.

[0051] After the light entering the eye irradiates the fundus tissue, it will be reflected or scattered by various structures of the fundus. For example, different tissues such as blood vessels and nerve fibers on the retina have different reflection and scattering characteristics for light, which makes the reflected and scattered light carry information such as the morphology and structure of the fundus tissue. The reflected and scattered light passes through the refractive system of the eyeball again, such as the lens, and then enters the imaging device of the fundus camera. The lens in the imaging device is responsible for focusing these lights so that the image of the fundus clearly falls on the photosensitive element. The photosensitive element is generally a charge-coupled device (CCD) or a complementary metal-oxide semiconductor (CMOS), which can convert the received optical signal into an electrical signal.

[0052] The electrical signal generated by the photosensitive element is processed by the internal circuit and image processing chip of the fundus camera, including operations such as amplifying the signal, reducing noise, and color restoration. Finally, the electrical signal is converted into a digital signal and stored and displayed in a certain image format, thereby generating a fundus image that can be observed and analyzed by doctors.

[0053] On one side of the fuselage 50 where there is a light-passing hole, a connecting device is further provided for installing a functional module. In this embodiment, the functional module includes at least one of a slit lamp module 10 and a dry eye detection module 20. By configuring different functional modules, the fundus camera can have different detection functions. It can be understood that the fundus camera switches to the corresponding working state by detecting the type of the functional module. When the slit lamp module 10 is detected, the fundus camera switches to the second working state. When the dry eye detection module 20 is detected, the fundus camera switches to the third working state. In different working states, the angles and positions of the lighting device and the imaging device need to be adjusted accordingly to meet the lighting and imaging conditions required for different detection items.

[0054] In some alternative embodiments, as Figure 1 shown, the slit lamp module 10 includes a first housing 13 and a slit lamp (disposed inside the first housing 13, not shown in the figure), a fixation lamp 11, a diffuser (disposed inside the first housing 13, not shown in the figure), and a switching gear 12. The first housing 13 is detachably connected to the fuselage 50. The first housing 13 has a through hole opposite to the imaging device. The fixation lamp 11 is disposed on one side of the through hole. The light emitted by the slit lamp exits from the other side of the through hole. The slit lamp module 10 has a slit light mode and a diffused light mode. The switching gear 12 is respectively connected to the slit lamp and the diffuser. The switching gear 12 is used to control the switching of the slit lamp module 10 between the slit light mode and the diffused light mode. In the slit light mode, the slit lamp emits slit light, and the diffuser is away from the slit light. In the diffused light mode, the slit lamp emits diffused light, and the diffused light passes through the diffuser and exits.

[0055] Traditional slit lamp instruments consist of an illumination system and a binocular microscope. The illumination system projects a slit light band onto the eye to form an optical section, which can clearly show tissues at different levels of the eye. The binocular microscope provides a magnified and stereoscopic observation effect. Doctors can adjust the magnification and focus of the microscope to carefully observe the morphology, structure, color, transparency, etc. of various tissues in the eye, so as to detect whether there are lesions or abnormalities.

[0056] In this embodiment, the imaging device of the fundus camera can replace the binocular microscope of the traditional slit lamp. The imaging of the lens slit image and the diffuse light eye surface image is performed by the imaging device of the fundus camera, and there is no need to add optical components for imaging in the slit lamp module 10. Special slit light and diffuse light are required for slit lamp examination. In fact, the slit light and diffuse light are light bands with different widths formed by changing the shape of the light transmission hole. The slit light is a narrow slit light that can penetrate the lens to form a light section plane, and the diffuse light is a circular light spot that can illuminate the surface of the eyeball. The slit lamp module 10 performs a complete examination of the anterior segment structures such as the eyelid, conjunctiva, cornea, sclera, anterior chamber, iris, pupil, and lens through two modes of slit light and diffuse light. The built-in lighting device of the fundus camera cannot form the above-mentioned light bands with different widths, so a separate lighting needs to be set in the slit lamp module 10.

[0057] The lighting system of the slit lamp module 10 includes a high-intensity LED light source array and a series of adjustable light hardware drive circuits for generating uniform and stable light beams. The entire slit lamp module 10 is made of lightweight materials and is connected and fixed to the fundus camera, which not only does not affect the functional integrity of the original equipment but also realizes quick disassembly, installation, and maintenance.

[0058] The slit lamp module 10 can capture lens slit images and diffuse light eye surface images. A switching gear 12 for switching between slit light and diffuse light is provided on the surface of the slit lamp module 10. The diffuse light sheet eye surface shooting and lens slit shooting can be switched with each other by a lever. In the diffuse light mode, the slit lamp switches the illumination to the eye surface illumination, and at the same time, the diffuse light sheet cuts into the illumination optical path to output diffuse light; in the slit light mode, the slit lamp switches the illumination to the slit illumination, and at the same time, the diffuse light sheet cuts out of the illumination optical path to output slit light. The role of the diffuse light sheet in the optical path is to reduce the brightness of the light and avoid damage to the user's eyes caused by too strong light in the diffuse light mode, which affects the imaging effect.

[0059] At the same time, in order to guide the eyes of the person being photographed during the shooting process and avoid frequent eye rotation, which may affect the shooting, an LED fixation lamp 11 is designed at a specified position in the module imaging optical path. When the user takes a photo, the user's eyes are guided to fix on the fixation lamp 11 to improve the shooting success rate.

[0060] The slit lamp module 10 performs imaging based on the fundus camera imaging system, and the two share the same imaging optical path. This integration not only simplifies the device structure, reduces the volume and weight, but also ensures the consistency and accuracy of high-resolution image acquisition from the eye surface to the fundus. In this way, multiple ophthalmic examinations can be completed using a single system, improving the diagnostic efficiency and convenience.

[0061] In some alternative embodiments, the dry eye detection module 20 includes a second housing 22 detachably connected to the fuselage 50. A Placido ring 21 is provided on the second housing 22. The Placido ring 21 is opposite to the lighting device, and the center of the Placido ring 21 is opposite to the imaging device. The thickness of the second housing 22 increases in the direction from the outer ring to the inner ring of the Placido ring 21, so that the brightness of the light emitted by the lighting device through each ring of the Placido ring is uniform.

[0062] As Figure 2 shown, a Placido ring 21 is provided at the center of the second housing 22. The Placido ring is the core structure in the dry eye detection module 20 and is composed of multiple black and white concentric rings. When it is projected onto the cornea, the flatness of the cornea is analyzed by observing the shape of the Placido ring image on the cornea. In the fundus camera of this embodiment, the imaging device collects the image data formed by the corneal reflected light, and then uses computer analysis software to process and analyze these data, so as to draw a three-dimensional structure diagram of the cornea, intuitively showing the morphological changes on the corneal surface.

[0063] It should be noted that the unprocessed light emitted by the lighting device is radial, and the light spot formed on the eye surface is also uneven. In the natural state, the light intensity at the edge of the light spot is significantly weaker than the light intensity at the center of the light spot, and the image brightness formed on the eye surface is uneven, affecting the imaging quality. To solve this problem, the dry eye detection module 20 introduces lighting into the module through a transparent light guide column at one end close to the imaging device, and at the same time optimizes the light transmission intensity of the Placido ring according to the light intensity distribution inside the module. In specific applications, this intensity optimization is manifested as the thickness of the second housing 22 increasing in the direction from the outer ring to the inner ring of the Placido ring 21, ensuring that the brightness of each ring irradiated on the eye pupil is uniform and sufficient, the black and white ring intervals formed by the collected images are consistent, the brightness is uniform, the boundary is clear, and the contrast is good.

[0064] The dry eye detection module 20 also performs imaging based on the fundus camera imaging system and shares the imaging optical path. This not only simplifies the device structure, reduces the volume and weight, but also ensures the consistency and accuracy of obtaining high-resolution images from the ocular surface to the fundus. In this way, multiple ophthalmic examinations can be completed using a single system, improving the diagnostic efficiency and convenience.

[0065] In some alternative embodiments, as Figure 2 shown, the dry eye detection module 20 further includes a supplementary lighting device, and the supplementary lighting device is disposed opposite to the Placido ring 21.

[0066] The Placido ring 21 has a certain thickness, and the thickness changes with the distance between the ring and the center of the circle. Inevitably, while uniformizing the light, the intensity of the light will be weakened. The imaging effect that could originally achieve a good result may deteriorate after the weakening of the illumination intensity. When the light intensity emitted by the illumination device built into the fundus camera cannot meet the higher imaging requirements, a supplementary illumination device needs to be added to the dry eye detection module 20 to make the light projected onto the surface of the user's eyeball have sufficient brightness, provide high-quality images, and ensure the accuracy of the detection results.

[0067] In some alternative embodiments, a first mechanical connector 30 and a first electronic connector 40 are provided on the body 50, and second mechanical and electronic connectors are provided at corresponding positions of the functional module. The first mechanical connector 30 is connected to the second mechanical connector for mounting the functional module on the imaging device. The first electronic connector 40 is electrically connected to the second electronic connector for detecting the type of the functional module, so that the driving device controls the illumination device and the imaging device to move on the body 50 according to the type of the functional module.

[0068] As Figure 3 shown, the first mechanical connector 30 and the second mechanical connector are respectively provided on the surfaces where the body 50 and the functional module are connected to achieve the mechanical connection between the body 50 and the functional module. First and second electronic connectors are also provided to supply power to the functional module and conduct signal transmission to obtain the connection information of the functional module on the body 50 and the state parameters of the functional module. After being analyzed and processed by the processor, the illumination device and the imaging device are controlled to adjust parameters to switch to the corresponding working state and perform shooting.

[0069] Optionally, the first mechanical connector 30 and the second mechanical connector include at least one of a snap connector and a magnetic connector. It neither affects the functional integrity of the original device nor realizes quick disassembly, assembly, and maintenance. To ensure reliable installation and good signal contact, the functional module acts through the snap method and the magnetic attraction method together to ensure installation reliability.

[0070] Optionally, the first electronic connector 40 and the second electronic connector are contact pins, including: a power supply pin, a type discrimination pin, and a brightness control pin.

[0071] As Figure 4As shown, the first electronic connector 40 and the second electronic connector each have 4 pins. The power supply pin PWM in the first electronic connector 40 is connected to the lighting system LED in the functional module, and is used to control the turning on and off of the lighting systems such as the slit lamp, the fixation lamp 11, and the supplementary lighting device. The brightness control pin LED can control the turning on and off of the slit lamp illumination and output different brightness levels. When a supplementary lighting device is provided in the dry eye detection module 20, the brightness control pin is also used to control the turning on and off and the brightness of the supplementary lighting device.

[0072] There are two groups of type discrimination pins in total. The access status of the functional module is distinguished by 2 groups of IOs, which can be used to distinguish 4 states respectively, one is the non-access default state, and three are valid types. Both PI3 and PI4 output high-level signals, indicating that the functional module is not currently connected. The fundus camera is set to the first working state, which can also be considered the default working state of the fundus camera; PI3 outputs a low-level signal and PI4 outputs a high-level signal, indicating that the slit lamp module 10 is currently connected, and the fundus camera switches to the second working state for slit lamp shooting; PI3 outputs a high-level signal and PI4 outputs a low-level signal, indicating that the dry eye detection module 20 is currently connected, and the fundus camera switches to the third working state for dry eye detection.

[0073] The GND pin serves as the return path for the current in the circuit, enabling the current to flow out from the positive pole of the power supply, pass through each component in the circuit, and then flow back to the negative pole of the power supply through the GND pin, thus forming a closed loop.

[0074] It should be noted that although in this embodiment, the connection information of the functional module can be obtained through the type discrimination pins to identify the type of the functional module, and then control the fundus camera to switch to the corresponding working state to achieve automatic adjustment, it does not exclude that the user can manually select and switch between the various working states. A display screen and control buttons are provided on the control terminal of the fundus camera, and the user can complete the type identification of the functional module in a manual input manner.

[0075] The embodiment of the present invention provides a fundus camera, on which functional modules such as a slit lamp module 10 and a dry eye detection module 20 are detachably provided, realizing the integration of multiple eye examination functions on one fundus camera. The driving device is used to control the movement of the lighting device and the imaging device to switch between different working states, enabling multiple functional modules to share one imaging device, achieving the intelligentization, miniaturization, and multi-functionality of the device, which can not only ensure high-precision medical imaging quality but also take into account portability and ease of use, and is convenient for popularization in daily home use.

[0076] Embodiment Two

[0077] A control method according to an embodiment of the present invention is a control method applicable to a fundus camera, which can integrate multiple eye detection functions on a single fundus camera to perform examinations of multiple items, such as Figure 1 The schematic diagram of Figure 1 gives the flowchart of this control method:

[0078] Step S501, obtain the connection information of the functional modules on the body.

[0079] Specifically, the connection information of the functional modules includes: unconnected functional modules, connected slit lamp modules, and connected dry eye detection modules.

[0080] The fundus camera can automatically obtain the connection information of the functional modules on the body by receiving the signals transmitted by the contact pins connecting the body and the functional modules, identify the access status and type of the functional modules, or receive the information manually input by the user to obtain the connection information of the functional modules on the body.

[0081] In this embodiment, a slit lamp module and a dry eye detection module are mainly integrated. In the case of setting other types of modules, the connection information of the functional modules is correspondingly increased to realize the identification of the functional modules and the switching of the working states.

[0082] Step S502, adjust the fundus camera to a working state adapted to the connection information of the functional modules. The working state includes at least one of a first working state, a second working state, and a third working state. In the first working state, the fundus camera is used for fundus retina imaging. In the second working state, the fundus camera is used for slit lamp photography. In the third working state, the fundus camera is used for dry eye detection.

[0083] Adjusting the fundus camera to a working state adapted to the connection information of the functional modules includes:

[0084] In the case where the connection information of the functional modules is unconnected functional modules, adjust the fundus camera to the first working state; in the case where the connection information of the functional modules is connected slit lamp modules, adjust the fundus camera to the second working state; in the case where the connection information of the functional modules is connected dry eye detection modules, adjust the fundus camera to the third working state.

[0085] It should be noted that the step of adjusting the fundus camera to the first working state includes: controlling the driving device to drive the lighting device and the imaging device to move to the first preset position, and switching the imaging parameters of the imaging device to the first imaging parameters for fundus retina imaging.

[0086] In the first working state, i.e., the fundus photography mode, the fundus camera is normally powered on, and the lighting device and the imaging device are located at the preset initial positions. If it is detected that the lighting device and the imaging device are not at the initial positions, the driving device controls the lighting device and the imaging device to move to the initial positions to complete the first alignment. Then, the lighting device is turned on, the infrared light is turned on, and an eye image is acquired. The position of the eye is analyzed based on the ocular surface image and the preset data and algorithms, and the lens center of the imaging device is controlled to align with the pupil center to complete the second alignment. The main camera can be turned on to see the fundus retina image under infrared light, and the shooting state can be entered. The infrared light of the main camera is turned off, and the white light is turned on to collect the fundus retina image.

[0087] In some other alternative embodiments, the steps of adjusting the fundus camera to the second working state include: controlling the driving device to drive the lighting device and the imaging device to move to the second preset position, and switching the imaging parameters of the imaging device to the second imaging parameters for slit lamp photography.

[0088] In the second working state, i.e., the slit lamp mode, the driving device controls the lighting device and the imaging device to move to the preset slit lamp module position to complete the first alignment. Then, the fixation lamp is turned on to guide the user to visually fix on the fixation lamp. The switching gear is toggled to switch to the slit light mode or the diffuse light mode. The slit lamp is turned on for illumination, and the light output direction forms an angle of about 35° with the surface of the eyeball, so that a large light section is formed in the lens and has a suitable reflection angle. The imaging device acquires the eye image at this time and feeds it back to the processor to judge the position of the light band and the eye, and controls the imaging device to perform the second alignment so that the light band formed by the slit light or the diffuse light projected on the surface of the eye is located at the pupil center, and imaging parameters such as the focal length are adjusted for image acquisition.

[0089] In some other alternative embodiments, the steps of adjusting the fundus camera to the third working state include: controlling the driving device to drive the lighting device and the imaging device to move to the third preset position, and switching the imaging parameters of the imaging device to the third imaging parameters for dry eye detection.

[0090] In the third working state, i.e., the dry eye detection mode, the driving device controls the lighting device and the imaging device to move to the preset dry eye detection module position, mainly to adjust the distance between the front surface of the module and the eye to complete the first alignment. The illumination is turned on for the second alignment so that the center of the circular image projected on the surface of the eye by the light passing through the Placido ring is aligned with the pupil center. The lens focal length is adjusted, and the user is prompted to close the eyes by means of voice prompts, etc., and then the user is prompted to open the eyes and keep the eyes open until it is observed that the tear film on the surface of the eye is unevenly ruptured. The whole process is photographed and recorded, and the video clip is transmitted to the cloud for identification by algorithms to detect the tear film break-up time.

[0091] It can be understood that the process of the driving device controlling the movement of the lighting device and the imaging device can be divided into two positioning steps. After the fundus camera switches to the corresponding working state for the first time, the lighting device and the imaging device move to a preset position, which is fixedly set in the fundus camera control system. For the second positioning, after the lighting device is turned on, the emitted light illuminates the eye surface and forms an eye image, and then the imaging device captures the eye image and feeds it back to the processor. The captured eye image is compared with the standard eye image in this working state to determine whether the center of the light spot, the center of the lens of the imaging device, and the center of the pupil are aligned, and the offset value is calculated, and then precise positioning is performed.

[0092] Furthermore, the eye images captured by the imaging device include both static images and dynamic videos. In the dry eye detection mode, the tear film break-up time is a very important detection index, and a complete video from the start of illumination to the break-up of the tear film needs to be recorded. Therefore, the imaging device has both picture and video shooting functions.

[0093] The control method provided by the embodiments of the present invention realizes a multi-module detection and switching method for a portable fundus camera. The switching method between different working states is simple, and with the assistance of computer program algorithms, automatic intelligent control can be achieved, and the captured eye images are analyzed, reducing the usage threshold, and enabling operation without very professional medical knowledge. It not only inherits the advantages of traditional single-function devices, but also effectively combines multiple functions such as fundus retina photography, slit lamp photography, and dry eye detection through technological innovation, thus greatly expanding the application scope and service value of the device. This device is not only suitable for professional medical staff to use in a clinical environment, but also provides the possibility for ordinary consumers to monitor their eye health at home, which has important social significance and technological foresight.

[0094] It should be noted that in this article, the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of another identical element in the process, method, article or device including that element.

[0095] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present invention, those of ordinary skill in the art can also make many forms without departing from the spirit and scope protected by the present invention and the claims, and all of them belong to the protection scope of the present invention.

Claims

1. A fundus camera, characterized in that, Comprising: A functional module, a fuselage, and a lighting device, an imaging device, and a driving device mounted on the fuselage; wherein, The driving device is connected to the lighting device and the imaging device, and is used to control the lighting device and the imaging device to move on the fuselage; The functional module is detachably connected to the fuselage, and the functional module includes at least one of a slit lamp module and a dry eye detection module; The fundus camera has a first working state, a second working state, and a third working state. In the first working state, the fundus camera is used for fundus retina imaging; in the second working state, the slit lamp module is connected to the fuselage, and the fundus camera is used for slit lamp photography; in the third working state, the dry eye detection module is connected to the fuselage, and the fundus camera is used for ocular surface dry eye detection.

2. The fundus camera according to claim 1, wherein The slit lamp module includes a first housing and a slit lamp, a fixation lamp, a diffuser, and a switch gear provided on the first housing. The first housing is detachably connected to the fuselage. There is a through hole on the first housing, and the through hole is opposite to the imaging device. The fixation lamp is arranged on one side of the through hole, and the light emitted by the slit lamp exits from the other side of the through hole; The slit lamp module has a slit light mode and a diffused light mode. The switch gear is respectively connected to the slit lamp and the diffuser, and the switch gear is used to control the slit lamp module to switch between the slit light mode and the diffused light mode; In the slit light mode, the slit lamp emits slit light, and the diffuser is away from the slit light; in the diffused light mode, the slit lamp emits diffused light, and the diffused light passes through the diffuser and exits.

3. The fundus camera according to claim 1, wherein The dry eye detection module includes a second housing. The second housing is detachably connected to the fuselage. A Placido ring is provided on the second housing. The Placido ring is opposite to the lighting device, and the center of the Placido ring is opposite to the imaging device. The thickness of the second housing increases along the direction from the outer ring to the inner ring of the Placido ring, so that the brightness of the light emitted by the lighting device through each ring of the Placido ring is uniform.

4. The fundus camera according to claim 3, wherein, The dry eye detection module further includes a supplementary lighting device, and the supplementary lighting device is arranged opposite to the Placido ring.

5. The fundus camera according to any one of claims 2-4, characterized in that, A first mechanical connector and a first electronic connector are provided on the fuselage, and a second mechanical connector and a second electronic connector are provided at corresponding positions of the functional module. The first mechanical connector and the second mechanical connector are connected to mount the functional module on the imaging device. The first electronic connector is electrically connected to the second electronic connector to detect the type of the functional module, so that the driving device controls the lighting device and the imaging device to move on the fuselage according to the type of the functional module.

6. The fundus camera according to claim 5, characterized in that, The first mechanical connector and the second mechanical connector include at least one of a snap connector and a magnetic connector.

7. The fundus camera according to claim 5, wherein, The first electronic connector and the second electronic connector are contact pins, including: a power supply pin, a type differentiation pin, and a brightness control pin.

8. A method for controlling a fundus camera, characterized in that, including: Obtain the connection information of the functional modules on the fuselage; Adjust the fundus camera to a working state adapted to the connection information of the functional modules. The working state includes at least one of a first working state, a second working state, and a third working state. In the first working state, the fundus camera is used for fundus retina imaging. In the second working state, the fundus camera is used for slit lamp photography. In the third working state, the fundus camera is used for dry eye detection.

9. The control method according to claim 8, wherein The connection information of the functional modules includes: no functional module connected, slit lamp module connected, and dry eye detection module connected; The adjustment of the fundus camera to a working state adapted to the connection information of the functional modules includes: When the connection information of the functional modules is that no functional module is connected, adjust the fundus camera to the first working state; When the connection information of the functional modules is that the slit lamp module is connected, adjust the fundus camera to the second working state; When the connection information of the functional modules is that the dry eye detection module is connected, adjust the fundus camera to the third working state.

10. The method for capturing an eye image according to claim 9, wherein, The step of adjusting the fundus camera to the first working state includes: Control the driving device to drive the lighting device and the imaging device to move to a first preset position, and switch the imaging parameters of the imaging device to first imaging parameters for fundus retina imaging.

11. The method for capturing an eye image according to claim 9, wherein The step of adjusting the fundus camera to the second working state includes: Control the driving device to drive the lighting device and the imaging device to move to a second preset position, and switch the imaging parameters of the imaging device to second imaging parameters for slit lamp photography.

12. The eye image photographing method according to claim 9, characterized in that, The step of adjusting the fundus camera to the third working state includes: Control the driving device to drive the lighting device and the imaging device to move to a third preset position, and switch the imaging parameters of the imaging device to third imaging parameters for dry eye detection.

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