A control system for a slit lamp

Abstract

The application relates to the technical field of medical treatment, in particular to a control system of a slit lamp. The control system is provided with a platform, an observation module, a detection module and a central control module. The data processing unit determines the area vector of each rectangular collection area of the eye to be detected. Whether the irradiation angle needs to be adjusted is determined based on the deviation angle between the area vector and the light irradiation direction vector. The control unit adjusts the irradiation angle of the lighting unit based on the deviation angle. The action parameter of the forehead support is determined based on the pressure value borne by the forehead support, the action parameter of the chin support is determined based on the pressure value borne by the chin support, and the forehead support and the chin support are controlled to move a predetermined distance in the corresponding moving direction. Therefore, the irradiation angle of the slit lamp lighting unit is adaptively adjusted according to the different curvatures of different positions on the eye surface, and the slit lamp lighting unit is adaptively adjusted to the optimal detection position following the change of the head position of the person to be detected during the detection process, so that the adaptability and the detection precision of the control system are improved.

Description

Technical Field

[0001] This invention relates to the field of medical technology, and in particular to a control system for a slit lamp. Background Technology

[0002] A slit lamp is an important instrument for examining the structure of the human eye. It illuminates the area being examined by concentrating a light source, creating a strong contrast with the surrounding darkness. When used in conjunction with a binocular microscope, it allows for clear observation of superficial lesions. Furthermore, the slit can be used to create a narrow light band, which, when shone through the transparent tissues of the eye, forms an optical profile that clearly reveals minute lesions in deeper tissues. Slit lamps are widely used in the detection and diagnosis of cornea, iris, lens, anterior chamber, glaucoma, and cataracts. With the expansion of its applications and scope, slit lamps and their control systems are receiving increasing attention.

[0003] For example, Chinese patent CN115137287A discloses a control system for a slit lamp, including a slit lamp, a moving platform, an identification module, a detection module, an image processing module, and a control module. The control module is connected to the slit lamp, the moving platform, the identification module, the detection module, and the image processing module. The control module performs the following actions: determining the movement direction of the moving platform based on the eye position detected by the identification module; controlling the detection module to detect the data of the eye to be tested and transmitting the data to the image processing module for processing; the control module calculates the image clarity fed back by the processing module and adjusts the light intensity, slit width, and illumination angle of the slit lamp to achieve the preset standard for image clarity.

[0004] The following problems still exist in the existing technology;

[0005] In the existing technology, the illumination angle of the slit lamp illumination unit is not adaptively adjusted according to the different curvatures at different locations on the surface of the eye. Furthermore, the accuracy of the detection is not considered due to slight changes in the position of the subject's head during the detection process, which may cause deviations in the detection and illumination angles. Summary of the Invention

[0006] To overcome the problems in existing technologies where the illumination angle of the slit lamp illumination unit cannot be adaptively adjusted according to the different curvatures at different locations on the eye surface, and where slight changes in the subject's head position during the detection process cause deviations in detection and illumination angles, leading to decreased detection accuracy, this invention provides a slit lamp control system, comprising:

[0007] The platform includes a support for supporting the head and a movable lifting platform disposed on one side of the support and movable in a predetermined direction, the support including a forehead rest and a chin rest;

[0008] The observation module, which is set on the movable lifting platform, includes an illumination unit for providing an adjustable light source and a viewing unit for observing and detecting the object under test.

[0009] The detection module includes a first pressure sensor disposed on the forehead rest for collecting the pressure value of the forehead rest, a second pressure sensor disposed on the chin rest for collecting the pressure value of the chin rest, and an image acquisition unit disposed on the movable lifting platform for collecting eye point cloud data.

[0010] The central control module, which is connected to the platform, observation module and detection module, includes a data processing unit and a control unit. The data processing unit is used to divide the rectangular acquisition area of ​​the eye to be tested based on the eye point cloud data, and determine the area vector of each rectangular acquisition area. Based on the deviation angle between the area vector of the rectangular acquisition area where the illumination unit is located and the light direction vector of the illumination unit, it determines whether the illumination angle of the illumination unit needs to be adjusted.

[0011] The control unit is connected to the data processing unit and is used to adjust the illumination angle of the lighting unit based on the deviation angle when the data processing unit determines that the illumination angle of the lighting unit needs to be adjusted; to determine the action parameters of the forehead support based on the pressure change of the forehead support collected by the first pressure sensor; and to determine the action parameters of the chin support based on the pressure change of the chin support collected by the second pressure sensor. The control unit also controls the forehead support and chin support to move a predetermined distance in the corresponding moving direction.

[0012] The motion parameters of the forehead support include the direction of movement of the forehead support and the distance of movement in the corresponding direction, and the motion parameters of the chin support include the direction of movement of the chin support and the distance of movement in the corresponding direction.

[0013] Furthermore, the data processing unit divides the eye area to be tested into rectangular acquisition regions based on the eye point cloud data, wherein,

[0014] The data processing unit constructs a three-dimensional model of the eye surface based on the eye point cloud data acquired by the image acquisition unit, divides the three-dimensional model of the eye surface into several rectangular regions, and determines the rectangular regions as the rectangular acquisition areas.

[0015] Furthermore, the data processing unit is also used to obtain the three-dimensional coordinates of each vertex of the rectangular acquisition area, and to construct a first plane of the rectangular acquisition area based on the vertices at both ends of the first diagonal and the first vertex on the second diagonal of the rectangular acquisition area.

[0016] The second plane of the rectangular acquisition area is constructed based on the two vertices at both ends of the first diagonal and the second vertex on the second diagonal of the rectangular acquisition area.

[0017] Further, the data processing unit determines the region vector of each of the rectangular acquisition areas, wherein,

[0018] The data processing unit determines the first normal of the first plane of the rectangular acquisition area and the second normal of the second plane of the rectangular acquisition area, and superimposes the first normal and the second normal to determine the region vector of the rectangular acquisition area.

[0019] Furthermore, the data processing unit determines whether the illumination angle of the lighting unit needs to be adjusted based on the deviation angle between the region vector of the rectangular acquisition area where the illumination unit is located and the light illumination direction vector of the lighting unit.

[0020] The deviation angle is compared with a preset deviation angle threshold.

[0021] If the deviation angle is less than or equal to the deviation angle threshold, the data processing unit determines that it is not necessary to adjust the illumination angle of the lighting unit;

[0022] If the deviation angle is greater than the deviation angle threshold, the data processing unit determines that the illumination angle of the lighting unit needs to be adjusted.

[0023] Furthermore, the control unit adjusts the illumination angle of the lighting unit based on the deviation angle, wherein,

[0024] The control unit is pre-configured with several angle adjustment methods that adjust the illumination angle of the lighting unit based on the deviation angle. Each angle adjustment method adjusts the illumination angle of the lighting unit by a different amount.

[0025] Furthermore, the control unit determines the required direction of movement of the forehead rest based on the pressure changes on the forehead rest collected by the first pressure sensor, wherein,

[0026] The control unit calculates the pressure change on the forehead support according to formula (1).

[0027] X = X1 - X0 (1)

[0028] In formula (1), X is the change in pressure on the ballast, X1 is the current value of pressure on the ballast, and X0 is the initial value of pressure on the ballast.

[0029] The pressure change experienced by the forehead brace is compared with preset first and second reference values ​​for forehead brace pressure change.

[0030] If the pressure change on the forehead support is less than the first pressure change reference value of the forehead support, the control unit determines that the direction of movement of the forehead support should be closer to the forehead of the examinee.

[0031] If the pressure change on the forehead support is greater than or equal to the first pressure change reference value of the forehead support, and the pressure change on the forehead support is less than or equal to the second pressure change reference value of the forehead support, then the control unit determines that the forehead support will maintain its current position and will not move.

[0032] If the pressure change on the forehead support is greater than the second pressure change reference value of the forehead support, the control unit determines that the direction of movement of the forehead support should be away from the forehead of the examinee.

[0033] Wherein, the first reference value for the change in forehead pressure is a value less than zero, and the second reference value for the change in forehead pressure is a value greater than zero.

[0034] Furthermore, the control unit determines the required movement distance of the forehead rest based on the pressure changes on the forehead rest collected by the first pressure sensor, wherein,

[0035] The control unit is pre-set with several forehead support movement modes that adjust the movement distance of the forehead support based on the absolute value of the pressure change on the forehead support. Each forehead support movement mode has a different movement distance for the forehead support.

[0036] Furthermore, the control unit determines the required direction of movement of the chin rest based on the pressure changes on the chin rest collected by the second pressure sensor, wherein,

[0037] The control unit calculates the pressure change on the chin rest according to formula (2).

[0038] Y = Y1 - Y0 (2)

[0039] In formula (2), Y is the change in pressure on the chin support, Y1 is the current value of pressure on the chin support, and Y0 is the initial value of pressure on the chin support.

[0040] The pressure change experienced by the chin support is compared with preset first and second pressure change reference values ​​for the chin support.

[0041] If the pressure change on the chin rest is less than the first pressure change reference value of the chin rest, the control unit determines that the required movement direction of the chin rest is the direction of raising the subject's chin.

[0042] If the pressure change on the chin support is greater than or equal to the first pressure change reference value of the chin support, and the pressure value on the chin support is less than or equal to the second pressure change reference value of the chin support, then the control unit determines that the chin support will maintain its current position and will not move.

[0043] If the pressure change on the chin rest is greater than the second pressure change reference value of the chin rest, the control unit determines that the chin rest needs to move in the direction of lowering the subject's chin.

[0044] The first reference value for chin support pressure change is a value less than zero, and the second reference value for chin support pressure change is a value greater than zero.

[0045] Furthermore, the control unit determines the required movement distance of the chin rest based on the pressure changes on the chin rest collected by the second pressure sensor, wherein,

[0046] The control unit is pre-set with several chin support movement modes that adjust the movement distance of the chin support based on the absolute value of the pressure change on the chin support. Each chin support movement mode has a different movement distance for the chin support.

[0047] Compared with the prior art, the beneficial effects of the present invention are as follows: By setting up a platform, observation module, detection module, and central control module, the present invention constructs an eye surface model based on eye point cloud data collected by the image acquisition unit through a data processing unit, divides the eye surface model into rectangular acquisition areas, and determines the area vector of each rectangular acquisition area. Based on the deviation angle between the area vector and the light illumination direction vector of the illumination unit, it determines whether the illumination angle of the illumination unit needs to be adjusted. The control unit adjusts the illumination angle of the illumination unit based on the deviation angle, determines the action parameters of the forehead rest based on the pressure value collected by the first pressure sensor, and determines the action parameters of the chin rest based on the pressure value collected by the second pressure sensor. It also controls the forehead rest and chin rest to move a predetermined distance in the corresponding movement direction. Thus, it realizes the adaptive adjustment of the illumination angle of the slit lamp illumination unit according to the different curvatures at different positions of the eye surface, and adaptively adjusts to the optimal detection position according to the changes in the subject's head position during the detection process, thereby improving the adaptability and detection accuracy of the control system.

[0048] In particular, the present invention divides the subject's eye into several rectangular acquisition areas through a data processing unit. In reality, the curvature parameters of different subjects' eyes are different, and the curvature parameters of different areas of the same subject's eye are also different. The present invention divides the subject's eye into several rectangular acquisition areas, which facilitates the adaptive adjustment of the slit lamp control system based on the curvature parameters of the eyes in different areas, thereby improving the adaptability of the control system and the detection accuracy.

[0049] In particular, this invention determines the region vector of the rectangular acquisition area through a data processing unit. In practice, since the surface of the eye is curved, it is impossible to accurately determine the region vector of each curved rectangular acquisition area. The four vertices of the rectangular acquisition area are divided into two groups. Based on the principle that three points form a surface, two planes are found within the rectangular acquisition area. The normals of the two planes are superimposed to determine the region normal of the curved surface of the rectangular acquisition area. This makes the determined region normal more accurate and convenient. As a result, the region normal acquired by the slit lamp control system is more representative, improving the detection accuracy of the control system.

[0050] In particular, this invention determines the deviation angle between the region vector of the rectangular acquisition area and the light illumination direction vector through a data processing unit. Based on the comparison between the deviation angle and a preset deviation angle threshold, it determines whether the illumination angle of the illumination unit needs to be adjusted. In practice, the smaller the deviation angle between the illumination direction of the illumination unit and the region vector of the eye, the greater the light intensity acquired by the eye area to be examined, resulting in a clearer and easier-to-observe image. However, the impact of the deviation angle on detection accuracy is limited within a certain range. Therefore, it is not necessary to adjust the illumination angle of the illumination unit whenever a deviation exists. When the deviation angle is greater than the preset deviation angle threshold, the excessively large deviation angle value will affect the illumination effect of the illumination unit, thereby affecting the detection accuracy. In this case, the illumination angle of the illumination unit needs to be adjusted. Thus, the illumination angle can be adaptively adjusted for different regions of the subject's eye, improving the detection accuracy of the control system.

[0051] In particular, this invention acquires the pressure values ​​of the first and second pressure sensors through a control unit, and adjusts the motion parameters of the forehead and chin supports accordingly based on changes in pressure. In practice, the subject's head inevitably moves slightly during the testing process, causing deviations between the previously set illumination angle and the position of the detection unit and the optimal position. By comparing the changes in pressure received by the sensors on the forehead and chin of the support, the direction and degree of change in the subject's head movement can be determined, and the mobile lifting platform can be adjusted accordingly. This reduces the impact of changes in the subject's head position on the detection module on the mobile lifting platform. By collecting the pressure of the forehead and chin supports in real time and adjusting the movement direction and distance of the forehead and chin supports based on pressure changes, this invention enables the forehead and chin supports to follow the subject's head position, improving the adaptability of the control system. Attached Figure Description

[0052] Figure 1 This is a structural block diagram of the control system for the slit lamp according to an embodiment of the present invention;

[0053] Figure 2 This is a structural block diagram of the central control module according to an embodiment of the present invention;

[0054] Figure 3 This is a schematic diagram of the rectangular acquisition area according to an embodiment of the present invention;

[0055] In the diagram, 1 represents the first diagonal and 2 represents the second diagonal. Detailed Implementation

[0056] To make the objectives and advantages of the present invention clearer, the present invention will be further described below with reference to embodiments; it should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention.

[0057] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0058] It should be noted that in the description of this invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc., which indicate directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and is not intended to indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0059] Furthermore, it should be noted that, in the description of this 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 this invention according to the specific circumstances.

[0060] Please see Figure 1 as well as Figure 2 As shown, Figure 1 This is a structural block diagram of the control system for a slit lamp according to an embodiment of the present invention. Figure 2 This is a structural block diagram of the central control module according to an embodiment of the present invention. The control system of the slit lamp of the present invention includes:

[0061] The platform includes a support for supporting the head and a movable lifting platform disposed on one side of the support and movable in a predetermined direction, the support including a forehead rest and a chin rest;

[0062] The observation module, which is set on the movable lifting platform, includes an illumination unit for providing an adjustable light source and a viewing unit for observing and detecting the object under test.

[0063] The detection module includes a first pressure sensor disposed on the forehead rest for collecting the pressure value of the forehead rest, a second pressure sensor disposed on the chin rest for collecting the pressure value of the chin rest, and an image acquisition unit disposed on the movable lifting platform for collecting eye point cloud data.

[0064] The central control module, which is connected to the platform, observation module and detection module, includes a data processing unit and a control unit. The data processing unit is used to divide the rectangular acquisition area of ​​the eye to be tested based on the eye point cloud data, and determine the area vector of each rectangular acquisition area. Based on the deviation angle between the area vector of the rectangular acquisition area where the illumination unit is located and the light direction vector of the illumination unit, it determines whether the illumination angle of the illumination unit needs to be adjusted.

[0065] The control unit is connected to the data processing unit and is used to adjust the illumination angle of the lighting unit based on the deviation angle when the data processing unit determines that the illumination angle of the lighting unit needs to be adjusted; to determine the action parameters of the forehead support based on the pressure change of the forehead support collected by the first pressure sensor; and to determine the action parameters of the chin support based on the pressure change of the chin support collected by the second pressure sensor. The control unit also controls the forehead support and chin support to move a predetermined distance in the corresponding moving direction.

[0066] The motion parameters of the forehead support include the direction of movement of the forehead support and the distance of movement in the corresponding direction, and the motion parameters of the chin support include the direction of movement of the chin support and the distance of movement in the corresponding direction.

[0067] Specifically, the present invention does not limit the specific arrangement of the first pressure sensor and the second pressure sensor, as long as they can accurately collect real-time pressure data on the forehead and chin of the subject during the detection process. This technology is well known to those skilled in the art and will not be described in detail here.

[0068] Specifically, this invention does not limit the specific structure of the central control module and its internal functional units. It can be a functional program in a computer or a micro control computer, as long as it can perform calculation and analysis on the corresponding data and images and control the relevant units. This is existing technology and will not be elaborated here.

[0069] Specifically, please refer to Figure 3As shown, this is a schematic diagram of the rectangular acquisition area in an embodiment of the present invention. The data processing unit divides the rectangular acquisition area of ​​the eye to be tested based on the eye point cloud data, wherein...

[0070] The data processing unit constructs a three-dimensional model of the eye surface based on the eye point cloud data acquired by the image acquisition unit, divides the three-dimensional model of the eye surface into several rectangular regions, and determines the rectangular regions as the rectangular acquisition areas.

[0071] Specifically, the present invention divides the subject's eye into several rectangular acquisition areas through a data processing unit. In reality, the curvature parameters of different subjects' eyes are different, and the curvature parameters of different areas of the same subject's eye are also different. The present invention divides the subject's eye into several rectangular acquisition areas, which facilitates the adaptive adjustment of the slit lamp control system based on the curvature parameters of the eyes in different areas, thereby improving the adaptability of the control system and the detection accuracy.

[0072] Specifically, the data processing unit is also used to obtain the three-dimensional coordinates of each vertex of the rectangular acquisition area, and to construct a first plane of the rectangular acquisition area based on the vertices a and c at both ends of the first diagonal 1 and the first vertex b on the second diagonal 2 of the rectangular acquisition area.

[0073] The second plane of the rectangular acquisition area is constructed based on vertices a and c at both ends of the first diagonal 1 and the second vertex d on the second diagonal 2.

[0074] Specifically, the data processing unit determines the region vector of each of the rectangular acquisition areas, wherein,

[0075] The data processing unit determines the first normal of the first plane of the rectangular acquisition area and the second normal of the second plane of the rectangular acquisition area, and superimposes the first normal and the second normal to determine the region vector of the rectangular acquisition area.

[0076] Specifically, this invention determines the region vector of a rectangular acquisition area through a data processing unit. In practice, since the surface of the eye is curved, it is impossible to accurately determine the region vector of each curved rectangular acquisition area. The four vertices of the rectangular acquisition area are divided into two groups. Based on the principle that three points form a surface, two planes are found within the rectangular acquisition area. The normals of the two planes are superimposed to determine the region normal of the curved surface of the rectangular acquisition area. This makes the determined region normal more accurate and convenient. As a result, the region normal acquired by the slit lamp control system is more representative, improving the detection accuracy of the control system.

[0077] Specifically, the data processing unit determines whether the illumination angle of the lighting unit needs to be adjusted based on the deviation angle between the region vector of the rectangular acquisition area where the illumination unit is located and the light illumination direction vector of the lighting unit.

[0078] The deviation angle α is compared with a preset deviation angle threshold α0.

[0079] If the deviation angle α is less than or equal to the deviation angle threshold α0, the data processing unit determines that it is not necessary to adjust the illumination angle of the lighting unit;

[0080] If the deviation angle α is greater than the deviation angle threshold α0, the data processing unit determines that the illumination angle of the lighting unit needs to be adjusted.

[0081] Preferably, in this embodiment of the invention, the deviation angle threshold α0 is ≥ 10°.

[0082] Specifically, this invention determines the deviation angle α between the region vector of the rectangular acquisition area and the light illumination direction vector through a data processing unit. Based on the comparison between the deviation angle α and a preset deviation angle threshold α0, it determines whether the illumination angle of the illumination unit needs to be adjusted. In practice, the smaller the deviation angle α between the illumination direction of the illumination unit and the region vector of the eye, the greater the light intensity acquired by the eye region to be examined, resulting in a clearer and easier-to-observe image. However, the impact of the deviation angle on detection accuracy is limited within a certain range. Therefore, it is not necessary to adjust the illumination angle of the illumination unit whenever a deviation exists. When the deviation angle α is greater than the preset deviation angle threshold α0, the excessively large deviation angle value will affect the illumination effect of the illumination unit, thereby affecting the detection accuracy. In this case, the illumination angle of the illumination unit needs to be adjusted. Thus, the illumination angle can be adaptively adjusted for different regions of the subject's eye, improving the detection accuracy of the control system.

[0083] Specifically, the control unit adjusts the illumination angle of the lighting unit based on the deviation angle, wherein,

[0084] The control unit is pre-configured with several angle adjustment methods that adjust the illumination angle of the lighting unit based on the deviation angle. Each angle adjustment method adjusts the illumination angle of the lighting unit by a different amount.

[0085] Specifically, in this embodiment, at least two angle adjustment methods are set to adjust the illumination angle of the lighting unit based on the deviation angle α, wherein the deviation angle α is compared with a preset deviation angle comparison value α. a Compare;

[0086] If α < αa Then, the control unit determines that the angle adjustment method for adjusting the illumination angle of the lighting unit is the first angle adjustment method. The first angle adjustment method is to adjust the deviation angle between the light illumination direction of the lighting unit and the area vector to a first deviation angle α1, and set α1 = α μ -Δα1;

[0087] If α≥α a Then, the control unit determines that the angle adjustment method for adjusting the illumination angle of the lighting unit is the second angle adjustment method. The second angle adjustment method is to adjust the deviation angle between the light illumination direction of the lighting unit and the area vector to a second deviation angle α2, and set α2 = α μ -Δα2;

[0088] Where, α μ This represents the current deviation angle between the light illumination direction of the lighting unit and the area vector. Δα1 represents the first deviation angle adjustment amount, and Δα2 represents the second deviation angle adjustment amount. In this embodiment, to make the deviation angle comparison value α... a It is able to distinguish the degree of deviation between the light illumination direction of the illumination unit and the area vector, so that 10° < α a <15°. Similarly, to ensure the adjustment is effective and to avoid excessive adjustment, in this embodiment, 5°≤Δα1<Δα2<80°.

[0089] Specifically, the control unit determines the required direction of movement of the forehead rest based on the pressure changes on the forehead rest collected by the first pressure sensor, wherein...

[0090] The control unit calculates the pressure change on the forehead support according to formula (1).

[0091] X = X1 - X0 (1)

[0092] In formula (1), X is the change in pressure on the ballast, X1 is the current value of pressure on the ballast, and X0 is the initial value of pressure on the ballast.

[0093] The pressure change X of the forehead brace is compared with the preset first pressure change reference value Xa and the second pressure change reference value Xb of the forehead brace.

[0094] If the pressure change X of the forehead support is less than the first pressure change reference amount Xa of the forehead support, then the control unit determines that the direction of movement of the forehead support should be closer to the forehead of the examinee.

[0095] If the pressure change Xa on the forehead support is greater than or equal to the first pressure change reference Xa on the forehead support, and the pressure change X on the forehead support is less than or equal to the second pressure change reference Xb on the forehead support, then the control unit determines that the forehead support will maintain its current position and will not move.

[0096] If the pressure change X of the forehead support is greater than the second pressure change reference value Xb of the forehead support, then the control unit determines that the direction of movement of the forehead support should be away from the forehead of the examinee.

[0097] Wherein, the first reference value for the change in forehead pressure Xa is a value less than zero, and the second reference value for the change in forehead pressure Xb is a value greater than zero. Preferably, in this embodiment, -5N≤Xa≤-2N, 2N<Xb≤5N, and |Xa|=|Xb|.

[0098] Specifically, the control unit determines the required movement distance of the forehead rest based on the pressure changes on the forehead rest collected by the first pressure sensor, wherein...

[0099] The control unit is pre-set with several forehead support movement modes that adjust the movement distance of the forehead support based on the absolute value |X| of the pressure change on the forehead support. Each forehead support movement mode has a different movement distance for the forehead support.

[0100] Preferably, in this embodiment of the invention, at least two forehead pad movement methods are set to adjust the movement distance of the forehead pad based on the absolute value |X| of the pressure change on the forehead pad, wherein the absolute value |X| of the pressure change on the forehead pad is compared with a preset third pressure change reference amount Xc of the forehead pad.

[0101] If |X|≤Xc, then the control unit determines the forehead rest movement mode for adjusting the movement distance of the forehead rest as the first forehead rest movement mode, and the first forehead rest movement mode is to determine the movement distance of the forehead rest as the first forehead rest movement distance S1;

[0102] If |X|>Xc, then the control unit determines the forehead support movement mode for adjusting the movement distance of the forehead support as the second forehead support movement mode, and the second forehead support movement mode is to determine the movement distance of the forehead support as the second forehead support movement distance S2;

[0103] In this embodiment, in order for the third pressure change reference value Xc of the forehead support to be able to distinguish the degree of pressure change of the forehead support, 2N≤Xc≤7N can be made. Similarly, in order to make the adjustment effective and avoid the adjustment amount being too large, in this embodiment, 0.5cm≤S1<S2≤2cm.

[0104] Specifically, the control unit determines the required direction of movement of the chin rest based on the pressure changes on the chin rest collected by the second pressure sensor, wherein...

[0105] The control unit calculates the pressure change on the chin rest according to formula (2).

[0106] Y = Y1 - Y0 (2)

[0107] In formula (2), Y is the change in pressure on the chin support, Y1 is the current value of pressure on the chin support, and Y0 is the initial value of pressure on the chin support.

[0108] The pressure change Y of the chin rest is compared with the preset first pressure change reference amount Ya and the second pressure change reference amount Yb of the chin rest.

[0109] If the pressure change Y of the chin rest is less than the first pressure change reference amount Ya of the chin rest, then the control unit determines that the required movement direction of the chin rest is the direction of raising the subject's chin.

[0110] If the pressure change Y of the chin support is greater than or equal to the first pressure change reference amount Ya of the chin support, and the pressure value Y of the chin support is less than or equal to the second pressure change reference amount Yb of the chin support, then the control unit determines that the chin support will maintain its current position and will not move.

[0111] If the pressure change Y of the chin rest is greater than the second pressure change reference value Yb of the chin rest, then the control unit determines that the required movement direction of the chin rest is the direction of lowering the subject's chin.

[0112] Wherein, the first pressure change reference value Ya of the chin support is a value less than zero, and the second pressure change reference value Yb of the chin support is a value greater than zero. Preferably, in this embodiment, -10N≤Ya≤-5N, 5N<Yb≤10N, and |Ya|=|Yb|.

[0113] Specifically, the control unit determines the required movement distance of the chin rest based on the pressure changes on the chin rest collected by the second pressure sensor, wherein...

[0114] The control unit is pre-set with several chin support movement modes that adjust the movement distance of the chin support based on the absolute value |Y| of the pressure change on the chin support. Each chin support movement mode has a different movement distance for the chin support.

[0115] Preferably, in this embodiment of the invention, at least two chin support movement methods are set to adjust the movement distance of the chin support based on the absolute value |Y| of the pressure change on the chin support, wherein the absolute value |Y| of the pressure change on the chin support is compared with a preset third pressure change reference amount Yc of the chin support.

[0116] If |Y|≤Yc, then the control unit determines the chin support movement mode for adjusting the movement distance of the chin support as the first chin support movement mode, and the first chin support movement mode is to determine the movement distance of the chin support as the first chin support movement distance L1;

[0117] If |Y|>Yc, then the control unit determines that the chin support movement mode for adjusting the movement distance of the chin support is the second chin support movement mode, and the second chin support movement mode is to determine that the movement distance of the chin support is the second chin support movement distance L2;

[0118] In this embodiment, in order for the third pressure change reference value Yc of the chin support to be able to distinguish the degree of pressure change of the chin support, it can be 5N≤Yc≤12N. Similarly, in order to make the adjustment effective and avoid the adjustment amount being too large, in this embodiment, 0.5cm≤L1<L2≤2cm.

[0119] Specifically, this invention acquires the pressure values ​​of the first and second pressure sensors through a control unit, and adjusts the motion parameters of the forehead and chin supports accordingly based on changes in pressure. In practice, the subject's head inevitably moves slightly during the testing process, causing deviations between the previously set illumination angle and the optimal position of the detection unit. By comparing the changes in pressure received by the sensors on the forehead and chin of the support, the direction and degree of change in the subject's head movement can be determined, and the mobile lifting platform can be adjusted accordingly. This reduces the impact of changes in the subject's head position on the detection module on the mobile lifting platform. By collecting the pressure of the forehead and chin supports in real time and adjusting the movement direction and distance of the forehead and chin supports based on pressure changes, this invention enables the forehead and chin supports to follow the subject's head position, improving the adaptability of the control system.

[0120] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of the present invention.

[0121] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A control system for a slit lamp, characterized in that, include: The platform includes a support for supporting the head and a movable lifting platform disposed on one side of the support and movable in a predetermined direction, the support including a forehead rest and a chin rest; The observation module, which is set on the movable lifting platform, includes an illumination unit for providing an adjustable light source and a viewing unit for observing and detecting the object under test. The detection module includes a first pressure sensor disposed on the forehead rest for collecting the pressure value of the forehead rest, a second pressure sensor disposed on the chin rest for collecting the pressure value of the chin rest, and an image acquisition unit disposed on the movable lifting platform for collecting eye point cloud data. The central control module, which is connected to the platform, observation module and detection module, includes a data processing unit and a control unit. The data processing unit is used to divide the rectangular acquisition area of ​​the eye to be tested based on the eye point cloud data, and determine the area vector of each rectangular acquisition area. Based on the deviation angle between the area vector of the rectangular acquisition area where the illumination unit is located and the light direction vector of the illumination unit, it determines whether the illumination angle of the illumination unit needs to be adjusted. The data processing unit divides the eye into rectangular acquisition areas based on the eye point cloud data. The data processing unit constructs a three-dimensional model of the eye surface based on the eye point cloud data acquired by the image acquisition unit, divides the three-dimensional model of the eye surface into several rectangular areas, and determines the rectangular areas as the rectangular acquisition areas. The data processing unit is also used to obtain the three-dimensional coordinates of each vertex of the rectangular acquisition area, and to construct a first plane of the rectangular acquisition area based on the vertices at both ends of the first diagonal and the first vertex on the second diagonal of the rectangular acquisition area. A second plane of the rectangular acquisition area is constructed based on the two vertices at both ends of the first diagonal and the second vertex on the second diagonal of the rectangular acquisition area; The data processing unit determines the region vector of each of the rectangular acquisition areas, wherein the data processing unit determines the first normal of the first plane of the rectangular acquisition area and the second normal of the second plane of the rectangular acquisition area, and superimposes the first normal and the second normal to determine the region vector of the rectangular acquisition area; The data processing unit determines whether the illumination angle of the lighting unit needs to be adjusted based on the deviation angle between the region vector of the rectangular acquisition area where the illumination unit is located and the light direction vector of the illumination unit. The deviation angle is compared with a preset deviation angle threshold. If the deviation angle is less than or equal to the deviation angle threshold, the data processing unit determines that the illumination angle of the lighting unit does not need to be adjusted. If the deviation angle is greater than the deviation angle threshold, the data processing unit determines that the illumination angle of the lighting unit needs to be adjusted. The control unit is connected to the data processing unit and is used to adjust the illumination angle of the lighting unit based on the deviation angle when the data processing unit determines that the illumination angle of the lighting unit needs to be adjusted; to determine the action parameters of the forehead support based on the pressure change of the forehead support collected by the first pressure sensor; and to determine the action parameters of the chin support based on the pressure change of the chin support collected by the second pressure sensor. The control unit also controls the forehead support and chin support to move a predetermined distance in the corresponding moving direction. The motion parameters of the forehead support include the direction of movement of the forehead support and the distance of movement in the corresponding direction, and the motion parameters of the chin support include the direction of movement of the chin support and the distance of movement in the corresponding direction.

2. The control system for the slit lamp according to claim 1, characterized in that, The control unit adjusts the illumination angle of the lighting unit based on the deviation angle, wherein, The control unit is pre-configured with several angle adjustment methods that adjust the illumination angle of the lighting unit based on the deviation angle. Each angle adjustment method adjusts the illumination angle of the lighting unit by a different amount.

3. The control system for the slit lamp according to claim 2, characterized in that, The control unit determines the required direction of movement of the forehead rest based on the pressure changes on the forehead rest collected by the first pressure sensor, wherein... The control unit calculates the pressure change on the forehead support according to formula (1). X = X1 - X0 (1) In formula (1), X is the change in pressure on the ballast, X1 is the current value of pressure on the ballast, and X0 is the initial value of pressure on the ballast. The pressure change experienced by the forehead brace is compared with preset first and second reference values ​​for forehead brace pressure change. If the pressure change on the forehead support is less than the first pressure change reference value of the forehead support, the control unit determines that the direction of movement of the forehead support should be closer to the forehead of the examinee. If the pressure change on the forehead support is greater than or equal to the first pressure change reference value of the forehead support, and the pressure change on the forehead support is less than or equal to the second pressure change reference value of the forehead support, then the control unit determines that the forehead support will maintain its current position and will not move. If the pressure change on the forehead support is greater than the second pressure change reference value of the forehead support, the control unit determines that the direction of movement of the forehead support should be away from the forehead of the examinee. Wherein, the first reference value for the change in forehead pressure is a value less than zero, and the second reference value for the change in forehead pressure is a value greater than zero.

4. The control system for the slit lamp according to claim 3, characterized in that, The control unit determines the required movement distance of the forehead rest based on the pressure changes on the forehead rest collected by the first pressure sensor, wherein... The control unit is pre-set with several forehead support movement modes that adjust the movement distance of the forehead support based on the absolute value of the pressure change on the forehead support. Each forehead support movement mode has a different movement distance for the forehead support.

5. The control system for the slit lamp according to claim 4, characterized in that, The control unit determines the required direction of movement of the chin rest based on the pressure changes on the chin rest collected by the second pressure sensor, wherein... The control unit calculates the pressure change on the chin rest according to formula (2). Y = Y1 - Y0 (2) In formula (2), Y is the change in pressure on the chin support, Y1 is the current value of pressure on the chin support, and Y0 is the initial value of pressure on the chin support; The pressure change experienced by the chin support is compared with preset first and second pressure change reference values ​​for the chin support. If the pressure change on the chin rest is less than the first pressure change reference value of the chin rest, the control unit determines that the required movement direction of the chin rest is the direction of raising the subject's chin. If the pressure change on the chin support is greater than or equal to the first pressure change reference value of the chin support, and the pressure value on the chin support is less than or equal to the second pressure change reference value of the chin support, then the control unit determines that the chin support will maintain its current position and will not move. If the pressure change on the chin rest is greater than the second pressure change reference value of the chin rest, the control unit determines that the chin rest needs to move in the direction of lowering the subject's chin. The first reference value for chin support pressure change is a value less than zero, and the second reference value for chin support pressure change is a value greater than zero.

6. The control system for the slit lamp according to claim 5, characterized in that, The control unit determines the required movement distance of the chin rest based on the pressure changes on the chin rest collected by the second pressure sensor, wherein... The control unit is pre-set with several chin support movement modes that adjust the movement distance of the chin support based on the absolute value of the pressure change on the chin support. Each chin support movement mode has a different movement distance for the chin support.

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