Light source plate, optometry system and vision screening instrument

Abstract

The utility model relates to a light source plate, an optometry system and a vision screening instrument. The light source plate comprises an LED array used for providing illumination in the vision screening process; the luminous intensity acquisition circuit is connected to the control circuit and is used for acquiring an illumination intensity signal of the LED array and sending the illumination intensity signal to the control circuit; the control circuit is connected to the LED array and is used for adjusting the illumination intensity of the LED array according to the illumination intensity signal; and the buzzer alarm circuit is connected to the luminous intensity acquisition circuit and is used for giving an alarm when the voltage of the illumination intensity signal is greater than a voltage threshold value. When the light source plate is used for vision screening, the accuracy of vision screening results can be guaranteed, and eyes of a patient are prevented from being stimulated.

Description

TECHNICAL FIELD

[0001] The utility model relates to LED light source technical field generally. More specifically, the utility model relates to a light source board, optometry system and visual screening instrument. BACKGROUND

[0002] Visual screening instrument, also known as refractive screening instrument, is a kind of medical equipment for detecting visual problems, with the advantages of objectivity, accuracy, rapidity etc., especially suitable for early detection of children's amblyopia.Visual screening instrument can carry out binocular or monocular measurement, including the screening of parameters such as spherical power, cylindrical power, axis angle, pupil size, interpupillary distance, fixation direction, and record abnormal light reflection. It can be used to detect myopia, hyperopia, astigmatism, strabismus, unequal pupil size, refractive disparity, asymmetric fixation, etc.

[0003] Visual screening instrument usually includes optometry system, and the optometry system includes infrared camera, infrared lens, optical filter and light source board. The light-emitting brightness of the lamp panel of the existing visual screening instrument is fixed, i.e. the lamp panel can only emit light with fixed brightness. However, in different detection environments, the light brightness of the external environment is different. For example, the light brightness in outdoor in daytime is greater than that in indoor. In the case of high ambient light intensity, the lamp panel with low light-emitting brightness cannot provide sufficient light source, and the gray-scale image of the pupil captured at this time will have a great influence, and normal refractive detection cannot be carried out, resulting in low accuracy of visual screening result. While in the case of low ambient light intensity, the lamp panel with high light-emitting brightness will cause great stimulation to the eyes of the person being tested, causing discomfort. CONTENT OF THE UTILITY MODEL

[0004] To solve the technical problems of low accuracy of visual screening result and great stimulation to the eyes of the person being tested of the existing visual screening instrument, the utility model provides solutions in the following aspects.

[0005] In the first aspect, the utility model provides a light source board, comprising:

[0006] LED array, for providing illumination in the visual screening process;

[0007] Light intensity acquisition circuit connected to the control circuit, for acquiring the light intensity signal of the LED array and sending it to the control circuit;

[0008] Control circuit connected to the LED array, for adjusting the light intensity of the LED array according to the light intensity signal;

[0009] Buzzer alarm circuit connected to the light intensity acquisition circuit, for alarming when the voltage of the light intensity signal is greater than the voltage threshold.

[0010] Further, the light-emitting intensity acquisition circuit comprises a photodiode arranged at the light-emitting diode position of the LED array, an anode of the photodiode being grounded, a cathode of the photodiode being connected to an ADC pin of the control circuit, and the photodiode being supplied with voltage through a first pull-up resistor.

[0011] Further, the buzzer alarm circuit comprises a voltage dividing branch, a comparator, a control switch, and a buzzer, one end of the buzzer being connected to a supply voltage, the other end of the buzzer being connected to ground through the control switch, a controlled end of the control switch being connected to an output end of the comparator, one input end of the comparator being connected to a voltage dividing point of the voltage dividing branch, the other input end of the comparator being connected to the cathode of the photodiode, and the voltage dividing branch being connected between the supply voltage and ground.

[0012] Further, the control switch is a triode, a base of the triode being connected to the output end of the comparator through a current-limiting resistor, and a first resistor being connected in series between the base and an emitter of the triode.

[0013] Further, the control circuit comprises a single-chip microcomputer and an LED driving chip connected to each other, an ADC pin of the single-chip microcomputer being connected to the cathode of the photodiode, a switch pin of the LED driving chip being connected to an anode of the light-emitting diode of the LED array, and a cathode of the light-emitting diode of the LED array being connected to a current sampling pin of the LED driving chip through a sampling resistor.

[0014] Further, a reset pin of the single-chip microcomputer is connected to a reset circuit, the reset circuit comprising a reset switch and a capacitor connected in parallel across the reset switch, one end of the capacitor being connected to the reset pin and connected to a supply voltage through a second pull-up resistor, and the other end of the capacitor being grounded.

[0015] Further, the LED array comprises an infrared LED array and a visible light LED array, the infrared LED array comprising a plurality of infrared LED sub-arrays and one infrared light-emitting diode located at the center of the substrate of the light source board, the visible light LED array comprising a plurality of visible light LED sub-arrays, the infrared light-emitting diodes in the infrared LED sub-arrays being distributed in a ring shape with the center of the substrate of the light source board as the center, the visible light LED sub-arrays of the visible light LED array being distributed in a ring shape with the center of the substrate of the light source board as the center, and the distance between adjacent infrared LED sub-arrays being equal and the distance between adjacent visible light LED sub-arrays being equal.

[0016] In a second aspect, the utility model provides a refraction system, including infrared camera, infrared lens, optical filter and light source board, the light source board is the light source board of the utility model.

[0017] In a third aspect, the utility model provides a visual screening instrument, including:

[0018] Wireless communication module, for communication between visual screening instrument and other equipment;

[0019] Optometry system, adopt the optometry system of the utility model, for detecting eyeball each parameter;

[0020] Man -machine interface module, for setting visual screening instrument each parameter;

[0021] Printing module, for printing visual screening report;

[0022] Integrated control system, be connected to wireless communication module, optometry system, man -machine interface module and printing module, for the work of control of visual screening instrument;

[0023] Power module, for the circuit power supply of visual screening instrument.

[0024] The utility model discloses the beneficial effect is: adopt the light source board of the utility model can realize the luminous intensity of light source board automatic regulation, thereby realizes in the case of ambient illuminance, improves the illumination intensity of light source board, makes light source board provide enough light source, thereby guaranteeing the precision of visual screening result, in the case of ambient illuminance, reduces the illumination intensity of light source board, avoids the irritation and discomfort of the eye of patient, through setting buzzer alarm circuit, so that remind the user when the luminous intensity of light source board is too big, help to avoid the irritation of the eye of user. BRIEF DESCRIPTION OF DRAWINGS

[0025] The above and other objects, features and advantages of the exemplary embodiments of the utility model will be readily understood through the detailed description in the following, by reading the accompanying drawings. In the drawings, several embodiments of the utility model are shown in an exemplary but not restrictive manner, and the same or corresponding reference numbers indicate the same or corresponding parts, wherein:

[0026] Figure 1 It is the circuit structure schematic drawing of the light source board of the embodiment of the utility model;

[0027] Figure 2 It is the principle diagram of luminous intensity acquisition circuit and buzzer alarm circuit of the embodiment of the utility model;

[0028] Figure 3 It is the single-chip microcomputer circuit principle diagram of the embodiment of the utility model;

[0029] Figure 4 It is the LED drive chip circuit principle diagram of the embodiment of the utility model;

[0030] Figure 5 is a schematic diagram of the LED array distribution mode of the light source plate of the embodiment of the present application;

[0031] Figure 6 is a schematic diagram of the connection relationship between the infrared LED array and the LED driving chip of the embodiment of the present application;

[0032] Figure 7 is a schematic diagram of the optometry system structure of the embodiment of the present application;

[0033] Figure 8 is a schematic diagram of the vision screening instrument structure of the embodiment of the present application. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0035] The specific implementation manners of the present application will be described in detail below with reference to the drawings.

[0036] Light source plate embodiment:

[0037] As shown in Figure 1 The light source plate of the present application comprises: an LED array, which is used to provide illumination in the vision screening process; a light intensity acquisition circuit, which is connected to a control circuit, and is used to acquire the light intensity signal of the LED array and send it to the control circuit; a control circuit, which is connected to the LED array, and is used to adjust the light intensity of the LED array according to the light intensity signal; and a buzzer alarm circuit, which is connected to the light intensity acquisition circuit, and is used to alarm when the voltage of the light intensity signal is greater than the voltage threshold.

[0038] In the working process of the light source plate, the light intensity acquisition circuit acquires the light intensity signal of the LED array in real time and sends it to the control circuit. The control circuit can judge whether the light intensity meets the requirements according to the preset light intensity range. When the light intensity is too low, the light intensity of the LED array can be increased, and when the light intensity is too high, the light intensity of the LED array can be decreased, so that the light intensity of the LED array is kept in a proper range.

[0039] The light source board of the utility model can automatically adjust the luminous intensity of the light source board, thereby improving the light intensity of the light source board in the case of high ambient light intensity, providing sufficient light source for the light source board, and ensuring the accuracy of the visual screening result; in the case of low ambient light intensity, the light intensity of the light source board is reduced, thereby avoiding stimulating and discomforting the eyes of the patient; the buzzer alarm circuit is arranged, so as to remind the user when the luminous intensity of the light source board is too high, and the eyes of the user can be stimulated.

[0040] As shown in the figure, Figure 2 In one embodiment, the luminous intensity acquisition circuit comprises a photodiode LED 20 arranged at the light-emitting diode position of the LED array, the anode of the photodiode is grounded GND, the cathode is connected to the ADC pin of the control circuit, and the power supply voltage VCC is connected through the first pull-up resistor R20.

[0041] During the working process of the light source board, with the change of the luminous intensity of the LED array, the resistance of the photodiode will change, and the potential of the cathode will also change, therefore, by acquiring the potential of the cathode, the luminous intensity of the LED array can be detected.

[0042] In one embodiment, the buzzer alarm circuit comprises a voltage division branch, a comparator U3, a control switch Q3 and a buzzer BEEP, one end of the buzzer is connected to the power supply voltage, the other end is grounded through the control switch Q3, the controlled end of the control switch is connected to the output end of the comparator, one input end of the comparator is connected to the voltage division point of the voltage division branch, the other input end of the comparator is connected to the cathode of the photodiode, and the voltage division branch is connected between the power supply voltage VCC and the ground GND.

[0043] During the working process of the light source board, the comparator U3 acquires the cathode potential of the photodiode and the voltage division point potential of the voltage division branch in real time and compares them, when the cathode potential of the photodiode is higher than the voltage division point potential, the comparator U3 outputs current, the control switch Q3 is turned on, and the buzzer BEEP is connected to the power supply to start alarming.

[0044] In the embodiment, the comparator U3 adopts an inverting comparator, wherein the non-inverting input end 5 of the comparator is connected to the voltage division point of the voltage division branch, and the inverting input end 6 is connected to the cathode of the photodiode. In other embodiments, the comparator U3 can also adopt a non-inverting comparator.

[0045] In the embodiment, the voltage division branch comprises a first voltage division resistor R21 and a second voltage division resistor R22 connected in series, and in other embodiments, the voltage division branch can also be other suitable circuits.

[0046] In one embodiment, the control switch Q3 is a triode, the base of the triode is connected to the output of the comparator through a current limiting resistor R23, and a first resistor R24 is connected in series between the base and the emitter of the triode.

[0047] By setting the current limiting resistor R23, the triode can be protected from excessive current and burned out. In high-frequency circuits or high-speed switching circuits, parasitic capacitance and inductance may cause instability or self-oscillation. The resistance between the base and the emitter can increase the damping of the circuit, reduce the high-frequency gain, suppress oscillation, and improve the stability and frequency response of the circuit, so that the circuit is not easily self-excited at high frequencies. Since the base of the triode cannot be suspended, when the input signal is uncertain (such as when the input signal is in a high-impedance state), the pull-down resistor (i.e. the base-emitter resistor) can be effectively grounded to prevent the triode from being affected by noise signals and causing false operation, making the transistor cutoff more reliable, thereby improving the stability of the buzzer alarm circuit. At the same time, this resistance can also provide a discharge circuit after the triode is used as a switching tube or the power supply is turned off, reducing the discharge time.

[0048] As shown in Figure 3 and Figure 4 In one embodiment, the control circuit includes a single-chip microcomputer U1 and an LED driving chip U2 connected to each other, the ADC pin of the single-chip microcomputer U1 is connected to the cathode of the photodiode, the switch pin of the LED driving chip is connected to the anode of the light-emitting diode of the LED array, and the cathode of the light-emitting diode of the LED array is connected to the current sampling pin of the LED driving chip through a sampling resistor. The data transmission pin SDA of the single-chip microcomputer U1 is connected to the data transmission pin SDA-MOSI of the LED driving chip U2; the clock pin SCL of the single-chip microcomputer U1 is connected to the clock pin SCL-SCLK of the LED driving chip U2.

[0049] In one embodiment, the reset pin NRST of the single-chip microcomputer is connected to a reset circuit, the reset circuit includes a reset switch KEY and a capacitor C7 connected in parallel across the reset switch, one end of the capacitor is connected to the reset pin and connected to the supply voltage through a second pull-up resistor R1, and the other end is grounded.

[0050] As shown in Figure 5As shown, in one embodiment, the LED array includes an infrared LED array and a visible light LED array, the infrared LED array includes a plurality of infrared LED sub-arrays and one infrared light-emitting diode 1 located at the center of the substrate of the light source board, the visible light LED array includes a plurality of visible light LED sub-arrays 2, the infrared light-emitting diodes in the infrared LED sub-arrays are distributed in a ring shape with the center of the substrate of the light source board as the center, the visible light LED sub-arrays 2 of the visible light LED array are distributed in a ring shape with the center of the substrate of the light source board as the center, and the distance between adjacent infrared LED sub-arrays is equal, and the distance between adjacent visible light LED sub-arrays is equal. The substrate of the light source board is circular, and a photodiode LED 20 is arranged at the center of the circle.

[0051] As shown in FIG. 1, the light source board 100 includes a substrate 101, an infrared LED array 102, and a visible light LED array 103. Figure 6 As shown, in one embodiment, the infrared LED array includes 19 infrared light-emitting diodes, which are respectively a first infrared light-emitting diode LED 1, a second infrared light-emitting diode LED 2, a third infrared light-emitting diode LED 3, a fourth infrared light-emitting diode LED 4, a fifth infrared light-emitting diode LED 5, a sixth infrared light-emitting diode LED 6, a seventh infrared light-emitting diode LED 7, an eighth infrared light-emitting diode LED 8, a ninth infrared light-emitting diode LED 9, a tenth infrared light-emitting diode LED 10, an eleventh infrared light-emitting diode LED 11, a twelfth infrared light-emitting diode LED 12, a thirteenth infrared light-emitting diode LED 13, a fourteenth infrared light-emitting diode LED 14, a fifteenth infrared light-emitting diode LED 15, a sixteenth infrared light-emitting diode LED 16, a seventeenth infrared light-emitting diode LED 17, an eighteenth infrared light-emitting diode LED 18, and a nineteenth infrared light-emitting diode LED 19.

[0052] Anodes of each infrared light emitting diode are connected to a switch pin SW0 of the LED driving chip U2; cathodes of the first infrared light emitting diode LED1, the fourth infrared light emitting diode LED4, the seventh infrared light emitting diode LED7, the tenth infrared light emitting diode LED10, the thirteenth infrared light emitting diode LED13 and the sixteenth infrared light emitting diode LED16 are connected to a first current sampling pin CS0, a second current sampling pin CS1, a third current sampling pin CS2, a fourth current sampling pin CS3, a fifth current sampling pin CS4 and a sixth current sampling pin CS5 of the LED driving chip U2 respectively through sampling resistors. Cathodes of the second infrared light emitting diode LED2, the fifth infrared light emitting diode LED5, the eighth infrared light emitting diode LED8, the eleventh infrared light emitting diode LED11, the fourteenth infrared light emitting diode LED14 and the seventeenth infrared light emitting diode LED17 are connected to a seventh current sampling pin CS6, an eighth current sampling pin CS7, a ninth current sampling pin CS8, a tenth current sampling pin CS9, an eleventh current sampling pin CS10 and a twelfth current sampling pin CS11 of the LED driving chip U2 respectively through sampling resistors. Cathodes of the third infrared light emitting diode LED3, the sixth infrared light emitting diode LED6, the ninth infrared light emitting diode LED9, the twelfth infrared light emitting diode LED12, the fifteenth infrared light emitting diode LED15 and the eighteenth infrared light emitting diode LED18 are connected to a thirteenth current sampling pin CS12, a fourteenth current sampling pin CS13, a fifteenth current sampling pin CS14, a sixteenth current sampling pin CS15, a seventeenth current sampling pin CS16 and an eighteenth current sampling pin CS17 of the LED driving chip U2 respectively through sampling resistors; an anode of the nineteenth infrared light emitting diode LED19 is connected to a third switch pin SW2 of the LED driving chip U2, and a cathode thereof is connected to the first current sampling pin CS0 of the LED driving chip U2.

[0053] The visible light LED array includes six visible light LED sub-arrays, namely a first visible light LED sub-array RGB1, a second visible light LED sub-array RGB2, a third visible light LED sub-array RGB3, a fourth visible light LED sub-array RGB4, a fifth visible light LED sub-array RGB5, and a sixth visible light LED sub-array RGB6; each visible light LED sub-array includes three visible light emitting diodes, the anodes of the visible light emitting diodes of each visible light LED sub-array are connected to a second switch pin SW1 of an LED driving chip U2, the cathodes of the three visible light emitting diodes of the first visible light LED sub-array RGB1 are connected to a first current sampling pin CS0, a second current sampling pin CS1, and a third current sampling pin CS2 of the LED driving chip U2 respectively; the cathodes of the three visible light emitting diodes of the second visible light LED sub-array RGB2 are connected to a fourth current sampling pin CS3, a fifth current sampling pin CS4, and a sixth current sampling pin CS5 of the LED driving chip U2 respectively;

[0054] the cathodes of the three visible light emitting diodes of the third visible light LED sub-array RGB3 are connected to a seventh current sampling pin CS6, an eighth current sampling pin CS7, and a ninth current sampling pin CS8 of the LED driving chip U2 respectively; the cathodes of the three visible light emitting diodes of the fourth visible light LED sub-array RGB4 are connected to a tenth current sampling pin CS9, an eleventh current sampling pin CS10, and a twelfth current sampling pin CS11 of the LED driving chip U2 respectively; the cathodes of the three visible light emitting diodes of the fifth visible light LED sub-array RGB5 are connected to a thirteenth current sampling pin CS12, a fourteenth current sampling pin CS13, and a fifteenth current sampling pin CS14 of the LED driving chip U2 respectively; the cathodes of the three visible light emitting diodes of the sixth visible light LED sub-array RGB6 are connected to a sixteenth current sampling pin CS15, a seventeenth current sampling pin CS16, and an eighteenth current sampling pin CS17 of the LED driving chip U2 respectively.

[0055] Optometry system embodiment:

[0056] As Figure 7 shown, the utility model still provides a kind of optometry system, including infrared camera 6, infrared lens 5, filter 3 and light source board 4, the light source board is the light source board in above embodiment. The positional relationship of each component of optometry system is: from back to front in order: infrared camera 6, infrared lens 5, filter 3 and light source board 4, in optometry, the front of light source board 4 is the position of eyeball 7.

[0057] The optometry system of this invention can automatically adjust the light intensity of the light source plate, thereby increasing the light intensity of the light source plate when the ambient light is high, so that the light source plate provides sufficient light source and ensures that the user can perform refractive tests normally; and reducing the light intensity of the light source plate when the ambient light is low, so as to avoid irritation and discomfort to the patient's eyes.

[0058] Example of a vision screening device:

[0059] like Figure 8 As shown, this utility model also provides a vision screening device, comprising:

[0060] A wireless communication module is used for communication between the vision screening device and other devices.

[0061] The optometry system, as described in the above-mentioned optometry system embodiment, is used to detect various parameters of the eyeball;

[0062] The human-computer interaction module is used to set various parameters of the vision screening instrument;

[0063] A printing module for printing vision screening reports;

[0064] An integrated control system is connected to the wireless communication module, the optometry system, the human-computer interaction module, and the printing module, and is used to control the operation of the vision screening instrument;

[0065] The power module is used to power the circuitry of the vision screening device.

[0066] In the foregoing description of this specification, unless otherwise expressly specified and limited, the terms "fixed," "installed," "connected," or "joined" should be interpreted broadly. For example, the term "joined" can refer to a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; or it can refer to the internal communication of two components or the interaction between two components. Therefore, unless otherwise expressly limited in this specification, those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0067] According to the above description of the present specification, those skilled in the art can also understand that the terms used such as "front" and the like indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings of the present specification, which are only for the purpose of facilitating the description of the present application and simplifying the description, and do not mean or imply that the device or element involved must have the specific orientation, be constructed and operated in a specific orientation, therefore the above orientation or positional relationship terms cannot be understood or interpreted as a limitation on the present application.

[0068] In addition, the terms "first" or "second" and the like used in the present specification are terms used to refer to numbers or ordinal numbers only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first" or "second" can explicitly or implicitly include at least one of the features. In the description of the present specification, the meaning of "plurality" is at least two, such as two, three or more, etc., unless otherwise specifically limited.

[0069] Although the present application has shown and described the various embodiments of the present application, it is obvious to those skilled in the art that such embodiments are provided only in an exemplary manner. Those skilled in the art will think of many changes, changes and alternatives without departing from the spirit and principles of the present application. It should be understood that various alternatives to the embodiments of the present application described herein can be used in the practice of the present application.

Claims

1. A light source panel, characterized by, The application relates to a visual acuity screening device, which comprises the following parts: an LED array for providing illumination during a visual acuity screening process; a light intensity acquisition circuit connected to a control circuit, which is used for acquiring a light intensity signal of the LED array and sending the light intensity signal to the control circuit; a control circuit connected to the LED array, which is used for adjusting the light intensity of the LED array according to the light intensity signal; a buzzer alarm circuit connected to the light intensity acquisition circuit, which is used for alarming when the voltage of the light intensity signal is greater than a voltage threshold.

2. The light source panel of claim 1, wherein, The light intensity acquisition circuit comprises a photodiode arranged at the position of a light-emitting diode of the LED array, the anode of the photodiode is grounded, the cathode of the photodiode is connected to an ADC pin of the control circuit, and the cathode of the photodiode is connected to a power supply voltage through a first pull-up resistor.

3. The light source panel of claim 2, wherein, The buzzer alarm circuit comprises a voltage division branch, a comparator, a control switch and a buzzer, one end of the buzzer is connected to a power supply voltage, the other end of the buzzer is grounded through the control switch, the controlled end of the control switch is connected to the output end of the comparator, one input end of the comparator is connected to a voltage division point of the voltage division branch, the other input end of the comparator is connected to the cathode of the photodiode, and the voltage division branch is connected between the power supply voltage and the ground.

4. The light source panel of claim 3, wherein, The control switch adopts a triode, a current-limiting resistor is connected between the base of the triode and the output end of the comparator, and a first resistor is connected in series between the base and the emitter of the triode.

5. The light source panel of claim 2, wherein, The control circuit comprises a single-chip microcomputer and an LED driving chip which are connected to each other, the ADC pin of the single-chip microcomputer is connected to the cathode of the photodiode, the switch pin of the LED driving chip is connected to the anode of the light-emitting diode of the LED array, and the cathode of the light-emitting diode of the LED array is connected to the current sampling pin of the LED driving chip through a sampling resistor.

6. The light source panel of claim 5, wherein, The reset pin of the single-chip microcomputer is connected to a reset circuit, the reset circuit comprises a reset switch and a capacitor connected in parallel to the reset switch, one end of the capacitor is connected to the reset pin and connected to the power supply voltage through a second pull-up resistor, and the other end of the capacitor is grounded.

7. The light source panel according to any one of claims 1 to 6, wherein The LED array comprises an infrared LED array and a visible light LED array, the infrared LED array comprises a plurality of infrared LED sub-arrays and one infrared light-emitting diode arranged at the center of the substrate of a light source plate, the visible light LED array comprises a plurality of visible light LED sub-arrays, the infrared light-emitting diodes in the infrared LED sub-arrays are distributed in a ring shape with the center of the substrate of the light source plate as the center, the visible light LED sub-arrays of the visible light LED array are distributed in a ring shape with the center of the substrate of the light source plate as the center, the distance between adjacent infrared LED sub-arrays is equal, and the distance between adjacent visible light LED sub-arrays is equal.

8. An optometry system characterized by, The application further relates to a visual acuity screening device, which comprises an infrared camera, an infrared lens, a filter and a light source plate, and the light source plate is the light source plate as claimed in any one of claims 1 to 7.

9. A vision screener, characterized by, The application further relates to a visual acuity screening device, which comprises the following parts: a wireless communication module for communication between the visual acuity screening device and other devices; an optometry system which adopts the optometry system as claimed in claim 8 and is used for detecting various parameters of eyeballs; a man-machine interaction module which is used for setting various parameters of the visual acuity screening device. a printing module configured to print the vision screening report; an integrated control system connected to the wireless communication module, the optometry system, the human-computer interaction module and the printing module, and configured to control the operation of the vision screening instrument; a power module configured to supply power to the circuit of the vision screening instrument.

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