A vision measuring device and control method thereof

Abstract

The present invention discloses a vision measuring device and a control method thereof, comprising a housing, an infrared light source module, a camera module, an environmental factor monitoring module, a control processing module and a display module; wherein an attention attracting module for attracting attention is also installed in the housing. The vision measuring device and the control method thereof disclosed in the present invention are configured with an attention attracting module to attract the attention of infants and young children. During measurement, infants and young children are attracted by the attention attracting module, and their eyes will stare at the vision measuring device, so that the vision measurement of infants and young children can be completed quickly, and the accuracy of the vision measurement results is improved, thereby improving the performance of the product.

Description

Technical Field

[0001] The present invention relates to the technical field of vision measurement or detection, and in particular to a vision measurement device and a control method thereof. Background Art

[0002] Vision measuring equipment is used to measure the refractive power of the eye to evaluate the vision condition of the eye and provide a reference for fitting glasses.

[0003] The detection methods of diopter include: double slit photo-optometry, eccentric photo-optometry, etc. Double slit photo-optometry and eccentric photo-optometry use the brightness gradient in the pupil of the human eye as the basis for determining the refractive state of the human eye. That is, the image of the pupil is converted into a grayscale gradient. After obtaining the grayscale gradient, the corresponding diopter is then found through the diopter-grayscale gradient comparison table.

[0004] When measuring vision, the human eye needs to stare at the lens barrel of the vision measuring device and remain motionless for a certain period of time to obtain accurate results.

[0005] However, infants and young children have a short attention span and low cooperation. During measurement, their eyes may not be fixed on the lens, the measurement speed is slow, and the measurement results are sometimes biased. The performance of the product needs to be improved.

[0006] In view of this, it is necessary to provide a vision measuring device and a control method thereof that can attract the attention of infants and young children to improve the measurement speed and measurement effect. Summary of the invention

[0007] The object of the present invention is to provide a vision measuring device and a control method thereof which can attract the attention of infants and young children to improve the measuring speed and measuring effect.

[0008] The technical solution of the present invention provides a vision measurement device, including a housing, an infrared light source module, a camera module, an environmental factor monitoring module, a control processing module and a display module;

[0009] The infrared light source module, the camera module, the environmental factor monitoring module and the control processing module are all installed in the cavity of the housing, and the infrared light source module is located in front of the camera module;

[0010] The front end of the housing is provided with a front light hole, in which a dustproof lens is installed;

[0011] The infrared light source module comprises a light-transmitting hole coaxially arranged with the front light hole and a plurality of first light sources and a plurality of second light sources arranged around the light-transmitting hole;

[0012] Wherein, an attention attracting module for attracting attention is also installed in the shell.

[0013] In one of the optional technical solutions, when the vision measurement device is in a debugging state, a plurality of the first light sources are simultaneously in a lighting state, and the camera module, the environmental factor monitoring module, the control processing module and the display module are all in a working state;

[0014] When the vision measuring device is in a measuring state, a plurality of the second light sources are in a lighting state in sequence according to a preset order of the light sources, wherein only one of the second light sources is in a lighting state at a time, and the attention attracting module, the camera module, the control processing module and the display module are all in a working state.

[0015] In one of the optional technical solutions, the attention attracting module includes a video attracting unit located in front of the camera module;

[0016] In the radial direction of the light-transmitting hole, the video attraction unit is located outside the light-transmitting hole, and the video attraction unit is parallel to the axis of the light-transmitting hole;

[0017] The housing is also provided with a spectroscopic module for reflecting the contents of the video attraction unit and emitting the contents through the front optical port, wherein the spectroscopic module includes a spectroscopic sheet capable of reflecting visible light and transmitting infrared light;

[0018] The beam splitter is obliquely arranged on one side of the axis of the video attraction unit facing the light-transmitting hole, and the distance between the beam splitter and the video attraction unit gradually increases in the direction from back to front;

[0019] The light path of the video attraction unit is parallel to the axis of the light-transmitting hole after being reflected by the beam splitter.

[0020] In one of the optional technical solutions, the attention attracting module further includes a colored light attracting unit located in front of the infrared light source module;

[0021] The colored light attraction unit comprises a mounting bracket having a light-through hole and a plurality of colored light sources arranged at intervals around the light-through hole;

[0022] The light-through hole is coaxially arranged with the light-transmitting hole, and the light emitted by the first light source and the second light source can pass through the light-through hole.

[0023] In one of the optional technical solutions, the attention attracting module also includes a sound attracting unit.

[0024] In one of the optional technical solutions, the infrared light source module includes 2n first light sources and 2n second light source groups arranged in a staggered manner around the light-transmitting hole, where n is a natural number;

[0025] The second light source group includes a plurality of second light sources arranged at intervals along the radial direction of the light transmission hole;

[0026] When the vision measuring device is in a debugging state, 2n of the first light sources are simultaneously in a lighting state;

[0027] When the vision measuring device is in a measuring state, the 2n second light source groups are in a lighting state in sequence according to a preset sequence of light source groups, wherein only one second light source in one second light source group is in a lighting state at a time.

[0028] In one of the optional technical solutions, 2n second light source groups are symmetrically arranged around the center of the light-transmitting hole to form n second light source arrays;

[0029] When the vision measuring device is in a measuring state, the n second light source arrays are in a lighting state in sequence according to a preset sequence of the light source arrays;

[0030] When the second light source array is in a lighting state, the second light sources in the two second light source groups are lit alternately and sequentially in a sequence from outside to inside.

[0031] In one of the optional technical solutions, the infrared light source module further includes a plurality of third light sources;

[0032] In the radial direction along the light-transmitting hole, the third light source is located outside the first light source and the second light source;

[0033] Wherein, when any one of the second light sources is in a lighting state, the third light source is also in a lighting state synchronously.

[0034] In one of the optional technical solutions, the environmental factor monitoring module includes an infrared distance monitoring unit for monitoring the distance between the target to be measured and the front end of the shell and a light intensity monitoring unit for monitoring the ambient light intensity.

[0035] The technical solution of the present invention also provides a control method of a vision measuring device, comprising the following steps:

[0036] Debugging steps include:

[0037] A plurality of the first light sources are lit simultaneously,

[0038] The environmental factor monitoring module transmits the monitored distance data and light intensity data to the control processing module, and the camera module transmits the image data to the control processing module;

[0039] The control processing module processes the distance data, the illumination data and the image data and displays them through the display module, and gives corresponding adjustment prompts;

[0040] The measurement steps include:

[0041] The attention attracting module is turned on;

[0042] The second light sources are lighted one by one in sequence according to a preset order;

[0043] When each of the second light sources is turned on, the camera module captures and obtains a set of image data, and transmits the image data to the control processing module;

[0044] The control processing module processes the image data and displays it through the display module.

[0045] The above technical solution has the following beneficial effects:

[0046] The vision measuring device and control method thereof provided by the present invention are equipped with an attention attracting module to attract the attention of infants and young children. During measurement, the infants and young children are attracted by the attention attracting module and their eyes will stare at the vision measuring device, so that the vision measurement of the infants and young children can be completed quickly, and the accuracy of the vision measurement results is improved, thereby improving the performance of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 A schematic diagram of the structure of a vision measuring device provided by an embodiment of the present invention;

[0048] Figure 2 is a cross-sectional view of the shell along the front-to-back direction;

[0049] Figure 3 for Figure 1 The schematic diagram of the visual acuity measuring device shown with the housing removed;

[0050] Figure 4 It is a structural front view of the infrared light source module;

[0051] Figure 5 is a schematic diagram of the second light sources in the two second light source groups being alternately and sequentially lit in an order from outside to inside when the second light source array is in a lit state;

[0052] Figure 6 A front view of the unit for attracting colored lights;

[0053] Figure 7 It is a signal connection diagram of the infrared light source module, the camera module, the environmental factor monitoring module, the attention attracting module, the display module and the control processing module;

[0054] Figure 8 This is a schematic diagram of visual acuity measurement using a visual acuity measurement device;

[0055] Fig. 9 It is the relationship curve between spherical mirror degree and gray gradient;

[0056] Fig.10 It is the image after grayscale gradient fitting in the center area of ​​pupil, where the horizontal coordinate is the number of pixels, the vertical coordinate is the grayscale value, and the slope of a straight line connecting multiple points is the grayscale gradient. DETAILED DESCRIPTION

[0057] The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings. The same components are represented by the same reference numerals. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the accompanying drawings, and the words "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0058] like Figure 1-4 and Figure 7 As shown, a vision measuring device provided by an embodiment of the present invention includes a housing 1 , an infrared light source module 2 , a camera module 3 , an environmental factor monitoring module 4 , a control processing module 5 and a display module 6 .

[0059] The infrared light source module 2 , the camera module 3 , the environmental factor monitoring module 4 and the control processing module 5 are all installed in the cavity 11 of the housing 1 , and the infrared light source module 2 is located in front of the camera module 3 .

[0060] The front end of the housing 1 has a front light hole 12 , in which a dustproof lens 9 is installed.

[0061] The infrared light source module 2 has a light-transmitting hole 22 coaxially arranged with the front light hole 12 , and a plurality of first light sources 23 and a plurality of second light sources 24 arranged around the light-transmitting hole 22 .

[0062] An attention attracting module 7 for attracting attention is also installed in the housing 1.

[0063] The vision measuring device provided in the embodiment of the present invention can also be referred to as a vision detection device. The vision measuring device provided in the embodiment of the present invention is used for measuring or detecting human vision. By arranging the attention attracting module 7, it can attract the attention of infants and young children, which is beneficial to improving the measurement or detection speed and improving the measurement or detection quality. Therefore, the vision measuring device can also be regarded as a vision measuring device dedicated to infants and young children.

[0064] Specifically, the vision measuring device is mainly composed of a housing 1 , an infrared light source module 2 , a camera module 3 , an environmental factor monitoring module 4 , a control processing module 5 , a display module 6 and an attention attracting module 7 .

[0065] The housing 1 has a cavity 11 therein. The infrared light source module 2, the camera module 3, the environmental factor monitoring module 4, the control processing module 5 and the attention attracting module 7 are respectively installed in the cavity 11 of the housing 1. The display module 6 can be installed at the rear end of the cavity 11, and a window 13 is provided at the rear end of the housing 1 so that the display module 6 can be viewed by the user. The display module 6 is also installed outside the cavity 11, directly installed on the outer surface of the housing 1.

[0066] The infrared light source module 2 is a mechanism for providing a light source, which is used to provide an infrared light source. The infrared light source module 2 is located in front of the lens 31 of the camera module 3. The infrared light source module 2 has a mounting plate 21, and a light-transmitting hole 22 is provided in the middle of the mounting plate 21, and the light-transmitting hole 22 is coaxially arranged with the front light hole 12. The infrared light source module 2 also includes a plurality of first light sources 23 and a plurality of second light sources 24 surrounding the light-transmitting hole 22. The first light source 23 and the second light source 24 are both mounted on the front side of the mounting plate 21. During debugging, the first light source 23 is lit, and during measurement or detection, the second light source 24 is lit in a certain order. The first light source 23 and the second light source 24 are both infrared light sources, and are both used to illuminate the pupil of the eye. The first light source 23 and the second light source 24 are respectively connected to the control processing module 5 by signal. The control processing module 5 can control the switches of the first light source 23 and the second light source 24 and obtain the illumination data of the first light source 23 and the second light source 24.

[0067] The camera module 3 is a camera for photographing pupil images. The camera module 3 stores the photographed pupil images and transmits them to the control processing module 5 for subsequent processing.

[0068] The environmental factor monitoring module 4 is a mechanism for monitoring environmental parameters, which is installed at a designated position in the cavity 11. The environmental factor monitoring module 4 is used to monitor the distance between the target to be measured (e.g., a human face) and the front end of the housing 1, so that the control processing module 5 can determine whether the distance is appropriate. The environmental factor monitoring module 4 is also used to monitor the ambient light illumination, so that the control processing module 5 can determine whether the ambient light illumination meets the requirements. The environmental factor monitoring module 4 works during debugging, which helps to adjust the vision measurement device to the optimal state and improve the detection accuracy.

[0069] The control processing module 5 has the function of controlling the operation of each module and also has the function of processing data, images, etc. The control processing module 5 can be a controller, a chip, etc.

[0070] The display module 6 is a display screen, which is used to display data, images, information, etc.

[0071] The attention attracting module 7 is a mechanism for attracting the attention of people (especially infants and young children) by producing video, audio or light.

[0072] The infrared light source module 2, the camera module 3, the environmental factor monitoring module 4, the display module 6 and the attention attracting module 7 are respectively connected to the control processing module 5 by signals, for example, by wires, to achieve data transmission. The control processing module 5 can control the switches of the above modules.

[0073] The infrared light source module 2 transmits the light brightness signal to the control processing module 5. The camera module 3 transmits the captured image data to the control processing module 5. The environmental factor monitoring module 4 transmits the monitored distance signal and light intensity signal to the control processing module 5. The control processing module 5 can process the above data and make a comparison to determine whether the environmental factors and the image meet the requirements, and generate corresponding prompt information to be displayed on the display module 6. The user can adjust the environmental parameters and imaging parameters according to the prompt information to adjust the vision measurement device to the optimal state.

[0074] When measuring vision, the attention attracting module 7 is turned on to attract the attention of the infant 100 and make it look towards the vision measuring device, so that the vision measurement of the infant 100 can be completed quickly, the accuracy of the vision measurement results is improved, and the performance of the product is improved.

[0075] In summary, the vision measuring device provided by the present invention is equipped with an attention attracting module 7 to attract the attention of the infant 100. During measurement, the infant 100 is attracted by the attention attracting module 7, and the eyes will stare at the vision measuring device, which can quickly complete the vision measurement of the infant 100, improve the accuracy of the vision measurement result, and enhance the performance of the product.

[0076] In one embodiment, in combination Figure 4 As shown, when the vision measuring device is in the debugging state, the multiple first light sources 23 are simultaneously in the lighting state, and the camera module 3, the environmental factor monitoring module 4, the control processing module 5 and the display module 6 are all in the working state.

[0077] When the vision measuring device is in the measuring state, the multiple second light sources 24 are in the lighting state in sequence according to the preset order of the light sources, wherein only one second light source 24 is in the lighting state at a time, and the attention attracting module 7, the camera module 3, the control processing module 5 and the display module 6 are all in the working state.

[0078] Each second light source 24 is an eccentric light source. The lighting of the second light source 24 forms an infrared eccentric optical path system with the entire optical path. The light emitted by the eccentric second light source 24 enters the human eye. Due to the refractive state of the human eye, the incident light forms a diffuse spot on the retina, and the diffuse spot is diffusely reflected on the retina, and the light is projected into the camera module 3 through the pupil to form an image. The pupil image captured by the camera module 3 varies depending on the refractive state of the eye being measured. When the refractive state of the human eye is normal, the grayscale in the pupil captured by the camera module 3 is uniform, without any difference in light and dark; when the refractive state of the human eye is abnormal (myopia or hyperopia), the grayscale in the pupil captured by the camera module 3 has obvious differences in light and dark, and the size of the difference in light and dark reflects the degree of myopia or hyperopia.

[0079] The second light sources 24 are lighted one by one in sequence according to a preset order, and different pupil images can be obtained in sequence to obtain a more accurate refractive state of the human eye.

[0080] Combination Figure 8-10 As shown, when the vision measuring device is used to measure the vision of an infant 100, the operation method or control method is as follows:

[0081] First debug the vision measurement device. The specific operations are as follows:

[0082] The infant 100 is at a certain distance L from the front end of the vision measuring device, and the appropriate distance L=1±0.05m.

[0083] All the first light sources 23 are lit at the same time. The environmental factor monitoring module 4 monitors the distance from the face to the front end of the vision measuring device and the light intensity of the photographing environment. The camera module 3 photographs the pupil of the infant 100 and generates an image.

[0084] The distance data and illumination data monitored by the environmental factor monitoring module 4 and the image data generated by the camera module 3 are all transmitted to the control processing module 5 .

[0085] The control processing module 5 performs comparison and judgment, and generates prompt information or images based on the comparison and judgment results, and finally displays them through the display module 6 so that the user can make adjustments according to the prompt information or images.

[0086] Appropriate distance threshold, illumination threshold and image data threshold are preset in the control processing module 5. The distance threshold, illumination threshold and image data threshold can be preset according to actual needs.

[0087] If the distance from the face to the front end of the vision measurement device is greater than the distance threshold, the vision measurement device is moved toward the infant 100 until the distance from the face to the front end of the vision measurement device is within the distance threshold; if the distance from the face to the front end of the vision measurement device is less than the distance threshold, the vision measurement device is moved away from the infant 100 until the distance from the face to the front end of the vision measurement device is within the distance threshold. As needed, the vision measurement device can be mounted on a bracket and can slide back and forth on the bracket to improve stability when the vision measurement device is moved back and forth.

[0088] If the illumination of the shooting environment is greater than the illumination threshold, increase the exposure time. When the ambient illumination is high, due to the physiological characteristics of the human eye, the pupil will shrink, the amount of light entering the eye will decrease, and the captured pupil image will be dark. At this time, the exposure time needs to be increased to ensure the brightness of the pupil image and the obvious pupil gradient.

[0089] If the light intensity of the shooting environment is less than the light intensity threshold, the exposure time will be reduced. When the ambient light intensity is low, the pupil will be larger, the amount of light entering will increase, and the pupil gradient will increase. In order to avoid exceeding the preset normal range of the gradient, the exposure time needs to be reduced.

[0090] If the image data is lower than the image data threshold, for example, the pupil image is dark, it is adjusted by increasing the exposure time.

[0091] After the adjustment is completed, it means that the vision measuring device is in the best condition.

[0092] After debugging is completed, perform vision measurement. The specific operations are as follows:

[0093] The attention attracting module 7 is turned on to attract the attention of the infant 100 and make it look towards the vision measuring device. The second light sources 24 are turned on one by one in a preset order. When each second light source 24 is turned on, the camera module 3 captures and obtains a set of image data, and transmits the image data to the control processing module 5. The control processing module 5 processes the image data and obtains the grayscale gradient of the pupil of the infant 100. The control processing module 5 is preset with Fig. 9 The relationship diagram or comparison table between spherical mirror power and grayscale gradient shown in the figure can be made from a large amount of previous experimental data.

[0094] The control processing module 5 finds the corresponding spherical degree from the relationship diagram or comparison table of spherical degree and grayscale gradient according to the actual grayscale gradient. After obtaining the spherical degree of the image data taken by the camera module 3 when the second light source 24 of each angle is turned on, the comprehensive refractive state data can be calculated by the existing formula, including: spherical degree, cylindrical degree, and astigmatism axis. Finally, the refractive state data is displayed by the display module 6.

[0095] The processing method of the grayscale gradient obtained by the control processing module 5 after processing the image data can be referred to the content in the prior art, which is not the invention point of this case and is briefly introduced below:

[0096] The pupil ROI area of ​​the human eye is detected, the highlight in the pupil is removed, the grayscale gradient of the center area of ​​the pupil is obtained, and the grayscale gradient of the center area of ​​the pupil is fitted with the image by the least squares method, such as Fig.10 As shown, a grayscale gradient is obtained.

[0097] The following takes the spherical powers in three directions as an example: r0, r60, and r120 are the spherical powers of the second light source 24 at directions of 0 degrees, 60 degrees, and 120 degrees, respectively.

[0098] When the second light source 24 at 0 degrees is turned on, the camera module 3 captures the corresponding image and transmits the image data to the control processing module 5 for processing. The control processing module 5 obtains the corresponding grayscale gradient in the above manner, and then finds the corresponding spherical degree r0 from the relationship diagram or comparison table between the spherical degree and the grayscale gradient. R60 and R120 are obtained in a similar manner.

[0099] The three parameters A, B and D are calculated based on r0, r60 and r120.

[0100]

[0101] Based on the three parameters A, B, and D, the comprehensive spherical power sph, cylindrical power cyl, and astigmatism axis are calculated.

[0102]

[0103] The above calculation formula and calculation method are an existing calculation method for obtaining the comprehensive refractive state, and its content will not be described in detail.

[0104] In one embodiment, if Figure 1 and Figure 3 As shown, the attention attracting module 7 includes a video attracting unit 71 located in front of the camera module 3 .

[0105] In the radial direction along the light-transmitting hole 22 , the video attraction unit 71 is located outside the light-transmitting hole 22 , and the video attraction unit 71 is parallel to the axis of the light-transmitting hole 22 .

[0106] The housing 1 is also provided with a spectroscopic module 8 for reflecting the contents of the video attraction unit 71 and emitting the contents through the front optical port 12 . The spectroscopic module 8 includes a spectroscopic sheet 81 capable of reflecting visible light and transmitting infrared light.

[0107] The beam splitter 81 is arranged obliquely on one side of the axis of the video attraction unit 71 facing the light transmission hole 22, and the distance between the beam splitter 81 and the video attraction unit 71 gradually increases in the direction from back to front.

[0108] The light path of the video attraction unit 71 is parallel to the axis of the light-transmitting hole 22 after being reflected by the beam splitter 81 .

[0109] In this embodiment, the attention attracting module 7 adopts a video attracting unit 71, which is installed in front of the lens 31 of the camera module 3. The video attracting unit 71 is signal-connected to the control processing module 5. The control processing module 5 can control the switch of the video attracting unit 71.

[0110] The video attraction unit 71 is a video playback screen. In order to avoid blocking the propagation of infrared rays, the video attraction unit 71 is offset outside the light transmission hole 22, and the video attraction unit 71 is horizontally arranged to extend forward and backward or parallel to the axis of the light transmission hole 22.

[0111] The spectroscopic module 8 is used to emit the video content of the video attraction unit 71 from the front optical port 12. The spectroscopic module 8 includes a spectroscopic sheet 81, which can reflect visible light and transmit infrared light. The spectroscopic sheet 81 is arranged obliquely on the inner side of the video attraction unit 71. The spectroscopic sheet 81 can reflect the visible light emitted by the video attraction unit 71 forward so that the visible light is emitted through the front optical port 12. The spectroscopic sheet 81 will not hinder the infrared light propagating toward the lens 31. The infant 100 can see the video content on the spectroscopic sheet 81, which attracts the infant 100 to look at the vision measuring device.

[0112] As required, the video attraction unit 71 and the beam splitter module 8 can be arranged in the space between the infrared light source module 2 and the lens 31. The beam splitter 81 is obliquely located between the light transmission hole 22 and the lens 31. The light path of the video attraction unit 71 is parallel to the axis of the light transmission hole 22 or the front light hole 12 after being reflected by the beam splitter 81, and its video content is reflected by the beam splitter 81 and emitted forward from the light transmission hole 22 and the front light port 12.

[0113] As required, the video attraction unit 71 and the beam splitter module 8 can also be arranged in the space between the infrared light source module 2 and the dustproof lens 9. The optical sheet 81 is obliquely located between the front optical hole 12 and the light transmission hole 22. The optical path of the video attraction unit 71 is parallel to the axis of the front optical hole 12 or the light transmission hole 22 after being reflected by the beam splitter 81, and its video content is emitted forward from the front optical port 12 after being reflected by the beam splitter 81.

[0114] In one embodiment, if Figure 1 , Figure 3 and Figure 6 As shown, the attention attracting module 7 also includes a colored light attracting unit 72 located in front of the infrared light source module 2 .

[0115] The colored light attraction unit 72 includes a mounting bracket 721 having a light-through hole 722 and a plurality of colored light sources 723 arranged at intervals around the light-through hole 722 .

[0116] The light-through hole 722 is coaxially arranged with the light-transmitting hole 22 , and the light emitted by the first light source 23 and the second light source 24 can pass through the light-through hole 722 .

[0117] In this embodiment, the attention attracting module 7 uses a colored light attracting unit 72, which is located in front of the infrared light source module 2. The colored light attracting unit 72 is connected to the control processing module 5 by signal. The control processing module 5 can control the switch of the colored light attracting unit 72.

[0118] The colored light attraction unit 72 includes a mounting bracket 721 and a plurality of colored light sources 723. The mounting bracket 721 has a light-through hole 722, which is coaxially arranged with the light-transmitting hole 22. The plurality of colored light sources 723 are arranged at intervals around the light-through hole 722. The colored light sources 723 are located at the front side of the mounting bracket 721. The radius of the light-through hole 722 is greater than the radius of the light-transmitting hole 22, and the light emitted by the first light source 23 and the second light source 24 can pass through the light-through hole 722.

[0119] As required, a notch 724 communicating with the light-through hole 722 is provided on the mounting bracket 721 so as to Figure 4 The second light source unit 26 shown provides an escape space so that the light of each second light source 24 in the second light source unit 26 can propagate forward through the notch portion 724 .

[0120] As required, a through hole 725 is provided at the edge of the mounting bracket 721. Figure 4 The third light source 25 is shown aligned so that the light of the third light source 25 propagates forwards.

[0121] The colored light source 723 can be a single-color light source or a combined-color light source, for example, a yellow light source, a red light source, a purple light source, etc., or a combination of several of them.

[0122] During measurement or detection, the colored light source 723 is turned on to attract the infant 100 to look at the vision measuring device.

[0123] In one embodiment, if Figure 1 and Figure 3 As shown, the attention attracting module 7 also includes a sound attracting unit 73.

[0124] In this embodiment, the attention attracting module 7 uses a sound attracting unit 73, such as a speaker, a horn, etc. The sound attracting unit 73 is signal-connected to the control processing module 5. The control processing module 5 can control the switch of the sound attracting unit 73.

[0125] During measurement or detection, the sound attraction unit 73 starts playing music to attract the infant 100 to look at the vision measuring device.

[0126] In one embodiment, if Figure 4 As shown, the infrared light source module 2 includes 2n first light sources 23 and 2n second light source groups 26 which are arranged alternately around the light-transmitting hole 22, where n is a natural number.

[0127] The second light source group 26 includes a plurality of second light sources 24 arranged at intervals along the radial direction of the light transmission hole 22 .

[0128] When the vision measuring device is in the debugging state, the 2n first light sources 23 are simultaneously in the lighting state.

[0129] When the vision measuring device is in the measuring state, the 2n second light source groups 26 are in the lighting state in sequence according to the preset sequence of the light source groups, wherein only one second light source 24 in one second light source group 26 is in the lighting state each time.

[0130] In this embodiment, the infrared light source module 2 includes an even number of first light sources 23 and an even number of second light source groups 26. Each second light source group 26 includes three or more second light sources 24 arranged in a row.

[0131] An even number of first light sources 23 and an even number of second light source groups 26 are arranged alternately around the light transmission hole 22. That is, there is a second light source group 26 between every two adjacent first light sources 23, and there is a first light source 23 between every two adjacent second light source groups 26. The plurality of second light sources 24 in each second light source group 26 are arranged at intervals along the radial direction of the light transmission hole 22.

[0132] When the vision measuring device is in the measuring state, the even number of second light source groups 26 are lit in sequence according to the preset sequence of the light source groups, and only one second light source 24 in the second light source group 26 is lit each time. When each second light source 24 is lit, the camera module 3 captures and obtains a set of image data.

[0133] The second light sources 24 in each second light source group 26 are at different distances from the central axis. When the second light sources 24 at different positions are turned on, the camera module 3 obtains slightly different image data. By taking multiple sets of image data and averaging them, the measurement accuracy can be improved.

[0134] In one embodiment, if Figure 4-5 As shown, 2n second light source groups 26 are symmetrically arranged around the center of the light-transmitting hole 22 to form n second light source arrays 27 .

[0135] When the vision measuring device is in the measuring state, the n second light source arrays 27 are in the lighting state in sequence according to the preset sequence of the light source arrays.

[0136] When the second light source array 27 is in the lighting state, the second light sources 24 in the two second light source groups 26 are lit alternately and sequentially in the order from the outside to the inside.

[0137] In this embodiment, two second light source groups 26 arranged symmetrically with respect to the center of the light-transmitting hole 22 form a second light source array 27. When the vision measuring device is in the measuring state, the second light source array 27 is lit in sequence, and only one second light source 24 of one second light source group 26 on one side of the second light source array 27 is lit each time. When each second light source array 27 is lit, the second light sources 24 in the two second light source groups 26 symmetrically at the center are alternately lit in sequence from the outside to the inside. That is, the outermost second light source 24 in the first second light source group 26 is lit first, and then the outermost second light source 24 in the second second light source group 26 is lit, and then the second second light source 24 from the outside to the inside in the first second light source group 26 is lit, and then the second second light source 24 from the outside to the inside in the second second light source group 26 is lit, and so on, so that the second light sources 24 are alternately lit in a centrally symmetrical manner as much as possible. When every two symmetrical second light sources 24 are lit, the two sets of image data captured by the camera module 3 have extremely high similarity.

[0138] like Figure 5 As shown, taking the horizontally arranged second light source array 27 as an example, the second light sources 24 in the two second light source groups 26 are lit in sequence in the order of i, ii, iii, iv, v, and vi.

[0139] In one embodiment, if Figure 4 As shown, the infrared light source module 2 further includes a plurality of third light sources 25 .

[0140] In the radial direction along the light-transmitting hole 22 , the third light source 25 is located outside the first light source 23 and the second light source 24 .

[0141] When any one of the second light sources 24 is in the lighting state, the third light source 25 is also in the lighting state synchronously.

[0142] In this embodiment, the third light source 25 plays a compensatory role. The third light source 25 is farthest from the center of the light-transmitting hole 22, and its light emitting angle and light emitting range are different from those of the second light source 24. The third light source 25 is connected to the control processing module 5 by signal, and the control processing module 5 can control the switch of the third light source 25 and obtain the illumination data of the third light source 25.

[0143] When the second light source 24 is turned on, the image data captured by the camera module 3 can be converted into corresponding parameter data, such as grayscale gradient, by the control processing module 5 .

[0144] When the third light source 25 is turned on, the image data captured by the camera module 3 can be converted into corresponding compensation parameter data, such as compensation grayscale gradient, by the control processing module 5 .

[0145] For example, when a second light source 24 is turned on, the corresponding parameter data fluctuates greatly and exceeds the normal range. Compensation parameter data can be used to correct it so that when each second light source 24 is turned on, the parameter data corresponding to the image data captured by the camera module 3 is within the normal range.

[0146] In one embodiment, if Figure 1 and Figure 3 As shown, the environmental factor monitoring module 4 includes an infrared distance monitoring unit 41 for monitoring the distance between the target to be measured and the front end of the housing 1 and a light intensity monitoring unit 42 for monitoring the ambient light intensity.

[0147] In this embodiment, the environmental factor monitoring module 4 includes an infrared distance monitoring unit 41 and a light intensity monitoring unit 42. The infrared distance monitoring unit 41 and the light intensity monitoring unit 42 are respectively connected to the control processing module 5 by signal. The control processing module 5 can control the switch of the infrared distance monitoring unit 41 and the light intensity monitoring unit 42 and obtain the data of the infrared distance monitoring unit 41 and the light intensity monitoring unit 42.

[0148] The infrared distance monitoring unit 41 may be an infrared distance sensor, which is used to monitor the distance between the face and the vision measuring device. The light intensity monitoring unit 42 may be a light intensity monitoring sensor, which is used to monitor the light intensity of the shooting environment of the camera module 3 .

[0149] By providing the infrared distance monitoring unit 41, the distance between the person being measured and the device can be accurately controlled, which facilitates the adjustment of the distance.

[0150] By providing the light intensity monitoring unit 42, the shooting measurement can be achieved by increasing the exposure time in a relatively high brightness (170 lux) environment.

[0151] By shortening the exposure time, the vision measuring device can complete the detection of human eye refractive power within 0.5 s.

[0152] Although infants and young children are mainly used as examples for description in the embodiments of the present invention, the vision measuring device provided by the present invention can certainly be used for refractive testing of adults.

[0153] Combination Figure 1-10 As shown, a control method of a vision measurement device provided by an embodiment of the present invention comprises the following steps:

[0154] Debugging steps include:

[0155] The plurality of first light sources 23 are lit simultaneously.

[0156] The environmental factor monitoring module 4 transmits the monitored distance data and light intensity data to the control processing module 5 , and the camera module 3 transmits the image data to the control processing module 5 .

[0157] The control processing module 5 processes the distance data, illumination data and image data and displays them through the display module 6, and gives corresponding adjustment prompts.

[0158] The measurement steps include:

[0159] The attention attracting module 7 is turned on.

[0160] The second light sources 24 are lighted one by one in sequence according to a preset order.

[0161] When each second light source 24 is turned on, the camera module 3 captures and obtains a set of image data, and transmits the image data to the control processing module 5 .

[0162] The control processing module 5 processes the image data and displays it through the display module 6 .

[0163] When the vision measuring device is used to measure the vision of the infant 100, the operation method or control method is as follows:

[0164] First debug the vision measurement device. The specific operations are as follows:

[0165] The infant 100 is at a certain distance L from the front end of the vision measuring device, and the appropriate distance L=1±0.05m.

[0166] All the first light sources 23 are lit at the same time. The environmental factor monitoring module 4 monitors the distance from the face to the front end of the vision measuring device and the light intensity of the photographing environment. The camera module 3 photographs the pupil of the infant 100 and generates an image.

[0167] The distance data and illumination data monitored by the environmental factor monitoring module 4 and the image data generated by the camera module 3 are all transmitted to the control processing module 5 .

[0168] The control processing module 5 performs comparison and judgment, and generates prompt information or images based on the comparison and judgment results, and finally displays them through the display module 6 so that the user can make adjustments according to the prompt information or images.

[0169] Appropriate distance threshold, illumination threshold and image data threshold are preset in the control processing module 5. The distance threshold, illumination threshold and image data threshold can be preset according to actual needs.

[0170] If the distance from the face to the front end of the vision measurement device is greater than the distance threshold, the vision measurement device is moved toward the infant 100 until the distance from the face to the front end of the vision measurement device is within the distance threshold; if the distance from the face to the front end of the vision measurement device is less than the distance threshold, the vision measurement device is moved away from the infant 100 until the distance from the face to the front end of the vision measurement device is within the distance threshold. As needed, the vision measurement device can be mounted on a bracket and can slide back and forth on the bracket to improve stability when the vision measurement device is moved back and forth.

[0171] If the illumination of the shooting environment is greater than the illumination threshold, increase the exposure time. When the ambient illumination is high, due to the physiological characteristics of the human eye, the pupil will shrink, the amount of light entering the eye will decrease, and the captured pupil image will be dark. At this time, the exposure time needs to be increased to ensure the brightness of the pupil image and the obvious pupil gradient.

[0172] If the light intensity of the shooting environment is less than the light intensity threshold, the exposure time will be reduced. When the ambient light intensity is low, the pupil will be larger, the amount of light entering will increase, and the pupil gradient will increase. In order to avoid exceeding the preset normal range of the gradient, the exposure time needs to be reduced.

[0173] If the image data is lower than the image data threshold, for example, the pupil image is dark, it is adjusted by increasing the exposure time.

[0174] After the adjustment is completed, it means that the vision measuring device is in the best condition.

[0175] After debugging is completed, perform vision measurement. The specific operations are as follows:

[0176] The attention attracting module 7 is turned on to attract the attention of the infant 100 and make it look towards the vision measuring device. The second light sources 24 are turned on one by one in a preset order. When each second light source 24 is turned on, the camera module 3 captures and obtains a set of image data, and transmits the image data to the control processing module 5. The control processing module 5 processes the image data and obtains the grayscale gradient of the pupil of the infant 100. The control processing module 5 is preset with Fig. 9 The relationship diagram or comparison table between spherical mirror power and grayscale gradient shown in the figure can be made from a large amount of previous experimental data.

[0177] The control processing module 5 finds the corresponding spherical degree from the relationship diagram or comparison table of spherical degree and grayscale gradient according to the actual grayscale gradient. After obtaining the spherical degree of the image data taken by the camera module 3 when the second light source 24 of each angle is turned on, the comprehensive refractive state data including spherical degree, cylindrical degree and astigmatism axis are calculated by the formula. Finally, the refractive state data is displayed by the display module 6.

[0178] In summary, the vision measuring device and control method thereof provided by the present invention are configured with an attention attracting module to attract the attention of infants and young children. During measurement, the infants and young children are attracted by the attention attracting module and their eyes will stare at the vision measuring device, which can quickly complete the vision measurement of the infants and young children, improve the accuracy of the vision measurement results, and enhance the performance of the product.

[0179] As needed, the above technical solutions can be combined to achieve the best technical effect.

[0180] The above description is only the principle and preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this field, several other modifications can be made based on the principle of the present invention, which should also be considered as the protection scope of the present invention.

Claims

1. A vision measuring device, characterized in that: It includes a housing, an infrared light source module, a camera module, an environmental factor monitoring module, a control processing module and a display module; The infrared light source module, the camera module, the environmental factor monitoring module and the control processing module are all installed in the cavity of the housing, and the infrared light source module is located in front of the camera module; The front end of the housing is provided with a front light hole, in which a dustproof lens is installed; The infrared light source module comprises a light-transmitting hole coaxially arranged with the front light hole and a plurality of first light sources and a plurality of second light sources arranged around the light-transmitting hole; Wherein, an attention attracting module for attracting attention is also installed in the housing, and the attention attracting module includes a video attracting unit located in front of the camera module, and along the radial direction of the light-transmitting hole, the video attracting unit is located outside the light-transmitting hole, and the video attracting unit is parallel to the axis of the light-transmitting hole, and a spectroscopic module for reflecting the content of the video attracting unit and emitting it through the front optical port is also installed in the housing; The infrared light source module comprises 2n first light sources and 2n second light source groups which are arranged in a staggered manner around the light-transmitting hole, wherein the 2n second light source groups are symmetrically arranged around the center of the light-transmitting hole to form an n second light source array, where n is a natural number; and the second light source group comprises a plurality of second light sources which are arranged at intervals along the radial direction of the light-transmitting hole; When the vision measuring device is in a debugging state, 2n of the first light sources are simultaneously in a lighting state; When the vision measuring device is in a measuring state, 2n second light source groups are in a lighting state in sequence according to a preset sequence of light source groups, wherein only one second light source in one second light source group is in a lighting state at a time; wherein n second light source arrays are in a lighting state in sequence according to a preset sequence of light source arrays, wherein only one second light source in one second light source group on one side of the second light source array is lit at a time; when each second light source array is in a lighting state, the second light sources in two centrally symmetrical second light source groups are alternately lit in sequence from outside to inside, so that the second light sources in each second light source array are alternately lit in a centrally symmetrical manner; The environmental factor monitoring module includes an illumination monitoring unit for monitoring the ambient light illumination. If the illumination of the photographing environment is greater than an illumination threshold, the exposure time is increased to ensure the brightness of the pupil image and an obvious pupil gradient.

2. The vision measuring device according to claim 1, characterized in that: When the vision measurement device is in a debugging state, the plurality of first light sources are simultaneously in a lighting state, and the camera module, the environmental factor monitoring module, the control processing module and the display module are all in a working state; When the vision measuring device is in a measuring state, a plurality of the second light sources are in a lighting state in sequence according to a preset order of the light sources, wherein only one of the second light sources is in a lighting state at a time, and the attention attracting module, the camera module, the control processing module and the display module are all in a working state.

3. The vision measuring device according to claim 1 or 2, characterized in that: The light splitting module includes a light splitter capable of reflecting visible light and transmitting infrared light; The beam splitter is obliquely arranged on one side of the axis of the video attraction unit facing the light-transmitting hole, and the distance between the beam splitter and the video attraction unit gradually increases in the direction from back to front; The light path of the video attraction unit is parallel to the axis of the light-transmitting hole after being reflected by the beam splitter.

4. The vision measuring device according to claim 1 or 2, characterized in that: The attention attracting module further comprises a colored light attracting unit located in front of the infrared light source module; The colored light attraction unit comprises a mounting bracket having a light-through hole and a plurality of colored light sources arranged at intervals around the light-through hole; The light-through hole is coaxially arranged with the light-transmitting hole, and the light emitted by the first light source and the second light source can pass through the light-through hole.

5. The vision measuring device according to claim 1 or 2, characterized in that: The attention attracting module also includes a sound attracting unit.

6. The vision measuring device according to claim 1, characterized in that: The infrared light source module further includes a plurality of third light sources; In the radial direction along the light-transmitting hole, the third light source is located outside the first light source and the second light source; Wherein, when any one of the second light sources is in a lighting state, the third light source is also in a lighting state synchronously.

7. The vision measuring device according to claim 1, characterized in that: The environmental factor monitoring module includes an infrared distance monitoring unit for monitoring the distance between a target to be measured and a front end of the housing.

8. A control method for a vision measuring device according to any one of claims 1 to 7, characterized in that: The steps include: Debugging steps include: A plurality of the first light sources are lit simultaneously, The environmental factor monitoring module transmits the monitored distance data and light intensity data to the control processing module, and the camera module transmits the image data to the control processing module; The control processing module processes the distance data, the illumination data and the image data and displays them through the display module, and gives corresponding adjustment prompts; The measurement steps include: The attention attracting module is turned on; The second light sources are lighted one by one in sequence according to a preset order; When each of the second light sources is turned on, the camera module captures and obtains a set of image data, and transmits the image data to the control processing module; The control processing module processes the image data and displays it through the display module.

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