CN210810960U - Diagnostic device of intelligent screening strabismus and diopter - Google Patents

Abstract

The utility model discloses a diagnostic device for intelligently screening strabismus and diopter, comprising an optical system and a processing control unit. The optical system comprises a strabismus imaging optical path and a diopter imaging optical path, and the two optical paths share an infrared camera and a light source. On the arc guide and move synchronously, the infrared camera is moved to the front of the eye to detect the diopter or the light source is moved to the front of the eye to detect strabismus. The strabismus imaging optical path also includes an optotype, a grating and an optotype switching structure. The optotype is unique and fixed on the grating. And between the optotype switching structure and the light source, the grating and optotype switching structure intelligently complete the eye occlusion and sight distance switching without additional manual operation; the processing control unit includes a SOC processor, a wireless communication module, a touch screen and a power supply, and the SOC processor respectively It is connected with a wireless communication module, a touch screen, a power supply and the optical system. The device of the utility model can intelligently diagnose strabismus and diopter.

Description

A diagnostic device for intelligent screening of strabismus and diopter

technical field

The utility model relates to a medical ophthalmic photoelectric instrument, in particular to a diagnostic device for intelligently screening strabismus and diopter, which is used for strabismus screening and diopter detection.

Background technique

Children under the age of 7 are in the critical and sensitive period of visual function development. Only in a good visual environment can visual function develop normally. In early childhood, various types of strabismus, refractive errors and other diseases are prone to occur. If it is not detected early, it will often affect the normal development of children's vision, showing low vision; among them, strabismus is a common ophthalmic disease, which not only affects the appearance, but also seriously affects the patient's binocular visual function and physical and mental health. Therefore, early screening can be used as an important means to detect eye diseases and visual problems in children, so that some common eye diseases in children have the opportunity to be detected and treated early, and the incidence rate can be reduced.

At present, the diagnosis methods of strabismus in the ophthalmology department of the hospital include occlusion method, corneal mapping method, perimeter method and synoptic method. . Specifically, at present, hospitals mostly use manual methods for strabismus inspection: looking at the 33cm optotype, looking at the 6m optotype Mitsubishi mirror inspection, looking at the outdoor optotype, and covering test four measurement methods to measure the degree of strabismus, but the above traditional detection methods exist The following disadvantages: (1) Due to the rapid eye movement during the examination, a professional ophthalmologist or optometrist is required to carefully observe and confirm the diagnosis, which is time-consuming and labor-intensive; (2) The eye needs to be covered many times during the inspection with the occlusion method, and repeated tests are required. , there are differences in the time of manually covering the eyes, which will ultimately affect the test results; (3) the detected data is recorded manually, which may cause errors and ultimately affect the diagnosis results.

In addition, most of the current ophthalmic detection and diagnostic instruments can only perform strabismus screening, or can only detect diopter. If multiple ophthalmic visual items are required to be detected, multiple separate detection instruments are required, which is very important for the testing unit and the person to be tested. It is very inconvenient and more expensive.

SUMMARY OF THE INVENTION

In order to overcome the shortcomings and deficiencies in the prior art, the purpose of the present utility model is to provide a diagnostic device for intelligently screening strabismus and diopter, which is used for strabismus screening and diopter detection, and the use of this device can realize automatic diagnosis and data digitization , to avoid missed diagnosis and misdiagnosis caused by manual operation, and can carry out data analysis and statistics.

The technical scheme adopted by the utility model to solve its technical problems is:

A diagnostic device for intelligently screening strabismus and diopter, the device includes an optical system and a processing control unit, the optical system includes a strabismus imaging optical path and a diopter imaging optical path, and the strabismus imaging optical path and the diopter imaging optical path share an infrared camera and a light source, and the light source It includes the light source body and the filter set in front of the light source body. The infrared camera and the light source are arranged on the arc guide and move synchronously. The infrared camera is moved to the front of the eyes for diopter detection or the light source is moved to the front of the eyes for squint Detection, strabismus imaging optical path also includes optotype, grating and optotype switching structure, optotype is uniquely and fixedly arranged between grating and optotype switching structure and light source, grating and optotype switching structure can intelligently complete eye occlusion and visual distance Switching without manual operation; the processing control unit includes a SOC processor, a wireless communication module, a touch screen and a power supply, the SOC processor is respectively connected with the wireless communication module, the touch screen, the power supply and the optical system, and the SOC processor collects detection data , store and intelligently analyze data to obtain diagnostic results.

Further, the optical grating and the optotype switching structure include an electronic grating assembly, the electronic grating assembly includes a grating controller and a grating, the grating controller is connected with the SOC processor, and the grating is controlled by the grating controller and turns on liquid crystal, and the liquid crystal inversion occurs, Light cannot pass through and block the eyes.

Further, the grating and the optotype switching structure include a zoom control assembly, and the zoom control assembly cooperates with the optotype to achieve a viewing distance of 33cm and a simulated 6m visual distance. The zoom control assembly includes a zoom lens and an electromagnet that are connected to each other. The SOC processor is connected, and whether the electromagnet is energized or not can drive the zoom lens to move into or out of the strabismus imaging optical path, so as to realize the function of switching the sight distance.

Further, the device is provided with dual optical systems, that is, one set of the optical systems is provided for each of the left and right eyes.

Further, the device is also provided with a head support and a base structure, including a bracket, a knob, a base, a forehead support, a chin rest, a screw rod and a bevel gear, and the support and the base are vertically arranged, wherein the knob, the chin rest, the screw rod and the bevel gear. The gears form a lifting mechanism, which is arranged on the bracket, and the knob is rotated to drive the screw to rotate through the bevel gear drive, so that the chin rest can move up and down.

Further, the light source body includes a fixation lamp and a plurality of infrared lamps arranged around the fixation lamp, and the fixation lamp and the plurality of infrared lamps are arranged on the same lamp board. The application scene of the diagnostic device for intelligently screening strabismus and diopter of the utility model is: eye hospital or grassroots community hospital or optometry center (with a liftable head support bracket and base, and the screening equipment is fixed on the base for operation).

The strabismus detection principle of the utility model: the covering method and the corneal mapping method are adopted. If the light valve of the right eye is energized first, the right eye cannot see any external objects at this time, and the viewing distance is switched to 33cm through the optical system (the viewing distance can be switched between 33cm/6m), and the fixation light flashes to guide the left eye to look straight ahead. At this time, turn on the infrared light behind the light valve of the right eye, and record the position change of the reflection point of the infrared light on the pupil of the right eye (about 30s); then adjust the viewing distance to 6m and shoot; compare and analyze the pupils in the two videos The position of the reflective point of the upper infrared light changes, analyzes whether the eye position of the eyeball changes, and determines whether the right eye has strabismus.

The diopter detection principle of the utility model: adopt infrared eccentric photography optometry. The light source emits infrared light, and the infrared light is triggered synchronously with the camera. The camera obtains the illuminance gradient grayscale image reflected by the light source on the retina. The brightness of the retina of the human eye with refractive error is different from that of the normal human eye. By analyzing the light spots on the image The brightness, position and area of the human eye are calculated to calculate the diopter of the human eye.

The utility model includes two parts: an optical system and a processing control unit, wherein the optical system includes a strabismus imaging optical path and a diopter imaging optical path, the strabismus imaging optical path and the diopter imaging optical path respectively complete the strabismus and diopter detection, and the strabismus imaging optical path and the diopter imaging optical path share infrared The camera and the light source, the infrared camera and the light source are installed on an arc-shaped guide rail, and the oblique imaging optical path also includes an optotype, a grating, and an optotype switching structure, and the grating and optotype switching structure are used to complete the action of eye occlusion and sight distance switching; The actual distance between the optotype and the person to be measured is 33cm. The utility model uses the grating controller to control the opening and closing of the grating to achieve the occlusion of the eye, and the control circuit controls the electromagnet to make the zoom lens cut into the optical path to realize the line-of-sight simulation equivalent to: 6m.

The processing control unit includes an embedded SOC processor, a wireless communication module, a display screen and power management. The embedded SOC processor is used for image data acquisition and processing, image recognition, grayscale analysis and diopter calculation, and completes strabismus and diopter diagnosis; the wireless communication module is used to transmit and save data to the cloud server, and can connect to wireless printers and identity Recognizer, print diagnostic data results, user data management is safe and reliable, saving time and effort; the display screen is used to provide UI operation interface, display test data information, etc., and can perform touch operations to achieve image capture, control and storage functions; power supply Management provides power for the entire system, and battery charge and discharge management. For ease of use, the device of the present invention can be equipped with a base and a liftable head support bracket.

The device of the utility model is equipped with an electronic grating, and a control circuit is provided to energize the electronic grating to realize eye shielding: after detecting that the light valve is energized, the liquid crystal is reversed, and the light cannot pass through, thereby shielding the eyes.

The utility model has a built-in optical system capable of switching different sight distances. By designing an automatically controlled zoom lens with a fixed magnification, the sight distance of 33cm is equivalent to the actual sight distance of 6m, that is, the sight distance can be 33cm/6m. Switch between them, cooperate with the zoom lens, the visual target seen through the zoom lens becomes smaller, and the simulation is equivalent to the effect of the actual 6m visual distance. 33cm; when the viewing distance of 6m is required, the electromagnet is energized to control the zoom lens to move into the optical path, and the optotype seen through the zoom lens becomes smaller, and the distance between the optotype and the pupil is simulated to be 6m. Switch between distances, and can quickly align and locate.

The device of the utility model has a built-in infrared lamp, a fixation lamp and an infrared filter, and the stray light reflected by the cornea can be effectively eliminated through the infrared ring segment and the infrared filter, and the interference to the human eye can be reduced: when taking pictures, the fixation lamp flickers Attract people's eyes to look straight ahead, and the infrared light shines on people's eyeballs. Due to the effect of infrared filters, the interference to the human eye can be reduced.

The infrared camera of the utility model has a built-in USB3.0 high-definition camera, and the transmitted images are clear, and the speed is faster and more stable.

The infrared lamp and the camera head of the device of the utility model are mounted on an arc guide and move synchronously, and can be moved to the front of the eyes through structural design to perform diopter detection or strabismus detection.

The device of the utility model uploads the acquired image data to the server through the built-in wireless communication module, and uses the deep learning algorithm to analyze and count the data.

The device of the utility model has a built-in high-performance embedded SOC processor and an integrated image processing unit, which can realize real-time processing of high-resolution images. The embedded SOC processor has rich interfaces, small size and low power consumption, and can be powered by batteries, which greatly reduces the size of the entire product and improves and realizes the portability of the product.

The device of the utility model has a built-in liquid crystal screen and a touch screen, provides a friendly human-computer interaction interface, is convenient to operate, can check the detection data, conduct on-site analysis and timely make diagnosis results, and can manage image data.

Using the device of the utility model to carry out the digital diagnosis of strabismus includes: acquiring videos of the tested person under different covering modes, analyzing each frame of images in the obtained video, obtaining the center coordinates and position change information of the pupil, Diagnosis of strabismus can be obtained based on the information on the position change of the distance and the reflection point in the pupil.

Using the device of the utility model to carry out digital diagnosis of diopter includes: the light source emits infrared light, the infrared light is triggered synchronously with the camera, the camera obtains the illuminance gradient grayscale image reflected by the light source on the retina, and the brightness, position, and intensity of the light spot on the image are analyzed by analyzing the image. area to calculate the diopter of the human eye.

The utility model has the advantages of high technology content, friendly human-computer interaction, convenient operation, rapid and accurate screening, high intelligence, and greatly improved user experience.

Description of drawings

1 is a block diagram of the device structure of the present utility model;

Figure 2 is a schematic diagram of the oblique imaging optical path: (a) oblique imaging optical path; (b) an enlarged schematic diagram of an infrared lamp panel;

3 is a schematic diagram of the switching structure of the grating and the optotype: (a) an electronic grating assembly; (b) a zoom control assembly;

Figure 4 is a schematic diagram of a diopter imaging optical path: (a) a diopter imaging optical path; (b) an enlarged schematic diagram of an infrared lamp board;

Figure 5 is a schematic diagram of the head support and the base structure;

Fig. 6 is the flow chart of strabismus diagnosis method;

7 is a schematic diagram of a cover mode;

Figure 8 is a schematic diagram of each eye position and type of strabismus: (a) orthotropic eye; (b) exophoria or exotropia; (c) esophoria or esotropia; (d) epiphoria or esotropia; (e) hypophoria or hypotropia;

FIG. 9 is a flowchart of a diopter diagnosis method;

Figure 10 is a schematic diagram of imaging;

Among them, 1-pupil, 2-electronic grating assembly, 3-zoom control assembly, 4-optical target, 5-infrared filter, 6-infrared lamp board, 7-infrared camera, 8-infrared lamp, 9-fixation Lamp, 10-Lighting Controller, 11-Lighting, 12-Electromagnet, 13-Zoom Lens, 14-Guide, 16-Bracket, 17-Knob, 18-Base, 19-Forehead Rest, 20-Chin Rest, 21- Screw, 22-bevel gear.

Detailed ways

The utility model will be further described below with reference to the accompanying drawings and embodiments.

As shown in FIG. 1 , the diagnostic device for intelligently screening strabismus and diopter in this embodiment includes an optical system and a processing control unit, wherein the optical system includes a strabismus imaging optical path and a diopter imaging optical path, and the strabismus imaging optical path and the diopter imaging optical path share an infrared camera 7 And the light source, wherein, the infrared camera 7 and the light source are installed on an arc guide and the two move synchronously, the infrared camera 7 can be moved to the front of the eye for diopter detection or the light source is moved to the front of the eye for strabismus detection (infrared camera 7 The position of the light source and the light source are different, so the detection items are also different). The strabismus imaging optical path also includes an optotype 4, a grating and an optotype switching structure.

The grating and optotype switching structure and the infrared camera 7 are designed to be movable structures, which work together with the strabismus imaging optical path and the diopter imaging optical path to realize the clear imaging of the position of the infrared light reflection point on the pupil and the cornea of different diopters. In the strabismus inspection, it is necessary to ensure the connection between the two line-of-sight distances and the grating, and the optical zoom lens needs to meet the requirements of the system for different line-of-sight distances; in the diopter detection, it is necessary to first ensure that the imaging system and the human eye are connected to the pupil, that is, to meet the requirements of the system. The entrance pupil of the optical system and the pupil of the human eye are coaxial, and the optical working distance must be the design value.

The processing control unit includes an embedded SOC processor, a wireless communication module, a touch screen and a power supply, and realizes the functions of image shooting, control and storage. The embedded SOC processor is respectively connected with the wireless communication module, the touch screen, the power supply and the above-mentioned optical system. The embedded SOC processor has an internal integrated image processing unit, rich peripheral interfaces, small size and low power consumption, and is powered by a battery, which realizes the portability of the product.

Preferably, the image acquisition of the device adopts a dual optical system, that is, each of the left and right eyes is an independent image acquisition system, including a grating and an optotype switching structure, an optotype 4 , a light source and an infrared camera 7 . In other words, the diagnostic device for intelligently screening strabismus and diopter of the present embodiment is provided with a dual optical system, that is, one set of the above-mentioned optical systems is provided for each of the left and right eyes, including the above-mentioned grating and optotype switching structure, optotype 4. Light source and infrared camera 7.

As shown in Figures 2 and 3, the oblique imaging optical path specifically includes a grating and optotype switching structure, optotype 4, a light source and an infrared camera 7, wherein the grating and optotype switching structure includes an electronic grating assembly 2 and a zoom control assembly 3, wherein The electronic grating assembly 2 includes a grating controller 10 and a grating 11. The grating controller 10 is connected to the embedded SOC processor. The grating 11 can be occluded after being controlled by the grating controller 10 and powered on. During detection, the liquid crystal is reversed after the grating 11 is powered on. , the light cannot pass through and thus cover the eyes.

One for each of the left and right eyes of the electronic grating assembly 2 is to control the power-on or power-off of the gratings 11 of the left and right eyes by controlling the circuit of the grating controller 10 to realize alternate shielding.

The zoom control assembly 3 includes a zoom lens 13 and an electromagnet 12. The electromagnet 12 is connected to the zoom lens 13, and the electromagnet 12 is connected to the embedded SOC processor. The zoom lens 13 and the electromagnet 12 realize the line-of-sight simulation and switching functions. When the viewing distance is 33cm, the electromagnet 12 is not energized, and the zoom lens 13 is moved out of the oblique imaging optical path; when the system requires a viewing distance of 6m, the electromagnet 12 is energized, and the zoom lens 13 is moved into the oblique imaging optical path.

The light source includes an infrared lamp board 6 and an infrared filter 5, and the infrared lamp board 6 is provided with a fixation lamp 9 and a plurality of infrared lamps 8 around the fixed lamp 9, which can be effectively eliminated by the infrared ring segment and the infrared filter 5. The cornea reflects stray light, which can reduce the interference to the human eye.

As shown in FIG. 2 , the pupil 1 , the grating and the optotype switching structure, the optotype 4 and the light source are located on the same straight line and on the same horizontal line as the pupil 1 , and the infrared camera 7 is located below the pupil 1 . When doing strabismus detection, the light source (infrared light) and the pupil are required to be on the same horizontal line, so that the reflection point on the pupil mapped by the infrared light is in the center position, which is the benchmark for comparison and judgment of strabismus detection.

The zoom control assembly 3 can cooperate with the optotype 4 to achieve 33cm and simulated 6m viewing distance. When conducting strabismus screening, the electronic grating component 2 is controlled by the single-chip microcomputer to prevent the light from passing through, covering the eyes of the test subject, the fixation lamp 9 flickers to attract the eyes to face the optotype 4, and the zoom control component 3 cuts out the optical path to match the optotype. 4. The switching sight distance is 33cm, the infrared light 8 emits infrared light and is irradiated on the pupil 1 through the infrared filter 5, and the infrared camera 7 is located under the human eye to shoot and record the position change trajectory of the pupil 1 reflection point and save it as a video a; The electronic grating component 2 is controlled by the single-chip microcomputer and is powered on so that the light cannot pass through to cover the eyes. The fixation lamp 9 flickers to attract the eyes to face the optotype 4. The zoom control assembly 3 cuts into the optical path and cooperates with the optotype 4 to switch the viewing distance to 6m, and the infrared lamp 8 emits The infrared light is irradiated on the pupil 1 through the infrared filter 5, and the infrared camera 7 is under the human eye to shoot and record the position change trajectory of the reflection point of the pupil 1 and save it as video b; the embedded SOC processor receives the above video and decomposes it and saves it by frame. For the image information, the processor makes a strabismus diagnosis by comparing and analyzing the position change trajectory of the infrared light reflection point on the pupil in the image, and combining the strabismus type classification.

As shown in FIG. 4 , the diopter imaging optical path includes an infrared camera 7 , an infrared filter 5 , an infrared lamp board 6 , an infrared lamp 8 , a fixation lamp 9 and a guide rail 14 . The settings of the infrared filter 5, the infrared lamp board 6, the infrared lamp 8, and the fixation lamp 9 are consistent with those in the above-mentioned strabismus imaging optical path. When the diopter test needs to be performed, the infrared camera 7, the infrared filter 5 and the infrared lamp board 6 Move from A to B on the guide rail 14, the diopter detection requires the infrared camera 7 and the pupil 1 to be in the same horizontal position, the infrared lamp 8 illuminates the pupil 1, the infrared camera 7 takes a picture of the eye and saves it, through Analyze the offset of the light spot array formed by the light spot on the pupil in the picture relative to the calibration light, and calculate the diopter of the human eye.

As shown in FIG. 5 , the above-mentioned optical system is arranged on the head rest and base structure, which includes a bracket 16 , a knob 17 , a base 18 , a forehead rest 19 , a chin rest 20 , a screw 21 , and a bevel gear 22 . The bracket 16 and the base 18 are vertically arranged, wherein the knob 17, the chin rest 20, the screw 21 and the bevel gear 22 form a lifting mechanism arranged on the bracket 16, and the knob 17 is rotated to drive the screw 21 to rotate through the bevel gear 22. The holder 20 can be moved up and down.

The diagnostic device for intelligent screening of strabismus and diopter of the present embodiment performs strabismus diagnosis, and the method is as follows:

Alternate occlusion method and corneal mapping method are used to detect invisible strabismus and intermittent strabismus. The videos of the optotypes that the subjects were looking at under different covering modes and at a viewing distance of 33 cm and 6 m were respectively recorded, and each frame of the video was extracted. The distance and pupil position change information, the position information of the eye position and the movement direction of the eyeball are obtained for diagnosis, and the diagnosis result is obtained.

Specific test instructions: make the subject's right eye gaze at the optotype 4, the electronic grating assembly 2 is energized to cover the left eye, and then quickly open, and then cover the right eye, so that the left eye gazes at the optotype 4, alternately covering several times, video recording After extracting the image and analyzing the position change information of the reflective point on the pupil 1, combined with the covering mode, the viewing distance and the pupil position change information, it is determined whether the position of the covered eye has changed. If there is no movement of the eyes, it is an orthotropic eye; if there is a change in the position of the eye to cover the eye, it means strabismus. When the eye position moves back to the center, it is recessive strabismus. The eye position cannot return to the center after movement, which is dominant strabismus. Analysis of the movement direction of the eye position: if the eyeball moves from the outside to the center, it is exophoria or exotropia; if the eyeball moves from the inside to the center, it is esophoria or esotropia; if the eyeball moves from the top to the center, it is epiphoria or upper strabismus Strabismus; if the eyeball moves from the bottom to the center, it is hypophoria or hypotropia.

Using the device of this embodiment, the relative positional relationship between the position of the reflection point and the pupil center can also be collected, and the specific squint angle can be analyzed and diagnosed, thereby realizing the digital diagnosis of the squint angle.

The diagnostic device for intelligently screening strabismus and diopter of the present embodiment performs diopter diagnosis, and the method is as follows:

The light source emits infrared light, and the infrared light is triggered synchronously with the camera to obtain the grayscale image projected by the infrared light source on the retina of the test subject, analyze the image, and obtain the brightness information of the light spot on the retina in the image, according to the brightness of the light spot on the image. , position and area to calculate the diopter of the human eye, make a diagnosis, and obtain a diagnosis result.

The normal eye has no abnormal refraction, and the infrared light emitted by the light source is projected and focused on the retina; the anterior and posterior axis of the eyeball of myopic eyes is lengthened, the cornea becomes convex, and the light is focused in front of the retina; the human eye is photographed while the infrared light is emitting, and then The images are analyzed and the diopter is calculated. The distance from the infrared light source to the camera=r+2L, where r is the distance from the human eye to the light source.

The system builds face 3D model data through the images collected by the dual lens, and compares it with the images collected by the single lens to obtain accurate data of the distance from the human eye to the forehead plane and the interpupillary distance of the human eye, improving the calculation accuracy of the diopter.

The above descriptions are only preferred embodiments of the present invention, and do not constitute a limitation on the protection scope of the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present utility model shall be included within the protection scope of the claims of the present utility model.

Claims (6)

1. A diagnostic device for intelligently screening squint and diopter comprises an optical system and a processing control unit, and is characterized in that the optical system comprises a squint imaging optical path and a diopter imaging optical path, the squint imaging optical path and the diopter imaging optical path share an infrared camera and a light source, the light source comprises a light source body and a light filter arranged in front of the light source body, the infrared camera and the light source are arranged on an arc-shaped guide rail and move synchronously, the infrared camera moves to the front of eyes to perform diopter detection or the light source moves to the front of the eyes to perform squint detection, the squint imaging optical path further comprises a sighting target, a grating and a sighting target switching structure, the sighting target is uniquely and fixedly arranged between the grating and sighting target switching structure and the light source, the grating and sighting target switching structure can intelligently complete eye shielding and vision distance switching without additional manual operation;

the processing control unit comprises an SOC processor, a wireless communication module, a touch screen and a power supply, the SOC processor is respectively connected with the wireless communication module, the touch screen, the power supply and the optical system, and the SOC processor acquires and stores detection data and intelligently analyzes the data to obtain a diagnosis result.

2. The diagnostic apparatus for intelligently screening strabismus and diopter as claimed in claim 1, wherein said grating and sighting mark switching structure comprises an electronic grating assembly, the electronic grating assembly comprises a grating controller and a grating, the grating controller is connected with said SOC processor, the grating is controlled by the grating controller to be powered on, and then liquid crystal inversion occurs, so that light can not pass through and thus eyes can not be shielded.

3. The diagnostic apparatus for intelligently screening strabismus and diopter as claimed in claim 1 or 2, wherein said grating and sighting mark switching structure comprises a zoom control component, said zoom control component can implement 33cm and simulate 6m of sighting distance by matching with said sighting mark, said zoom control component comprises a zoom lens and an electromagnet which are connected with each other, said electromagnet is connected with said SOC processor, and said electromagnet can drive the zoom lens to move into or out of said strabismus imaging optical path by turning on or off, so as to implement sighting distance switching function.

4. A diagnostic device for intelligent screening of strabismus and diopters as defined in claim 3 wherein said device is provided with dual optical systems, one set for each of the left and right eyes.

5. The diagnostic apparatus for intelligently screening strabismus and diopter as claimed in claim 3, wherein said apparatus further comprises a head support and a base structure, comprising a support, a knob, a base, a forehead support, a chin support, a screw rod and a bevel gear, wherein the support and the base are vertically arranged, wherein the knob, the chin support, the screw rod and the bevel gear form a lifting mechanism arranged on the support, the knob is rotated to drive the screw rod to rotate through the bevel gear transmission, so that the chin support can move up and down.

6. The diagnostic device for intelligently screening strabismus and diopters as claimed in claim 3, wherein the light source body comprises a fixation lamp and a plurality of infrared lamps arranged around the fixation lamp, and the fixation lamp and the plurality of infrared lamps are arranged on the same lamp panel.

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