Rapid mesopic vision dark adaptation function inspection device

Abstract

The utility model discloses a rapid mesopic vision dark adaptation function inspection device, which mainly comprises an eyeshade, a mesopic vision field component, a dark sighting mark component, a front cover and a head-mounted device, and is characterized in that representative parameters such as the maximum brightness of 17 cd / m < 2 >, the wavelength of 540-550 nm and the like are scientifically set during inspection; according to the method, the dark adaptation time after mesopic vision field stimulation can be accurately obtained, so that effective evaluation on the mesopic vision dark adaptation function is realized.

Description

Technical Field

[0001] The utility model belongs to the technical field of photoelectricity and relates to a visual function inspection device. Background Art

[0002] Dark adaptation refers to the inability of the human eye to distinguish targets in a dark environment when it moves from an adapted bright light environment to a dark environment or when the lighting suddenly stops. It takes a while to adapt before the eye can see the surrounding scenery clearly. This is a physiological phenomenon of the human eye, which is determined by the sensitivity of the retinal cells to weak light and changes in the pupil of the human eye.

[0003] Mesopic vision is the vision produced by the combined action of the cones and rods of the retina when the human eye is exposed to brightness levels between the ranges of photopic and scotopic adaptation. This includes vision produced by drivers or pilots working visually at dawn or dusk while driving a car or train, or while flying, and by pilots performing visual operations while wearing low-light-level night vision devices during night flights. When a driver or pilot suddenly enters a darker environment at dawn or dusk, or when a driver using a car's night vision system or a pilot using a low-light-level night vision device needs to switch to naked vision, the human eye needs to adapt to this rapid change in brightness (known as mesopic dark adaptation), a key factor affecting visual operational performance.

[0004] While both cones and rods contribute to observation in the human eye's mesopic state, the function of both cells is suboptimal. Furthermore, when ambient brightness decreases rapidly (e.g., when entering a tunnel or removing a low-light-level night vision device), the human eye generally struggles to adapt quickly, which can easily lead to various accidents caused by limited observation. Therefore, the evaluation of dark adaptation ability should fully consider the dark adaptation function of mesopic vision. By examining the physiological limitations of the human eye in mesopic brightness environments, we can more comprehensively and accurately assess the differences in visual physiology between people. This also provides an objective and scientific basis for selecting personnel with better visual function (for example, pilots rely on vision for 80% of their spatial orientation information during flight).

[0005] In the past, the evaluation of light perception in human visual function mainly used dark adaptation test methods, including classic dark adaptation threshold test (i.e. 5 minutes of light adaptation and 30 minutes of dark adaptation test) and faster dark adaptation test method (i.e. 2 minutes of light adaptation followed by 1 minute of dark adaptation test). These methods focus on the human eye from the photopic state (≥100 lx is bright field, 1lx = 1 cd / m 2) can quickly switch to the contrast resolution under the dark vision state, and the ability of retinal photosensitive cells to adapt to the corresponding low light intensity environment is used as an important reference for medical selection or clinical ophthalmology evaluation of retinal and optic nerve function. In recent years, although serious driving and flight safety accidents that may be caused by the mesopic state have attracted widespread attention, the evaluation of the dark adaptation function under the mesopic state has become more urgent and important. However, due to the wide range of ambient light intensities that cause mesopic vision and the lack of defined environmental simulation parameters with clear application significance (for example, which brightness should be considered to be representative of the mesopic problem), the evaluation of the dark adaptation function of mesopic vision has not been effectively carried out.

[0006] At present, the commonly used equipment for dark adaptation examination in clinical practice is the French Myvi visual function tester. This tester is based on the fact that the turning point of the two parts of the dark adaptation curve is at 6 to 8 minutes, and after the turning point is the dark adaptation reaction of the rod cells, so 15 minutes after dark adaptation is set as the end point of the dark adaptation function test. However, the dark adaptation test target of this tester is a pure white light spot target, and the examination process is easily affected by the retinal visual afterimage, resulting in some patients who complain of decreased night vision in clinical practice still having normal results in this examination. In the Chinese patent CN113208555A, the subjects' responses to the dark target (display brightness adjusted to 10 -3 , 10 -4 cd / m 2 ) to accurately identify the time of night vision, thereby evaluating the dark adaptation ability of rod cells, which is closely related to night vision. However, this patent only tests the dark adaptation function of light vision and does not cover the dark adaptation function of the human eye in the mesopic state. The test results are not suitable for evaluating the dark adaptation function of mesopic vision. Summary of the Invention

[0007] The purpose of the present utility model is to provide a device for quickly testing the dark adaptation function of intermediate vision. By simulating ambient light according to parameters such as brightness that are representative of application and can induce intermediate vision, and considering physiological factors such as the sensitivity of the human retina to different light sources for device structure and operation design, the standardized inspection and effective evaluation of the dark adaptation function of the human eye's intermediate vision in ophthalmic medical selection and identification can be achieved.

[0008] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0009] The inspection device includes an intermediate vision field assembly and a dark sight mark assembly; the intermediate vision field assembly includes an intermediate vision field housing and a light source arranged in the intermediate vision field housing for enabling the subject to form intermediate vision; the dark sight mark assembly includes a sight mark box connected to the intermediate vision field housing, and a brightness switching module and a sight mark module arranged in the sight mark box; the sight mark module includes a dark sight mark display area, which is opposite to a dark sight mark observation hole arranged on the sight mark box; the brightness switching module includes a filter for reducing the brightness of the dark sight mark and a motor for driving the filter to slide horizontally between the dark sight mark observation hole and the dark sight mark display area.

[0010] Preferably, the light source comprises a plurality of modulatable light emitting modules for generating simulated ambient light in the intermediate visual field housing.

[0011] Preferably, the parameter of the simulated ambient light is brightness ≤ 17 cd / m 2 , wavelength 540~550 nm.

[0012] Preferably, an observation window is provided at one end of the intermediate visual field shell, and the other end of the intermediate visual field shell is connected to the sight mark box, and the dark sight mark observation hole is located on the side of the sight mark box opposite to the observation window, and a reflective coating is provided on the side of the side facing the observation window and the inner surface of the intermediate visual field shell.

[0013] Preferably, a corrective lens insert is provided in the observation window.

[0014] Preferably, a light-shielding eye mask connected to the intermediate visual field housing is provided outside the observation window.

[0015] Preferably, the brightness switching module also includes a motor mounting frame, parallel threaded rods and guide rails arranged on the motor mounting frame, and a moving block respectively matched with the guide rails and threaded rods, the threaded rods being connected to the main shaft of the motor, a moving light frame being provided on the moving block, and a light shielding plate (the color of the light shielding plate is the same as the color of the reflective coating) being provided on one side of the moving light frame in a horizontal direction, and the filter being provided on the other side of the moving light frame.

[0016] Preferably, the brightness of the dark spot is >10 -3 cd / m 2 After passing through the filter, the brightness of the dark target is reduced to <10 -3 cd / m 2 .

[0017] Preferably, the dark sight mark assembly further includes a camera for monitoring the eyes of the subject, and the camera is arranged in the sight mark box.

[0018] Preferably, the inspection device further comprises a head-mounted device connected to the intermediate visual field housing.

[0019] Preferably, the inspection device further comprises a host computer connected to the intermediate vision field component and / or the dark vision mark component.

[0020] The beneficial effects of the present invention are as follows:

[0021] The utility model utilizes a horizontally sliding filter driven by a motor to reduce the brightness of the dark vision mark, thereby avoiding repeated reduction of the dark vision mark brightness during the test phase. The dark adaptation time after the stimulation of the intermediate vision field can be obtained more accurately, thereby realizing an effective evaluation of the dark adaptation function of the intermediate vision.

[0022] Furthermore, by providing a light shielding plate and a filter separated therefrom, the need for dark-vision mark identification during inspection is met, and the accuracy of the inspection result is improved.

[0023] Furthermore, by scientifically setting representative parameters (maximum brightness 17 cd / m 2 , wavelength 540-550nm), providing a new way to test visual function (specifically, tests related to intermediate vision). BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 To check the overall structure diagram of the terminal;

[0025] Figure 2 To check the terminal assembly diagram;

[0026] Figure 3 for Figure 2 A schematic structural diagram of the intermediate visual field assembly is shown;

[0027] Figure 4 for Figure 2 A schematic structural diagram of the brightness switching module of the dark viewing mark component shown;

[0028] Figure 5 for Figure 2 A structural diagram of the sight mark module of the dark sight mark assembly shown;

[0029] Figure 6 Frequency distribution of the dark adaptation test results of mesopic vision for 100 subjects: mean = 67.86, standard deviation = 39.855;

[0030] In the figure: 1-headband, 2-light-shielding eye mask, 3-intermediate visual field assembly, 4-dark sight mark assembly, 5-front cover; 30-intermediate visual field housing, 31-light source plane, 32-correction lens plug, 33-LED lamp; 40-sight mark box, 41-camera, 42-connector, 43-brightness switching module, 44-sight mark module; 430-absorptive neutral density filter, 431-stepper motor mounting bracket, 432-stepper motor, 433-moving light frame, 434-moving block, 435-guide rail, 436-light-shielding whiteboard; 440-drive board, 441-display screen, 442-dimout film, 443-narrowband filter, 444-mounting plate, 445-mounting plate through hole. DETAILED DESCRIPTION

[0031] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments, which are intended only to explain the present invention and are not intended to limit the scope of protection of the present invention.

[0032] (1) Structural design of the terminal for testing the dark adaptation function of intermediate vision

[0033] like Figure 1 and Figure 2 As shown, the intermediate vision dark adaptation function test terminal mainly consists of a sponge-made light-shielding eye mask 2, an intermediate vision field component 3, a dark vision mark component 4, a front cover 5 and a headband 1. The headband 1 includes a horizontal plane strap and a sagittal plane strap. The two ends of the horizontal plane strap are respectively bound by fixed buckles located on the left and right sides of the intermediate vision field component 3. The main body of the sagittal plane strap is located on the upper side of the horizontal plane strap, and one end of the sagittal plane strap is bound by a fixed buckle located on the top of the side where the intermediate vision field component 3 and the dark vision mark component 4 are connected (i.e., the front side of the intermediate vision field component 3). The other end of the sagittal plane strap is fastened to the middle part of the horizontal plane strap by gluing or sewing, so that After the subject wears the mesopic dark adaptation function test terminal via the headband 1, their eyes can be aligned with the observation window located on the rear side of the mesopic field of view assembly 3. The horizontal and sagittal straps are self-adhesive or attached with Velcro, allowing for quick adjustment of the tightness of the mesopic dark adaptation function test terminal after connection with the corresponding fixed buckles. This allows the sponge eye mask 2, attached to the outside of the observation window, to closely contact the subject's eyes (specifically, the outer side of the eye sockets). The front side of the scotopic marker assembly 4 faces the observation window, displaying a scotopic marker for the subject to identify at a certain depth of field of view. The front cover 5 is mounted on the rear side of the scotopic marker assembly 4 (opposite to the side where the scotopic marker provided by the scotopic marker assembly 4 is visible), making the scotopic marker assembly 4 easily accessible for maintenance.

[0034] like Figure 2As shown, the dark sight mark assembly 4 specifically includes a sight mark box 40 (opaque), a brightness switching module 43, a sight mark module 44, a camera 41, and a connector 42. The sight mark module 44 and the camera 41 (the latter with a mounting socket) are respectively installed in the sight mark box 40 on a side opposite to the intermediate visual field assembly 3 and away from the front cover 5. The brightness switching module 43 is installed at the bottom of the sight mark box 40. The host interface of the connector 42 is fixed to the sight mark box 40. The lead terminal of the connector 42 is connected to the sight mark box 40 through a cable ( Figure 2 The sight mark box 40 is connected to the drive circuit integrated into the sight mark module 44 (not shown). The sight mark box 40 is closed on the side opposite the intermediate visual field assembly 3 and away from the front cover 5. This closed side is provided with only a dark sight mark observation hole directly opposite the observation window and an eye movement (specifically, blinking or closing the subject's eyes) monitoring hole directly opposite the camera 41. The sight mark box 40 has mounting holes at the top, bottom, and four corners of this closed side for connecting and securing it to the intermediate visual field assembly 3 (the open side of the sight mark box 40 is used for fitting and mounting the front cover 5).

[0035] like Figure 3As shown, the intermediate vision field assembly 3 specifically comprises an intermediate vision field housing 30 (with the observation window and securing buckle), a corrective lens insert 32, and an intermediate vision field light source. The intermediate vision field housing 30 is made of polymer materials using additive printing technology, resulting in an ergonomic design that allows the observation window to fit the eyes of most subjects before the examination begins. The corrective lens insert 32 is installed within the observation window, facilitating the placement of spectacle lenses (e.g., optical corrective lenses, which prevent subjects from seeing dark sight marks due to myopia or hyperopia, thus helping to eliminate errors in the examination results). A finishing layer is formed by spraying barium sulfate throughout the interior of the intermediate vision field housing 30 to enhance the reflective uniformity of the intermediate vision field light source (giving the inner surface of the intermediate vision field housing 30 a white appearance; the sight mark box 40, facing the intermediate vision field assembly 3 and away from the front cover 5, is also sprayed with barium sulfate). The exterior of the intermediate vision field housing 30 (i.e., the outer surface where the fixing buckle is located) is sprayed with a matte black polyurethane enamel to prevent the impact of external light reflections on the inspection. The intermediate vision field light source primarily comprises four modulated (brightness, spectral peak) light modules (e.g., LEDs 33) mounted at the four corners of a plane (referred to as the light source plane 31) within the intermediate vision field housing 30, located further forward than the observation window (i.e., farther from the subject's eyes). During the inspection, the light source within the intermediate vision field housing 30 can be used to simulate ambient light conditions that induce intermediate vision in the subject. After the subject's eyes remain in the intermediate vision state induced by the simulated ambient light for a certain period of time, the host computer can shut off the intermediate vision field light source and utilize the relevant modules of the dark-vision target assembly 4 to complete the inspection of the subject's dark adaptation function.

[0036] like Figure 4 As shown, the brightness switching module 43 specifically includes a movable optical frame 433, an absorptive neutral density filter 430, a stepper motor mounting frame 431, a guide rail 435, a moving block 434, and a stepper motor 432. The stepper motor mounting frame 431 is fixed in the sight mark box 40, and the stepper motor 432 is fixed to one side of the stepper motor mounting frame 431. The guide rail 435 is fixed to the stepper motor mounting frame 431, and a threaded rod ( Figure 4(The optical rod represents its installation position, and the surface thread is not shown). The threaded rod is connected to the main shaft of the stepper motor 432. The moving block 434 is assembled on the slide rail 435 and the threaded rod at the same time, wherein the slide rail 435 and the moving block 434 can slide relative to each other, and the threaded rod cooperates with the threaded hole that passes through the moving block 434. The moving light frame 433 is fixed on the top of the moving block 434. The upper part of the moving light frame 433 is provided with three plate holes of the same shape and size (or similar) and closely arranged in the shape of an "I". The plate hole in the middle is in an empty state (it has no effect on the light passing through, for example, it does not change the brightness level of the dark vision mark). A light-shielding white plate 436 is installed on the other plate hole on the side of the plate hole away from the fixed position of the stepper motor 432. The absorptive neutral density filter 430 is installed on the third plate hole closest to the fixed position of the stepper motor 432. During the inspection, as the stepper motor 432 runs (for example, passing through The moving block 434 is moved in a straight line in batches and successively, and the light frame 433 is moved so that the plate hole in the middle which is in an empty state and the absorptive neutral density filter 430 located at the rear side thereof successively replace the light-shielding white plate 436 located at the front side thereof and stay at a position directly opposite to the observation hole of the dark vision mark (when the light-shielding white plate 436 is in this position, the subject's direct visual field under the intermediate vision will be white, avoiding the subject from predetermining the precise position where the dark vision mark will appear, thereby improving the accuracy of the test result; and when the absorptive neutral density filter 430 is in this position, the brightness level of the dark vision mark can be reduced).

[0037] The stepper motor 432 can be a two-phase integrated winding stepper motor (1.8° step angle, 0.5 kg∙cm static torque), with an operating voltage of 10-30 V DC and a rated current of 1 A. The absorptive neutral density filter 430 can be selected from filters of different optical densities (i.e., different attenuation coefficients), thereby changing the transmittance of the corresponding light emitted by the component used to generate the dark sight mark in the sight mark module 44 to achieve a lower brightness level, such as 10 -4 cd / m 2 Wait for the dark vision target to switch.

[0038] like Figure 5As shown, the visual target module 44 specifically includes a display screen 441, a driver board 440, a dimming filter 442, a narrowband filter 443, and a mounting plate 444. The display screen 441 is mounted on the front of the driver board 440 and connected to the integrated drive circuit on the back of the driver board 440 (the control units of the camera 41 and the stepper motor 432 are connected to the integrated drive circuit via cables). The dimming filter 442 and the narrowband filter 443 are stacked on the display screen 441 from the inside out. The driver board 440 is secured to the visual target box 40 via the mounting plate 444. A gap is left between the driver board 440 and the mounting plate 444 to facilitate movement of the upper portion of the movable optical frame 433 (i.e., the portion where the absorptive neutral density filter 430 and the light-shielding white plate 436 are mounted) between the driver board 440 and the mounting plate 444 (specifically, directly in front of the display screen 441), facilitating the miniaturization and compactness of the dark visual target assembly 4. In order to prevent the mounting plate 444 from blocking the above-mentioned dark vision mark observation hole (causing the subject to be unable to identify the dark vision mark through binocular observation), a mounting plate through hole 445 is opened on the mounting plate 444 (the mounting plate through hole 445 is respectively opposite to the dark vision mark observation hole and the narrow-band filter 443 located on both sides thereof, and the area of ​​the mounting plate through hole 445 should not be less than the area of ​​the dark vision mark observation hole, so as to avoid as much as possible the possible position of the dark vision mark observation hole that the subject finds when the intermediate visual field light source is working, thereby ensuring the actual effect of the inspection).

[0039] The display screen 441 adopts a 0.77-inch micro high-resolution AMOLED screen with a resolution of 1280×1024, a pixel pitch of 12 µm, a display area of ​​15.36 mm×12.29 mm, an RGB vertical strip pixel arrangement, 8 bits / 256 grayscale levels, and a brightness of ≥150 cd / m 2 , uniformity> 85%, with the characteristics of self-luminescence, wide viewing angle and low power consumption; the narrow-band filter 443 adopts a narrow-band filter with a central wavelength of 512 nm, a half-bandwidth of 25 nm, a size of 17.5 mm × 17.5 mm, a thickness of 1.1 mm, and a peak pass rate of 60% to 70%; after passing through the above-mentioned dimming film 442 and narrow-band filter 443, a blue-green dark visual mark with a brightness level lower than the brightness level of the AMOLED screen itself can be formed in the display area (for example, the brightness is 10 -2 cd / m 2 ) and provided for the subjects to identify.

[0040] (2) Usage and parameter optimization of the terminal for testing the dark adaptation function of mesopic vision

[0041] ① Inspection process of the intermediate vision dark adaptation function inspection terminal

[0042] It mainly includes an intermediate visual adaptation stage (the intermediate visual field light source and the display screen 441 are both turned on, and the dark vision mark formed in the latter's display area is blocked from observation by the light-shielding white board 436), a dark adaptation stage (only the display screen 441 is turned on, and the dark vision mark formed in its display area is recognized by the subject through binocular observation), and a test stage (only the display screen 441 is turned on, and the dark vision mark formed in its display area is reduced in brightness by the absorption neutral density filter 430, and the time it takes the subject to observe and recognize the dark vision mark is recorded, that is, the inspection time).

[0043] Among them, during the intermediate visual adaptation stage, the host uses the subject's eye image captured by the camera 41 to automatically analyze the subject's eye opening / closing status, and reminds the subject to open his eyes through voice output, thereby reducing the false negatives in the test results caused by the subject's conscious or unconscious eye closing during the intermediate visual adaptation process (preventing the human eye from entering the dark adaptation process prematurely, resulting in shortened inspection time and improved evaluation results during the test phase).

[0044] ② Use any of the four directional arrows "↑", "→", "↓" and "←" as the shape of the dark mark (displayed synchronously on the host), and randomly switch from the arrow in the current direction to the arrow in other directions as the brightness of the dark mark decreases, thereby reducing the false negatives of the inspection based on the dark mark.

[0045] ③ Since the focus of the examination is the dark adaptation ability under the mixed action of cones and rods (with rods as the main factor). And the experiment shows that 10 -2 cd / m 2 , 10 -4 cd / m 2 (The latter is a reduced brightness that only stimulates rod cells but not cone cells) as the brightness parameter of the dark vision mark after the light source of the intermediate visual field is turned off, which can ensure the accuracy of the rod cell function test. -3 cd / m 2 Brightness (e.g. 10 -4 cd / m 2 ) is used as the brightness of the dark vision target for testing.

[0046] ④ The human eye is at 10 -3 cd / m 2 to 10 2 cd / m 2The brightness range is the intermediate vision state, at this time, both cones and rods work, and it is necessary to determine the time (the shorter the time, the better) that the human eye can recognize (i.e. see clearly) the target after the ambient brightness suddenly drops to an extremely low level (much lower than the ambient brightness of the dark vision target used in the examination) in this state. Representative parameters need to be selected. At the same time, visual physiology is combined, namely the Parkinson shift phenomenon that exists in the human eye when the ambient brightness drops, the color gamut change of rod cells in the low brightness environment (rod cells tend to respond to stimuli with shorter wavelengths), and the different spectral responses of cones and rods. Finally, experiments have proved that it is better to select a brightness environment that is higher in the working threshold of rod cells (for example, a brightness of 17 cd / m 2 , green light with a wavelength of 540-550 nm) for intermediate vision adaptation, which not only scientifically simulates the ambient light that forms intermediate vision, but is also more meaningful for understanding the function of rod cells and has universal representativeness.

[0047] (3) Verification of the effectiveness of dark adaptation function test of mesopic vision

[0048] Instruments were used to evaluate the dark adaptation function of intermediate vision in healthy people with normal visual function, and normal reference values ​​were calculated to provide a scientific basis for the selection and identification of the dark adaptation ability of intermediate vision of the human eye under the mixed action of cones and rods in ophthalmology.

[0049] 3.1 Overview of the Experimental Process

[0050] One hundred healthy individuals (78 males and 22 females) aged 25.8 ± 5.1 years (range, 20-43 years) were randomly selected for dark adaptation testing to green light stimulation. All subjects underwent slit-lamp microscopy and direct ophthalmoscopy to exclude organic ophthalmic disease. This study was approved by the Ethics Committee of Xijing Hospital, Air Force Medical University. All participants were informed of all experimental procedures and signed informed consent before the start of the experiment.

[0051] According to the inspection process of the terminal of the middle vision dark adaptation function, the brightness of 17 cd / m 2 and green light with a wavelength of 540-550 nm for intermediate vision adaptation (adaptation for 120 seconds), using 10 -4 cd / m 2 The brightness of the target is used as the brightness of the dark target in the test phase.

[0052] All data were analyzed using SPSS 23.0 software. The data were expressed as mean ± standard deviation, and P < 0.05 was considered statistically significant.

[0053] 3.2 Experimental Results and Conclusions

[0054] The average dark adaptation time for mesopic vision (green light) of the 100 subjects was 67.9 ± 39.9 seconds. The majority of subjects had a dark adaptation time of 20 to 40 seconds, accounting for 26% (Table 1). The Shapiro-Wilk test showed that the data on dark adaptation time for mesopic vision (green light) did not follow a normal distribution (P = 0.000). The frequency distribution was as follows: Figure 6 The calculated reference value of dark adaptation time for mesopic vision (green light) is no more than 157.7s (P0-P95).

[0055] Table 1. Results of dark adaptation test of intermediate vision (green light) of 100 subjects

[0056]

[0057] Note: The mark “*” in the numerical range indicates the value without the mark.

[0058] According to the above results, it can be concluded that in the dark adaptation function test of mesopic vision, the brightness of 17 cd / m 2 , wavelength of 540 ~ 550 nm as the simulated ambient light for forming intermediate vision, can provide necessary means and clear standards for the selection and identification of pilots using low-light-level night vision devices, and also provide necessary means and clear standards for evaluating the dark adaptation ability of car and truck drivers at dusk or dawn, as well as providing necessary means and clear standards for evaluating the driving ability of car drivers using night vision systems.

Claims

1. A device for testing dark adaptation function of mesopic vision, characterized by: The inspection device comprises an intermediate visual field assembly (3) and a dark sight mark assembly (4); the intermediate visual field assembly (3) comprises an intermediate visual field housing (30) and a light source for forming intermediate vision arranged in the intermediate visual field housing (30); the dark sight mark assembly (4) comprises a sight mark box (40) and a brightness switching module (43) and a sight mark module (44) arranged in the sight mark box (40); the sight mark module (44) comprises a dark sight mark display area, the dark sight mark display area being opposite to a dark sight mark observation hole arranged on the sight mark box (40); the brightness switching module (43) comprises a filter for reducing the brightness of the dark sight mark and a motor for driving the filter to slide horizontally between the dark sight mark observation hole and the dark sight mark display area.

2. The device for testing dark adaptation function of mesopic vision according to claim 1, characterized in that: The light source comprises a plurality of modulatable light emitting modules for generating simulated ambient light in an intermediate visual field housing (30).

3. The device for testing dark adaptation function of mesopic vision according to claim 1, characterized in that: One end of the intermediate visual field housing (30) is provided with an observation window, and the other end is connected to the sight mark box (40), the dark sight mark observation hole is located on the side of the sight mark box (40) opposite to the observation window, and a reflective coating is provided on the side of the side facing the observation window and on the inner surface of the intermediate visual field housing (30).

4. The device for testing dark adaptation function of mesopic vision according to claim 3, characterized in that: A corrective lens insert (32) is provided in the observation window.

5. The device for testing dark adaptation function of mesopic vision according to claim 3, characterized in that: A light-shielding eye mask (2) connected to the intermediate visual field housing (30) is provided outside the observation window.

6. The device for testing dark adaptation function of mesopic vision according to claim 1, characterized in that: The brightness switching module (43) further comprises a motor mounting frame, a parallel threaded rod and a guide rail (435) arranged on the motor mounting frame, and a moving block (434) cooperating with the guide rail (435) and the threaded rod, wherein the threaded rod is connected to the main shaft of the motor, and a moving light frame (433) is arranged on the moving block (434), and a light shielding plate is arranged on one side of the moving light frame (433) in a horizontal direction on the moving light frame (433), and the filter is arranged on the other side of the moving light frame (433).

7. The device for testing dark adaptation function of mesopic vision according to claim 1, characterized in that: The dark sight mark assembly (4) further comprises a camera (41) for monitoring the eyes of the subject, and the camera (41) is arranged in the sight mark box (40).

8. The device for testing dark adaptation function of mesopic vision according to claim 1, characterized in that: The inspection device further comprises a headband (1) connected to the intermediate visual field housing (30).

9. The device for testing dark adaptation function of mesopic vision according to claim 1, characterized in that: The inspection device further comprises a host computer connected to the intermediate visual field component (3) and / or the dark visual mark component (4).

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