A dynamic instantaneous vision continuous measurement system with variable test conditions

Abstract

A dynamic instantaneous visual acuity continuous measurement system with variable test conditions can simulate different external environments of daily work and life by changing test conditions such as visual mark contrast, blinking state, glare light source state, gaze direction, and test distance, and then perform multiple uninterrupted continuous measurements of dynamic instantaneous visual acuity over a period of time under specific test conditions. Using this system, clinically, it is possible to perform uninterrupted continuous measurements of the visual acuity of subjects with visual interference symptoms under different environmental conditions, such as visual fluctuations of dry eye patients, near-distance visual acuity of presbyopic patients, long-distance and near-distance visual acuity after multifocal intraocular lens implantation, preoperative and postoperative visual acuity changes of cataract patients, glare visual interference of cataract patients, binocular vision of strabismus patients in different gaze directions, and other clinical diseases to evaluate and analyze visual functions.

Description

Technical Field

[0001] The invention relates to the technical field of vision detection, and in particular to a dynamic instantaneous vision continuous measurement system with variable test conditions. Background Art

[0002] Vision testing is the most basic and important means to understand the visual function of the human eye. The standard clinical vision testing process is based on a fixed-design high-contrast (black spots on a white background) vision chart, which manually measures and records the visual targets that can be distinguished by the human eye to obtain the visual threshold, that is, the best corrected visual acuity. Traditional vision charts can be in a variety of forms, including printed, light box, projected, and LCD screen display. Among them, the printed and LCD screen display types can print or display visual targets of different contrasts, measure visual acuity under different contrasts, and obtain more visual function information. Regardless of the above-mentioned visual target display form, during the vision measurement process, the visual targets that the human eye looks at are all static visual targets, and the visual acuity obtained is the instantaneous visual acuity result under static conditions. In addition, the test conditions and environment are relatively fixed, so it can only reflect the instantaneous visual threshold under fixed test conditions, and the evaluation content of the real visual function of the human eye is limited. However, in daily work and life, the visual function of the human eye is dynamic and continuous, that is, there are fluctuations in vision over a period of time. At the same time, the visual function of the human eye will also be affected by different environmental conditions, such as the distance and contrast of objects, the blinking frequency of the human eye, the conditions of the ambient light source, the gaze direction of the human eye, etc. Therefore, a vision measurement system that can change the test conditions is clinically needed. At the same time, its measurement process should be dynamic and continuous, so as to conduct a more comprehensive and quantitative measurement and analysis of the real visual function of the human eye. Summary of the invention

[0003] In order to solve the defects of existing vision detection technology, the present invention provides a dynamic instantaneous vision continuous measurement system with variable test conditions, which can perform dynamic measurement of continuous instantaneous vision over a period of time. By changing the contrast of the sight mark, the blinking state, the glare light source state, the gaze direction, the test distance and other conditions, the vision of the human eye in daily work and life can be simulated, and the visual function of the human eye can be measured and analyzed more comprehensively and quantitatively.

[0004] The technical solution adopted by the present invention is: a dynamic instantaneous vision continuous measurement system with variable test conditions, including a display module, an optical lens module is also arranged between the display module and the human eye, a data processing module is connected to the display module, and a feedback module is also connected to the data processing module. The dynamic instantaneous vision continuous measurement device also includes a first position driving component, the first position driving component is an arc-shaped slide bar that can rotate 360° along the center, the display module also includes a slider structure, the display module can be rotated relative to the slider structure, so that the display module always faces the human eye and remains horizontal, the display module is connected to the first position driving component in the form of a slide bar slider, the first position driving component can make the display module move along the slide bar in all directions so as to be located in any different gaze direction, and the curvature of the first position driving component makes the test distance of the display module in all gaze directions relatively consistent when used at close range.

[0005] The display module is a display screen, and the display of sight marks with different contrasts can be achieved by adjusting the display brightness ratio of the background and the sight mark.

[0006] The optical lens module is connected to the display module via a second position driving component.

[0007] The optical lens module and the second position driving assembly are connected by magnetic attraction.

[0008] The second position driving component is a retractable bracket formed by a plurality of hollow tubes which are nested and assembled with each other. When extended, the tubes are nested and locked, and the length is fixed.

[0009] The second position driving assembly fixes the positions of the optical lens module and the display module so as to achieve a fixed sight mark magnification.

[0010] The refractive power of the optical lens is F, and the fixed distance between the optical lens module and the display module, that is, the object distance is l , the image distance of the visual mark displayed by the display module after being imaged by the optical lens is l’ .

[0011] The magnification of the visual mark imaged by the display module through the optical lens module is M = 1 / (F* l +1).

[0012] The second position driving assembly can be retracted and stowed, and the optical lens module can be removed at this time.

[0013] When the optical lens module is removed, the dynamic instantaneous vision of one eye or two eyes can be measured. The distance between the human eye and the display module is the test distance. The test distance of vision is 1 meter to 6 meters. The display module displays a series of sight marks corresponding to the test distance.

[0014] When the optical lens module 2 is used in combination with the display module 1, the limitation of the display screen resolution of the display module can be overcome, and dynamic instantaneous vision can be measured at a shorter test distance.

[0015] When the optical lens module 2 is combined with the display module 1, the dynamic instantaneous vision of a single eye can be measured. The distance between the human eye and the optical lens plus the image distance l’ That is the test distance. The test distance for vision is 0.4m to 1m, and the display module displays a series of sight marks of M times the size of the corresponding test distance.

[0016] The dynamic instantaneous vision continuous measurement device also includes an ambient light source module, which is arranged around the display module and the optical lens to simulate the influence of glare on dynamic instantaneous vision.

[0017] The dynamic instantaneous vision continuous measurement device also includes a video acquisition module, which records the blinking state of the human eye in real time.

[0018] The feedback module is a transponder with four direction buttons: up, down, left and right.

[0019] The data processing module includes:

[0020] Control unit, when measuring the average reaction time: control the display module to display 1-2 lines of sight marks above the subject's best corrected vision to ensure that the subject can recognize the currently displayed sight mark, the display module randomly displays sight marks in four different directions: up, down, left, and right, and the size of the sight mark remains unchanged. The subject uses the responder of the feedback module to press a button to respond, and the next sight mark is randomly displayed after the response. Repeat the above operation 30 times, record the subject's reaction time from the display of the sight mark to the key response each time, and calculate the average reaction time t of 30 responses. ave When the dynamic instantaneous visual acuity is continuously measured: after obtaining t ave After that, the visual mark on the control display module starts to display from the smallest visual mark that cannot be distinguished by the human eye. The initial visual acuity corresponding to the visual mark size at this time is recorded as VA1. The visual acuity is expressed in decimal form. The time point at this time is recorded as t s , the size of the sight mark increases gradually by α log units each time, the display duration of each size of the sight mark is β, and the visual acuity corresponding to the mth size of the sight mark is VA m , m is greater than or equal to 2, and the direction of the sight mark remains unchanged during the increase process until the feedback unit obtains a key signal result that matches the direction of the sight mark displayed at this time, and the time point when the key is pressed correctly is recorded as t e , reaction response time t r is the interval between the correct response time and the initial display time of the sight mark, that is, t r =te -t s , t r The data is sent to the storage unit for recording, and then the direction of the sight mark is randomly changed and the above operation is continued for n times. During the continuous measurement process, n t r , n is greater than or equal to 2, the total test duration is T, and the test stops when the total duration T is reached. The value of T can be 10 seconds to 10 minutes;

[0021] A feedback unit receives the key signal transmitted by the feedback module and transmits it to the control unit;

[0022] The calculation unit calculates the visual acuity value corresponding to the sight mark size.

[0023] The visual acuity corresponding to the size of the mth displayed sight mark is VA m :

[0024] logMAR(VA m ) = -log 10 (VA m-1 ) + α = -log 10 (VA1) + (m-1)*α

[0025] VA m = 10 -logMAR(VAm)

[0026] t r The visual acuity corresponding to the size of the sight mark displayed at the time point is VA tr :

[0027] logMAR(VA tr ) = -log 10 (VA1) + INT(t r / β) *α

[0028] VA tr = 10 -logMAR(VAtr)

[0029] The dynamic instantaneous visual acuity value VA obtained in each measurement dy :

[0030] logMAR(VA dy ) = -log 10 (VA1) + INT((t r -t ave ) / β) *α

[0031] VA dy = 10 -logMAR(VAdy)

[0032] Storage unit, storing n response times t transmitted by the control unit r, initial visual acuity VA1, average reaction time t ave , n calculated dynamic instantaneous visual acuity values ​​VA dy ;

[0033] Output unit, outputs n reaction response times t stored by the storage control unit r , initial visual acuity VA1, average reaction time t ave , n calculated dynamic instantaneous visual acuity values ​​VA dy After the test is completed, the output is based on T, t r With VA dy Continuous dynamic instantaneous visual acuity curve and parameters, with blink time points marked on the curve.

[0034] The ambient light source module is two LED lamps that provide glare light sources. The brightness of the light sources is adjustable so that the illumination reaching the human eye is variable from 0 to 300 Lux.

[0035] The glare light source uses the LED lamps around the display module when the optical lens module is removed.

[0036] The glare light source uses the LED lamp on the periphery of the optical lens when the optical lens module is used in combination with the display module.

[0037] The video acquisition module is arranged above the display module to record the blinking state of human eyes in real time, capture the blinking time point and calculate the blinking frequency.

[0038] The beneficial effects of the present invention are as follows: the present invention provides a dynamic instantaneous vision continuous measurement system with variable test conditions, which can simulate different daily work and life external environments by changing test conditions such as sight mark contrast, blinking state, glare light source state, gaze direction, and test distance, and then perform multiple uninterrupted continuous measurements of dynamic instantaneous vision within a period of time under specific test conditions. After the measurement is completed, the reaction response time t r , dynamic instantaneous visual acuity value VA dy Parameters such as time T, t r and VA dyThe continuous dynamic instantaneous visual acuity curve is marked with blinking time points on the curve. The various parameters and curves can be used to simulate the visual fluctuations of the human eye in different external environments of daily work and life, quantify and analyze the continuous impact of different environmental conditions on vision, and conduct more comprehensive and quantitative measurement and analysis of the visual function of the human eye. Using this system, in clinical practice, the vision of subjects with visual interference symptoms can be continuously measured under different environmental conditions, such as the visual fluctuations of dry eye patients, the near vision of presbyopic patients, the long-distance and near-distance vision after multifocal intraocular lens implantation, the changes in vision of cataract patients before and after surgery, the visual interference of glare in cataract patients, and the binocular vision of strabismus patients in different gaze directions. The visual function of clinical diseases can be evaluated and analyzed. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a front view of Embodiment 1 of a dynamic instantaneous vision continuous measurement system with variable test conditions of the present invention.

[0040] Figure 2 It is a side view of Embodiment 1 of a dynamic instantaneous vision continuous measurement system with variable test conditions of the present invention.

[0041] Figure 3 The present invention provides a continuous dynamic instantaneous vision curve after the test is completed by a dynamic instantaneous vision continuous measurement system with variable test conditions.

[0042] Figure 4 It is a side view of Embodiment 2 of a dynamic instantaneous vision continuous measurement system with variable test conditions of the present invention.

[0043] Figure 5 It is a front view of Embodiment 3 of a dynamic instantaneous vision continuous measurement system with variable test conditions of the present invention.

[0044] Among them, 1-display module, 2-optical lens module, 3-data processing module, 4-feedback module, 5-first position driving component, 6-slider structure, 7-second position driving component, 8-first LED light, 9-second LED light, 10-video acquisition module, 11-human eye. DETAILED DESCRIPTION

[0045] The present invention can be better explained below with reference to the accompanying drawings and specific embodiments.

[0046] like Figure 1 and Figure 2As shown, a dynamic instantaneous vision continuous measurement system with variable test conditions includes a display module 1, an optical lens module 2 is also provided between the display module and the human eye, a data processing module 3 is connected to the display module, and a feedback module 4 is also connected to the data processing module. The dynamic instantaneous vision continuous measurement device also includes a first position driving component 5, the first position driving component is an arc-shaped slide bar that can rotate 360° along the center, the display module also includes a slider structure 6, the display module can rotate relative to the slider structure, so that the display module always faces the human eye 11 and remains horizontal, the display module is connected to the first position driving component in the form of a slide bar slider, the first position driving component 5 can make the display module move along the slide bar in various directions so as to be located in any different gaze direction, and the curvature of the first position driving component makes the test distance of the display module in various gaze directions relatively consistent when used at close range.

[0047] The optical lens module is connected to the display module via a second position driving component 7 .

[0048] The second position driving component 7 is a retractable bracket formed by a plurality of hollow tubes which are nested and combined with each other. When extended, the tubes are nested and locked, and the length is fixed.

[0049] The second position driving assembly 7 can be retracted and stowed, and the optical lens module can be removed.

[0050] The dynamic instantaneous vision continuous measurement device also includes an ambient light source module, which includes a first LED lamp 8 and a second LED lamp 9 that provide glare light sources. The ambient light source module is arranged around the display module and the optical lens to simulate the impact of glare on dynamic instantaneous vision.

[0051] The dynamic instantaneous vision continuous measurement device also includes a video acquisition module 10, which records the blinking state of the human eye in real time.

[0052] Changes in test conditions:

[0053] 1. The opening and closing of the ambient light source modules 8 and 9, the adjustment of the brightness, the presence or absence of simulated glare, and the influence of the intensity of glare on continuous dynamic instantaneous vision.

[0054] 2. The first position driving component 5 can rotate 360° along the center, cooperating with the movement of the slider of the display module on the slide bar of the first position driving component 5, to simulate the continuous dynamic instantaneous vision of the human eye when looking at 9 eye positions in different directions.

[0055] 3. The real-time recording of blinks by the video acquisition module 10 can analyze the continuous dynamic instantaneous vision of the human eye under the states of free blinking, blink inhibition, and incomplete blinking.

[0056] 4. The display module 1 is used alone or the optical lens module 2 is used in combination with the display module 1 to achieve a continuous change in the test distance from near to far, simulating the effect of different test distances (0.4 meters to 6 meters) on continuous dynamic instantaneous vision.

[0057] 5. The contrast of the visual mark displayed by the display module 1 is variable (1% to 100%), simulating continuous dynamic instantaneous vision under different contrasts.

[0058] 6. Two or more of the above test conditions can be combined to simulate more diverse test environments.

[0059] Embodiment 1:

[0060] Please refer to Figure 1 and Figure 2 This embodiment is a continuous measurement of the dynamic instantaneous vision of a dry eye subject at a test distance of 0.6 meters, 100% sight mark contrast, downward gaze, and glare conditions. At this time, the sight mark contrast is set to 100%. At this time, the dynamic instantaneous vision of a single eye is measured. At this time, the second position driving component 7 extends the tube body and is nested and locked. The distance between the optical lens module 2 and the display module 1 is l is 0.9 meters, the refractive power of the optical lens is -10 diopters, and the image distance of the sight mark displayed by the display module after imaging by the optical lens is l’ It is 0.09 meters.

[0061] At this time, the magnification of the visual mark imaged by the display module through the optical lens module is M = 1 / (F* l +1) = 1 / 10, that is, the sight mark is reduced by 10 times.

[0062] At this time, the optical lens module and the display module are used in combination to measure the single-eye dynamic instantaneous vision. The distance between the human eye 11 and the optical lens is 0.51 meters, plus the image distance l’ That is, the test distance is 0.6 meters, and the display module displays a series of sight marks that are 10 times the size of 0.6 meters, that is, it displays sight marks of 6 meters.

[0063] The ambient light source module used at this time is 9, that is, the LED light around the optical lens, and the brightness of the light source is adjusted so that the illumination reaching the human eye 11 is 80 Lux.

[0064] The feedback module is a transponder 4 having four direction buttons: up, down, left and right.

[0065] At this time, the parameters of the data processing module are set, α is 0.03 log units, β is 0.05 seconds, the total test time T is 1 minute, the initial visual acuity VA1 is decimal visual acuity 2.0, and the data processing module contains:

[0066] Control unit, when measuring the average reaction time: control the display module to display 1-2 lines of sight marks above the subject's best corrected vision to ensure that the subject can recognize the currently displayed sight mark, the display module randomly displays sight marks in four different directions: up, down, left, and right, and the size of the sight mark remains unchanged. The subject uses the responder of the feedback module to press a button to respond, and the next sight mark is randomly displayed after the response. Repeat the above operation 30 times, record the subject's reaction time from the display of the sight mark to the key response each time, and calculate the average reaction time t of 30 responses. ave When the dynamic instantaneous visual acuity is continuously measured: after obtaining t ave After that, the visual mark on the control display module starts to display from the smallest visual mark that cannot be distinguished by the human eye. The initial visual acuity corresponding to the visual mark size at this time is recorded as 2.0. The visual acuity is expressed in decimal form. The time point at this time is recorded as t s The size of the sight mark increases gradually by 0.03 log units each time. The display duration of each size of the sight mark is 0.05 seconds. The visual acuity corresponding to the mth size of the sight mark is VA m , m is greater than or equal to 2, and the direction of the sight mark remains unchanged during the increase process until the feedback unit obtains a key signal result that matches the direction of the sight mark displayed at this time, and the time point when the key is pressed correctly is recorded as t e , reaction response time t r is the interval between the correct response time and the initial display time of the sight mark, that is, t r =t e -t s , t r The data is sent to the storage unit for recording, and then the direction of the sight mark is randomly changed and the above operation is continued for n times. During the continuous measurement process, n t r , n is greater than or equal to 2, and the test stops when the total test duration reaches 1 minute;

[0067] A feedback unit receives the key signal transmitted by the feedback module and transmits it to the control unit;

[0068] The calculation unit calculates the visual acuity value corresponding to the sight mark size.

[0069] The visual acuity corresponding to the size of the mth displayed sight mark is VA m :

[0070] logMAR(VA m ) = -log 10 (VA m-1 ) + α = -log 10(VA1) + (m-1)*0.03

[0071] VA m = 10 -logMAR(VAm)

[0072] t r The visual acuity corresponding to the size of the sight mark displayed at the time point is VA tr :

[0073] logMAR(VA tr ) = -log 10 (VA1) + INT(t r / 0.05) *0.03

[0074] VA tr = 10 -logMAR(VAtr)

[0075] The dynamic instantaneous visual acuity value VA obtained in each measurement dy :

[0076] logMAR(VA dy ) = -log 10 (VA1) + INT((t r -t ave ) / 0.05) *0.03

[0077] VA dy = 10 -logMAR(VAdy)

[0078] Storage unit, storing n response times t transmitted by the control unit r , initial visual acuity VA1, average reaction time t ave , n calculated dynamic instantaneous visual acuity values ​​VA dy ;

[0079] Output unit, outputs n reaction response times t stored by the storage control unit r , initial visual acuity VA1, average reaction time t ave , n calculated dynamic instantaneous visual acuity values ​​VA dy After the test is completed, the output is based on T, t r With VA dy Continuous dynamic instantaneous visual acuity curve and parameters, with blink time points marked on the curve.

[0080] In this embodiment, t ave is 0.615 seconds, n is 31 times, and 31 t are obtained after the test is completed r, i.e. [1.165, 1.215, 1.265, 1.465, 1.515, 2.715, 2.465, 1.215, 1.465, 1.815, 1.615, 1.565, 1.715, 1.515, 1.615, 1.615, 2.015, 2.815, 2.565, 2.615, 2.865, 3.265, 1.215, 1.565, 1.515, 1.615, 2.665, 2.015, 2.565, 2.565, 1.715], unit is seconds, get 31 VA dy The values ​​are [0.94, 0.87, 0.81, 0.62, 0.58, 0.11, 0.16, 0.87, 0.62, 0.38, 0.50, 0.54, 0.44, 0.58, 0.50, 0.50, 0.29, 0.10, 0.14, 0.13, 0.09, 0.05, 0.87, 0.54, 0.58, 0.50, 0.12, 0.29, 0.14, 0.14, 0.44], and the blink time is [12.1, 43.2, 58.1], in seconds, based on T, t r With VA dy The continuous dynamic instantaneous visual acuity curve is as follows Figure 3 .

[0081] Embodiment 2:

[0082] Please refer to Figure 4 This embodiment is a continuous measurement of the dynamic instantaneous vision of a cataract subject at a test distance of 5 meters, 25% sight mark contrast, forward horizontal gaze, and glare conditions. At this time, the sight mark contrast is set to 25%. At this time, the second position driving component 7 is retracted and retracted, and the optical lens module is removed. At this time, the dynamic instantaneous vision of one eye or two eyes is measured. The distance between the human eye 11 and the display module is l The test distance is 5 meters.

[0083] At this time, the display module displays the corresponding 5-meter sight mark.

[0084] The ambient light source module used at this time is 8, that is, the LED light around the display module, and the brightness of the light source is adjusted so that the illumination reaching the human eye 11 is 40 Lux.

[0085] The feedback module is a transponder 4 having four direction buttons: up, down, left and right.

[0086] At this time, the settings of the parameters α, β, the total test time T, the initial vision VA1 of the data processing module, the subsequent test process, and the continuous dynamic instantaneous vision curve and parameter output after the test are completed are similar to those in Example 1 and will not be repeated here.

[0087] Embodiment three:

[0088] Please refer to Figure 5 This embodiment is a dynamic instantaneous visual acuity continuous measurement of a strabismus subject at a test distance of 1 meter, 100% sight mark contrast, looking to the upper left, and no glare conditions. At this time, the sight mark contrast is set to 100%. At this time, the second position driving component 7 is retracted and retracted, and the optical lens module is removed. At this time, the dynamic instantaneous visual acuity of both eyes is measured. The distance between the human eye 11 and the display module is l The test distance is 1 meter.

[0089] At this time, the display module displays the corresponding 1-meter sight mark.

[0090] At this time, the ambient light source module 8, ie, the LED lights around the display module, are turned off.

[0091] The feedback module is a transponder 4 having four direction buttons: up, down, left and right.

[0092] At this time, the settings of the parameters α, β, the total test time T, the initial vision VA1 of the data processing module, the subsequent test process, and the continuous dynamic instantaneous vision curve and parameter output after the test are completed are similar to those in Example 1 and will not be repeated here.

[0093] In the several embodiments provided in this application, it should be understood that the disclosed settings of parameters such as α, β, total test time T, initial visual acuity VA1, and lens refractive power F, object distance l’ , image distance l’ The present invention may also be configured in other ways or implemented in other ways, and therefore should not be construed as limiting the present invention.

[0094] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A dynamic instantaneous vision continuous measurement system with variable test conditions, comprising a display module (1), It is characterized in that An optical lens module (2) is further provided between the display module (1) and the human eye (11); a data processing module (3) is connected to the display module (1); and a feedback module (4) is further connected to the data processing module (3); the dynamic instantaneous vision continuous measurement device further comprises a first position driving component (5); the first position driving component (5) is an arc-shaped sliding bar that can rotate 360 ​​degrees along the center; the display module (1) further comprises a slider structure (6); the display module (1) can rotate relative to the slider structure (6) so that the display module (1) always faces the human eye (11) and remains horizontal; the display module (1) and the first position driving component (5) are connected in the form of a sliding bar slider; the first position driving component (5) can enable the display module (1) to move along the sliding bar in various directions so as to be located in any different gaze direction; the arc of the first position driving component (5) enables the display module (1) to have a relatively consistent test distance in various gaze directions when used at a close distance; and the data processing module (3) comprises: The control unit, when measuring the average reaction time: controls the display module (1) to display 1-2 lines of sight marks above the subject's best corrected visual acuity to ensure that the subject can recognize the currently displayed sight mark, and the display module (1) randomly displays sight marks in four different directions: up, down, left, and right. The sight mark size remains unchanged. The subject uses the responder of the feedback module (4) to press a key to respond. After responding, the next sight mark is randomly displayed. Repeat the above operation 30 times, record the subject's reaction time from the display of the sight mark to the key response each time, and calculate the average reaction time tave of the 30 responses. During the continuous measurement of dynamic instantaneous visual acuity: after obtaining tave, the visual mark on the control display module (1) is initially displayed from the smallest visual mark that cannot be distinguished by the human eye (11), and the initial visual acuity corresponding to the size of the visual mark at this time is recorded as VA1. The visual acuity is expressed as decimal visual acuity, and the time point at this time is recorded as ts. The size of the visual mark is gradually increased by α log units each time. The display duration of each size of the visual mark is β. The visual acuity corresponding to the mth displayed visual mark size is VAm, where m is greater than or equal to 2. During the increase process, the direction of the visual mark remains unchanged until the feedback unit obtains a key signal result that matches the direction of the visual mark displayed at this time, and the time point when the key is pressed correctly is recorded as te. The reaction response time tr is the interval between the correct response time point and the initial display time point of the visual mark, that is, tr=te-ts. tr is transmitted to the storage unit for recording, and then the direction of the visual mark is randomly changed to continue the above operation n times. During the continuous measurement process, n trs can be obtained, where n is greater than or equal to 2. The total test time is T. When the total time T is reached, the test is stopped. T can be 10 seconds to 10 minutes. A feedback unit receives the key signal transmitted by the feedback module (4) and transmits it to the control unit; The calculation unit calculates the visual acuity value corresponding to the sight mark size. The visual acuity corresponding to the mth displayed sight mark size is VAm: logMAR(VAm) =-log10(VAm-1)+α=-log10(VA1)+ (m-1)*α VAm= 10-logMAR(VAm) The visual acuity corresponding to the size of the sight mark displayed at the tr time point is VAtr: logMAR(VAtr) =-log10(VA1)+INT(tr / β) *α VAtr = 10-logMAR(VAtr) The dynamic instantaneous visual acuity value VAdy obtained for each measurement: logMAR(VAdy) =-log10(VA1)+INT((tr-tave) / β) *α VAdy = 10-logMAR(VAdy) A storage unit, storing n reaction response times tr, initial visual acuity VA1, average reaction time tave, and n calculated dynamic instantaneous visual acuity values ​​VAdy transmitted by the control unit; The output unit outputs the n reaction response times tr, initial vision VA1, average reaction time tave, and n calculated dynamic instantaneous vision values ​​VAdy stored in the storage control unit. After the test is completed, the continuous dynamic instantaneous vision curve and parameters based on T, tr and VAdy are output, and the blink time point is marked in the curve.

2. A dynamic instantaneous vision continuous measurement system with variable test conditions according to claim 1, It is characterized in that The display module (1) is a display screen, which can display sight marks with different contrasts by adjusting the ratio of the display brightness of the background and the sight mark.

3. A dynamic instantaneous vision continuous measurement system with variable test conditions according to claim 1, It is characterized in that The optical lens module (2) is connected to the display module (1) via a second position driving component (7).

4. A dynamic instantaneous vision continuous measurement system with variable test conditions according to claim 3, It is characterized in that The optical lens module (2) and the second position driving component (7) are connected by magnetic attraction.

5. A dynamic instantaneous vision continuous measurement system with variable test conditions according to claim 3, It is characterized in that The second position driving component (7) is a retractable bracket formed by a plurality of hollow tubes which are nested and assembled with each other. When extended, the tubes are nested and locked, and the length is fixed.

6. A dynamic instantaneous vision continuous measurement system with variable test conditions according to claim 3, It is characterized in that The optical lens module (2) and the second position driving assembly (7) are detachably matched.

7. A dynamic instantaneous vision continuous measurement system with variable test conditions according to claim 1, It is characterized in that The dynamic instantaneous vision continuous measurement device also includes an ambient light source module. The ambient light source module includes a first LED lamp (8) and a second LED lamp (9) that provide glare light sources. The brightness is adjustable. The ambient light source module is arranged on the display module (1) and the periphery of the optical lens to simulate the effect of glare on dynamic instantaneous vision.

8. A dynamic instantaneous vision continuous measurement system with variable test conditions according to claim 1, It is characterized in that The dynamic instantaneous vision continuous measurement device further comprises a video acquisition module (10), and the video acquisition module (10) records the blinking state of the human eye (11) in real time.

9. A dynamic instantaneous vision continuous measurement system with variable test conditions according to claim 8, It is characterized in that The video acquisition module (10) is arranged above the display module (1) to perform real-time video recording of the blinking state of the human eye (11), capture the blinking time point, and calculate the blinking frequency.

Images