CN104825127A - Dynamic visual acuity detecting method - Google Patents
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Abstract
The invention discloses a dynamic visual acuity detecting method. The method includes the steps that optotypes used for dynamic visual acuity detection are generated according to an optotype generating instruction; the sizes, the moving directions, the moving speed and the contrast ratios of the optotypes are set according to parameters; the optotypes are output to a display device and move in the horizontal direction to become dynamic optotypes which have horizontal motion speed and are convenient to observe; detection result information is received and is stored and output after statistics is carried out on the detection result information. Dynamic visual acuity evaluation is achieved in the process of observing the horizontal motion optotypes by an individual, and a motion visual acuity checking system taking visual acuity evaluation in the process of observing the horizontal motion optotypes from far to near by the individual as the main content is consummated; in addition, the checking method is concise in operation process and high in checking efficiency, equipment is simple and saves space, and the dynamic visual acuity detecting method is adaptive to actual requirements of clinical diagnosis and treatment and can be used for meticulously evaluating visual functions of drivers, sportsmen and other crowds with the high requirement for dynamic visual acuity.
Description
Technical field
The invention belongs to the psychophysics field of measuring technique of human eye visual function, be specifically related to a kind of dynamic visual acuity detection method.
Background technology
The discernmible minimum visual angle of human eye is called as visual acuity, namely usually said vision.The common method of testing and assessing to visual acuity is visual acuity chart inspection technique, in the method between sighting target and experimenter without relative motion, evaluating result reflection experimenter static visual acuity.When there is relative motion when between sighting target and experimenter, the minimum visual angle that tested eye can be differentiated is called as dynamic visual acuity.Because individuality needs the object of identification mostly to be the dynamic object with certain movement speed in living scene, and driving, motion etc. have more and more important meaning in daily life with the closely-related activity of dynamic vision, dynamic visual acuity test and appraisal receive publicity gradually.
Different according to sighting target and experimenter's direction of relative movement, dynamic visual acuity test and appraisal can be divided into again the dynamic visual acuity test and appraisal under Depth Motion state to test and assess with the dynamic visual acuity under horizontal movement state.When sighting target does to experimenter the motion drawn near with certain speed, measured visual acuity is the dynamic visual acuity under Depth Motion state.When with certain speed, in face of experimenter, certain distance does horizontal motion to sighting target, measured visual acuity is the dynamic visual acuity under horizontal movement state.Dynamic visual acuity under Depth Motion state is measured by various dark vision tester for eyesight, and is applied to the special occupation such as driver, pilot crowd Assessment of visual function.But still only for visual science research, not yet there is the method and apparatus that can be used for larger scale clinical inspection in the dynamic visual acuity test and appraisal under horizontal movement state.
At present, the method can carrying out the dynamic visual acuity test and appraisal under horizontal movement state has following several: (1) rotating projection method: sighting target is projected to a reflecting mirror with projector equipment, reflecting mirror at the uniform velocity rotates within the specific limits, its velocity of rotation can adjust by experimental concrete needs, sighting target is projected to by this face reflecting mirror the arcuate screens made with projection screen, experimenter carries out identification to the sighting target on screen.In the method, the form of sighting target is unrestricted, and because sighting target motion is by reflecting mirror rotation realization, distortion free when sighting target is presented on screen, sighting target movement velocity can reach 150 °/s.But the equipment involved by this method is loaded down with trivial details, is only applicable to experimentation, clinical practice inspection can not be used for; (2) LASER Light Source sciagraphy: with wavelength be 633-670nm LASER Light Source replace projector equipment alphabetical sighting target is projected to reflecting mirror, sighting target movement velocity can reach 150 °/s, late effect due to laser firing time can make the sighting target of high-speed motion occur metaboly, sighting target in the method can only be alphabetical sighting target, and still utilize the rotation of reflecting mirror to obtain dynamic visual testing sign, still need to arrange annular screen, be only applicable to experimentation, clinical practice inspection can not be used for; (3) computer program combined with fluorescent panel type display projection method: obtain dynamic visual testing sign in the mode of computer program combined with fluorescent panel type display, do not need rotating mirror and annular curtain, comparatively loose to the requirement of equipment and inspection environment, owing to being subject to the restriction of fluorescent screen scintillation effect, the movement velocity of sighting target is many lower than 10 °/below s, the highlyest only can reach 50 °/s, the movement velocity scope (60 °/s-150 °/s) of familiar object in daily life can not be covered, therefore can not meet the needs of actual test and appraisal.
Summary of the invention
Because the various defects of prior art, the invention provides a kind of method can implemented dynamic visual acuity and check in clinical ophthalmology diagnosis and treatment process, the method can simplify assessment process, involved apparatus is relatively simple, be easy to purchase and floor space is little, is convenient in clinical ophthalmology diagnosis and treatment work, carry out larger dynamic visual acuity inspection work.
For achieving the above object, the invention provides a kind of dynamic visual acuity detection method, the method comprises: generate instruction according to sighting target and generate the sighting target being used for dynamic visual acuity and detecting; The size of sighting target, moving direction, translational speed and contrast according to parameter setting; Described sighting target is outputted to display device, and realizes horizontal direction and move, make it to become and there is horizontal movement speed and be convenient to the dynamic visual testing sign observed; Receive testing result information, and will carry out after testing result Information Statistics storing and exporting.
Wherein, described sighting target is the English alphabet sighting target for examination of visual acuity, and is the picture of resolution at least 300dpi by computer graphics and image procossing.
Wherein, the English alphabet of described sighting target is " H " " O " " T " " V ".
Wherein, according to parameter setting, the size of sighting target comprises the height setting described sighting target, and its setting formula is: sighting target height=program window height × sighting target actual height/actual displayed visual field height; Wherein, program window height is after program is opened, and the default height of the window shown over the display, in units of pixel; Sighting target actual height is the sighting target actual height on the projection screen pre-set, and unit is centimetre; Actual displayed visual field height is the actual height that program window is incident upon on projection screen, and unit is centimetre.
Wherein, according to parameter setting, the formula of the translational speed of sighting target is: sighting target translational speed=program window width/sighting target displaying time; Wherein, program window width is after program is opened, and the acquiescence width of the window shown over the display, in units of pixel; Sighting target displaying time is that program window is incident upon developed width on projection screen divided by sighting target actual translational speed on the projection screen, and unit is second.
A kind of dynamic visual acuity detection method of the present invention, described sighting target is outputted to display device, and realize horizontal direction and move and comprise: first sighting target display frequency f is set, the i.e. number of display sighting target per second, then use sighting target display frequency f divided by sighting target movement speed v, obtain the sighting target number n needing to arrange, then be arranged on equidistant for this n sighting target in program window, and the display properties of this n sighting target is set to not visible; Finally creating thread, be visual, and the display properties arranging a sighting target is not visible by arranging the display properties of current sighting target, realizes visual sighting target at the uniform velocity moving process from left to right or from right to left.
Method of the present invention also comprises: when be reduced to due to sighting target movement speed v make projection screen to occur conditions of streaking time, each sighting target is sorted in order, low speed controling parameters x is set, then each sighting target sequence number is divided by described low speed controling parameters x, aliquant sighting target is set to invalid sighting target, delete, to eliminate conditions of streaking, described low speed controling parameters x be greater than 1 natural number.
Wherein, testing result information stored described and export in this step, design specialized charting is used for record check result, this form domestic demand indicates visual acuity (vision) value, the sighting target size input value corresponding with each vision value and the sighting target presenting sequence corresponding with each visual acuity (vision) value, needs to be provided with to fill a vacancy formula posting field for recording experimenter's ordinary circumstance, detecting sighting target velocity level and detect sighting target contrast simultaneously.
Dynamic visual acuity detection method provided by the invention achieves the test and appraisal to dynamic visual acuity during individual eye-level motion sighting target, perfect at present with individuality observe draw near motion sighting target time visual acuity test and appraisal be that the motion visual acuity of main contents checks system; In addition, inspection method operating process is succinct, and checking efficiency is high, and equipment is simple and save space, adapts to the actual needs of clinic diagnosis, can be used for careful assess driver, athlete etc. and to have higher requirements to dynamic visual acuity the visual function of crowd.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, (note: the accompanying drawing in the following describes is only some embodiments of the present invention is briefly described below by the accompanying drawing used required in embodiment or description of the prior art, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings).
Fig. 1 is the flow chart of dynamic visual acuity detection method one embodiment of the present invention.
Fig. 2 is the method flow diagram that dynamic visual acuity detection method one embodiment of the present invention can implement dynamic visual acuity inspection in clinical ophthalmology diagnosis and treatment process.
Fig. 3 is the sighting target element picture schematic diagram for showing of dynamic visual acuity detection method one embodiment of the present invention.
Fig. 4 is that the dynamic visual acuity of dynamic visual acuity detection method one embodiment of the present invention detects interface schematic diagram.
Fig. 5 is the sighting target kinematic parameter control strip schematic diagram of dynamic visual acuity detection method one embodiment of the present invention.
Fig. 6 is the dynamic visual testing sign input abridged table schematic diagram of dynamic visual acuity detection method one embodiment of the present invention.
Fig. 7 is the test result charting schematic diagram of dynamic visual acuity detection method one embodiment of the present invention.
Detailed description of the invention
The embodiment of the present invention provides a kind of dynamic visual acuity detection method, refers to Fig. 1, and Fig. 1 is the flow chart of embodiment of the present invention dynamic visual acuity detection method, and the method specifically comprises the following steps:
Step S110: generate instruction according to sighting target and generate the sighting target being used for dynamic visual acuity and detecting.
Step S120: the size of sighting target, moving direction, translational speed and contrast (i.e. transparency) according to parameter setting.
Step S130: described sighting target is outputted to display device, and realize horizontal direction and move, makes it to become and has horizontal movement speed and be convenient to the dynamic visual testing sign observed.
Step S140: receive testing result information, and will carry out after testing result Information Statistics storing and exporting.
Wherein, sighting target described is in step s 110 the English alphabet sighting target for examination of visual acuity, and by the high definition picture of computer graphics and image procossing, is the picture of resolution at least 300dpi.Sighting target wherein can adopt English alphabet to be the picture of " H " " O " " T " " V ", as described in Figure 3.In international standard visual acuity chart, the standard of twenty-twenty vision value is 1.0 (fractional representations) or more, its meaning is the sighting target of distinguishable 1 ' angle spatial variations, 1 ' angle sighting target refers to that the space between the stroke of sighting target and stroke is 1 ' angle, therefore require that the letter being used for sighting target in visual acuity chart has the structure can carrying out decile, such as, letter e in letter " E " visual acuity chart, according to this morphologic criteria, multiple letter all can be used for visual acuity chart and makes, and HTVO is wherein one group; According to the needs in actual application, the element that other sighting targets that can be used for visual acuity chart making are shown as dynamic visual testing sign can be selected.
Wherein, according to parameter setting, the size of sighting target comprises the height setting described sighting target in the step s 120, and its setting formula is: sighting target height=program window height × sighting target actual height/actual displayed visual field height; Wherein, program window height is after program is opened, the default height of the window shown over the display, in units of pixel, as shown in Figure 4; Sighting target actual height is the sighting target actual height on the projection screen pre-set, and unit is centimetre; Actual displayed visual field height is the actual height that program window is incident upon on projection screen, and unit is centimetre.
Wherein, according to parameter setting, the formula of the translational speed of sighting target is in the step s 120: sighting target translational speed=program window width/sighting target displaying time; Wherein, program window width is after program is opened, the acquiescence width of the window shown over the display, in units of pixel, as described in Figure 4; Sighting target displaying time is that program window is incident upon developed width on projection screen divided by sighting target actual translational speed on the projection screen, and unit is second.
Wherein, in step s 130, which sighting target is outputted to display device, and realize horizontal direction and move and comprise: first sighting target display frequency f is set, the i.e. number of display sighting target per second, then use sighting target display frequency f divided by sighting target movement speed v, obtain the sighting target number n needing to arrange, i.e. n=f/v, be arranged on equidistant for this n sighting target in program window again, and the display properties of this n sighting target is set to not visible; Finally creating thread, be visual, and the display properties arranging a sighting target is not visible by arranging the display properties of current sighting target, realizes visual sighting target at the uniform velocity moving process from left to right or from right to left.
When be reduced to due to sighting target movement speed v make projection screen to occur conditions of streaking time, each sighting target is sorted in order, low speed controling parameters x is set, then each sighting target sequence number is divided by described low speed controling parameters x, aliquant sighting target is set to invalid sighting target, delete, to eliminate conditions of streaking, described low speed controling parameters x be greater than 1 natural number.
Low speed in low speed controling parameters may be defined as the critical velocity that conditions of streaking appears in sighting target in display process, this speed is all relevant with the performance in order to realize Program Type that sighting target moves and display device, in the method for testing of one embodiment of the invention, if do not arranged low speed controling parameters, there is the conditions of streaking in sighting target motor process when sighting target movement velocity is low to moderate below 3 meter per seconds; The basic skills that low speed controling parameters is arranged be under the prerequisite that this state modulator open port is set by field adjustable after setting be applicable to the low speed controling parameters of selected projection speed; In the method for one embodiment of the invention, after the sighting target project effect under selected multiple test speed being debugged under actual test scene, think that arranging low speed controling parameters is that " 5 " can meet the effect being issued to sighting target stable motion in great majority projection speed according to the effect of debugging, therefore suggestion arranges low speed controling parameters is 5.
Wherein, in step S140, design specialized charting is used for record check result, this form domestic demand indicates visual acuity (vision) value, the sighting target size input value corresponding with each vision value and the sighting target presenting sequence corresponding with each visual acuity (vision) value, need to be provided with simultaneously and fill a vacancy formula posting field for recording experimenter's ordinary circumstance, detecting sighting target velocity level and detect sighting target contrast, as shown in Figure 7.
Lift the embodiment of the method that specifically implements dynamic visual acuity inspection in clinical ophthalmology diagnosis and treatment process below again.
The device implementing dynamic visual acuity inspection in clinical ophthalmology diagnosis and treatment process comprises that dynamic visual testing sign generates with state modulator platform, project projection equipment and projection screen.Dynamic visual testing sign generates with the foundation of state modulator platform based on electronic computer, is 1. CPU: Pentium II 300MHz or higher to the hardware requirement of this electronic computer; Minimum Pentium II 233MHz; 2. internal memory: 128MB or higher, minimum 64MB; 3. hard drive space: 1.5GB available hard disk space; The software environment of this electronic computer can be WINXP, VISTA, WIN7 or WIN8.Projection projection equipment is digital projector, and after its projection image is received by projection screen, the surface illuminance of screen need reach more than 500 luxs (lux), and image overall width is 1 meter.Projection screen is white diffuse reflective screen, width more than 1 meter or 1 meter, and height 1 meter or more, is positioned at experimenter's dead ahead 4 meters of.
In the present invention, dynamic visual testing sign is generated and is realized by following steps with the foundation of state modulator platform, thus reaches generation dynamic visual testing sign to detect the object that experimenter observes dynamic visual acuity when having varying level movement velocity dynamic visual testing sign, as shown in Figure 2:
1, make the sighting target being used for dynamic visual acuity and checking: the high definition picture element alphabetical sighting target (example: H, O, T, V) that can be used for examination of visual acuity being made as more than 300dpi by the method for computer graphics and image procossing, preserve as sighting target projection material.
2, sighting target motion is in the horizontal direction realized, make it to become and there is horizontal movement speed and the dynamic visual testing sign being convenient to observation: realized by computer programming, and this sighting target is presented on by the mode of computer connection projection projection equipment the projection screen being positioned at experimenter's dead ahead 4 meters of, make experimenter directly can observe dynamic visual testing sign, to the movement velocity of dynamic visual testing sign, the parameter such as size and contrast sets, the sighting target time used differentiated in record simultaneously: by the method for computer programming, sighting target movement velocity is contained in setting, sighting target size, the control module of sighting target contrast settings and synchrotimer, this module will to contain sighting target movement velocity, sighting target size, the control panel form of sighting target contrast input dialogue frame and timer presents, can be set the parameters of dynamic visual testing sign in the respective dialog frame of this panel by computer keyboard, directly can be read by the timing viewing area on this panel and check the time used, as shown in Figure 5.
Concrete implementation strategy is:
A. selected playing material: the sighting target high definition picture made in step (1) is as playing resource material.
B. sighting target height is calculated: 1. calculated by formula and obtain the built-in sighting target height of dynamic visual acuity test program.
Program built-in sighting target height (pixel)=program window height (pixel) × sighting target actual height (centimetre)/actual displayed visual field height (centimetre) ... 1.
C. sighting target translational speed is calculated: 2. calculated by formula and obtain sighting target translational speed.
Sighting target translational speed=program window width (pixel)/sighting target displaying time (second) ... 2.
Wherein sighting target displaying time (second)=actual displayed visual field width (centimetre)/sighting target actual translational speed (cel) on the projection screen.
D. the stable motion of sighting target horizontal direction is realized: show program for Flash, first Flash program updating rate f is set, the namely display frequency of sighting target, the i.e. number of display sighting target per second, then use sighting target display frequency f divided by sighting target movement speed v, obtain the sighting target movieclip number n needing to arrange, then sighting target movieclip is equidistant is arranged in program window by this n, and the display properties of this n sighting target movieclip is set to not visible; Finally create runme thread, be visual true by arranging the display properties visible of current sighting target, and the display properties visible arranging a sighting target being not visible false, realizing visual sighting target at the uniform velocity moving process from left to right or from right to left.By this logic (the sighting target movieclip generated at a high speed is few, and low speed is many), this addresses the problem the phenomenon of high speed sighting target shake.But, when low speed, because the sighting target generated is too much, cause there is conditions of streaking, through overtesting, (namely sighting target sequence number rems to low speed controling parameters to adopt low speed controling parameters to control the quantity of effective sighting target, remainder be zero sighting target be effective sighting target), thus control conditions of streaking.The setting of this low speed controling parameters is: when be reduced to due to sighting target movement speed v make projection screen to occur conditions of streaking time, each sighting target is sorted in order, low speed controling parameters x is set, then each sighting target sequence number is divided by described low speed controling parameters x, aliquant sighting target is set to invalid sighting target, delete, to eliminate conditions of streaking, described low speed controling parameters x be greater than 1 natural number.
Can adjust to reach optimum display effect to low speed parameter according to the performance of display device in actual use procedure.In test environment, when speed is lower than 3 meter per second, conditions of streaking is obvious, and configuration low speed controling parameters is 5, can reach better effects.
E. sighting target contrast controls: by regulating its transparency of alpha property control (contrast) of projection element and sighting target.
F. single sighting target projection: occur kind by substituting sighting target resource material control sighting target, realize the single projection of sighting target, namely operator needs the sighting target of projection by a keyboard entry.
G. sequence sighting target projection: by configuration " play sequence ", as VHTOOTHV controls the order of sighting target appearance, the interval of next sighting target appearance is controlled by controlling " interval ", the sequence realizing sighting target is play, and namely after operator's start detection program, sighting target just starts to show one by one in a certain order, at a certain time interval.
3, dynamic visual testing sign projection: being connected to digital projector by being loaded with the generation of above-mentioned dynamic visual testing sign with the computer of state modulator platform, regulating scialyscope position, making its overall width projecting image be 1 meter thus adapt with the computational methods in sighting target generative process; Regulate each control assembly of scialyscope (concrete debud mode illustrates according to each digital projector), make projected image definition be presented in screen and central point and experimenter's binocular horizontal parallel; Run above-mentioned dynamic visual testing sign to generate and state modulator platform, according to reality test needs, utilize the control strip be shown on screen that sighting target parameters is set, carry out dynamic visual acuity test.
4, record is carried out to dynamic visual acuity testing result measured under each detected state: design specialized charting is used for record check result, this form domestic demand indicates visual acuity (vision) value, the sighting target size input value corresponding with each vision value and the sighting target presenting sequence corresponding with each vision value, need to be provided with for recording experimenter's ordinary circumstance, detecting formula of the filling a vacancy posting field of sighting target velocity level and detection sighting target contrast simultaneously, thus while simplifying testing process, improve the standardization level of operation and outcome record as far as possible.
To show sighting target by Flash program, carry out program inside by Actionscript 2.0 programming language and be set to example, the programming code realizing above-mentioned 2nd step exhibition policy is as follows:
To show sighting target above by Flash program, carry out by Actionscript 2.0 programming language dynamic visual testing sign that program inside arranges foundation to generate with state modulator platform to be example, a kind of occupation mode of device can implemented dynamic visual acuity and check in clinical ophthalmology diagnosis and treatment process disclosed in this invention is described.
1. detection site surrounding is set.
(1) detecting distance: it is 4 meters that experimenter and sighting target show vertical dimension between projection screen.
(2) projection screen specification and position: white diffuse reflective screen, width >=1 meter, is arranged at and is subject to by highly >=1 meter
Examination person's dead ahead.
2. equipment connection.
Connect computer and digital projector.
3. debug digital projector.
The image width regulating scialyscope position to make screen presents after opening digital projector is 1 meter, regulate each control assembly of scialyscope (concrete debud mode illustrates according to each digital projector), make projected image definition be presented in screen and central point and experimenter's binocular horizontal parallel;
4., in computer operation interface, represent the icon of this platform to run this platform with right mouse button double-click.
5. enter and detect interface.
Right mouse button clicks maximize button, and projection surface is maximized, and as shown in Figure 4, now the width of test screen is 1 meter.
6. utilize control strip to select detecting pattern to start to carry out dynamic visual acuity detection.
As shown in Figure 5, include detecting pattern and select and sighting target size, speed, transparency (i.e. contrast) control data input frame, each input frame effect is as follows for control strip:
1.: sighting target movement velocity input frame, for inputting the sighting target horizontal movement speed values represented with linear velocity (meter per second, m/s);
2.: sighting target transparency and contrast input frame, for inputting transparency and the contrast numerical value (example: drafting the contrast exporting sighting target is 75%, then need input " 75 " in this input frame) of sighting target.
3.: timer, display dynamic visual acuity detects the time continued, and recognizes for recording experimenter the time (millisecond, ms) that a certain velocity level's sighting target is used.
4.: sighting target size input frame, for inputting the sighting target height number being shown in projection screen, thus setting show visual acuity corresponding to sighting target, each visual acuity is all corresponding with specific sighting target height number, and concrete corresponding relation is shown in Fig. 6.
5.: low speed controling parameters input frame, for setting the hiding degree of projection sighting target, thus the jitter phenomenon produced when avoiding sighting target to move.
6.: enter static button, static sighting target display mode can be entered after pressing.
7.: start button, dynamic visual testing sign projection can be started after pressing.
8.: reset button, the original timing result of rear timer is pressed by automatic clear.
Dynamic visual testing sign projection parameter setting method:
A: the input value unit of sighting target speed is " meter per second (m/s) " (angular velocity of sighting target motion, obtains after need calculating in conjunction with the distance between experimenter and projection screen).
B: the input value of sighting target size represent sighting target with experimenter's dead ahead 4 meter Chu, the screen of wide 1 meter on show time actual height, its unit is centimetre (cm), and the sighting target height input value corresponding to each visual acuity (fractional representation and LogMAR representation) is shown in that in accompanying drawing, dynamic visual testing sign inputs shown in abridged table.
C: the input value of low speed controling parameters is that (example: 1,2,3,4,5), determines after its value needs to adjust according to project effect after arranging sighting target projection speed positive integer, and concrete grammar sees above explanation.
D: namely transparency shows the contrast of sighting target, setting is needed according to test, example: drafting the contrast exporting sighting target is 75%, then need input " 75 " in this input frame, if do not input any numerical value, then this test program shows 100% contrast sighting target (the ater sighting target under white background) according to default value.
E. dynamic visual acuity test is started:
According to method mentioned above, input sighting target speed and sighting target size successively, in low speed controling parameters input frame, input " 5 " (value is hidden in the suggestion under general speed), click START button in control strip with right mouse button, enter dynamic visual testing sign projection holding state.
Note: carry out dynamic visual acuity when detecting, the dynamic visual testing sign parameter that must input comprises the movement velocity of sighting target, sighting target size and low speed controling parameters, and transparency is that parameter is filled out in choosing.
F. dynamic visual testing sign is shown: after entering dynamic visual testing sign projection holding state, to occur that expression enters keyboard listening state mark in control strip, in this condition, by a keyboard entry with need to show the consistent letter of sighting target and can show this alphabetical sighting target (H, O, T, V), sighting target presenting sequence corresponding to each level of visual acuity is shown in dynamic visual testing sign input abridged table in Fig. 6.
G. controling parameters is changed: as changed one or more controling parameters (speed, sighting target size, transparency and low speed controling parameters), need click after " stopping " button in control strip stops sighting target projection with right mouse button and input target value in corresponding input frame, click START button in control strip with right mouse button after change and reenter dynamic visual testing sign projection holding state and start test.
7. result is read to sentence and record:
A. based on static eyesight testing gained visual acuity result, consult dynamic visual testing sign input abridged table in accompanying drawing, by the sighting target size input sighting target size input frame corresponding to this visual acuity, as the initial visual acuity that dynamic visual acuity detects, need setting sighting target speed according to detection.
B. click START button in control strip with right mouse button, enter dynamic visual testing sign projection holding state.
C. dynamic visual testing sign input abridged table in Fig. 6 is consulted, letter key corresponding in computer keyboard is pressed successively to show this alphabetical sighting target according to the sighting target order corresponding to visual acuity set in step a, experimenter (say letter names or describe letter shapes with gesture) please be recognized after each alphabetical sighting target reflects 3 times, correct identification 4 letters and above namely think reach this visual acuity representated by row sighting target and start to show its next line sighting target (example: that a line sighting target → right mouse button that can all to recognize with fractional representation visual acuity be 0.5 is clicked dynamic visual testing sign in " stoppings " button in control strip → with reference to the accompanying drawings and inputted abridged table and arrange sighting target size → right mouse button and click that a line sighting target that START button in control strip → show with fractional representation visual acuity is 0.63).
If 3 or following in initial visual acuity sighting target only can be recognized, namely show its lastrow sighting target (example: only can recognize with fractional representation visual acuity to be that 2 → right mouse button in that a line sighting target of 0.5 is clicked dynamic visual testing sign in " stoppings " button in control strip → with reference to the accompanying drawings and inputted abridged table and arrange sighting target size → right mouse button and click that a line sighting target that START button in control strip → show with fractional representation visual acuity is 0.4).
D. the visual acuity corresponding to minimum a line sighting target that record experimenter can recognize is the dynamic visual acuity of experimenter; If experimenter can not recognize that with fractional representation visual acuity be in that a line sighting target of 0.1 4 or more, be then designated as and can not coordinate dynamic visual acuity inspection.
By outcome record in specific record form example, as shown in Figure 7.
Dynamic visual acuity detection method provided by the invention, the method can programmed by electronic computer produces dynamic visual testing sign, by program inside arrange realize sighting target in the horizontal direction at the uniform velocity, easy motion, velocity interval covers comparatively wide (10 °s/sec-150 °s/sec); Arrange contain sighting target speed, sighting target size, sighting target contrast arrange the control strip of dialog box and be presented in computer interface, by computer keyboard, personal settings are carried out to each parameter of sighting target by this dialog box, thus simplify operating process; Design specialized outcome record form makes operation and outcome record methodological standardization; Projection projection system is digital projector, screen is the diffuse-reflectance flat screen of wide 1 meter high 1 meter, equipment is simple, saving space, method of testing convenient operation, is applicable in clinical ophthalmology diagnosis and treatment process and carries out dynamic visual acuity detection in large-scale, high-efficiency to driver, athlete etc. to the crowd that dynamic visual acuity has higher requirements.
Above-described detailed description of the invention; object of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only the specific embodiment of the present invention; the protection domain be not intended to limit the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. a dynamic visual acuity detection method, is characterized in that, the method comprises:
Generate instruction according to sighting target and generate the sighting target being used for dynamic visual acuity and detecting;
The size of sighting target, moving direction, translational speed and contrast according to parameter setting;
Described sighting target is outputted to display device, and realizes horizontal direction and move, make it to become and there is horizontal movement speed and be convenient to the dynamic visual testing sign observed;
Receive testing result information, and will carry out after testing result Information Statistics storing and exporting.
2. a kind of dynamic visual acuity detection method as claimed in claim 1, is characterized in that:
Described sighting target is the English alphabet sighting target for examination of visual acuity, and is the picture of resolution at least 300dpi by computer graphics and image procossing.
3. a kind of dynamic visual acuity detection method as claimed in claim 2, is characterized in that:
The English alphabet of described sighting target is " H " " O " " T " " V ".
4. a kind of dynamic visual acuity detection method as claimed in claim 1, is characterized in that:
According to parameter setting, the size of sighting target comprises the height setting described sighting target, and its setting formula is:
Sighting target height=program window height × sighting target actual height/actual displayed visual field height;
Wherein, program window height is after program is opened, and the default height of the window shown over the display, in units of pixel; Sighting target actual height is the sighting target actual height on the projection screen pre-set, and unit is centimetre; Actual displayed visual field height is the actual height that program window is incident upon on projection screen, and unit is centimetre.
5. a kind of dynamic visual acuity detection method as claimed in claim 1, is characterized in that:
According to parameter setting, the formula of the translational speed of sighting target is:
Sighting target translational speed=program window width/sighting target displaying time;
Wherein, program window width is after program is opened, and the acquiescence width of the window shown over the display, in units of pixel; Sighting target displaying time is that program window is incident upon developed width on projection screen divided by sighting target actual translational speed on the projection screen, and unit is second.
6. a kind of dynamic visual acuity detection method as claimed in claim 1, is characterized in that:
Described sighting target is outputted to display device, and realizes horizontal direction and move and comprise:
First sighting target display frequency f is set, the i.e. number of display sighting target per second, then uses sighting target display frequency f divided by sighting target movement speed v, obtains the sighting target number n needing to arrange, be arranged on equidistant for this n sighting target in program window again, and the display properties of this n sighting target is set to not visible; Finally creating thread, be visual, and the display properties arranging a sighting target is not visible by arranging the display properties of current sighting target, realizes visual sighting target at the uniform velocity moving process from left to right or from right to left.
7. a kind of dynamic visual acuity detection method as claimed in claim 6, is characterized in that, also comprise:
When be reduced to due to sighting target movement speed v make that on projection screen, conditions of streaking appears in sighting target time, each sighting target is sorted in order, low speed controling parameters x is set, then each sighting target sequence number is divided by described low speed controling parameters x, aliquant sighting target is set to invalid sighting target, delete, to eliminate conditions of streaking, described low speed controling parameters x be greater than 1 natural number.
8. a kind of dynamic visual acuity detection method as claimed in claim 1, is characterized in that:
Testing result information stored described and export in this step, design specialized charting is used for record check result, this form domestic demand indicates visual acuity (vision) value, the sighting target size input value corresponding with each vision value and the sighting target presenting sequence corresponding with each visual acuity (vision) value, needs to be provided with to fill a vacancy formula posting field for recording experimenter's ordinary circumstance, detecting sighting target velocity level and detect sighting target contrast simultaneously.
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