CN109700422A - Measure the device of vision system contrast sensitivity - Google Patents
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- CN109700422A CN109700422A CN201811604859.8A CN201811604859A CN109700422A CN 109700422 A CN109700422 A CN 109700422A CN 201811604859 A CN201811604859 A CN 201811604859A CN 109700422 A CN109700422 A CN 109700422A
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Abstract
The invention discloses a kind of devices for measuring vision system contrast sensitivity, comprising: display module, for showing the stripe pattern with pre-set space frequency and default contrast to the vision system of user；Receiving module, the instruction in the direction for selecting shown stripe pattern for receiving user's input, the direction of stripe pattern refers to the direction of striped in image；Data processing module, when direction for selecting as user is consistent with the direction of shown stripe pattern, record the spatial frequency values and contrast value of shown stripe pattern, and according to the default contrast sensitivity function value for commenting value standard to obtain corresponding shown stripe pattern, and the variation relation for the contrast sensitivity function value and spatial frequency values measured according to record data output.The device that the present invention measures vision system contrast sensitivity realizes the contrast sensitivity situation of measurement vision system, solves problem of the prior art.
Description
Technical field
The present invention relates to technical field of vision detection, more particularly to a kind of dress for measuring vision system contrast sensitivity
It sets.
Background technique
In daily life, human eye needs to differentiate the object of sharpness of border, it is also desirable to the object of obscurity boundary is differentiated, it is latter
Kind resolution capability is known as contrast sensitivity (contrast sensitivity, CS).Contrast sensitivity is defined as vision system energy
The inverse for the contrast threshold perceived, that is, contrast sensitivity=1/ contrast threshold, the low then contrast sensitivity of contrast threshold
Height, then visual performance is good.In a certain spatial frequency, vision system has certain contrast sensitivity；Conversely, in same contrast
When, vision system has certain spatial frequency resolving power (i.e. shape feel).
Clinically, the shape of vision system is felt is determined with eyesight, and usual eyesight measured under high contrast.But
The contrast sensitivity of vision system can independently be damaged and eyesight is still kept well, and at this moment patient is difficult to describe the disease of oneself
Shape.In consideration of it, how to realize the contrast sensitivity situation of measurement vision system, current those skilled in the art need to solve
Technical problem.
Summary of the invention
The object of the present invention is to provide a kind of devices for measuring vision system contrast sensitivity, realize measurement vision system
Contrast sensitivity situation, solve problem of the prior art.
To achieve the above object, the invention provides the following technical scheme:
A kind of device measuring vision system contrast sensitivity, comprising:
Display module, for showing the bar graph with pre-set space frequency and default contrast to the vision system of user
Picture；
Receiving module, the instruction in the direction for selecting shown stripe pattern for receiving user's input, the item
The direction of print image refers to the direction of striped in image；
Data processing module when the direction for selecting as user is consistent with the direction of shown stripe pattern, records institute
It shows the spatial frequency values and contrast value of stripe pattern, and comments value standard to obtain corresponding shown stripe pattern according to default
Contrast sensitivity function value, and the variation relation for the contrast sensitivity function value and spatial frequency values measured according to record data output.
Preferably, the display module includes showing interface, first control unit and the second control unit；
The displaying interface is used to show stripe pattern to the vision system of user；
The first control unit is used to control sequence of the displaying interface with spatial frequency values from big to small, in turn
The stripe pattern with different space frequency value is shown to user's vision system；
Second control unit corresponds to the same space frequency values for controlling the displaying interface, in turn regards to user
Feel system demonstration with the spatial frequency values, stripe pattern with different contrast value.
Preferably, the display module further includes judging unit, and the judging unit is used to judge the direction of user's selection
It is whether consistent with the direction of shown stripe pattern；
If the direction that second control unit is specifically used for user's selection is consistent with the direction of shown stripe pattern,
Control the lower stripe pattern of displaying showing interface, the spatial frequency values of next stripe pattern and the sky of current fringes image
Between frequency values it is identical, the contrast value of next stripe pattern is less than the contrast value of current fringes image；
If the first control unit is inconsistent specifically for the direction of user's selection and the direction of shown stripe pattern,
The lower stripe pattern of displaying showing interface is then controlled, the spatial frequency values of next stripe pattern are less than current fringes image
Spatial frequency values.
Preferably, the display module further includes third control unit, and the third control unit is for controlling the exhibition
Show that interface corresponds to the same space frequency values and same contrast value, in turn shows that there is the spatial frequency to user's vision system
The stripe pattern of the preset quantity different directions of value and the contrast value, the preset quantity are more than or equal to three.
Preferably, the display module further includes judging unit, and the judging unit is used to judge the direction of user's selection
It is whether consistent with the direction of shown stripe pattern；
If second control unit is specifically used for the correspondence the same space frequency values that show to user's vision system and together
The direction for thering are at least two users to select in the stripe pattern of the preset quantity different directions of one contrast value and shown item
The direction of print image is consistent, then controls the lower stripe pattern of displaying showing interface, the spatial frequency of next stripe pattern
Value is identical with the spatial frequency values of current fringes image, and the contrast value of next stripe pattern is less than pair of current fringes image
Compare angle value；
If second control unit also particularly useful for the correspondence the same space frequency values that are shown to user's vision system and
In the stripe pattern of the preset quantity different directions of same contrast value, the direction of only one user selection and shown item
The direction of print image is consistent, then controls the lower stripe pattern of displaying showing interface, the spatial frequency of next stripe pattern
Value is identical with the spatial frequency values of current fringes image, and the contrast value of next stripe pattern is greater than pair of current fringes image
Compare angle value；
If the first control unit is specifically used for the correspondence the same space frequency values that show to user's vision system and together
In the stripe pattern of the preset quantity different directions of one contrast value, there is not the direction of user's selection and shown striped
The direction of image is consistent, then controls the lower stripe pattern of displaying showing interface, the spatial frequency values of next stripe pattern
Less than the spatial frequency values of current fringes image.
Preferably, the third control unit is specifically used for controlling the displayings interface and corresponds to the same space frequency values and together
One contrast value in turn shows three different directions with the spatial frequency values and the contrast value to user's vision system
Stripe pattern, three different directions include vertical 90 degree of directions, 45 degree of directions clockwise and 45 degree of directions counterclockwise.
Preferably, second control unit corresponds to the displaying of spatial frequency values 18 specifically for controlling the displaying interface
The contrast value of initial stripe pattern is 20%, and the contrast value for the initial stripe pattern that corresponding spatial frequency values 12 are shown is
2%, the contrast value for the initial stripe pattern that corresponding spatial frequency values 6 are shown is 0.6%, what corresponding spatial frequency values 3 were shown
The contrast value of initial stripe pattern is 0.6%, and the contrast value for the initial stripe pattern that corresponding spatial frequency values 1.5 are shown is
3%.
Preferably, the display module includes that spatial frequency values are respectively to the stripe pattern that user's vision system is shown
18,12,6,3,1.5 stripe pattern, the stripe pattern that the display module is shown to user's vision system include that correspondence is each
The contrast value of spatial frequency values is respectively 20%, 10%, 8%, 6%, 4%, 3%, 2%, 1%, 0.8%, 0.6%,
0.4%, 0.3% stripe pattern.
Preferably, described default to comment value standard are as follows: corresponding contrast value is respectively 20%, 10%, 8%, 6%, 4%,
3%, 2%, 1%, 0.8%, 0.6%, 0.4%, 0.3% stripe pattern, the contrast sensitivity function value being corresponding in turn to is respectively 5,
10、12.5、16.7、25、33.4、50、100、125、167、250、334。
Preferably, the data processing module is specifically used for exporting the contrast sensitivity function value and spatial frequency values measured
Variation relation curve, the abscissa representation space frequency values of the curve, ordinate indicate contrast sensitivity function value.
As shown from the above technical solution, a kind of device measuring vision system contrast sensitivity provided by the present invention includes
Display module, receiving module and data processing module, wherein display module shows there is pre-set space to the vision system of user
The stripe pattern of frequency and default contrast, receiving module be used to receive user's input for selecting shown stripe pattern
The instruction in direction, data processing module are used for when the direction that user selects is consistent with the direction of shown stripe pattern, record
The spatial frequency values and contrast value of shown stripe pattern, and comment value standard to obtain corresponding shown stripe pattern according to default
Contrast sensitivity function value, and the variation relation of contrast sensitivity function value and spatial frequency values measured according to record data output,
To measure the contrast sensitivity situation for obtaining user's vision system.Therefore, the present invention measures vision system contrast sensitivity
Device realizes the contrast sensitivity situation of measurement vision system, solves problem of the prior art.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is a kind of schematic device for measuring vision system contrast sensitivity provided in an embodiment of the present invention；
Fig. 2 is the schematic diagram of display module in an embodiment of the present invention；
Fig. 3 is the schematic diagram of display module in another embodiment of the invention；
Fig. 4 (a) is the stripe pattern in vertical 90 degree of directions in one embodiment of the invention；
Fig. 4 (b) is the stripe pattern in 45 degree of directions clockwise in one embodiment of the invention；
Fig. 4 (c) is the stripe pattern in 45 degree of directions counterclockwise in one embodiment of the invention.
Specific embodiment
Technical solution in order to enable those skilled in the art to better understand the present invention, below in conjunction with of the invention real
The attached drawing in example is applied, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described implementation
Example is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is common
Technical staff's every other embodiment obtained without making creative work, all should belong to protection of the present invention
Range.
Referring to FIG. 1, Fig. 1 is a kind of device signal for measuring vision system contrast sensitivity provided in an embodiment of the present invention
Figure, as seen from the figure, described device includes:
Display module 10, for showing the striped with pre-set space frequency and default contrast to the vision system of user
Image；
Receiving module 11, the instruction in the direction for selecting shown stripe pattern for receiving user's input are described
The direction of stripe pattern refers to the direction of striped in image；
Data processing module 12, when the direction for selecting as user is consistent with the direction of shown stripe pattern, record
The spatial frequency values and contrast value of shown stripe pattern, and comment value standard to obtain corresponding shown stripe pattern according to default
Contrast sensitivity function value, and the variation relation of contrast sensitivity function value and spatial frequency values measured according to record data output.
Wherein, stripe pattern refers to that, with the alternately arranged image of the striped of two kinds of different pixel values, which has
Stable spatial frequency and contrast, and there is determining stripe direction.
The present embodiment measures the device of vision system contrast sensitivity by showing there is default sky to user's vision system
Between frequency and default contrast stripe pattern, according to the user's choice, according to the spatial frequency values of shown stripe pattern and
Contrast value and provide corresponding contrast sensitivity function value, measurement obtain the variation relation of contrast sensitivity function value and spatial frequency values,
To measure the contrast sensitivity situation for obtaining user's vision system.Therefore, the present embodiment measures vision system contrast sensitivity
Device realize measurement vision system contrast sensitivity situation, solve problem of the prior art.
In one embodiment, referring to FIG. 2, showing mould in the device of the measurement vision system contrast sensitivity
Block 10 includes showing interface 100, first control unit 101, the second control unit 102 and judging unit 103.
The displaying interface 100 is used to show stripe pattern to the vision system of user.
The first control unit 101 is used to control sequence of the displaying interface 100 with spatial frequency values from big to small,
The stripe pattern with different space frequency value is in turn shown to user's vision system.
Second control unit 102 for controlling the displayings interface 100 correspondence the same space frequency values, in turn to
User's vision system shows stripe pattern with the spatial frequency values, with different contrast value.
The judging unit 103 is used to judge whether the direction of user's selection to be consistent with the direction of shown stripe pattern.
Further specifically, if second control unit 102 is specifically used for the direction and shown striped that user selects
The direction of image is consistent, then controls the displaying interface 100 and show next stripe pattern, the spatial frequency of next stripe pattern
Value is identical with the spatial frequency values of current fringes image, and the contrast value of next stripe pattern is less than pair of current fringes image
Compare angle value.
User is directed to the stripe pattern of current presentation, judges the direction of shown stripe pattern, that is, judges to show image
The direction of middle striped, and pass through the instruction of the input choice direction of receiving module 11.Judging unit 103 according to the user's choice, is sentenced
Whether the direction of disconnected user's selection and the actual direction for showing the shown stripe pattern in interface 100 are consistent, if unanimously, indicating to use
Family is correct to the walking direction of current shown stripe pattern, then it is next to show that interface 100 is shown for the control of the second control unit 102
Stripe pattern, next stripe pattern spatial frequency values compared with current fringes image are constant, and contrast value reduces, and carried out by user
Identification.Stripe pattern until corresponding to the different contrast of the spatial frequency is all tested or user identifies that mistake occurs in direction
Accidentally.
If the first control unit 101 is different specifically for the direction of user's selection and the direction of shown stripe pattern
It causes, then controls the displaying interface 100 and show next stripe pattern, the spatial frequency values of next stripe pattern, which are less than, works as preceding article
The spatial frequency values of print image.
If user is directed to the stripe pattern of current presentation, the instruction of choice direction is inputted by receiving module 11.And user
The direction of selection and the actual direction for the stripe pattern that displaying interface 100 is shown are inconsistent, i.e. item of the user to current presentation
The walking direction mistake of print image, then the control of first control unit 101 shows that interface 100 shows next stripe pattern, next
The spatial frequency values of print image reduce, and user is made to start to identify the stripe pattern of next stage spatial frequency.Until user
The stripe pattern of preset various spatial frequency values is all tested.
In another embodiment, referring to FIG. 3, being shown in the device of the measurement vision system contrast sensitivity
Module 10 includes showing that interface 200, first control unit 201, the second control unit 202, third control unit 203 and judgement are single
Member 204.
The displaying interface 200 is used to show stripe pattern to the vision system of user.
The first control unit 201 is used to control sequence of the displaying interface 200 with spatial frequency values from big to small,
The stripe pattern with different space frequency value is in turn shown to user's vision system.
Second control unit 202 for controlling the displayings interface 200 correspondence the same space frequency values, in turn to
User's vision system shows stripe pattern with the spatial frequency values, with different contrast value.
The third control unit 203 is for controlling the corresponding the same space frequency values in the displaying interface 200 and with a pair of
Than angle value, in turn showing to user's vision system has a not Tongfang of the preset quantity of the spatial frequency values and the contrast value
To stripe pattern, the preset quantity be more than or equal to three.
The judging unit 204 is used to judge whether the direction of user's selection to be consistent with the direction of shown stripe pattern.
Further specifically, if second control unit 202 is same specifically for the correspondence shown to user's vision system
In the stripe pattern of the preset quantity different directions of one spatial frequency values and same contrast value, there is at least two users selection
Direction it is consistent with the direction of shown stripe pattern, then control the displaying interface 200 and show next stripe pattern, this is next
The spatial frequency values of stripe pattern are identical with the spatial frequency values of current fringes image, and the contrast value of next stripe pattern is small
In the contrast value of current fringes image.
This measuring device, corresponding the same space frequency values and same contrast value, can by show interface 200 in turn to
User's vision system shows the stripe pattern with the preset quantity different directions of the spatial frequency values and the contrast value, by
User successively identifies and judges.If the bar graph in multiple and different directions of corresponding the same space frequency values and same contrast value
Picture, user being capable of correct judgments therein at least two, then it is assumed that user's vision system can correctly judge with the space
The striped of frequency values and the contrast value, then the control of the second control unit 202 shows that interface 200 shows next stripe pattern, under
One stripe pattern spatial frequency values compared with current fringes image are constant, and contrast value reduces, and identified by user, until right
The stripe pattern of the different contrast of the spatial frequency is all tested or is occurred user and identifies that correct amount of images is zero, and
The stripe pattern of next stage space frequency is identified.
If second control unit 202 is also particularly useful for the correspondence the same space frequency values shown to user's vision system
In the stripe pattern of the preset quantity different directions of same contrast value, only one user selection direction with shown
The direction of stripe pattern is consistent, then controls the displaying interface 200 and show next stripe pattern, the space of next stripe pattern
Frequency values are identical with the spatial frequency values of current fringes image, and the contrast value of next stripe pattern is greater than current fringes image
Contrast value.
If user is for showing that interface 200 successively shows default with the same space frequency values and same contrast value
The stripe pattern of quantity different directions is identified and judgeed, wherein correct judgment one and remaining all judges incorrectly, then
The control of second control unit 202 shows that interface 200 shows next stripe pattern, and next stripe pattern is compared with current fringes image
Spatial frequency values are constant, and contrast value increases, and identified by user, until the stripe pattern of the different contrast to the spatial frequency
It tests or user occurs and identify that correct amount of images is zero, and the stripe pattern of next stage space frequency is identified.
If the first control unit 201 be specifically used for the correspondence the same space frequency values that are shown to user's vision system with
In the stripe pattern of the preset quantity different directions of same contrast value, there is not the direction of user's selection and shown item
The direction of print image is consistent, then controls the displaying interface 200 and show next stripe pattern, the space frequency of next stripe pattern
Rate value is less than the spatial frequency values of current fringes image.
If user is for showing that interface 200 successively shows default with the same space frequency values and same contrast value
The stripe pattern of quantity different directions is identified and judgeed, wherein then first control unit 202 is controlled all without correct judgment
System shows that interface 200 shows next stripe pattern, and next stripe pattern spatial frequency values compared with current fringes image reduce, i.e.,
Start to test the stripe pattern of next stage spatial frequency.
In the specific implementation, optionally, it is corresponding same to be specifically used for the control displaying interface 200 for third control unit 203
One spatial frequency values and same contrast value in turn show there is the spatial frequency values and the contrast to user's vision system
The stripe pattern of three different directions of value, three different directions include vertical 90 degree of directions, 45 degree of directions clockwise and inverse time
45 degree of directions of needle.Fig. 4 (a), Fig. 4 (b) and Fig. 4 (c) are specifically referred to, Fig. 4 (a) is the stripe pattern in vertical 90 degree of directions, Fig. 4
It (b) is the stripe pattern in 45 degree of directions clockwise, Fig. 4 (c) is the stripe pattern in 45 degree of directions counterclockwise.But not limited to this,
In other embodiments of the present invention, the same space frequency values can be corresponded to and same contrast value shows three or more different directions
Stripe pattern, the quantity of different directions can be according to measurement demand flexible setting in practical applications.In addition, stripe pattern is not
It is equidirectional can also be with flexible setting, also all in the scope of the present invention.
Further specifically, in the device of the measurement vision system contrast sensitivity of above each embodiment description, the
Two control units are specifically used for controlling the contrast for showing interface and corresponding to the initial stripe pattern of the displaying of spatial frequency values 18
Value is 20%, and the contrast value for the initial stripe pattern that corresponding spatial frequency values 12 are shown is 2%, and corresponding spatial frequency values 6 are opened up
The contrast value of the initial stripe pattern shown is 0.6%, the contrast value for the initial stripe pattern that corresponding spatial frequency values 3 are shown
It is 0.6%, the contrast value for the initial stripe pattern that corresponding spatial frequency values 1.5 are shown is 3%.That is, when starting to space frequency
Corresponding to first image that the spatial frequency values are shown when the stripe pattern test of rate value 18 is the striped that contrast value is 20%
Image, corresponding to first image that the spatial frequency values are shown when starting the stripe pattern test to spatial frequency values 12 is pair
Than the stripe pattern that angle value is 2%, when first image for starting to show when the stripe pattern test to spatial frequency values 6 is pair
Than the stripe pattern that angle value is 0.6%, when first image for starting to show when the stripe pattern test to spatial frequency values 3 is
The stripe pattern that contrast value is 0.6%, when first figure for starting to show when the stripe pattern test to spatial frequency values 1.5
Picture is the stripe pattern that contrast value is 3%.
Further specifically, display module 10 is to user in the device of the present embodiment measurement vision system contrast sensitivity
The stripe pattern that vision system is shown includes the stripe pattern that spatial frequency values are respectively 18,12,6,3,1.5, the displaying mould
Block 10 to the contrast value that the stripe pattern that user's vision system is shown includes corresponding each spatial frequency values be respectively 20%,
10%, 8%, 6%, 4%, 3%, 2%, 1%, 0.8%, 0.6%, 0.4%, 0.3% stripe pattern.
In the specific implementation, optionally, it is described it is default comment value standard may is that corresponding contrast value be respectively 20%,
10%, 8%, 6%, 4%, 3%, 2%, 1%, 0.8%, 0.6%, 0.4%, 0.3% stripe pattern, the comparison being corresponding in turn to
Sensitivity value is respectively 5,10,12.5,16.7,25,33.4,50,100,125,167,250,334.
Further specifically, data processing module 12 has in the device of the present embodiment measurement vision system contrast sensitivity
Body is used to export the variation relation curve of the contrast sensitivity function value and spatial frequency values measured, and the abscissa of the curve indicates empty
Between frequency values, ordinate indicate contrast sensitivity function value.
Optionally, the displaying interface can be liquid crystal display.
The settable key for indicating direction of receiving module 11 inputs instruction choosing to receiving module when key is pressed
Select the instruction in the corresponding mark direction of the key.
The device of measurement vision system contrast sensitivity provided by the present invention is described in detail above.Herein
Apply that a specific example illustrates the principle and implementation of the invention, the explanation of above example is only intended to help
Understand method and its core concept of the invention.It should be pointed out that for those skilled in the art, not taking off
, can be with several improvements and modifications are made to the present invention under the premise of from the principle of the invention, these improvement and modification also fall into this
In invention scope of protection of the claims.
Claims (10)
1. a kind of device for measuring vision system contrast sensitivity characterized by comprising
Display module, for showing the stripe pattern with pre-set space frequency and default contrast to the vision system of user；
Receiving module, the instruction in the direction for selecting shown stripe pattern for receiving user's input, the bar graph
The direction of picture refers to the direction of striped in image；
Data processing module, when the direction for selecting as user is consistent with the direction of shown stripe pattern, record is shown
The spatial frequency values and contrast value of stripe pattern, and according to the default comparison for commenting value standard to obtain corresponding shown stripe pattern
Sensitivity value, and the variation relation for the contrast sensitivity function value and spatial frequency values measured according to record data output.
2. the device of measurement vision system contrast sensitivity according to claim 1, which is characterized in that the display module
Including showing interface, first control unit and the second control unit；
The displaying interface is used to show stripe pattern to the vision system of user；
The first control unit is used to control the sequence of the displaying interface with spatial frequency values from big to small, in turn to
Family vision system shows the stripe pattern with different space frequency value；
Second control unit corresponds to the same space frequency values for controlling the displaying interface, in turn to user's vision system
System shows stripe pattern with the spatial frequency values, with different contrast value.
3. the device of measurement vision system contrast sensitivity according to claim 2, which is characterized in that the display module
Further include judging unit, the judging unit be used for judge user selection direction and shown stripe pattern direction whether one
It causes；
If the direction that second control unit is specifically used for user's selection is consistent with the direction of shown stripe pattern, control
The lower stripe pattern of displaying showing interface, the spatial frequency values of next stripe pattern and the space frequency of current fringes image
Rate value is identical, and the contrast value of next stripe pattern is less than the contrast value of current fringes image；
If the first control unit is inconsistent specifically for the direction of user's selection and the direction of shown stripe pattern, control
The lower stripe pattern of displaying showing interface is made, the spatial frequency values of next stripe pattern are less than the sky of current fringes image
Between frequency values.
4. the device of measurement vision system contrast sensitivity according to claim 2, which is characterized in that the display module
Further include third control unit, the third control unit for control the displayings interface correspond to the same space frequency values and together
One contrast value, in turn showing to user's vision system has the preset quantity of the spatial frequency values and the contrast value a not
Equidirectional stripe pattern, the preset quantity are more than or equal to three.
5. the device of measurement vision system contrast sensitivity according to claim 4, which is characterized in that the display module
Further include judging unit, the judging unit be used for judge user selection direction and shown stripe pattern direction whether one
It causes；
If second control unit is specifically used for the correspondence the same space frequency values shown to user's vision system and with a pair of
The direction for thering are at least two users to select in stripe pattern than the preset quantity different directions of angle value and shown bar graph
The direction of picture is consistent, then controls the lower stripe pattern of displaying showing interface, the spatial frequency values of next stripe pattern and
The spatial frequency values of current fringes image are identical, and the contrast value of next stripe pattern is less than the contrast of current fringes image
Value；
If second control unit is also particularly useful for the correspondence the same space frequency values that show to user's vision system and same
In the stripe pattern of the preset quantity different directions of contrast value, the direction of only one user selection and shown bar graph
The direction of picture is consistent, then controls the lower stripe pattern of displaying showing interface, the spatial frequency values of next stripe pattern and
The spatial frequency values of current fringes image are identical, and the contrast value of next stripe pattern is greater than the contrast of current fringes image
Value；
If the first control unit is specifically used for the correspondence the same space frequency values shown to user's vision system and with a pair of
In stripe pattern than the preset quantity different directions of angle value, there is not the direction of user's selection and shown stripe pattern
Direction it is consistent, then control the lower stripe pattern of displaying showing interface, the spatial frequency values of next stripe pattern are less than
The spatial frequency values of current fringes image.
6. the device of measurement vision system contrast sensitivity according to claim 4, which is characterized in that the third control
Unit is specifically used for the control displaying interface and corresponds to the same space frequency values and same contrast value, in turn to user's vision
System demonstration has the stripe pattern of the spatial frequency values and three different directions of the contrast value, and three different directions include
Vertical 90 degree of directions, 45 degree of directions clockwise and 45 degree of directions counterclockwise.
7. according to the device of the described in any item measurement vision system contrast sensitivity of claim 2-6, which is characterized in that described
Second control unit is specifically used for controlling the comparison for showing interface and corresponding to the initial stripe pattern of the displaying of spatial frequency values 18
Angle value is 20%, and the contrast value for the initial stripe pattern that corresponding spatial frequency values 12 are shown is 2%, corresponding spatial frequency values 6
The contrast value of the initial stripe pattern shown is 0.6%, the contrast for the initial stripe pattern that corresponding spatial frequency values 3 are shown
Value is 0.6%, and the contrast value for the initial stripe pattern that corresponding spatial frequency values 1.5 are shown is 3%.
8. the device of measurement vision system contrast sensitivity according to claim 1-6, which is characterized in that described
Display module is to the bar graph that the stripe pattern that user's vision system is shown includes that spatial frequency values are respectively 18,12,6,3,1.5
Picture, the display module divide to the contrast value that the stripe pattern that user's vision system is shown includes corresponding each spatial frequency values
Not Wei 20%, 10%, 8%, 6%, 4%, 3%, 2%, 1%, 0.8%, 0.6%, 0.4%, 0.3% stripe pattern.
9. the device of measurement vision system contrast sensitivity according to claim 1, which is characterized in that described preset comments value
Standard are as follows: corresponding contrast value is respectively 20%, 10%, 8%, 6%, 4%, 3%, 2%, 1%, 0.8%, 0.6%, 0.4%,
0.3% stripe pattern, the contrast sensitivity function value being corresponding in turn to is respectively 5,10,12.5,16.7,25,33.4,50,100,
125、167、250、334。
10. the device of measurement vision system contrast sensitivity according to claim 1, which is characterized in that at the data
Reason module is specifically used for the variation relation curve of contrast sensitivity function value and spatial frequency values that output is measured, the horizontal seat of the curve
Representation space frequency values are marked, ordinate indicates contrast sensitivity function value.
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| CN109966130A (en) * | 2019-05-13 | 2019-07-05 | 广州视景医疗软件有限公司 | The method and its system of a kind of eyes comparison degree of balance measurement during visual performance is trained |
| CN112842248A (en) * | 2020-12-31 | 2021-05-28 | 北京大学第三医院（北京大学第三临床医学院） | Dynamic contrast sensitivity test system and test method thereof |
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