Visual inspection device, visual inspection system, and visual inspection program

Abstract

Provided is a visual inspection device having a touch screen, which displays, on the touch screen, in succession, during a period from the start to the end of an inspection, an optotype in a state in which the position on the touch screen is fixed, and obtains an inspection result based on the result of whether or not the subject has clicked the optotype.

Description

TECHNICAL FIELD

[0001] The present application relates to a visual inspection device, a visual inspection system, and a visual inspection program. BACKGROUND

[0002] As one of visual inspections, a so-called visual field test that inspects visual field defects in glaucoma is known. For example, a visual inspection device that uses an HMD and answers by operating a switch in response thereto as in Patent Literature 1 is known. In addition, a technique that monitors visual field defects in glaucoma by using a touch panel as in Patent Literature 2 is known.

[0003] PRIOR ART DOCUMENTS

[0004] PATENT LITERATURE

[0005] Patent Literature 1: Japanese Patent Application Publication No. 2017-000224

[0006] Patent Literature 2: Japanese Patent Application Publication No. 2015-502238 SUMMARY

[0007] PROBLEMS TO BE SOLVED BY THE INVENTION

[0008] In the content described in Patent Literature 2, during a period from the start to the end of the inspection, the inspection is completed by repeating the following operations: the system selects a target displayed on the touch panel, the target is set as a fixation target after the subject has captured the target, and the system selects another target. That is, dynamic fixation that does not fix the fixation target to one point on the touch panel is adopted (paragraphs 0024, 0054, and the like).

[0009] When dynamic fixation is adopted, in order to grasp the state of the visual field defect, it is necessary to convert the test result into a case where the initial position of the subject's line of sight is at one position (for example, the center) on the touch panel. In addition, after taking this conversion into account, it is necessary to configure the targets in advance to prescribed positions on the touch panel.

[0010] The main object of the present application is to provide a technique that performs visual inspection without conversion processing of the test result under dynamic fixation.

[0011] SOLUTION TO THE PROBLEM

[0012] The first aspect is a visual inspection device that has a touch panel, displays an optotype on the touch panel in a state where a fixation target whose position on the touch panel is fixed is displayed, in order, during a period from the start to the end of the inspection, and obtains an inspection result based on a result of whether or not the subject has clicked the optotype.

[0013] The second method is a method in which, in the method described in the first method, the number of times of presenting the fixation target to the examinee is plural during the period from the start to the end of the examination.

[0014] The third method is a method in which, in the method described in the first method or the second method, a standby position marker of the hand is further provided, the standby position marker being used to avoid the hand of the examinee being continuously disposed between the examinee and the touch screen.

[0015] The fourth method is a visual inspection system in which, during the period from the start to the end of the examination, fixation targets are sequentially displayed on the touch screen in a state in which the positions on the touch screen are fixed, and an examination result is obtained based on the result of whether or not the examinee has clicked on the fixation targets.

[0016] The fifth method is a visual inspection program that causes a computer to function as follows: in an examination, fixation targets are sequentially displayed on a touch screen in a state in which the positions on the touch screen are fixed, and an examination result is obtained based on the result of whether or not the examinee has clicked on the fixation targets.

[0017] Other methods that can be combined with the above-described methods are as follows.

[0018] The number of fixation targets displayed at a time on the touch screen can be one or plural. The number of fixation targets displayed at a time can be changed at least once during the period from the start to the end of the examination when the fixation targets are presented to the examinee plural times. On the other hand, the number of fixation targets can be kept constant at one or plural during the period from the start to the end of the examination, or the number of fixation targets can be changed during the period from the start to the end of the examination, for example, the number of fixation targets at the first time of presentation of the fixation targets is one, the number of fixation targets at the second time is two, and the number of fixation targets at the third time is three. These modes can be combined. Furthermore, it is preferable that, in the case where the examinee is presented with plural fixation targets, the examinee is considered to have given a correct reply when the examinee has clicked on all of the presented fixation targets.

[0019] The click sensitivity of the fixation targets can be changed according to the eccentricity of the fixation targets with respect to the center of the touch screen.

[0020] For example, the greater the eccentricity, the greater the degree of expansion of the click determination function assigned to the pixels of the fixation targets can be expanded to the pixels around the fixation targets.

[0021] The click determination function assigned to the pixel of the target can also be extended to the pixels around the target to increase the click sensitivity. Furthermore, the more the number of pixels from the central pixel of the touch screen to the pixel of the target, the more the extension degree at that time can be increased.

[0022] As a specific way of increasing the extension degree, the range to which the click determination function is assigned can be defined according to the number of pixels from the pixel of the target. For example, the number of pixels from the central pixel of the touch screen can be divided into three levels of less, medium, and more, in the case of "less", the click determination function is assigned only to the pixel of the target, in the case of "medium", the click determination function is also assigned to the surrounding one pixel amount of the pixel surrounding the target, and in the case of "more", the click determination function is also assigned to the surrounding two pixel amount of the pixel surrounding the target. Furthermore, the present application is not limited to this way, and the number of extended pixels is not limited.

[0023] If an example using a numerical value is cited, considering the relationship between the eccentricity (angle of view) and the visual acuity, it is desirable that in the case of the number of pixels corresponding to the eccentricity (angle of view) of 20°, the area of the number of extended pixels to which the click determination function is assigned is about 4 times compared to the case of the number of pixels corresponding to the eccentricity (angle of view) of 10°.

[0024] The visual inspection apparatus can also have an operation unit that operates the degree of variation in the click sensitivity according to the eccentricity of the target. The operation unit can also utilize the operation function of the known tablet terminal. The operation function can also be controlled by the control unit of the known tablet terminal.

[0025] The visual inspection apparatus can also have a click sensitivity adjustment unit that reflects the degree of variation in the click sensitivity to the touch screen. The click sensitivity adjustment unit can also be configured to function as the operation unit. The click sensitivity function can also be controlled by the control unit of the known tablet terminal.

[0026] The attention degree of the target can also be varied according to the eccentricity of the target with respect to the center of the touch screen.

[0027] The "attention degree of the target" refers to the degree to which the subject easily visually recognizes the target. "Varying the attention degree of the target" refers to varying the degree to which the subject easily visually recognizes the target.

[0028] The greater the eccentricity, the more the attention degree of the target can be increased,

[0029] The attention degree of the target can be increased by increasing the contrast, brightness, or size of the target, or increasing the presentation time of the target, or a combination of any of them.

[0030] As a specific example of varying the attention degree of the visual target, increasing the contrast, brightness, or size of the visual target, or increasing the presentation time of the visual target, or combining any of them can be listed.

[0031] In a case where the brightness of the visual target is increased in order to increase the attention degree of the visual target, as shown in Figure 4 the brightness of the visual target B having a moderate eccentricity is increased compared to the visual target A having a small eccentricity. Similarly, the brightness of the visual target C having a large eccentricity is increased compared to the visual target B having a moderate eccentricity.

[0032] If an example using numerical values is listed, with respect to the contrast and brightness, considering the relationship between the eccentricity and the human feeling, it is desirable that the contrast is increased by about 6 dB ± 4 dB (2 dB to 10 dB) or so in the case where the eccentricity is 20 pixel numbers compared to the case where the eccentricity is 10 pixel numbers.

[0033] In addition, with respect to the presentation time, it is desirable that the presentation time is increased by about 2 ± 0.5 times (1.5 to 2.5 times) or so in the case where the eccentricity is 20 pixel numbers compared to the case where the eccentricity is 10 pixel numbers.

[0034] Further, for the case where the contrast and / or size of the visual target is increased, and / or the presentation time of the visual target is increased, as other specific examples of increasing the attention degree of the visual target, replacing "brightness" in the above paragraph with "contrast, size of the visual target, and / or presentation time of the visual target" is sufficient.

[0035] The visual inspection device can also have an operation unit that operates the degree of variation of the attention degree according to the eccentricity of the visual target. The operation unit can also utilize the operation function of the known tablet terminal. The operation function can also be controlled by the control unit of the known tablet terminal.

[0036] The visual inspection device can also have an attention degree adjustment unit that reflects the degree of variation of the attention degree to the touch screen. The attention degree adjustment unit can also be configured to be shared with the operation unit. The attention degree function can also be controlled by the control unit of the known tablet terminal.

[0037] The tablet terminal as a computer can also have a display unit, an input unit, and a control unit. It is preferable that the tablet terminal functions as the fixation target display unit, the visual target display unit, the click detection unit, the operation unit, the adjustment unit (click sensitivity, attention degree adjustment unit, and / or reply time limit), by executing a predetermined program by the control unit.

[0038] The visual inspection device has a touchscreen that, from the start to the end of the inspection, presents visual targets to the subject in a state where the position of the target on the touchscreen is fixed, allowing the subject to tap the target within a response time limit.

[0039] The time limit for responding to the examinee when the visual target is presented multiple times during the period from the start to the end of the examination can be set to be variable for each instance.

[0040] Alternatively, the response time limit can be set to vary depending on the number of visual targets presented to the subject at one time during the period from the start to the end of the examination.

[0041] Preferably, the number of times the visual targets are presented at once is multiple, and the correct response is considered when the subject clicks on all the presented visual targets.

[0042] The response time limit can also be set to be adjustable based on the response time required by respondents in the past.

[0043] The effects of the invention

[0044] According to the present invention, visual inspection can be performed without performing conversion processing of test results under dynamic fixation. Attached Figure Description

[0045] Figure 1 This is a summary diagram of the visual inspection device in this embodiment when the target is displayed on the touch screen.

[0046] Figure 2 This diagram illustrates a method for counting the number of pixels starting from the center pixel of the touchscreen of the visual inspection device according to this embodiment.

[0047] Figure 3 This describes how the eccentricity of the target in the visual inspection device of this embodiment is divided into small ( Figure 3 (a) of, medium ( Figure 3 (b) of, large ( Figure 3 The diagram shows the configuration of the viewpoint and click determination function for the three levels (c).

[0048] Figure 4 This describes how the eccentricity of the target in the visual inspection device of this embodiment is divided into small ( Figure 4 (a) of, medium ( Figure 4 (b) of, large ( Figure 4 The graph shows the different brightness of the target at the three levels (c).

[0049] Figure 5Fig. 10 is a diagram showing a case where the reply restriction time is varied depending on the number of the targets displayed at a time in the visual inspection apparatus of the present embodiment.

[0050] Figure 6 Fig. 11 is a block diagram showing the structure of a control system of the visual inspection apparatus of the present embodiment.

[0051] Figure 7 Fig. 10(a) is a diagram showing a case where the hand of the examinee is continuously disposed between the examinee and the touch screen when the examinee is presented with the targets in the visual inspection apparatus of the present embodiment, Figure 7 Fig. 10(b) is a diagram showing a case where the standby position mark of the hand is set and the examinee complies with the mark. DETAILED DESCRIPTION

[0052] Hereinafter, an embodiment of the present application will be described. In the present embodiment, a case where the visual inspection apparatus is a perimetry will be exemplified.

[0053] In the present embodiment, a case where the visual inspection apparatus is a tablet terminal will be described. The visual inspection apparatus of the present embodiment has a touch screen that presents the examinee with the targets to make the examinee click the targets. The touch screen includes the display surface of the tablet terminal.

[0054] The "target" described herein refers to content displayed in order to apply a stimulus caused by light to the eyeball of the examinee when the vision of the examinee is inspected. The size, shape, and the like of the target are not particularly limited. For example, in glaucoma inspection, by displaying a light point as a target with a prescribed size and varying the position of the light point, it is possible to inspect (determine) the presence or absence of a defective visual field, a defective site.

[0055] A pixel of the target is given a click determination function. The "click determination function" refers to a function of determining a correct reply when the examinee clicks and presses a pixel portion of the target displayed on the touch screen, in detail, a pixel portion displayed on the touch screen with a higher luminance than the surrounding luminance. The click determination function can also be referred to as a hit determination function. The "correct reply" described herein refers to a case where the examinee can visually recognize the target in a prescribed visual field. In a case where the pixel of the target given the click determination function does not sense pressure within a fixed time, the visual inspection apparatus determines an incorrect reply. The "incorrect reply" described herein refers to a case where the examinee cannot visually recognize the target in a prescribed visual field.

[0056] The number of the targets displayed at a time on the touch screen can be one or plural. The number of the targets displayed at a time can be changed at least once during the period from the start to the end of the examination while the targets are presented to the examinee plural times. On the other hand, the number of the targets can be kept one or plural during the period from the start to the end of the examination. For example, the number of the targets can be changed during the period from the start to the end of the examination, such as one at the first target presentation, two at the second target presentation, and three at the third target presentation. Further, it is preferable that, in the case where plural targets are presented to the examinee, the examinee clicks all of the plural targets.

[0057] Figure 1 Fig. 1 is a diagram showing an outline when the targets are displayed on the touch screen of the visual inspection apparatus of the present embodiment.

[0058] In the case of using a tablet terminal, the function as hardware can be used by an existing tablet terminal (smartphone, tablet computer, etc.). The present embodiment can also be implemented by a program for adjusting a function related to the click sensitivity of the tablet terminal.

[0059] The following describes preferred examples of the present embodiment.

[0060] (Click sensitivity)

[0061] One of the features of the present embodiment is to change the click sensitivity of the targets according to the eccentricity of the targets with respect to the fixation target.

[0062] The pixel at the center of the touch screen is generally a pixel constituting the fixation target. During the period from the start to the end of the examination, the targets are displayed on the touch screen in a state where the position on the touch screen is fixed (as an example, the central position on the touch screen. The case is exemplified below. However, a position other than this is not excluded). The examinee clicks the presented targets in a state where the fixation target is fixed. The examination result is obtained based on the result of whether the examinee clicked the targets. The shape of the fixation target is arbitrary and can be a cross, but for the sake of explanation, the fixation target is also displayed by a dot in the present specification. Further, the fixation target can be always displayed on the touch screen or can be flickeringly displayed. The "state where the fixation target is displayed" includes an arbitrary state. Ultimately, as long as the examinee can fix the fixation target when the examinee clicks the targets, the display method of the fixation target is not limited.

[0063] The "eccentricity of the visual target from the center of the touch screen" refers to the degree of remoteness of the visual target from the center of the touch screen up to the endmost portion and the most remote portion of the display limit of the touch screen or the portion used at the time of visual inspection in the touch screen.

[0064] This "eccentricity" can be expressed by the number of pixels (i.e., the absolute number) from the pixel at the center of the touch screen up to the pixel of the visual target (the counting method of the number of pixels will be described later) or by the ratio (i.e., the relative number) of the number of pixels from the pixel at the center of the touch screen up to the pixel of the visual target among the pixels from the pixel at the center of the touch screen up to the endmost portion and the most remote portion of the display limit of the touch screen or the portion used at the time of visual inspection in the touch screen. Hereinafter, the eccentricity includes both the absolute number and the relative number. In addition, the "eccentricity" can also be expressed by the angle (i.e., the visual angle) between the line of sight toward the pixel at the center of the touch screen and the line of sight toward the prescribed pixel. In this case, it is described as the eccentricity (visual angle).

[0065] In the case of using the touch screen, the central portion of the touch screen is easy to touch for the examinee, and the end portion of the touch screen is difficult to touch. On the other hand, by adopting this structure, it is possible to fill the difference in operability between the central portion and the edge portion with the difference in click sensitivity of the visual target on the touch screen between the central portion and the end portion. As a result, it is possible to improve the inspection accuracy in the case of using the touch screen.

[0066] One specific example of setting the difference in click sensitivity between the central portion and the end portion is as follows. The present application is not limited to the following specific example.

[0067] For example, it can be that the larger the eccentricity, the more the degree of expansion when the click determination function given to the pixel of the visual target is also expanded to the pixels around the visual target increases.

[0068] Figure 2 is a diagram illustrating a counting method of the number of pixels from the pixel at the center of the touch screen of the visual inspection apparatus of the present embodiment.

[0069] As one example of the counting method of the "number of pixels from the pixel at the center of the touch screen up to the pixel of the visual target", it can be the number of pixels passing through the shortest straight line from the pixel at the center of the touch screen up to the pixel including the center of the visual target displayed on the touch screen (1 in Figure 2 ), or it can be that the number of pixels up to the pixel including the center of the visual target is aggregated (2 in Figure 2 ).

[0070] In order to increase the click sensitivity, the click determination function imparted to the pixel of the visual marker can also be imparted to the pixels around the visual marker. Also, the more the number of pixels from the pixel at the center of the touch panel to the pixel of the visual marker, the more the degree of expansion can be increased.

[0071] Figure 3 is a diagram illustrating a configuration of a visual marker and a click determination function imparting region when the eccentricity of the visual marker of the visual inspection apparatus of the present embodiment is classified into three levels of small (a), medium (b), and large (c). Figure 3 Figure 3 Figure 3

[0072] As a specific way of increasing the degree of expansion, the range to which the click determination function is imparted can also be defined by the number of pixels from the pixel of the visual marker. For example, the number of pixels from the pixel at the center of the touch panel can be classified into three levels of small, medium, and large, in the case of "small" the click determination function is imparted only to the pixel of the visual marker, in the case of "medium" the click determination function is also imparted to the pixels around the pixel of the visual marker by one pixel, and in the case of "large" the click determination function is also imparted to the pixels around the pixel of the visual marker by two pixels.

[0073] If an example using numerical values is cited, considering the relationship between the eccentricity (angle of view) and the visual acuity, it is desirable that in the case of the number of pixels corresponding to the eccentricity (angle of view) of 20°, the area of the number of expanded pixels to which the click determination function is imparted is about 4 times as compared with the case of the number of pixels corresponding to the eccentricity (angle of view) of 10°.

[0074] Furthermore, the present application is not limited to these ways, and is not limited to the number of expanded pixels.

[0075] In addition to the above-described ways, the following way can also be adopted. For example, the degree of pressing required to exert the click determination function imparted to the pixel of the visual marker can be reduced according to the number of pixels from the pixel at the center of the touch panel, thereby increasing the click sensitivity. That is, it can be configured that the pixel of the visual marker displayed at the center of the touch panel does not exert the click determination function if it is not pressed sufficiently, on the other hand, the pixel of the visual marker displayed at the end portion of the touch panel exerts the click determination function only by a slight touch.

[0076] By adopting this configuration, the difference in operability between the central portion and the end portion of the touch panel can be filled in with the difference in click sensitivity of the visual marker on the touch panel between the central portion and the end portion. As a result, the inspection accuracy in the case of using the touch panel can be improved.

[0077] (Visual marker attention)

[0078] ​​​One of the features of the present embodiment is to vary the attention degree of the optotypes in accordance with the eccentricity of the optotypes with respect to the fixation target. The following contents not described below can be applied to the contents described in (click sensitivity).

[0079] The "attention degree of the optotypes" refers to the degree in which the examinee easily visually recognizes the optotypes. The "varying the attention degree of the optotypes" refers to varying the degree in which the examinee easily visually recognizes the optotypes.

[0080] As a specific example of varying the attention degree of the optotypes, it is possible to cite varying the contrast, brightness, or size of the optotypes, or varying the presentation time of the optotypes, or combining any of them.

[0081] The "eccentricity of the optotypes with respect to the center of the touch screen" refers to the degree of remoteness of the optotypes from the center of the touch screen to the display limit of the touch screen or the most distal portion of the portion used at the time of visual inspection in the touch screen.

[0082] In the case of using the touch screen, the central portion of the touch screen is easily visually recognized by the examinee, and the end portion of the touch screen is difficult to visually recognize. On the other hand, by adopting this structure, it is possible to fill the difference in the ease of visual recognition between the central portion and the end portion with the difference in the attention degree of the optotypes on the touch screen between the central portion and the end portion. As a result, it is possible to improve the inspection accuracy in the case of using the touch screen.

[0083] One specific example of setting the difference in the attention degree between the central portion and the edge portion is as follows. The present application is not limited to the following specific example.

[0084] Figure 4 is a graph illustrating the difference in the brightness of the optotypes when the eccentricity of the optotypes of the visual inspection apparatus of the present embodiment is divided into three levels of small (a), medium (b), and large (c). Figure 4 Figure 4 is a graph illustrating the difference in the brightness of the optotypes when the eccentricity of the optotypes of the visual inspection apparatus of the present embodiment is divided into three levels of small (a), medium (b), and large (c). Figure 4

[0085] It is preferable that the greater the eccentricity, the more the attention degree of the optotypes is increased, the contrast, brightness, or size of the optotypes is increased, or the presentation time of the optotypes is increased, or any of them is combined. In the case where the brightness of the optotypes is increased in order to increase the attention degree of the optotypes, as shown in Figure 4 the brightness of the optotype B having a medium eccentricity is increased compared to the optotype A having a small eccentricity. Similarly, the brightness of the optotype C having a large eccentricity is increased compared to the optotype B having a medium eccentricity.

[0086] ​​If an example of a numerical value is cited, in terms of contrast and brightness, it is expected that the contrast will be increased by about 6 dB ± 4 dB (2 dB to 10 dB) or so in the case of a 20-pixel eccentricity, as compared to the case of a 10-pixel eccentricity, taking into account the relationship between eccentricity and human perception.

[0087] In addition, in terms of presentation time, it is expected that the presentation time will be increased by about 2 ± 0.5 times (1.5 to 2.5 times) or so in the case of a 20-pixel eccentricity, as compared to the case of a 10-pixel eccentricity.

[0088] Further, in the case of increasing the contrast and / or size of the optotypes, and / or increasing the presentation time of the optotypes, as other specific examples of increasing the attention to the optotypes, the "brightness" in the previous paragraph is replaced with "contrast and / or size of the optotypes, and / or presentation time of the optotypes".

[0089] (Response Limit Time)

[0090] One of the features of the present embodiment is that the visual inspection device has a touch screen that presents an optotype to the examinee to cause the examinee to click on the optotype within a response limit time, and on this basis, the response limit time given to the examinee when the optotype is presented multiple times during the period from the start to the end of the inspection is variable at each time.

[0091] The "response limit time" refers to the time from the presentation of the optotype to the examinee to the time when the examinee is deemed to have given a correct response by pressing the optotype on the touch screen. If the optotype cannot be clicked within this time, it is deemed to be an incorrect response. Either another optotype can be presented to the examinee immediately after this time has elapsed, or the previous optotype can be temporarily not displayed and the other optotype can be presented to the examinee with an interval.

[0092] Specific ways of making the response limit time given to the examinee when the optotype is presented variable during the period from the start to the end of the inspection are cited.

[0093] The response limit time can be set to be able to change depending on the number of optotypes presented at a time when the optotype is presented to the examinee multiple times during the period from the start to the end of the inspection.

[0094] In this mode, the subject is presented with the visual target a plurality of times. Assume that the number of visual targets is set to one at the first presentation, while the number of visual targets is set to four at the second presentation, and the reply limit time is set to the same. There is a concern that the subject might not be able to click on the visual target at the second presentation even though the subject was able to click on the visual target at the first presentation. Therefore, the reply limit time is made longer at the second presentation than at the first presentation. Furthermore, how long to make the reply limit time longer can be appropriately set, but it can also be referred to the past reply time required by the subject (details are described later).

[0095] The number of visual targets presented at one time as described above is not limited. However, if the number of visual targets presented at one time is a plurality, the subject might not be able to click on the visual target when the present embodiment is not applied. However, by applying the present embodiment, the reply limit time can be set to an appropriate length. Moreover, rather than uniformly making the reply limit time longer, it is set to be able to change depending on the number of visual targets presented at one time, so the reply limit time is not excessively long, and furthermore, the time from the start of the examination to the end is not excessively long.

[0096] The reply limit time can also be set to be able to change depending on the past reply time required by the subject.

[0097] The "past reply time required by the subject" can be either the actual reply time at the time of presenting the visual target in the visual field test performed on another date, or the actual reply time required at the first, second presentation of the visual target during the period from the start of the examination to the end.

[0098] In summary, in order to determine the degree of making the reply limit time longer in the mode described earlier, that is, the mode in which the reply limit time is able to change depending on the number of visual targets presented at one time, it is preferable to associate the number of visual targets at that time with the actual reply time and save the associated data in a storage section in the visual field test device or a cloud or the like on the network. Then, based on this data, the degree of making the reply limit time longer can be determined depending on the number of visual targets presented at one time.

[0099] Hereinafter, a case where the "past reply time required by the subject" is the actual reply time required at the first, second presentation of the visual target during the period from the start of the examination to the end will be exemplified and described in detail.

[0100] Assume that the number of times of presenting the optotypes to the examinee during the period from the start to the end of the examination is set to n times or more (n is an integer of 3 or more), and the kth (k is an integer of 2 or more and k < n) optotype presentation. Further, the number of optotypes is assumed to be a plurality of fixed values. In this case, the reply limit time can also be set based on at least one of the actual reply times required by the examinee at the optotype presentations from the 1st to the (k-1)th.

[0101] As an example, the average of the actual reply time at the 1st time and the actual reply time at the 2nd time can be set as the reply limit time after the 3rd time or a time obtained by adding a margin of about 0.1 seconds to the time. Of course, the present application is not limited to this example, and for example, the actual reply time at the 1st time can be referred to instead of the average, and the average of the actual reply time at the 2nd time and the actual reply time at the 3rd time can also be referred to.

[0102] Figure 5 is a explanatory diagram showing a case where the reply limit time is varied according to the number of optotypes displayed at a time in the visual inspection apparatus of the present embodiment.

[0103] For example, assume a case where the number of optotypes at the 1st optotype presentation is one, the number of optotypes at the 2nd time is two, and the number of optotypes at the 3rd time is three, and the reply limit time at the 1st time is set to t1 [seconds], the reply limit time at the 2nd time can be set to t1 + a [seconds], and the reply limit time at the 3rd time can be set to t1 + a + b [seconds].

[0104] An example using numerical values will be described below.

[0105] The initial reply limit time is set to 2500 [msec], and the reply limit time is increased by 1000 [msec] each time the number of optotype presentations is increased. Thereafter, in a case where the reply limit time up to the 3rd time is lower than 1500 [msec], the reply limit time can be set to 2000 [msec], and the increase based on the number of optotype presentations can be set to 800 [msec]. Hereafter, the variation amount based on the reply limit time and the number of optotype presentations is increased or decreased in accordance with the reply limit time.

[0106] One specific example of the structure of the visual inspection apparatus will be described below. The present application is not limited to the specific example below.

[0107] Figure 6 is a block diagram showing the structure of a control system including the visual inspection apparatus of the present embodiment.

[0108] The tablet terminal 1 as a computer can also have the display section 10, the input section 20, and the control section 30. The tablet terminal 1 can function as the fixation target display section 40, the target display section 50, the click detection section 60, the calculation section 70, and the adjustment section 80 by the control section 30 executing a prescribed program.

[0109] The display section 10 is a section that presents a fixation target and a target to a subject by displaying them, and is a section that functions as a so-called display. The input section 20 is a section that receives a case where the subject clicks the target, and is a section that functions as a so-called touch panel. For a tablet terminal, the touch panel itself is a display.

[0110] The control section 30 realizes various functions (units) at the time of a visual field test. The control section 30 can also utilize a control section mounted on a known tablet terminal.

[0111] In the control section 30, a combination of a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), an HDD (Hard disk drive), various interfaces, and the like is mounted on a computer (hereinafter, the computer refers to a tablet terminal). In addition, the control section 30 is configured to realize various functions by a CPU executing a prescribed program saved in a ROM or an HDD. The prescribed program for realizing each function is installed in the computer to be used, but before the installation, it can be provided saved in a storage medium that the computer can read, or it can be provided through a communication line connected to the computer.

[0112] As an example of the functions (units) realized by executing the above-described program, the control section 30 has the fixation target display section 40, the target display section 50, the click detection section 60, the calculation section 70, and the adjustment section 80.

[0113] The fixation target display section 40 is a structure for displaying a fixation target on the display section 10. The target display section 50 is a structure for displaying a target on the display section 10. The fixation target display section 40 and the target display section 50 can employ a function of displaying an image on a touch panel of an existing tablet terminal.

[0114] The click detection section 60 is a section that detects a click when a subject clicks a target, and can employ a pressure-sensitive function of an existing tablet terminal.

[0115] The calculation section 70 can also be any one of the following or a combination thereof.

[0116] • a section for calculating a degree of variation in click sensitivity depending on eccentricity of a target.

[0117] • a section for calculating the degree of variation in the attention level from the eccentricity of the target.

[0118] • a section for calculating the response limit time from the number of targets presented at each time.

[0119] Further, the calculation section 70 can also utilize the calculation function of a known tablet terminal.

[0120] The adjustment section 80 can also be any one of the following or a combination thereof.

[0121] • a section for reflecting the degree of variation in the click sensitivity in the touch screen.

[0122] • a section for reflecting the degree of variation in the attention level in the touch screen.

[0123] • a section for determining the response limit time to be used in the presentation of the target at the kth time next, from data (e.g., a matrix) obtained by correlating the number of targets at this time with the actual response time, which is saved in a storage section in the visual inspection device or on a cloud or the like on a network.

[0124] Further, the adjustment section 80 can also be configured to function as the calculation section.

[0125] The technical idea of the present embodiment is not limited to a visual inspection device that includes a touch screen as a part of the structure. For example, each of the above-described functions can also be exerted by a visual inspection system connected by a wired or wireless network with respect to a known tablet terminal. In addition, it can be said that a program that causes a computer (e.g., a tablet terminal) to function in such a manner as to exert each of the above-described functions and a storage medium thereof also reflect the technical idea of the present application.

[0126] Further, the inspection using the visual inspection device can be performed in a state in which both eyes are observed or in a state in which monocular observation is performed with one eye being covered.

[0127] The scope of the present application is not limited to the above-described embodiments, but also includes modes obtained by applying various modifications and improvements within a range in which the specific effects obtained by the technical features of the application and combinations thereof are derived.

[0128] It is preferable that a standby position marker of the hand for avoiding the hand of the examinee from being continuously disposed between the examinee and the touch screen be further provided.

[0129] Figure 7 (a) of FIG. 1 is a diagram showing a case in which the hand of the examinee is continuously disposed between the examinee and the touch screen when the target is presented to the examinee in the visual inspection device of the present embodiment, Figure 7(b) is a view showing a case where the standby position mark of the hand is set and the examinee complies with the mark.

[0130] As Figure 7 In the case where the examinee is presented with the visual target a plurality of times by the visual inspection apparatus of the present embodiment, it is possible to forget to restore the position of the hand and continuously place the hand in the vicinity of the touch screen. As a result, the reply time is shortened, and it is possible to affect the actual inspection result. To prevent this, as shown in (b) of Figure 7 the standby position mark of the hand is set to urge the examinee to place the hand back to the position of the mark.

[0131] In addition, a chin rest (not shown) for placing the chin of the examinee can also be provided to maintain the positional relationship between the touch screen and the eyes of the examinee.

[0132] In addition, the shape of the standby position mark of the hand is arbitrary. It can be the shape of a hand, or simply a straight line or the like. The standby position mark of the hand can also be a separately prepared plate-shaped member. In this case, the tip of the plate-shaped member can be bent to function as a stand that maintains the inclined posture of the tablet terminal. In this case, the inclination angle of the tablet terminal can be fixed. In addition, if a chin rest is provided on the plate-shaped member, the positional relationship between the eyes of the examinee and the touch screen of the tablet terminal can be fixed.

[0133] In the above-described embodiments, the visual inspection apparatus is described as being a tablet terminal type inspection apparatus, but is not limited thereto, and can be applied, for example, to an inspection apparatus that displays an inspection image on a display having a touch screen to perform visual field inspection.

[0134] In addition, if the degree of variation in the click sensitivity, the degree of variation in the visual target attention, and / or the degree of variation in the reply limit time are set in advance, the operation unit is not required.

[0135] Explanation of Reference Numerals

[0136] 1: tablet terminal; 10: display unit; 20: input unit; 30: control unit; 40: fixation target display unit; 50: visual target display unit; 60: click detection unit; 70: operation unit; 80: adjustment unit.

Claims

1. A visual inspection device, wherein, a touch screen is provided, which is configured to display optotypes on the touch screen in succession in a state in which a fixation target whose position on the touch screen is fixed is displayed, during a period from the start to the end of an inspection, and to obtain an inspection result based on a result of whether or not a subject has clicked on the optotypes, a degree of attention of the optotypes, which indicates how easily the subject visually recognizes the optotypes, is varied in accordance with eccentricity of the optotypes with respect to the fixation target, the greater the eccentricity of the optotypes with respect to the fixation target, the more the degree of enlargement is increased when enlarging a click determination function that is imparted to pixels of the optotypes is imparted to pixels around the optotypes, in order to increase click sensitivity.

2. The visual inspection device according to claim 1, wherein, the degree of attention of the optotypes is increased by varying contrast, brightness, or size of the optotypes, and / or varying presentation time of the optotypes.

3. The visual inspection device according to claim 1, wherein, a reply limit time given to the subject when the optotypes are presented to the subject a plurality of times during a period from the start to the end of the inspection is variable at each time, the reply limit time is able to be changed in accordance with a number of the optotypes that are presented at one time at each time when the optotypes are presented to the subject a plurality of times during a period from the start to the end of the inspection.

4. The visual inspection device according to claim 1, wherein, when the subject clicks on all of the presented optotypes, the reply is considered to be correct, when the optotypes are presented to the subject a plurality of times during a period from the start to the end of the inspection, including a plurality of times that the optotypes are presented at one time.

5. The visual inspection device according to any one of claims 1 to 4, wherein, a standby position marker of a hand is further provided, which is used to avoid the subject's hand from being continuously disposed between the subject and the touch screen.

6. A visual inspection system, wherein, optotypes are displayed on a touch screen in succession in a state in which a fixation target whose position on the touch screen is fixed is displayed, during a period from the start to the end of an inspection, and an inspection result is obtained based on a result of whether or not a subject has clicked on the optotypes, a degree of attention of the optotypes, which indicates how easily the subject visually recognizes the optotypes, is varied in accordance with eccentricity of the optotypes with respect to the fixation target, the greater the eccentricity of the optotypes with respect to the fixation target, the more the degree of enlargement is increased when enlarging a click determination function that is imparted to pixels of the optotypes is imparted to pixels around the optotypes, in order to increase click sensitivity.

7. A computer program product including a visual inspection program, wherein, The visual inspection program causes a computer to execute the following steps: in the inspection, a fixation target whose position on a touch screen is fixed is displayed on the touch screen, a visual target is displayed in succession in a state in which the fixation target is displayed, an inspection result is obtained based on a result of whether or not the examinee clicks the visual target, and the degree of attention of the visual target is varied according to eccentricity of the visual target with respect to the fixation target, the degree of attention of the visual target referring to the degree to which the examinee easily visually recognizes the visual target, The greater the eccentricity of the visual target with respect to the fixation target, the more the degree of expansion is increased when the expansion of the click determination function that is given to the pixels of the visual target is given to the pixels around the visual target, in order to increase the click sensitivity.

8. The computer program product according to claim 7, wherein The degree of attention of the visual target is increased by varying the contrast, brightness, or size of the visual target, and / or by varying the presentation time of the visual target.

9. The computer program product according to claim 7, wherein The reply limit time given to the examinee when the visual target is presented a plurality of times during the period from the start of the inspection to the end of the inspection is variable at each time, The reply limit time is able to be changed according to the number of visual targets presented at one time at each time when the visual target is presented a plurality of times to the examinee during the period from the start of the inspection to the end of the inspection.

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