JP6928382B2 - Visibility evaluation system - Google Patents

Description

The present invention relates to a visibility evaluation system.

Training methods and systems for dynamic visual acuity and reaction movements that are useful for improving athletic ability from children to adults, elderly people, etc. by requesting a response accompanied by physical exercise are being considered. For example, Patent Document 1 uses a training system including at least a display for displaying a user's training image and a response input means for inputting a response from the user, and the user's dynamic visual acuity and reaction motion. How to train is disclosed.

JP-A-2010-104475

With the aging of society as a whole, for example, accurate understanding of individual driving abilities is required. Therefore, there is an increasing need for a visibility evaluation system that can accurately evaluate the visual field of a subject with respect to the peripheral visual field, even though the evaluation procedure is simple.

The present invention has been made in view of such a problem, and provides a visibility evaluation system capable of accurately evaluating the visual ability of a subject with respect to the peripheral visual field, even though the evaluation procedure is simple.

According to the first aspect of the present invention, the visibility evaluation system is arranged facing the subject, a predetermined reference position is defined, and an optotype presenting board capable of arranging an optotype at a position different from the reference position. And the visibility evaluation information for evaluating the visibility of the subject based on the line-of-sight analysis device capable of identifying the gaze point of the subject and the movement of the gaze point of the subject from the reference position to the target. It is equipped with an information processing device for acquiring.

According to the second aspect of the present invention, in the visibility evaluation system according to the first aspect, the information processing apparatus uses the reference point as the visibility evaluation information after the gazing point leaves the reference position. Gets the time it takes to reach the position where.

According to the third aspect of the present invention, the visibility evaluation system according to the first or second aspect is arranged between the subject and the optotype presenting board, and can switch between a transmission state and a shielding state. Further provided with a shielding device.

According to the fourth aspect of the present invention, the visibility evaluation system according to the third aspect visually presents the reference position on the optotype presenting board even when the shielding device is in the shielding state. A reference position presentation device is further provided.

According to a fifth aspect of the present invention, the visibility evaluation system according to any one of the first to fourth aspects accepts an optotype recognition input that accepts an input operation performed when the subject recognizes the optotype. Further provided means.

According to the sixth aspect of the present invention, in the visibility evaluation system according to any one of the first to fifth aspects, the optotype is formed in a shape extending in a predetermined direction.

According to the visibility evaluation system according to any one of the above aspects, the visual ability of the subject with respect to the peripheral visual field can be accurately evaluated even though the evaluation procedure is simple.

It is a figure which shows the whole structure of the visibility evaluation system which concerns on one Embodiment of this invention. It is a block diagram which shows the functional structure of the visibility evaluation system which concerns on one Embodiment of this invention. It is a figure which shows an example of the arrangement structure of the visibility evaluation system which concerns on one Embodiment of this invention. It is a figure which shows an example of the optotype according to one Embodiment of this invention. It is a flowchart which shows an example of the processing of the visibility evaluation system which concerns on one Embodiment of this invention. It is a figure which shows an example of the visibility evaluation information which concerns on one Embodiment of this invention.

Hereinafter, the visibility evaluation system 1 according to the embodiment of the present invention will be described with reference to FIGS. 1 to 6.

(Overall configuration of visibility evaluation system)
FIG. 1 is a diagram showing an overall configuration of a visibility evaluation system according to an embodiment of the present invention.
As shown in FIG. 1, the visibility evaluation system 1 includes an optotype presenting board 2, a head-mounted device 3, a light emitting device 4, an optotype recognition button 5, and an information processing device 6.

The optotype presentation board 2 is arranged to face the subject T. A reference position M0 is defined at the center point of the plate surface of the optotype presenting board 2. Further, the optotype presentation board 2 can arrange the optotype 20 at a plurality of positions (figure position M1) different from the reference position M0.

The optotype 20 is arranged at any one of a plurality of optotype positions M1 provided on the plate surface of the optotype presentation board 2. The optotype 20 is formed in a rectangular shape, for example. The arrangement position, color, angle, etc. of the optotype 20 are appropriately changed by the inspector O in a series of steps of visibility evaluation using the visibility evaluation system 1.

The head wearing device 3 is worn on the head of the subject T. The head-mounted device 3 includes a liquid crystal shutter 30 and a line-of-sight analysis device 31.

The liquid crystal shutter 30 (cloaking device) is arranged between the subject T and the target display board 2 so as to cover the entire field of view of the subject T. The liquid crystal shutter 30 is capable of switching between a transmission state and a shielding state according to an input operation of the inspector O to the information processing device 6. In the shielded state, the liquid crystal shutter 30 becomes a state like frosted glass and blocks the field of view of the subject T. In this case, the subject T cannot visually recognize the target display board 2. On the other hand, when in the transmissive state, the liquid crystal shutter 30 is in a state like transparent glass. In this case, the subject T can visually recognize the optotype presentation board 2.

The line-of-sight analysis device 31 is a device that can identify the gazing point of the subject T. Specifically, the line-of-sight analysis device 31 can identify which position of the optotype presentation board 2 the subject T is gazing at by detecting the dark pupil with a small camera.

The light emitting device 4 (reference position presenting device) is arranged at the reference position M0 of the optotype presenting board 2 and emits light L visible to the subject T. The light emitting device 4 may be, for example, a laser pointer, an LED element, or the like. The light L emitted by the light emitting device 4 is adjusted to an output level that can be visually recognized by the subject T even when the liquid crystal shutter 30 is in a shielded state. That is, the subject T can adjust the gazing point to the reference position M0 even when the liquid crystal shutter 30 is in the shielded state by visually recognizing the light L.

The optotype recognition button 5 (optimal target recognition input means) is arranged at the hand of the subject T. The optotype recognition button 5 is a push-button type input device capable of accepting an input operation performed when the subject T recognizes the optotype 20 on the optotype presentation board 2.

The information processing device 6 is a terminal device that controls the operation of the entire visibility evaluation system 1 while accepting operations by the inspector O. The information processing device 6 records the movement of the gazing point of the subject T from the reference position M0 to the optotype position M1 on the optotype presentation board 2. Then, the information processing device 6 acquires the visibility evaluation information for evaluating the visibility (visual ability) of the subject T.

(Functional configuration of visibility evaluation system)
FIG. 2 is a block diagram showing a functional configuration of a visibility evaluation system according to an embodiment of the present invention.
As shown in FIG. 2, the information processing device 6 of the visibility evaluation system 1 includes a CPU 60, a connection interface 61, a memory 62, an operation unit 63, a display unit 64, and a storage 65.

The connection interface 61 is a communication interface for communicating with the head-mounted device 3 (liquid crystal shutter 30, line-of-sight analysis device 31), the light emitting device 4, and the optotype recognition button 5.

The memory 62 is a so-called main storage device, and instructions and data for the CPU 60 to operate based on a program are expanded.

The operation unit 63 is an input device that accepts the operation of the inspector O, and may be, for example, a general mouse, keyboard, touch sensor, or the like.

The display unit 64 is a display device capable of visually displaying information, and realizes, for example, a liquid crystal display, an organic EL display, a curved display, VR (virtual reality), MR (Mixed Reality), and AR (Augmented Reality). It may be a display or the like.

The storage 65 is a so-called auxiliary storage device, and may be, for example, an HDD (Hard Disk Drive), an SSD (Solid State Drive), or the like. In the storage 65, for example, information indicating the movement of the gazing point acquired by the line-of-sight analysis device 31 is recorded.

The CPU 60 is a processor that controls the entire operation of the CPU 60. The CPU 60 acquires visibility evaluation information for evaluating the visibility of the peripheral visual field of the subject T based on the movement of the gazing point specified by the line-of-sight analysis device 31. The visibility evaluation information is exemplified by the following information, for example.
(1) Time from when the liquid crystal shutter 30 is in the transmissive state until the gazing point of the subject T leaves the reference position M0 (2) The visual view where the optotype 20 is located after the gazing point of the subject T leaves the reference position M0. Time to reach the target position M1 (3) Time from when the gazing point of the subject T reaches the target position M1 where the target 20 is located until the target recognition button 5 is pressed (4) Target Correct answer rate for each position of 20 (5) Correct answer rate for the color of the target 20 (6) Oversight rate of the target 20

(Example of layout configuration of visibility evaluation system)
FIG. 3 is a diagram showing an example of an arrangement configuration of a visibility evaluation system according to an embodiment of the present invention.
FIG. 4 is a diagram showing an example of a target according to an embodiment of the present invention.
An example of the arrangement configuration of the visibility evaluation system 1 will be described with reference to FIGS. 3 to 4. Here, an embodiment in which the visibility evaluation system 1 is used to evaluate whether the subject T has the visibility ability to drive a car safely will be described as an example.

The driver of a car recognizes an object (pedestrian, moving object such as a bicycle, dust, falling object, obstacle such as a parked vehicle, etc.) existing on or on the road side, and is in danger of colliding with the object. If there is, you need to apply the brakes to stop the car. The car travels a certain distance between the time the driver recognizes the danger and the time the car brakes and stops. This is called the stop distance. The stopping distance is the distance traveled by the vehicle (free running distance) in the reaction time from when the driver recognizes the danger to when the brakes are applied, and the distance traveled between when the driver applies the brakes and when the vehicle stops (braking). Distance) is the total distance.

It is assumed that the driver stops the vehicle 1 m before the object in order to prevent a collision with the object.
For example, if the road surface is dry (coefficient of friction = 0.7) and the reaction speed of the driver is an average value (0.75 seconds), the driver of a car traveling at 60 km / h is about 34 m. It is necessary to be able to recognize the object in the foreground. In this case, the driver needs to have a visual ability to recognize an object in a peripheral visual field that is approximately ± 15 degrees in the horizontal direction from the center of the visual field.
Further, for example, if the road surface is wet (coefficient of friction = 0.5) and the reaction speed of the driver is slower than the average (for example, 1.10 seconds), the driver of the automobile traveling at 60 km / h It is necessary to be able to recognize the object about 48 m before. In this case, the driver needs to have a visual ability to recognize an object in a peripheral visual field that is approximately ± 10 degrees in the horizontal direction from the center of the visual field.
Based on such an assumption, the visibility evaluation system 1 has an arrangement configuration capable of evaluating the visibility ability of the subject T, who is a driver, in the peripheral visual field.

Specifically, as shown in FIG. 3, the optotype presentation board 2 is arranged at a position separated from the subject T by a distance D1. In the present embodiment, an example in which the distance D1 is set to 2 m will be described, but the present invention is not limited to this. In another embodiment, it can be arbitrarily changed according to the size of the room in which the visibility evaluation system 1 is installed.

The liquid crystal shutter 30 is arranged at a position separated from the subject T by a distance D2. The distance D1 is set according to the size of the optotype presenting board 2 and the distance D1 from the subject T so that the liquid crystal shutter 30 can cover the entire field of view of the subject T. Specifically, the distance D2 is set to an arbitrary value between, for example, 0.05 m and 0.20 m.

The optotype presentation board 2 is formed in a rectangular shape, a square shape, or a curved surface having a width W1 and a height H1. The width W1 is set to, for example, 2 m to 3 m, and the height H1 is set to, for example, 1 m to 2 m.

Further, in the optotype presentation board 2, the reference position M0 is arranged substantially at the center in the horizontal direction and the vertical direction, and a plurality of optotype positions M1 are arranged around the reference position M0.
For example, as shown in FIG. 3, the plurality of optotype positions M1 are composed of a plurality of optotype positions M1a arranged in the horizontal direction and a plurality of optotype positions M1b arranged in the vertical direction.

The plurality of optotype positions M1a are arranged in the horizontal direction within a width W2 centered on the reference position M0 so as to be included in a predetermined visual field region in the horizontal direction of the subject T.
The predetermined visual field region in the horizontal direction indicates a range of the visual field within θ1 degree in the horizontal direction with the time when the gazing point of the subject T is at the reference position M0 as a reference (0 degree). As described above, the subject T, who is the driver of the automobile, is required to be able to recognize the object in the peripheral visual field separated by ± 15 degrees in the horizontal direction. Further, since it is desirable that the object can be recognized in a wider range during operation, θ1 degree is set to a value of at least ± 15 degrees or more. In this embodiment, it is preferable that θ1 degree is set to ± 20 degree in consideration of evaluating the visual ability of an object (pedestrian or the like) on the road from the inside of a vehicle where the field of view is restricted. .. In another embodiment, assuming a situation in which the field of view of the subject T is not obstructed, θ1 degree is set to a value larger than ± 20 degrees (for example, up to ± 100 degrees assuming a human field of view in the horizontal direction). It may be set to any value of).
For example, when θ1 degree is ± 20 degrees and the distance D1 between the subject T and the optotype presentation board 2 is 2 m, the width W2 is about 1.456 m.

Further, the plurality of optotype positions M1a are arranged at predetermined intervals C1 on the left and right sides of the reference position M0 at substantially the center of the optotype presenting board 2 in the vertical direction. The interval C1 indicates the distance between the centers of two adjacent optotype positions M1a.
In the present embodiment, the interval C1 is set so as to correspond to the distance when the line of sight of the subject T is moved 5 degrees in the horizontal direction. For example, when the distance D1 between the subject T and the optotype presentation board 2 is 2 m, the distance C1 is set to about 0.175 m.

The plurality of optotype positions M1b are vertically arranged within a range of height H2 centered on the reference position M0 so as to be included in a predetermined visual field region in the vertical direction of the subject T.
The predetermined visual field region in the vertical direction indicates the range of the visual field within θ2 degrees in the vertical direction with the time when the gazing point of the subject T is at the reference position M0 as a reference (0 degrees). In the present embodiment, it is preferable that θ2 degree is set to ± 10 degree in consideration of evaluating the visual ability of an object (pedestrian or the like) on the road from the inside of the automobile where the field of view is limited. In another embodiment, assuming a situation in which the field of view of the subject T is not obstructed, θ1 degree is set to a value larger than ± 10 degrees (for example, up to ± 70 degrees assuming a visual field range in the vertical direction of a human being). It may be set to any value of).
For example, when θ2 degrees is ± 10 degrees and the distance D1 between the subject T and the optotype presentation board 2 is 2 m, the height H2 is about 0.705 m.

Further, the plurality of optotype positions M1b are arranged at predetermined intervals C2 above and below the reference position M0 at substantially the center of the optotype display board 2 in the horizontal direction. The interval C2 indicates the distance between the centers of two adjacent optotype positions M1b.
In the present embodiment, the interval C1 is set so as to correspond to the distance when the line of sight of the subject T is moved by 5 degrees in the vertical direction. For example, when the distance D1 between the subject T and the optotype presentation board 2 is 2 m, the distance C2 is set to about 0.175 m.

Note that FIG. 3 shows an example in which a row consisting of a plurality of optotype positions M1a and a column composed of a plurality of optotype positions M1b are arranged in a cross shape substantially in the center of the optotype presentation board 2. However, it is not limited to this. In another embodiment, a plurality of rows consisting of a plurality of optotype positions M1a may be arranged vertically within a range of height H2, or a column consisting of a plurality of optotype positions M1b may be arranged within a range of width W2. A plurality of them may be arranged on the left and right.

As shown by the solid line in FIG. 4, the optotype 20 is formed in a rectangle extending in the vertical direction (rectangle having an inclination of 0 degrees).
For example, the optotype 20 simulates the size of a pedestrian located on the roadside (peripheral visual field ± 15 degrees away from the center of the visual field) about 34 m away when the subject T, who is a driver, sees it.
Specifically, it is assumed that the average size of the upper limbs of a pedestrian seen from the position of the driver is about 50 cm in length and about 12 cm in width. When the distance D1 between the subject T and the optotype presentation board 2 is 2 m, the optotype 20 is formed into a rectangle having “length X1 = about 3 cm” and “width X2 = about 1.3 cm”. The length X1 and the width X2 may be appropriately changed according to the distance D1 to the optotype presenting board 2 and the size of the assumed object.

Further, as shown by the broken line in FIG. 4, the optotype 20 may be formed in a rectangle extending in a direction inclined by α degree from the vertical direction (rectangle having an inclination of α degree). The α degree is set to, for example, +15 degree or -15 degree. The inspector O may select an arbitrary optotype 20 from the plurality of optotypes 20 having different inclinations.

Further, the color of the optotype 20 is set to a color different from the background color of the optotype presenting board 2 and the optotype position M1. The color of the optotype 20 may be a single color, a combination of a plurality of colors, a stripe or a checkered pattern. The inspector O may select an arbitrary optotype 20 from the plurality of optotypes 20 having different colors in this way.

The optotype position M1 is formed to a size in which the optotype 20 can be arranged. For example, the optotype position M1 is formed in a circular shape having a diameter of X3 (about 7 to 10 cm). Further, the background color of the optotype position M1 is set to the same color as the background color of the optotype presentation board 2.

(Processing flow of visibility evaluation system)
FIG. 5 is a flowchart showing an example of processing of the visibility evaluation system according to the embodiment of the present invention.
The visibility evaluation system 1 according to the present embodiment is installed in a room where outside light is blocked by a blackout curtain or the like, and is arranged at any one of a plurality of optotype positions M1 under certain environmental conditions. The time until the subject T recognizes the mark 20 is measured. Then, the visibility evaluation system 1 repeatedly executes the measurement a predetermined number of times (for example, three times for each of the target positions M1) to evaluate the visibility ability of the subject T. The environmental condition indicates the brightness of the room. The environmental conditions are, for example, "light place" that is supposed to be driven in the daytime, "twilight" that is supposed to be driven in the evening, stormy weather, etc., and "dark place" that is supposed to be driven at night. Shall be selected.
Hereinafter, the flow of the evaluation process by the visibility evaluation system 1 will be described in detail with reference to FIG.

First, the information processing device 6 puts the liquid crystal shutter 30 attached to the subject T in a shielding state (step S01). For example, the information processing device 6 receives an input operation of the inspector O via the operation unit 63 and puts the liquid crystal shutter 30 in a shielding state. Further, the information processing device 6 may automatically put the liquid crystal shutter 30 in a shielded state at a timing set by the inspector O via the operation unit 63.
At this time, the subject T adjusts the gazing point to the reference position M0 of the optotype presenting board 2 by visually recognizing the light L emitted from the light emitting device 4 through the liquid crystal shutter 30. Further, the information processing device 6 may analyze the line of sight of the subject T by the line-of-sight analysis device 31 and confirm whether the subject T is focusing on the reference position M0. The analysis result by the line-of-sight analysis device 31 may be sequentially displayed on the display unit 64 of the information processing device so that the examiner O can confirm the position of the gazing point of the subject T.

Next, the inspector O arranges the optotype 20 at any one of the plurality of optotype positions M1 on the optotype presentation board 2 (step S02). For example, the optotype position M1 on which the optotype 20 is arranged may be predetermined by the information processing device 6 for each measurement so that the subject T cannot predict it. In this case, the information processing device 6 may instruct the inspector O of the optotype position M1 to which the optotype 20 should be arranged via the display unit 64.

Next, the information processing device 6 accepts the input operation of the inspector O and puts the liquid crystal shutter 30 attached to the subject T into a transparent state (step S03). For example, the information processing device 6 receives an input operation of the inspector O via the operation unit 63 and puts the liquid crystal shutter 30 in a transparent state. At this time, the inspector O randomizes the time from when the liquid crystal shutter 30 is put into the transparent state to when the liquid crystal shutter 30 is put into the transparent state so that the subject T cannot predict the timing when the liquid crystal shutter 30 is in the transparent state. Further, the information processing device 6 may automatically set the liquid crystal shutter 30 in a transparent state at random timing according to the setting input by the inspector O via the operation unit 63.

When the liquid crystal shutter 30 becomes transparent and the optotype presenting board 2 becomes visible, the subject T searches for the optotype 20 arranged on the optotype presenting board 2 and moves his / her line of sight. During this time, the line-of-sight analysis device 31 identifies the position of the gazing point of the subject T and sequentially outputs the position to the information processing device 6.
Then, the information processing device 6 records the movement of the gazing point of the subject T output from the line-of-sight analysis device 31 in association with the elapsed time from the time when the liquid crystal shutter 30 is in the transmissive state (step S04). Specifically, the information processing device 6 sets "the time from when the liquid crystal shutter 30 is in the transmissive state until the gazing point of the subject T leaves the reference position M0" and "the gazing point of the subject T sets the reference position M0". The time from the distance until the target position M1 where the target 20 is located is recorded.
“The gazing point of the subject T has left the reference position M0” indicates that the gazing point of the subject T has moved out of the circular frame of the reference position M0 shown in FIG. Further, "the gazing point of the subject T reaches the optotype position M1" means that the gazing point of the subject has moved within the circular frame of the optotype position M1 shown in FIG. The information processing device 6 sets a virtual area wider (or narrower) than the circular frame shown in FIG. 3 according to the accuracy of the line-of-sight analysis device 31, and the gazing point of the subject T is inside or outside the virtual area. When moving to, it may be determined that "the target position M1 has been reached" or "the reference position M0 has been left". Further, this virtual area may be rectangular instead of circular.

Next, the information processing device 6 receives an input operation indicating that the subject T has recognized the optotype 20 via the optotype recognition button 5 (step S05). At this time, the information processing device 6 records "the time (reaction time) from when the gazing point of the subject T reaches the optotype position M1 where the optotype 20 is located until the optotype recognition button 5 is pressed". do.
Further, in the information processing device 6, when the target recognition button 5 is not pressed even after a predetermined time (for example, 1 second) has elapsed after the liquid crystal shutter 30 is in the transmissive state, "subject T presses the target 20. Record that you overlooked it.

Next, the information processing device 6 determines whether or not the measurement of a predetermined number of times is completed (step S06).
When the measurement of the predetermined number of times is not completed (step S06: NO), the information processing apparatus 6 returns to step S01 and performs the next measurement.
On the other hand, when the measurement of a predetermined number of times is completed (step S06: YES), the information processing apparatus 6 creates the visibility evaluation information R1 (FIG. 6) based on the measurement result of each measurement (step S07). At this time, the information processing device 6 may display the created visibility evaluation information R1 on the display unit 64 so that the inspector O can confirm it.

FIG. 6 is a diagram showing an example of visibility evaluation information according to an embodiment of the present invention.
As shown in FIG. 6, the visibility evaluation information R1 includes "subject information", "target type", "time when the gazing point leaves the reference position", and "time when the gazing point reaches the optotype position". , "Time until the optotype recognition button is pressed", "Correct answer rate for each placement position", "Correct answer rate", "Oversight rate" and the like are included.

"Subject information" is information for identifying a subject. The "subject information" may include information such as subject ID, name, gender, and age. The subject information is input to the information processing device 6 by the inspector O via the operation unit 63 before performing a series of measurements.

The "target type" is information indicating the type of the optotype 20 used in the series of measurements, and includes, for example, the color of the optotype 20, the angle of the optotype 20, and the like. The "target type" is input to the information processing device 6 by the inspector O via the operation unit 63 before performing a series of measurements.

The "time when the gazing point leaves the reference position" and the "time when the gazing point reaches the optotype position" are the "time when the liquid crystal shutter 30 is in a transmissive state" recorded by the information processing device 6 in step S04 of FIG. "Time from time until the gazing point of subject T leaves the reference position M0" and "time from when the gazing point of subject T leaves the reference position M0 to reach the optotype position M1 where the optotype 20 is located" Is shown.

The "time until the optotype recognition button is pressed" is the "time when the gazing point of the subject T reaches the optotype position M1 where the optotype 20 is located" recorded by the information processing device 6 in step S05 of FIG. The time from when the optotype recognition button 5 is pressed (reaction time) ”is shown.

The “correct answer rate for each placement position” indicates the rate at which the subject T can correctly see the target 20 for each of the plurality of target positions M1.
For example, the information processing device 6 has a correct answer rate for each of the plurality of optotype positions M1 (for example, the optotype position M1 located within a range of ± 15 degrees in the horizontal direction from the reference position). If is greater than or equal to a predetermined value (for example, 60%), subject T may be evaluated as having a visual ability to drive a car safely.

The "correct answer rate" is information indicating the rate at which the subject T can correctly see the target 20 with respect to the type (color, angle) of the target 20 used in the series of measurements. By referring to this information, the examiner O can know the change in the visual ability of the subject T depending on the color and angle of the optotype 20.

The “oversight rate” is information indicating the rate at which the subject T could not visually recognize the optotype 20 in a series of measurements (the rate recorded as “overlooked” in step S05 of FIG. 5).
For example, the information processing device 6 evaluates that the subject T does not have the visual ability to drive a car safely when the "oversight rate" is equal to or higher than a predetermined value (for example, 50%). You may.

The "time when the gazing point leaves the optotype position", "time when the gazing point reaches the optotype position", and "time until the optotype recognition button is pressed" are as shown in FIG. It is recorded for each measurement. Further, the information processing apparatus 6 may further calculate the average time in a series of measurements and include it in the visibility evaluation information R1.

When the information processing device 6 creates the visibility evaluation information R1, the processing ends. The inspector O may change the type (color and angle) of the optotype 20 and execute the series of processes shown in FIG. 5 again. By doing so, the information processing apparatus 6 can evaluate the visual ability of the subject T for each type of the optotype 20.
Further, the inspector O may change the indoor environmental conditions (“bright place”, “twilight”, “dark place”) to execute the series of processes shown in FIG. 5 again. By doing so, the information processing apparatus 6 can evaluate the visual ability of the subject T in various environments.

As described above, the visibility evaluation system 1 according to the present embodiment is arranged to face the subject T, a predetermined reference position M0 is defined, and the visibility evaluation system 1 is viewed at a position different from the reference position M0 (target position M1). Subject T based on the target display board 2 on which the target 20 can be placed, the line-of-sight analysis device 31 capable of identifying the gaze point of the subject T, and the movement of the gaze point of the subject T from the reference position M0 to the target 20. The information processing device 6 for acquiring the visibility evaluation information R1 for evaluating the visibility (visual ability) of the information processing device 6 is provided.
By doing so, the visibility evaluation system 1 can accurately evaluate the visibility ability of the subject T with respect to the peripheral visual field, even though the evaluation procedure is simple.

Further, the information processing device 6 acquires, as the visibility evaluation information R1, the time from when the gazing point leaves the reference position M0 to when the optotype 20 reaches the optotype position M1.
By doing so, the visibility evaluation system 1 can present the time required for the subject T to recognize the optotype 20 in the peripheral visual field as the visibility evaluation information R1 to the examiner O.

Further, the visibility evaluation system 1 is further provided with a liquid crystal shutter 30 (shielding device) which is arranged between the subject T and the optotype presenting board 2 and can switch between a transmission state and a shielding state.
By doing so, the subject T cannot know the position of the optotype 20 until the liquid crystal shutter 30 is in the transmissive state, so that the visual ability of the subject T can be accurately evaluated.

Further, the visibility evaluation system 1 further includes a light emitting device 4 (reference position presenting device) that visually presents the reference position M0 on the optotype presenting board 2 even when the liquid crystal shutter 30 is in a shielded state.
By doing so, the visibility evaluation system 1 can guide the subject T to align the gazing point of the subject T with the reference position M0 even while the subject T cannot see the optotype presentation board 2 by the liquid crystal shutter 30. ..

Further, the visibility evaluation system 1 further includes an optotype recognition button 5 (an optotype recognition input means) that accepts an input operation performed when the subject T recognizes the optotype 20.
By doing so, the visibility evaluation system 1 can measure the reaction time from the recognition of the optotype 20 by the subject T until the input operation is performed.

Further, the optotype 20 is formed in a shape extending in a predetermined direction. For example, as shown by the solid line in FIG. 4, the optotype 20 is formed in a rectangle extending in the vertical direction (rectangle with an inclination of 0 degrees). Further, as shown by the broken line in FIG. 4, the optotype 20 may be formed in a rectangle extending in a direction inclined by α degree from the vertical direction (rectangle having an inclination of α degree).
By doing so, the visibility evaluation system 1 can form the optotype 20 in a simple shape, which simulates a pedestrian located on the roadside (for example, 34 m ahead) in front of the driver of the automobile. ..

The various processing processes of the information processing apparatus 6 described above are stored in a computer-readable recording medium (storage 65) in the form of a program, and the various processing can be performed by the computer reading and executing this program. Will be done. The computer-readable recording medium refers to a magnetic disk, a magneto-optical disk, a CD-ROM, a DVD-ROM, a semiconductor memory, or the like. Further, this computer program may be distributed to a computer via a communication line, and the computer receiving the distribution may execute the program.

The above program may be for realizing a part of the above-mentioned functions. Further, it may be a so-called difference file (difference program) that can realize the above-mentioned function in combination with a program already recorded in the computer system.

As described above, some embodiments according to the present invention have been described, but all of these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and variations thereof are included in the scope of the invention described in the claims and the equivalent scope thereof, as are included in the scope and gist of the invention.

1 Visibility evaluation system 2 Target presentation board 20 Target 3 Head mounting device 30 Liquid crystal shutter (cloaking device)
31 Line-of-sight analysis device 4 Light emitting device (reference position presentation device)
5 Target recognition button (target recognition input means)
6 Information processing equipment

Claims (6)

An optotype presentation board that is placed facing the subject, a predetermined reference position is defined, and an optotype can be placed at a position different from the reference position.
A line-of-sight analysis device capable of identifying the gaze point of the subject, and
An information processing device that acquires visibility evaluation information for evaluating the visibility of the subject based on the movement of the gaze point of the subject from the reference position to the target.
Visibility evaluation system equipped with. The information processing device
The visibility evaluation system according to claim 1, wherein as the visibility evaluation information, the time from when the gazing point leaves the reference position to when the optotype reaches the position where the optotype is arranged is acquired. The visibility evaluation system according to claim 1 or 2, further comprising a shielding device arranged between the subject and the optotype presenting board and capable of switching between a transmission state and a shielding state. The visibility evaluation system according to claim 3, further comprising a reference position presenting device that visually presents the reference position on the optotype presenting board even when the shielding device is in a shielding state. The visibility evaluation system according to any one of claims 1 to 4, further comprising an optotype recognition input means that accepts an input operation performed when the subject recognizes the optotype. The visibility evaluation system according to any one of claims 1 to 5, wherein the optotype is formed in a shape extending in a predetermined direction.

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