Visual field assessment equipment

Abstract

To provide a visual field evaluation instrument that can realize visual field evaluation in a location where the use of electronic devices is restricted. [Solution] Visual field assessment device 1 is an instrument used to assess a user's visual field, and is characterized by comprising a head fixing part 2 fixed to the user's head, a transparent base 3 supported by head fixing part 2 and positioned in front of the user's eyes, and an effective visual field display part 4 that non-electronically displays the user's effective visual field on transparent base 3. Visual field assessment device 1 may also comprise a detachable fixing part 6 that detachably fixes transparent base 3 to head fixing part 2.

Description

[Technical Field]

[0001] The present invention relates to a visual field assessment device used to assess a user's visual field. [Background technology]

[0002] Currently, research is being conducted into devices that evaluate a user's visual field. For example, in medical settings, notices such as notices to alert users to missed tasks are placed based on experience, intuition, and trial and error. Meanwhile, in fields such as traffic safety and industry, evaluations based on the effective visual field are considered important as a basis for determining the placement of notices such as signs intended to alert users. Furthermore, in visual notice methods for safety measures in medical settings, it is important to place notices within the effective visual field. Therefore, a method is needed to evaluate whether notices are physically placed within the user's effective visual field.

[0003] Patent Document 1 discloses a system that displays an inspection target in a virtual reality environment on a virtual reality display of a head-mountable virtual reality device and evaluates the state of a user's visual field by determining whether the user detects the inspection target. However, because the visual field is evaluated electronically using electronic equipment, there is a problem that the visual field cannot be evaluated in locations where the use of electronic equipment is restricted. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2025-128370 Summary of the Invention [Problem to be solved by the invention]

[0005] Therefore, the present invention was devised in consideration of the above-mentioned problems, and its purpose is to provide a visual field assessment device that can enable visual field assessment in locations where the use of electronic devices is restricted. [Means for solving the problem]

[0006] The visual field assessment device in the first invention is a visual field assessment device used to assess a user's visual field, and is characterized by comprising a head fixing part that is fixed to the user's head, a transparent base that is supported by the head fixing part and positioned in front of the user's eyes, and an effective visual field display part that non-electronically displays the user's effective visual field on the transparent base.

[0007] The visual field evaluation device in the second invention is characterized in that, in the first invention, it is provided with a detachable fixing part that detachably fixes the transparent base to the head fixing part.

[0008] The visual field evaluation device in the third invention is characterized in that, in the first or second invention, the transparent base has a first transparent base placed in front of the user's left eye and a second transparent base placed in front of the user's right eye independent of the first transparent base, and the effective visual field display unit has a first effective visual field display unit that non-electronically displays the effective visual field of the left eye on the first transparent base, and a second effective visual field display unit that non-electronically displays the effective visual field of the right eye on the second transparent base.

[0009] The visual field evaluation device in the fourth invention is characterized in that, in the first or second invention, it is provided with an effective visual field reference line display unit that non-electronically displays a reference line for adjusting the position of the effective visual field display unit on the transparent base, spaced apart from the transparent base on the opposite side of the eye. [Effects of the Invention]

[0010] According to the first to fourth inventions, the visual field assessment device is equipped with an effective visual field display unit on a transparent base that non-electronically displays the user's effective visual field. Therefore, it is possible to determine whether or not a notification object falls within the effective visual field without using electricity. This allows visual field assessment to be performed in locations where the use of electronic devices is restricted. Furthermore, when the user focuses their gaze on an arbitrary gaze point, the effective visual field range can be seen at a glance, allowing anyone to easily determine the validity of whether or not a notification object falls within the effective visual field. This improves the usability of visual field assessment.

[0011] In particular, according to the second invention, the detachable fixing part detachably fixes the transparent base to the head fixing part. Therefore, the position of the transparent base on which the effective visual field display is displayed can be easily adjusted according to individual differences in head shape. This improves the accuracy of visual field evaluation.

[0012] In particular, according to the third invention, the visual field display section has a first visual field display section on a first transparent base and a second visual field display section on a second transparent base that is independent of the first transparent base. This allows the position of the visual field display section to be easily adjusted according to individual differences in the relative positions of the left and right eyes, thereby improving the accuracy of visual field evaluation.

[0013] In particular, according to the fourth invention, the effective visual field reference line display unit displays the reference line non-electronically, away from the transparent base. This allows the position of the transparent base on which the effective visual field display unit is displayed to be precisely adjusted according to the difference in the effective visual fields of the left and right eyes, thereby improving the accuracy of visual field evaluation. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 1 is a schematic diagram showing an example of a visual field evaluation device according to this embodiment. [Figure 2] FIG. 2 is a schematic diagram showing an example of a visual field evaluation device according to this embodiment. [Figure 3] FIG. 3 is a partially enlarged schematic view of a part of FIG. [Figure 4] FIG. 4 is a schematic diagram showing an example of the effective field of view in this embodiment. [Figure 5] FIG. 5 is a schematic diagram showing an example of how to use the visual field evaluation device according to this embodiment. [Figure 6] FIG. 6 is a schematic diagram showing an example of how to use the visual field evaluation device according to this embodiment. [Figure 7] FIG. 7 is a schematic diagram showing an example of an effective visual field reference line display unit constituting the visual field evaluation device in this embodiment. [Figure 8] FIG. 8 is a schematic diagram showing an example of an effective visual field reference line display unit constituting the visual field evaluation device in this embodiment. [Figure 9] FIG. 9 is a schematic diagram showing an example of an effective visual field reference line display unit constituting the visual field evaluation device in this embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0015] An example of a visual field assessment device 1 according to an embodiment of the present invention will be described in detail below with reference to the drawings. Note that the components in each drawing are shown schematically for the purpose of explanation, and the size of each component, the size comparison between components, etc. may differ from those shown in the drawings.

[0016] (Visual field evaluation device 1) An example of a visual field evaluation instrument 1 according to this embodiment will be described with reference to the drawings.

[0017] The visual field evaluation device 1 is an instrument used to evaluate a human visual field. As shown in FIG. 1, for example, the visual field evaluation device 1 comprises a head fixing unit 2, a transparent base 3, and an effective visual field display unit 4. The visual field evaluation device 1 may also comprise, for example, an induced visual field display unit 5 and a detachable fixing unit 6. As shown in FIG. 2, for example, the visual field evaluation device 1 is worn on the head of a user U and is used to evaluate the visual field of the user U.

[0018] The evaluation of the visual field of the user U refers to the evaluation of the effectiveness of the notification object O based on a determination of whether the notification object O is within the effective visual fields f1 and f2 centered on the fixation point P (P1, P2) (see FIG. 5). As shown in FIG. 2, the fixation point P1 and the effective visual field f1 correspond to the left eye of the user U, and the fixation point P2 and the effective visual field f2 correspond to the right eye of the user U.

[0019] The visual field evaluation device 1 includes an effective visual field display unit 4 on a transparent base 3 that non-electronically displays the effective visual field of the user U. In this case, whether or not the notification object O falls within the effective visual fields f1 and f2 can be determined without using electricity. This allows visual field evaluation to be performed in locations where the use of electronic devices is restricted. Furthermore, when the user U focuses their gaze on an arbitrary gaze point P, the effective visual field range can be seen at a glance, and anyone can easily determine the validity of whether or not the notification object O falls within the effective visual fields f1 and f2. This improves the usability of visual field evaluation.

[0020] Because visual field assessment device 1 does not operate electronically, using electronic devices to assess the visual field of user U in a medical setting would affect the medical equipment and permission had to be obtained, but visual field assessment device 1 does not affect the medical equipment and visual field assessment can be performed without permission. Note that visual field assessment device 1 may be used not only in medical settings, but also in any location where the effectiveness of notification object O needs to be evaluated, such as a construction site or a factory.

[0021] Because visual field assessment device 1 does not require an electronic power source, visual field assessment can be performed freely indoors or outdoors, regardless of whether user U is sitting or standing. Furthermore, because visual field assessment device 1 allows anyone to instantly and easily determine the validity of whether or not notification object O falls within the effective visual fields f1 and f2, the validity of notification object O can be efficiently evaluated while changing the standing position or head direction, regardless of the user U's level of visual field assessment proficiency. This improves the usability of visual field assessment.

[0022] <Head fixing part 2> The head fixing unit 2 is fixed to the head of the user U. For example, a frame such as goggles or a face shield is used as the head fixing unit 2. The head fixing unit 2 may be of any shape and material that allows the transparent base 3 to be positioned in front of the eyes of the user U.

[0023] The head fixing unit 2 supports the transparent base 3. Note that if the transparent base 3 is too close to the eyes of the user U, it may be difficult to focus the effective fields of view f1 and f2, so it is preferable that the head fixing unit 2 supports the transparent base 3 at a certain distance in front of the eyes of the user U.

[0024] As long as the portion of the head fixing part 2 that overlaps with the transparent base part 3 from the viewpoint of the user U is transparent, other portions may or may not be transparent.

[0025] <Transparent base 3> The transparent base 3 is a transparent portion that is placed in front of the eyes of the user U. The transparent base 3 is supported by the head fixing unit 2. The transparent base 3 may be made of any transparent shape and material that can non-electronically display the effective visual field display unit 4 and the induced visual field display unit 5.

[0026] The transparent base 3 may be in the form of a sheet separate from the head fixing unit 2, which is only a frame, as shown in Fig. 1. In this case, the transparent base 3 may be prepared in advance as a plurality of patterns of sheets with different shapes or arrangements of the effective visual field display unit 4 and the induction visual field display unit 5 (including the distance between the first effective visual field display unit 41 and the second effective visual field display unit 42, and the distance between the first induction visual field display unit 51 and the second induction visual field display unit 52, which will be described later), and the sheets may be attached to the head fixing unit 2 according to the distance to the fixation point P, the distance to the alarm object O, and other conditions for visual field evaluation. The transparent base 3 may be attached and fixed to the goggle-shaped head fixing unit 2, as shown in Fig. 2, for example.

[0027] The transparent base 3 may have a first transparent base 31 positioned in front of the user U's left eye, and a second transparent base 32 positioned in front of the user U's right eye independent of the first transparent base 31.

[0028] The distance between the transparent base 3 and the eyes of the user U is proportional to the size of the effective visual field display section 4 and the induction visual field display section 5, as described below, and the smaller the distance, the more likely the dimensions of the effective visual field display section 4 and the induction visual field display section 5 will deviate from the appropriate dimensions, so a distance of, for example, about 25 mm to 30 mm is preferable. However, if a transparent base 3 is used that can display the effective visual field display section 4 and the induction visual field display section 5 at a sufficiently large size, the distance may exceed this range.

[0029] <Effective visual field display unit 4, induced visual field display unit 5> The effective visual field display unit 4 is a part that non-electronically displays the range of the effective visual fields f1 and f2 calculated according to the distance from the eyes of the user U. The effective visual field display unit 4 non-electronically displays the effective visual fields f1 and f2 of the user U on the transparent base 3.

[0030] The visual field display unit 4 may include, for example, a first visual field display unit 41 that non-electronically displays the visual field f1 of the user U's left eye on the first transparent base 31, and a second visual field display unit 42 that non-electronically displays the visual field f2 of the user U's right eye on the second transparent base 32. In this case, the position of the visual field display unit 4 can be easily adjusted according to individual differences in the relative positions of the left and right eyes, thereby improving the accuracy of visual field evaluation.

[0031] The guidance visual field display unit 5 is a unit that non-electronically displays the ranges of guidance visual fields g1 and g2 calculated according to the distance from the eyes of the user U. The guidance visual field display unit 5 non-electronically displays the guidance visual fields g1 and g2 of the user U on the transparent base 3.

[0032] The induction visual field display unit 5 may include, for example, a first induction visual field display unit 51 that non-electronically displays an induction visual field g1 for the left eye of the user U on the first transparent base 31, and a second induction visual field display unit 52 that non-electronically displays an induction visual field g2 for the right eye of the user U on the second transparent base 32. In this case, the position of the induction visual field display unit 5 can be easily adjusted according to individual differences in the positional relationship between the left eye and the right eye, thereby improving the accuracy of visual field evaluation.

[0033] In addition, non-electronic display of the effective visual field display section 4 and the induced visual field display section 5 includes display by means of writing directly on the transparent base 3, or by means of attaching an object showing the outlines of the effective visual fields f1, f2 and the induced visual fields g1, g2, etc.

[0034] The first effective visual field display section 41 and the second effective visual field display section 42 may be displayed on one transparent base 3. Also, the first induction visual field display section 51 and the second induction visual field display section 52 may be displayed on one transparent base 3.

[0035] The effective visual field display section 4 and the guided visual field display section 5 are formed, for example, in a substantially elliptical shape corresponding to the angle in the up, down, left and right directions with the fixation point P as the center.

[0036] The dimensions of the effective visual field display section 4 and the induced visual field display section 5 are set as follows, for example, as shown in Figure 3. For the first effective visual field display section 41, for example, the width w1 in the upward direction from the gaze point P1 is 4 mm, the width w2 in the downward direction from the gaze point P1 is 6 mm, and the width w3 and width w4 in the left and right directions from the gaze point P1 are 8 mm. For the first induced visual field display section 51, for example, the width w5 in the upward direction from the gaze point P1 is 25 mm, the width w6 in the downward direction from the gaze point P1 is 30 mm, and the width w7 and width w8 in the left and right directions from the gaze point P1 are 35 mm.

[0037] The above dimensions of the effective visual field display unit 4 and the induction visual field display unit 5 show an example in which the distance between the user U's eyes and the effective visual field display unit 4 and the induction visual field display unit 5 is 30 mm. Therefore, the dimensions of the effective visual field display unit 4 and the induction visual field display unit 5 may be changed appropriately depending on, for example, the distance from the user U's eyes to the effective visual field display unit 4 and the induction visual field display unit 5, or the distance from the user U's eyes to the point of gaze P. Note that the farther the distance from the user U's eyes to the point of gaze P, the smaller the notification object O appears, and the larger the shapes of the effective visual field display unit 4 and the induction visual field display unit 5 become. Furthermore, the closer the distance from the user U's eyes to the point of gaze P, the larger the notification object O appears, and the smaller the shapes of the effective visual field display unit 4 and the induction visual field display unit 5 become.

[0038] The dimensions of the second effective field of view display section 42 may be the same as those of the first effective field of view display section 41. The dimensions of the second induction field of view display section 52 may be the same as those of the first induction field of view display section 51.

[0039] The dimensions of the effective visual field display unit 4 and the induced visual field display unit 5 may refer to the ranges shown in FIG. 4, for example. FIG. 4 is a schematic diagram based on an ellipse showing the visual field distribution described in the paper "The Relationship between Near-Field Information Acquisition and Pedestrian Behavior (Reports of the Japanese Society of Interior Design, Naoaki Yoshikawa, Hideaki Takayanagi, Shogo Yamada, and Kinto Kihara)" and "Toyohiko Hatada: Visibility of Visual Display Devices, Compiled by the National Institute of Advanced Industrial Science and Technology, Human Welfare and Medical Engineering Research Division - Human Measurement Handbook -," Asakura Shoten, 2003. According to this paper, the human visual system is broadly divided into two parts: high-resolution central vision and low-resolution peripheral vision. The high-resolution central vision area is within a horizontal range of approximately ±30 degrees and a vertical range of approximately ±20 degrees from the line of sight. The low-resolution peripheral vision area is within a horizontal range of approximately ±60 to 200 degrees and a vertical range of approximately ±20 to 130 degrees from the line of sight.

[0040] In Figure 4, the x-axis represents the horizontal visual axis in the visual field area, expressed as an angle [deg] of the visual field distribution, and the y-axis represents the vertical visual axis in the visual field area, expressed as an angle [deg] of the visual field distribution. The visual field distribution shown in Figure 4 includes a discrimination visual field R1, a useful visual field R2, an induced visual field R3, an auxiliary visual field R4, and a stable fixation visual field R5. Among the visual field types, central vision includes the discrimination visual field R1 and the useful visual field R2, while peripheral vision includes the induced visual field R3, the auxiliary visual field R4, and the stable fixation visual field R5.

[0041] The discriminative visual field R1 indicates the range where visual functions such as visual acuity and color discrimination are excellent and highly accurate information reception is possible. The visual field distribution of the discriminative visual field R1 is, for example, -5 <x<+5[deg]かつ-5<y<+5[deg]である。

[0042] The effective visual field R2 indicates the range within which information can be instantaneously received only by eye movement, corresponding to the effective visual fields f1 and f2 of the visual field evaluation device 1. The visual field distribution of the effective visual field R2 is, for example, -15 < x < +15 [deg] and -12 < y < +8 [deg]. The effective visual fields f1 and f2 in the visual field evaluation device 1 are the ranges within which information can be effectively obtained from the external world when fixating on the fixation points P1 and P2 near the center of the physiological visual field, and can also be said to be the ranges that satisfy the visibility requirements defined by existing presentation design guidelines.

[0043] The guiding visual field R3 indicates the range of the visual field area where the presence of visual information can be recognized, corresponding to the guiding visual fields g1 and g2 of the visual field evaluation device 1. The visual field distribution of the guiding visual field R3 is, for example, -50 < x < +50 [deg] and -45 < y < +40 [deg]. The guiding visual fields g1 and g2 in the visual field evaluation device 1 are the ranges where there is a possibility of not being able to effectively obtain information from the external world when fixating on the fixation points P1 and P2 near the center of the physiological visual field, and can also be said to be the ranges that need to satisfy the guiding property requirements in addition to the visibility requirements.

[0044] The auxiliary visual field R4 indicates the range where the information discrimination ability is low but visual information affects the spatial coordinate system. The visual field distribution of the auxiliary visual field R4 is, for example, ±50 < x < ±100 [deg], and -75 < y < -50 [deg] or +3 < y < +50 [deg].

[0045] The stable fixation visual field R5 indicates the range that can be fixated without difficulty by eye and head movement. The visual field distribution of the stable fixation visual field R5 is, for example, ±15 < x < ±45 [deg], and -40 < y < -25 [deg] or +20 < y < +30 [deg].

[0046] As the dimensions of the effective visual field display unit 4 and the guiding visual field display unit 5, for example, as shown in FIG. 5, they may be set based on the first angle θ1 or the second angle θ2 of the visual field calculated based on the positional relationship among the user U, the fixation point P, and the notification objects O (the first notification object O1 and the second notification object O2).

[0047] In Figure 5, the first angle θ1 indicates the visual field distribution [deg] of the effective visual field f1 in the horizontal direction centered on the gaze point P, and the second angle θ2 indicates the visual field distribution [deg] of the induced visual field g1 in the horizontal direction centered on the gaze point P. Line a indicates the distance from the convergence point U0 of the user U's visual field V, where the effective visual field f1 and the induced visual field g1 converge, to the gaze point P. Line b1 indicates the distance from the convergence point U0 to the first notification object O1 within the effective visual field f1. Line b2 indicates the distance from the convergence point U0 to the second notification object O2 outside the effective visual field f1 but within the induced visual field g1. Line c1 indicates the distance from the first notification object O1 to the gaze point P. Line c2 indicates the distance from the second notification object O2 to the gaze point P. Line d1 is the distance when a line perpendicular to the line connecting the convergence point U0 and the gaze point P is extended from the gaze point P relative to the line connecting the convergence point U0 and the first notification object O1. The line d2 is the distance when a line perpendicular to the line connecting the convergence point U0 and the gaze point P is extended from the gaze point P to the line connecting the convergence point U0 and the second notification object O2. The lines a, b1, b2, c1, c2, d1, and d2 are all variable values.

[0048] At this time, the first angle θ1=tan -1 (d1 / a), second angle θ2=tan -1 (d2 / a). For example, when the first angle θ1 is evaluated to be within the visual field f1, a requirement for visibility can be added to the first notification object O1. Also, when the second angle θ2 is evaluated to be outside the visual field f1 but within the guidance visual field g1, a requirement for increasing the conspicuity can be added to the second notification object O2.

[0049] Furthermore, when evaluating the visual field based on distances d1 and d2 on a plane including the fixation point P, the distances d1 and d2 may be calculated as d1 = a × tan(θ1) and d2 = a × tan(θ2), and the maximum angles of the effective visual field f1 and the induced visual field g1 may be converted into distances on a plane including the fixation point P for comparison. Note that the effective visual field f2 may be evaluated using the first angle θ1 or distance d1, as with the effective visual field f1. The induced visual field g2 may be evaluated using the second angle θ2 or distance d2, as with the induced visual field g1.

[0050] Here, the dimensions of the effective visual field display unit 4 and the induced visual field display unit 5 may be calculated by, for example, replacing the distance d1 with the above dimension, the straight line a with the separation distance a' from the convergence point U0 (the position of the user U's eyes) to the effective visual field display unit 4 and the induced visual field display unit 5, and the first angle θ1 with the angle [deg] of the visual field distribution in the above formula "distance d1 = a × tan(θ1)".

[0051] <Detachable fixing part 6> 1 and 6, the detachable fixing part 6 is a part that detachably fixes the transparent base 3 to the head fixing part 2. In addition to a clip, adhesive, hook-and-loop fastener, a magnet, etc. may also be used as the detachable fixing part 6. Note that the visual field evaluation device 1 does not need to include the detachable fixing part 6 if, for example, the transparent base 3 is firmly fixed to the head fixing part 2 with an adhesive or the like, or is integrally molded in advance.

[0052] The detachable fixing part 6 detachably fixes the transparent base 3 to, for example, the head fixing part 2. In this case, the position of the transparent base 3 on which the effective visual field display part 4 is displayed can be easily adjusted according to individual differences in head shape, thereby improving the accuracy of visual field evaluation.

[0053] 1, the detachable fixing part 6 may be a single clip that detachably fixes one sheet-shaped transparent base 3 to the head fixing part 2. For example, as shown in FIG. 2, when two sheet-shaped transparent bases 3 are detachably fixed, the detachable fixing part 6 may be a two clips that detachably fix each sheet independently.

[0054] <Effective visual field reference line display section 7> The effective visual field reference line display section 7 is a section for adjusting the position of the effective visual field display section 4.

[0055] 7, the effective visual field reference line display unit 7 has approximately elliptical reference lines (first reference line 71, second reference line 72, third reference line 73) that correspond to the shape of the effective visual field display unit 4. The effective visual field reference line display unit 7 is, for example, spaced apart from the transparent base 3 on the side opposite the eyes of the user U and displays the reference lines non-electronically. The effective visual field reference line display unit 7 is, for example, attached to a wall, and the display accuracy of the effective visual field display unit 4 can be corrected by aligning the position of the effective visual field display unit 4 with the reference lines when viewed by the user U who has positioned the effective visual field display unit 4 in front of his or her eyes.

[0056] The visual field reference line display unit 7 displays the reference line non-electronically, for example, at a distance from the transparent base 3. In this case, the position of the transparent base 3 on which the visual field display unit 4 is displayed can be precisely adjusted according to the difference between the visual fields f1 and f2 of the left and right eyes, thereby improving the accuracy of visual field evaluation.

[0057] The effective visual field reference line display unit 7 has, for example, a first reference line 71, a second reference line 72, and a third reference line 73. In Fig. 7, the first reference line 71 shown by a dashed dotted line corresponds to the effective visual field f1 of the left eye of the user U, the second reference line 72 shown by a dashed dotted line corresponds to the effective visual field f2 of the right eye of the user U, and the third reference line 73 shown by a solid line corresponds to the effective visual fields of both eyes of the user U.

[0058] The dimensions of the effective visual field reference line display section 7 are set as follows, for example, as shown in Fig. 7. For the third reference line 73, for example, the width x1 from the fixation point P of both eyes in the upward direction is 70.3 mm, the width x2 from the fixation point P in the downward direction is 106.3 mm, and the width x3 from the fixation point P to the left and the width x4 from the fixation point P to the right are 134 mm.

[0059] The above dimensions of the effective visual field reference line display unit 7 show an example in which the distance between the eyes of the user U and the gaze point P of the effective visual field reference line display unit 7 is 500 mm. Therefore, the dimensions of the effective visual field reference line display unit 7 may be calculated based on the distance from the eyes of the user U to the gaze point P of the effective visual field reference line display unit 7, similar to the effective visual field display unit 4 and the induced visual field display unit 5, for example.

[0060] The dimensions of the first reference line 71 and the second reference line 72 may be the same as the dimension of the third reference line 73. The first reference line 71 is disposed, for example, offset by a predetermined distance M to the left from the third reference line 73. The second reference line 72 is disposed, for example, offset by a predetermined distance M to the right from the third reference line 73. When the interpupillary distance m between the eyes of the user U is set to 63 mm based on the average interpupillary distance of humans, this predetermined distance M is M=m / 2=31.5 mm.

[0061] (How to use visual field evaluation device 1) An example of how to use the visual field evaluation instrument 1 according to this embodiment will be described with reference to the drawings.

[0062] <Adjustment of visual field evaluation device 1> To adjust the visual field evaluation device 1, a distance is set between the eye position of the user U and the gaze point P. Because the visual field evaluation device 1 can be used both indoors and outdoors, this distance may be set to any distance that can be seen by the user U. In addition, a notification object O to be used for visual field evaluation is set in advance.

[0063] First, the user U temporarily fixes the transparent base 3 to the head fixing part 2 (see FIG. 1) from the state before the transparent base 3 is fixed to the head fixing part 2 (see FIG. 6).

[0064] Next, the user U fine-tunes the position of the effective visual field display unit 4 using the effective visual field reference line display unit 7 as necessary. A reference line having dimensions corresponding to the distance between the notification object O and the eyes of the user U is non-electronically displayed in advance on the effective visual field reference line display unit 7. In addition, the effective visual field reference line display unit 7 is fixed to a wall or the like that is separated from the eyes of the user U by the above-mentioned distance.

[0065] The user U fine-tunes the position of the first effective visual field display section 41 corresponding to the left eye while viewing with the left eye so that it aligns with the position of the first reference line 71. The user U also fine-tunes the position of the second effective visual field display section 42 corresponding to the right eye while viewing with the right eye so that it aligns with the position of the second reference line 72. Next, the user U checks the first effective visual field display section 41 and the second effective visual field display section 42 with both eyes to confirm that they align with the positions of the third reference line 73 corresponding to both eyes.

[0066] This completes the adjustment of the visual field evaluation instrument 1.

[0067] <Visual field evaluation using visual field evaluation device 1> With the visual field evaluation device 1 attached to the user U's head, the user U looks at a point that will be the gaze point P from any position. The user U confirms that the effective visual field display unit 4 and the induced visual field display unit 5 are visible. At this time, if the user U can visually recognize the notification object O inside the approximate ellipse displayed by the effective visual field display unit 4, the user can determine that the notification object O is within the effective visual field f1, f2. Furthermore, if the user U can visually recognize the notification object O outside the approximate ellipse displayed by the effective visual field display unit 4 and inside the approximate ellipse displayed by the induced visual field display unit 5, the user can determine that the notification object O is within the induced visual field g1, g2.

[0068] Based on the evaluation results using the visual field evaluation device 1, if the location of the notification object O is within the effective visual fields f1 and f2, it is evaluated that the expression used for the notification information included in the notification object O is sufficient as long as it satisfies the visibility requirements stipulated in the existing expression design guidelines. On the other hand, if the location of the notification object O is outside the effective visual fields f1 and f2 but within the nearby guided visual fields g1 and g2, it is evaluated that the expression used for the notification information included in the notification object O needs to satisfy the visibility requirements stipulated in the existing expression design guidelines as well as the eye-catching evaluation.

[0069] In evaluating the visual field, for example, as shown in FIG. 8, when the notification object O is located to the right of the fixation point P as viewed by the user U, it is important to note that the actual position of the notification object O and the position recognized by the user U when viewing the notification object O with his / her right eye are visually shifted by a right eye shift angle α based on the position of the right eye. Also, as shown in FIG. 9, for example, it is important to note that the actual position of the notification object O and the position recognized by the user U when viewing the notification object O with his / her left eye are visually shifted by a left eye shift angle β based on the position of the left eye. This error occurs because the ranges of the effective visual fields f1 and f2 and the induced visual fields g1 and g2 are based on the centers of the left and right eyes of the user U. Similarly, when the notification object O is located to the left of the fixation point P as viewed by the user U, it is important to note that the actual position of the notification object O is visually shifted by the right eye shift angle α and the left eye shift angle β based on the position of the user U's eyes.

[0070] In the examples of Figures 8 and 9, in a plane consisting of the X-axis, a straight line passing through both eyes of user U, and the Y-axis, which passes through the center of both eyes of user U and point of gaze P and is perpendicular to the X-axis, the right eye position A of user U, the left eye position A', the center position B of both eyes, the intersection C of a line passing through alarm object O and parallel to the Y-axis with the X-axis, the intersection D of a line passing through alarm object O and parallel to the X-axis with the Y-axis, the intersection E of a line passing through right eye position A and parallel to line BO with line DO, the intersection E' of a line passing through left eye position A' and parallel to line BO with line DO, the intersection F of a line passing through alarm object O and perpendicular to line AE with line AE, the intersection F' of a line passing through alarm object O and perpendicular to line AE' with line AE', the angle θ corresponding to angle PBO, angle CBO = angle CAE = angle AEO = angle CAF = angle 90°-θ corresponding to angle F'E'O. The angle θ corresponds to the angle of the notification object O when the angle of the gaze point P is 0°. Furthermore, since the rectangles ABOE and A'BOE' are parallelograms, the AB length = the EO length, and the A'B length = the E'O length.

[0071] In this case, the right eye deviation angle α can be calculated as arctan(OF length / AF length). Note that it can be calculated as follows: OF length = EO length × sin(90°-θ) = AB length × cos(θ). Also, AF length = AE length - FE length = (BD length / sin(90°-θ)) - (EO length × cos(90°-θ)) = BD length / cos(θ) - AB length × sin(θ). In other words, the right eye deviation angle α can be calculated by setting the AB length, which corresponds to the distance between the center position B of the user U's eyes and one eye, as a constant, the BD length, which corresponds to the depth direction distance of the alarm object O, and the angle θ, which corresponds to the positional relationship between the gaze point P, the center position B of the eyes, and the alarm object O.

[0072] Furthermore, the left eye deviation angle β can be calculated as follows: β = arctan(OF' length / A'F' length). Note that the calculation can be performed as follows: OF' length = E'O length × sin(90°-θ) = A'B length × cos(θ). Furthermore, the calculation can be performed as follows: A'F' length = AE' length + E'F' length = (BD length / cos(θ)) + (E'O length × cos(90°-θ)) = BD length / cos(θ) + A'B length × sin(θ). In other words, the left eye deviation angle β can be calculated by setting the A'B length, which corresponds to the distance between the center position B of the user U's eyes and one eye, as a constant, the BD length, which corresponds to the depth direction distance of the notification object O, and the angle θ, which corresponds to the positional relationship between the gaze point P, the center position B of the eyes, and the notification object O.

[0073] According to the above formula, when AB length = 31.5 mm, A'B length = 31.5 mm, BD length = 1000 mm, and angle θ = 15°, the right eye deviation angle α = -1.70 [deg] and the left eye deviation angle β = +1.67 [deg]. Note that the right eye deviation angle α and the left eye deviation angle β indicate the deviation of the actual position of the alarm object O based on the intersection points E and E', so the right eye deviation angle α < 0 and the left eye deviation angle β > 0.

[0074] According to this embodiment, the visual field evaluation device 1 includes an effective visual field display unit 4 that displays the user U's effective visual fields f1 and f2 non-electronically on a transparent base 3. Therefore, whether or not the notification object O falls within the effective visual fields f1 and f2 can be determined without using electricity. This allows visual field evaluation to be performed in locations where the use of electronic devices is restricted. Furthermore, when the user U focuses their gaze on an arbitrary gaze point P, the effective visual field range can be seen at a glance, allowing anyone to easily determine the validity of whether or not the notification object O falls within the effective visual fields f1 and f2. This improves the usability of visual field evaluation.

[0075] Furthermore, according to this embodiment, the detachable fixing part 6 detachably fixes the transparent base 3 to the head fixing part 2. Therefore, the position of the transparent base 3 on which the effective visual field display part 4 is displayed can be easily adjusted according to individual differences in head shape, thereby improving the accuracy of visual field evaluation.

[0076] Furthermore, according to this embodiment, the visual field display unit 4 has a first visual field display unit 41 on the first transparent base 31 and a second visual field display unit 42 on the second transparent base 32 that is independent from the first transparent base 31. Therefore, the position of the visual field display unit 4 can be easily adjusted according to individual differences in the relative positions of the left and right eyes, thereby improving the accuracy of visual field evaluation.

[0077] Furthermore, according to this embodiment, the visual field reference line display unit 7 displays the reference line non-electronically, away from the transparent base 3. Therefore, the position of the transparent base 3 on which the visual field display unit 4 is displayed can be precisely adjusted according to the difference between the visual fields f1 and f2 of the left and right eyes, thereby improving the accuracy of visual field evaluation.

[0078] Although several embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be embodied in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and spirit of the invention, and are also included in the inventions and their equivalents set forth in the scope of the utility model registration claims. [Explanation of symbols]

[0079] 1 Visual field assessment equipment 2 Head fixation part 3 Transparent base 31 1st transparent base 32 Second transparent base 4 Effective field of view display 41 First effective field of view display unit 42 Second effective field of view display 5 Guidance field display section 51 1st guidance visual field display section 52 2nd guidance visual field display section 6 Detachable fixing part 7 Effective visual field reference line display section 71 First Reference Line 72 Second Reference Line 73 Third Reference Line U User f1, f2 effective field of view g1, g2 guided visual field R1 discrimination field R2 Effective field of view R3 guided field of view R4 auxiliary field of view R5 stable fixation field V field of view P gaze point O, O1, O2 notifications

Claims

1. A visual field assessment device used to assess a user's visual field, a head fixing part fixed to the user's head; a transparent base supported by the head fixing portion and positioned in front of the user's eyes; an effective visual field display unit on the transparent base that non-electronically displays the effective visual field of the user; To be prepared A visual field evaluation device characterized by:

2. a detachable fixing part for detachably fixing the transparent base to the head fixing part; 2. The visual field evaluation device according to claim 1,

3. The transparent base includes a first transparent base disposed in front of the user's left eye and a second transparent base disposed in front of the user's right eye, independent of the first transparent base; The effective visual field display unit includes a first effective visual field display unit that displays the effective visual field of the left eye non-electronically on the first transparent base, and a second effective visual field display unit that displays the effective visual field of the right eye non-electronically on the second transparent base.

3. The visual field evaluation instrument according to claim 1 or 2,

4. The effective visual field reference line display unit is provided to non-electronically display a reference line for adjusting the position of the effective visual field display unit on the transparent base, the reference line being spaced apart from the transparent base on the side opposite to the eye.

3. The visual field evaluation instrument according to claim 1 or 2,

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