Forehead abutment and ophthalmic device

Abstract

Provided is an ophthalmic apparatus having a forehead abutting portion with which a subject can easily align the forehead and the forehead abutting portion in position, and the forehead abutting portion. A forehead abutting portion (14c) provided to an ophthalmic apparatus (slit lamp microscope (10)) for a subject (H) to abut the forehead against, has a forehead abutting surface (64) to abut against the forehead, and left and right edge forming surfaces (66) connected to both end sides in the left and right direction (X direction) of the forehead abutting surface (64), and left and right edge portions (70) formed between the forehead abutting surface (64) and the left and right edge forming surfaces (66) on both end sides of the forehead abutting surface (64).

Description

Technical Field

[0001] The present invention relates to a forehead abutment that supports the forehead of a person being examined, and an ophthalmic device having the forehead abutment. Background Technology

[0002] As an ophthalmic device installed in ophthalmology departments, a slit-lamp microscope (also known as a Slit Lamp or SlitLamp Microscope) is known. This slit-lamp microscope uses slit light (also known as a slit light) to cut a light section of the gaze area of ​​the examined eye, thereby enabling observation of the cross-section of the gaze area or obtaining an image of that cross-section (see Patent Documents 1 and 2). Thus, the examiner can observe the gaze area of ​​the examined eye.

[0003] The slit-lamp microscopes described in Patent Documents 1 and 2 include a face support for fixing the subject's face while the examiner observes the gaze area of ​​the examined eye. This face support typically includes a chin rest for supporting the subject's chin and a forehead rest for the subject's forehead to rest against.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 2008-259544

[0007] Patent Document 2: Japanese Patent Application Publication No. 2014-23868 Summary of the Invention

[0008] The problem the invention aims to solve

[0009] When the examinee rests their forehead against the forehead contact portion described in Patent Documents 1 and 2, the position of the examinee's forehead may deviate to the left or right relative to the forehead contact portion. In this state of forehead deviation, it may be impossible to align the optical axis of the slit-lamp microscope with the examined eye, or the examinee's face may move while the examiner is observing the area of ​​the examined eye.

[0010] The present invention was made in view of the following circumstances, and its object is to provide a forehead abutment that allows the examinee to easily align the forehead with the forehead abutment in the appropriate position, and an ophthalmic device having the forehead abutment.

[0011] means for solving problems

[0012] A forehead contact portion for achieving the purpose of the present invention is provided in an ophthalmic device for the forehead of the examinee to abut against, wherein it has: a forehead contact surface that abuts against the forehead; and left and right edge forming surfaces that are connected to the two ends of the forehead contact surface in the left and right directions, and left and right edge portions are formed between the forehead contact surface and the two ends of the forehead contact surface.

[0013] According to this forehead contact portion, when the examinee's forehead deviates to the left or right from an appropriate position relative to the forehead contact surface, one of the left or right edges can be made to contact the forehead with an upright edge.

[0014] In another embodiment of the forehead contact portion of the present invention, when the forehead is in an appropriate position relative to the forehead contact surface, the left and right edge portions abut against the forehead via the forehead contact surface forming the edge portions. When the forehead deviates from the appropriate position relative to the forehead contact surface in the left and right directions, one of the left and right edge portions abuts against the forehead in a state where its edge is raised compared to the appropriate position. Thus, the person being examined can become aware that the position of the forehead has deviated from the appropriate position in the left and right directions.

[0015] In other embodiments of the present invention, the forehead abutment portion has a forehead abutment portion body, and a forehead abutment surface and left and right edge forming surfaces are formed on the forehead abutment portion body.

[0016] In another embodiment of the present invention, the forehead abutment body has: a front surface of the body and a protrusion that protrudes from a portion of the front surface of the body toward the front side of the front surface of the body, having an upper surface and a side surface; the forehead abutment surface is the upper surface, and the left and right edge forming surfaces are the left and right side surfaces of the protrusion.

[0017] In another embodiment of the present invention, the forehead abutment portion has a front surface of the main body and a recessed surface recessed in a portion of the front surface of the main body, the forehead abutment surface is the recessed surface, and the left and right edge forming surfaces are the regions on both sides of the forehead abutment surface in the front surface of the main body.

[0018] In other embodiments of the present invention, the forehead contact surface is a concave curved surface.

[0019] In other embodiments of the present invention, the forehead abutment surface is tilted forward towards the front side of the forehead abutment surface when viewed from a side view perspective from the left and right directions.

[0020] In another embodiment of the forehead contact portion of the present invention, the forehead contact surface is a mirror-finished surface. This enhances the tightness (feel) when the examinee brings their forehead to the forehead contact surface, making it easier for the examinee to perceive that their forehead is moving away from the forehead contact surface. Consequently, the examinee is more likely to perceive that their forehead is deviating to the left or right relative to the forehead contact surface. Furthermore, the tactile sensation is also improved when the examinee brings their forehead to the forehead contact surface.

[0021] The ophthalmic device for achieving the purpose of the present invention has the above-described forehead contact portion.

[0022] The effects of the invention

[0023] This invention enables the examinee to easily align their forehead with the forehead contact point in the appropriate position. Attached Figure Description

[0024] Figure 1 This is a side view of a slit-lamp microscope.

[0025] Figure 2 This is a three-dimensional view of the facial support structure when viewed from the side of the examinee.

[0026] Figure 3 This is a three-dimensional view of the forehead contact area when viewed from the examinee's side.

[0027] Figure 4 This is a cross-sectional view of the forehead abutment portion cut open with the YZ plane at the center position in the X direction.

[0028] Figure 5 This is an explanatory diagram illustrating the contact state of the left and right edges of the subject's forehead relative to the forehead when the forehead abutment surface is in an appropriate position.

[0029] Figure 6 This is an explanatory diagram illustrating the contact state of the left and right edges of the subject's forehead relative to the forehead when the forehead deviates from its proper position in the X direction relative to the forehead contact surface.

[0030] Figure 7 This is an explanatory diagram illustrating the optimal shape for the left and right edges.

[0031] Figure 8 This is a top view of the forehead contact portion of the slit-lamp microscope according to the second embodiment.

[0032] Figure 9 This is an explanatory diagram illustrating the contact state of the left and right edges relative to the forehead of the examinee in an appropriate state.

[0033] Figure 10This is an explanatory diagram illustrating the contact state of the left and right edges relative to the forehead of the examinee in a positional deviation state. Detailed Implementation

[0034] [First Implementation Method]

[0035] Figure 1 This is a side view of the slit-lamp microscope 10. The slit-lamp microscope 10 corresponds to the ophthalmic device of the present invention and is used for various observations of the examined eye E, such as corneal observation, fundus observation, and lens observation. In addition, the slit-lamp microscope 10 is also used for direct observation of the corneal endothelial cells of the examined eye E. Furthermore, in the figure, the X direction is the left-right direction (interpupillary distance direction of the examined eye E) with the examinee (patient) as the reference, and the Y direction is the up-down direction. Additionally, the Z direction, orthogonal to both the X and Y directions, is the front-back direction (movement distance direction) parallel to the front direction closer to the examinee and the back direction farther from the examinee.

[0036] like Figure 1 As shown, the slit-lamp microscope 10 is a known Zeiss (Littman) type. The slit-lamp microscope 10 has a base 12, a face support 14, a movable stage 18, an operating lever 20, a support member 22, a microscope support arm 24, a rotation shaft 26, an illumination support arm 28, an illumination system 32, and a microscope 34.

[0037] The base 12 is placed on an optometry table (not shown). A face support 14 is provided on the upper surface of the base 12 at the front end on the subject's side (the side of the eye being examined, E side). In addition, the movable worktable 18 is held by the upper surface of the base 12 in a manner that allows it to move freely in the XZ direction (left-right and front-back directions).

[0038] Figure 2 This is a three-dimensional view of the facial support 14 as observed from the examinee's side. Figure 2 As shown, the face support 14 includes: a pair of pillars 14a fixed to the base 12 and extending in the Y direction; a chin rest 14b disposed in the middle of the pair of pillars 14a; and a forehead abutment 14c disposed at the upper end of the pair of pillars 14a. The examinee places their chin on the chin rest 14b and abuts their forehead against the forehead abutment 14c, thereby supporting the examinee's face with the face support 14. This fixes the position of the examined eye E.

[0039] Return to Figure 1 An operating lever 20 is provided on the upper surface of the movable worktable 18 and at its rear end on the rearward side (inspector side). Furthermore, a support member 22 is provided on the upper surface of the movable worktable 18 in a manner that allows it to move (rise and fall) in the Y direction.

[0040] The operating lever 20 is an operating component for manually moving the support member 22 (illumination system 32 and microscope 34) in the XYZ directions respectively. For example, by moving or tilting the operating lever 20 in the Z or X directions, the movable worktable 18 can be manually moved in the Z or X directions. Furthermore, by rotating the operating lever 20 about its axis, the support member 22 can be moved in the Y direction via a drive transmission mechanism (not shown). Additionally, a switch 20a for purposes such as taking pictures is provided at the top of the operating lever 20.

[0041] A rotating shaft 26 extending in the Y direction is provided at the front end of the support member 22, and a microscope support arm 24 and an illumination support arm 28 are mounted on the rotating shaft 26. The microscope support arm 24 is formed in a generally L-shape, having a horizontal arm portion 24a and a vertical arm portion 24b.

[0042] The front end of the horizontal arm 24a is mounted on the support member 22 in a horizontally rotatable manner via a rotation shaft 26 extending in the Y direction. Additionally, the illumination support arm 28 is mounted on the horizontal arm 24a in a horizontally rotatable manner via the rotation shaft 26. Thus, the microscope support arm 24 and the illumination support arm 28 are rotatably mounted on a common rotation shaft 26.

[0043] Furthermore, the horizontal rotation of the microscope support arm 24 and the illumination support arm 28 centered on the rotation axis 26 can be performed manually by the examiner or electrically by using an electric rotation mechanism (not shown).

[0044] A microscope 34 is mounted on the upper end of the vertical arm 24b. Additionally, an illumination system 32 is provided on the illumination support arm 28.

[0045] The lighting system 32 includes a slit lamp 44 and a deflecting optical element 48. The slit lamp 44 is mounted on a lighting support arm 28 and emits illumination light L1 toward the deflecting optical element 48. The slit lamp 44 houses a light source (not shown) and an optical system for emitting illumination light L1 toward the deflecting optical element 48.

[0046] The deflecting optical element 48 is a prism or mirror positioned above the slit lamp 44. This deflecting optical element 48 deflects (including reflection) the illumination light L1 emitted from the slit lamp 44 toward the examined eye E. Thus, a slit-shaped illumination light L1 (also called slit light or slit beam) is irradiated onto the examined eye E from the deflecting optical element 48. Furthermore, the deflecting optical element 48 is shaped so that the return light L2 from the examined eye E has no vignetting. Therefore, the return light L2 from the examined eye E passes through both sides of the deflecting optical element 48 and enters the microscope 34.

[0047] Furthermore, the slit lamp 44 is not limited to Figure 1 The structure shown is not particularly limited in shape, structure, or configuration, as long as it can be used in a Zeiss slit-lamp microscope 10.

[0048] The illumination system 32 rotates horizontally around the rotation axis 26, integrally with the illumination support arm 28. This allows for adjustment of the illumination direction of the illumination light L1 relative to the examined eye E.

[0049] Microscope 34 is used for observation of the examined eye E, etc. When illumination light L1 is shone on the examined eye E from illumination system 32, the reflected light L2 from the examined eye E is incident on microscope 34. An objective lens 50 is provided at the front end of microscope 34 on the front direction side (examined eye E side in the Z direction), and an eyepiece 52 is provided at the rear end on the rear direction side (examiner side in the Z direction). In addition, a known optical system for observing the examined eye E is housed inside microscope 34 (illustration omitted).

[0050] The microscope 34 rotates horizontally around the rotation axis 26, integrally with the microscope support arm 24. This allows adjustment of the microscope 34's observation direction of the examined eye E. Furthermore, a digital camera 56 is installed in the microscope 34 to capture images of the examined eye E via the microscope 34's optical system.

[0051] Figure 3 This is a three-dimensional view of the forehead contact area 14c as observed from the examinee's side. (Example) Figure 3 and the above Figure 2 As shown, the forehead contact portion 14c has a forehead contact portion body 60, a protrusion 62, a forehead contact surface 64, and left and right edge forming surfaces 66.

[0052] When viewed from the Y-direction side, the forehead abutment body 60 is formed into a generally curved plate shape that convexes rearward in the Z-direction towards the main body (ophthalmic device body) of the slit-lamp microscope 10, such as the illumination system 32 and the microscope 34. Furthermore, the shape of the forehead abutment body 60 is not particularly limited, and for example, it can be formed into a flat plate shape.

[0053] Mounting holes 60a are formed at both ends of the forehead abutment body 60 in the X direction (left-right direction), for mounting the upper ends of a pair of support pillars 14a. Additionally, the forehead abutment body 60 has a front surface 60b facing the forehead of the examinee. This front surface 60b has a generally concave curved shape along the front surface side of the examinee's head. Furthermore, a protrusion 62, which is part of the front surface 60b, protrudes forward toward the examinee's side (Z-direction front side) at the center in the X direction, and is integrally formed with the forehead abutment body 60.

[0054] At the center of the front surface 60b of the main body in the X direction, the protrusion 62 is formed into a generally curved plate shape with thickness on the front side in the Z direction and following the shape of the front surface 60b of the main body. The upper surface of the front side of the protrusion 62 in the Z direction is a forehead contact surface 64 that abuts against the forehead of the examinee. In addition, the side surfaces of the two ends (left and right) of the protrusion 62 in the X direction are left and right edge forming surfaces 66 that connect with the two ends of the forehead contact surface 64 in the X direction.

[0055] The forehead contact surface 64 is formed at a position further forward in the Z direction than the front surface 60b of the main body. This forehead contact surface 64 is shaped to match the curvature of the examinee's forehead and to support the examinee's face; that is, it is formed as a concave surface. Furthermore, for contact with the forehead, the forehead contact surface 64 is formed of a biocompatible material.

[0056] Furthermore, the forehead contact surface 64 is formed with a mirror finish. Therefore, because the degree of contact (closer feeling) is enhanced when the examinee places their forehead against the forehead contact surface 64, the examinee is more likely to perceive that their forehead is moving away from the forehead contact surface 64. As a result, the examinee is more likely to perceive that their forehead is deviating to the left or right relative to the forehead contact surface 64. Additionally, the tactile sensation when placing the forehead against the forehead contact surface 64 is improved. Furthermore, a rubber film or silicone film, or a non-woven fabric that can be detachably attached, can be attached to the forehead contact surface 64.

[0057] Figure 4 This is a cross-sectional view of the forehead abutment portion 14c, cut along the YZ plane at its center position in the X direction. Furthermore, reference numeral H in the figure indicates the subject being examined. Figure 4 As shown, from a side viewpoint observed in the X direction (left-right direction), the forehead contact surface 64 is approximately straight, tilting forward in the Z direction along the forehead of the examinee H. Specifically, if we define "K" as the straight line parallel to the Y direction that passes through the center position of the upper end of the forehead contact surface 64 in the X direction, the tilt angle θ of the forehead contact surface 64 relative to the straight line K is, for example, θ = 18°.

[0058] Return to Figure 2 as well as Figure 3 The left and right edge forming surfaces 66 are inclined surfaces that connect the two ends of the forehead abutment surface 64 in the X direction to the front surface 60b of the main body, and are inclined backward in the Z direction relative to the forehead abutment surface 64. Through these forehead abutment surfaces 64 and the left and right edge forming surfaces 66, left and right edge portions 70 are formed at the two ends of the forehead abutment surface 64 in the X direction.

[0059] Figure 5This is an explanatory diagram illustrating the contact state between the left and right edges 70 and the forehead when the forehead of the examinee H is in proper contact with the forehead contact surface 64. Figure 6 This is an explanatory diagram illustrating the contact state between the left and right edges 70 and the forehead when the forehead of the examinee H deviates from its proper position in the X direction relative to the forehead contact surface 64.

[0060] like Figure 5 As shown, in the appropriate state (hereinafter referred to as the appropriate state) where the forehead of the examinee H is in contact with the forehead contact surface 64 at an appropriate position, the left and right edge portions 70 contact the forehead surface only through the forehead contact surface 64 constituting the edge portions 70. That is, the left and right edge portions 70 contact the forehead in a state where the edges are in close contact. As a result, the examinee H is unlikely to realize that the forehead is in contact with the left and right edge portions 70, and therefore, the examinee H can be given the tactile sensation that the forehead is tucked into the appropriate position of the forehead contact surface 64.

[0061] On the other hand, such as Figure 6 As shown, on the forehead of the examinee H, relative to the forehead contact surface 64, from... Figure 5 In the positional deviation state (hereinafter referred to as the positional deviation state) where the appropriate state is deviated in the X direction (left and right direction), one of the left and right edges 70 (the edge 70 on the deviation direction side) comes into contact with the forehead in a state where the edge is raised compared to the appropriate state (refer to lead line A1). As a result, the examinee H can realize that the position of his forehead has deviated from the appropriate state in one direction in the X direction by being aware of the contact with the edge 70.

[0062] Figure 7 This is an explanatory diagram illustrating the optimal shape of the left and right edge portions 70 (forehead contact surface 64). For example... Figure 7 As shown, the inventors envisioned various foreheads of subjects H and repeatedly conducted experiments and simulations. The result was the discovery of a shape for the left and right edge portions 70 that, under appropriate conditions, prevents the subject H from being aware of contact with the left and right edge portions 70, but allows the subject H to be aware of contact with one of the left or right edge portions 70 when the position is deviated. Specifically, the X-direction width W (left-right direction width) of the left and right edge portions 70, i.e., the X-direction width W of the forehead contact surface 64, is set to 70 mm. Furthermore, the radius of curvature R of the forehead contact surface 64 constituting the left and right edge portions 70 is set to 100 mm.

[0063] As described above, in the slit-lamp microscope 10 of the first embodiment, left and right edge portions 70 are provided at both ends of the forehead contact surface 64 in the X direction. In an appropriate state, the left and right edge portions 70 are in contact with the forehead of the examinee H in a state of edge-to-edge contact. In a state of positional deviation, the left and right edge portions 70 are in contact with the forehead in a state of edge-up contact. Thus, the examinee H can easily determine whether the position of the forehead relative to the forehead contact surface 64 is appropriate. Therefore, in the case of positional deviation, the examinee H can be prompted to correct the position of the forehead to the appropriate position. As a result, the examinee H can easily align the forehead with the forehead contact surface 64 in the appropriate position.

[0064] Furthermore, since it is only necessary to provide left and right edge portions 70 at both ends of the forehead contact surface 64 in the X direction of the forehead contact portion 14c, it can be achieved at low cost.

[0065] [Second Implementation]

[0066] Figure 8 This is a top view of the forehead abutment portion 14c of the slit-lamp microscope 10 according to the second embodiment. In the forehead abutment portion 14c of the first embodiment, a protrusion 62 is provided protruding from the front surface 60b of the main body 60 of the forehead abutment portion body, forming a forehead abutment surface 64, left and right edge forming surfaces 66, and left and right edge portions 70. In contrast, in the forehead abutment portion 14c of the second embodiment, a forehead abutment surface 80 is recessed from the front surface 60b of the main body, forming left and right edge portions 82.

[0067] Furthermore, the slit-lamp microscope 10 of the second embodiment is structurally basically the same as the slit-lamp microscope 10 of the first embodiment, except that a forehead abutment surface 80 and left and right edge portions 82 are formed in the forehead abutment portion 14c. Therefore, for components that are functionally or structurally the same as those in the first embodiment, the same reference numerals are used and their descriptions are omitted.

[0068] The forehead abutment surface 80 is a recessed surface formed by concavely recessing the central portion of the front surface 60b of the main body in the X direction towards the rearward side in the Z direction. This forehead abutment surface 80 is formed with the same shape as the forehead abutment surface 64 of the first embodiment described above (concave curved surface, mirror-finished shape, X-direction width W, radius of curvature R). Therefore, the forehead of the examinee H can be supported by the forehead abutment surface 80.

[0069] In the second embodiment, the regions on both ends of the front surface 60b of the main body in the X direction are connected to both ends of the forehead abutment surface 80 in the X direction, and are inclined relative to the two ends of the forehead abutment surface 80 in the X direction towards the rearward side in the Z direction. Therefore, left and right edge portions 82 are formed on both ends of the forehead abutment surface 80 in the X direction through the forehead abutment surface 80 and the front surface 60b of the main body.

[0070] Figure 9 This is an explanatory diagram illustrating the contact state between the left and right edges 82 and the forehead of the subject H in an appropriate state. Figure 10 This is an explanatory diagram illustrating the contact state between the left and right edges 82 and the forehead of the examinee H in a positional deviation state.

[0071] like Figure 9 As shown, in an appropriate state, the left and right edge portions 82 only contact the forehead surface through the forehead contact surface 80 constituting the edge portions 82. That is, the left and right edge portions 82 contact the forehead in a state where the edges are flush. Thus, similar to the first embodiment described above, it is possible to give the examinee H the tactile sensation that the forehead is contained in the appropriate position on the forehead contact surface 80.

[0072] On the other hand, such as Figure 10 As shown, in the positional deviation state, one of the left and right edge portions 82 (the edge portion 82 on the deviation direction side) comes into contact with the forehead of the examinee H in a state where the edge is raised higher than in the proper state (refer to lead line A2). Thus, similar to the first embodiment described above, the examinee H can be aware that the position of the forehead has deviated from the proper state to one side in the X direction.

[0073] As described above, in the slit-lamp microscope 10 of the second embodiment, under appropriate conditions, the left and right edge portions 82 are in contact with the forehead of the examinee H in a state of edge-to-edge contact, and under positional deviation conditions, the left and right edge portions 82 are in a state of edge-up contact with the forehead. Therefore, the examinee H can easily determine whether the position of the forehead relative to the forehead contact surface 80 is appropriate. As a result, the same effect as described in the first embodiment can be obtained.

[0074] [other]

[0075] In the above embodiments, the forehead abutment portion 14c is configured to extend across the upper ends of a pair of pillars 14a. However, for example, a rod-shaped support member may be connected to the back side of the forehead abutment portion 14c (see, for example, Japanese Patent Application Publication No. 2022-64300).

[0076] In the above embodiments, a Zeiss (Littman) type slit lamp microscope 10 in which the slit lamp 44 (light source) of the illumination system 32 is disposed below the deflecting optical element 48 has been described as an example. However, the present invention can also be applied to a Haag (Goldmann) type slit lamp microscope 10 in which the slit lamp 44 is disposed above the deflecting optical element 48.

[0077] In the above embodiments, the forehead contact portion 14c of the slit-lamp microscope 10 has been described as an example, but the present invention can also be applied to the forehead contact portion 14c provided in various ophthalmic devices (including surgical devices) used for observation of the examined eye E, acquisition of various eye characteristics, and surgery.

[0078] Explanation of reference numerals in the attached figures

[0079] 10: Slit-lamp microscope,

[0080] 12: Base

[0081] 14: Facial support

[0082] 14a: pillar,

[0083] 14b: Chinrest area,

[0084] 14c: Forehead contact area,

[0085] 16: Electric drive unit

[0086] 18: Movable worktable

[0087] 20: Control lever,

[0088] 20a: Switch,

[0089] 22: Supporting components

[0090] 24: Microscope support arm

[0091] 24a: Horizontal arm,

[0092] 24b: Vertical arm,

[0093] 26: Rotating shaft

[0094] 28: Lighting support arm 28,

[0095] 32: Lighting system

[0096] 34: Microscope,

[0097] 38: Manual operating unit

[0098] 44: Slit lamp,

[0099] 48: Deflecting optical elements

[0100] 50: Objective lens,

[0101] 52: Eyepiece,

[0102] 56: Digital cameras

[0103] 60: The main body of the forehead contact area,

[0104] 60a: Mounting holes,

[0105] 60b: Front surface of the main body,

[0106] 62: Protrusion,

[0107] 64: Forehead contact surface,

[0108] 64a: Normal,

[0109] 66: Edge forming surface

[0110] 70: Edges,

[0111] 80: Forehead contact surface,

[0112] 82: Edges

[0113] A1: Lead wire,

[0114] A2: Lead wire,

[0115] E: The eye being examined

[0116] H: The person being inspected

[0117] K: Line,

[0118] L1: Illumination light

[0119] L2: Return light,

[0120] R: radius of curvature

[0121] W: Width in the X direction

[0122] θ: Inclination angle.

Claims

1. A forehead abutting portion provided to an ophthalmic apparatus, for a forehead of a subject to abut against, characterized by, has: a forehead abutting surface that abuts against the forehead, and left and right edge forming surfaces that connect both end sides in a left and right direction of the forehead abutting surface, form left and right edge portions at the both end sides of the forehead abutting surface, between the forehead abutting surface, and the forehead abutting surface; the forehead abutting surface is a curved surface that is convex toward a rear side in a front and rear direction of the forehead abutting surface, the edge forming surface is inclined toward a rear side in the front and rear direction of the forehead abutting surface with respect to the both end sides of the forehead abutting surface, in a proper state in which the forehead is positioned at an appropriate position with respect to the forehead abutting surface, the left and right edge portions are in contact with the forehead abutting surface via the forehead abutting surface that forms the edge portions, in a position deviated state in which the forehead deviates from the proper state toward the left and right direction with respect to the forehead abutting surface, one of the left and right edge portions is in a state of standing up an edge more than in the proper state, with respect to the forehead abutting surface.

2. The forehead abutting portion according to claim 1, characterized by having a forehead abutting portion main body in which the forehead abutting surface and the left and right edge forming surfaces are formed.

3. The forehead abutting portion according to claim 2, characterized by the forehead abutting portion main body has: a main body front surface, and a protruding portion that protrudes from a portion of the main body front surface toward a front side of the main body front surface, has an upper surface and side surfaces; the forehead abutting surface is the upper surface, and the left and right edge forming surfaces are the left and right side surfaces of the protruding portion.

4. The forehead abutting portion according to claim 2, characterized by the forehead abutting portion main body has a main body front surface and a recessed surface that is recessed in a portion of the main body front surface, the forehead abutting surface is the recessed surface, the left and right edge forming surfaces are regions of the main body front surface on the both end sides of the forehead abutting surface.

5. The forehead abutting portion according to any one of claims 1 to 4, characterized in that the forehead abutting surface is a concave curved surface.

6. The forehead abutting portion according to claim 5, characterized in that in a side view perspective of the forehead abutting surface from the left and right direction, the forehead abutting surface is inclined forward toward a front side of the forehead abutting surface.

7. The forehead abutting portion according to any one of claims 1 to 4, characterized in that the forehead abutting surface is a mirror finished surface.

8. An ophthalmic device, characterized by, having the forehead abutting portion according to any one of claims 1 to 4.

Images