Support device for supporting an optotype

Abstract

The invention relates to a support device (100) for supporting an optotype (102) for an examination of the near vision of a subject, the support device comprising: - an attachment means (110) intended to receive a near-vision test bar (15) fixed to a refractor head (12), the attachment means comprising a partly open hook (115) extending from a base (112), the hook having an inner surface provided with a bearing portion on which the near-vision test bar is adapted to bear, the bearing portion having a cross section with a broken-line shape formed by a hexagonal portion and a square portion, the hexagonal portion being intersected by the square portion such that the square portion forms a notch in the hexagonal portion; and - a support portion (130) for supporting the optotype mounted on the base of the attachment means.

Description

DESCRIPTION TITLE: Optotype support device TECHNICAL FIELD OF THE INVENTION

[0001] The technical field of the invention relates generally to vision examinations of a subject, and more particularly to systems enabling the implementation of these vision examinations.

[0002] In particular, the invention relates to a support device for an optotype used in vision testing. The invention finds a particular application in near vision testing. TECHNOLOGICAL BACKGROUND OF THE INVENTION

[0003] As part of a subject's vision examinations, it is common to test both a subject's distance vision and their near vision.

[0004] Vision tests are generally performed using a refractor head (manual or automatic). An example of a known refractor head is shown in Figure 1. This refractor head allows lenses to be positioned in front of one or both of a patient's eyes to test their distance and / or near vision. An optotype is placed in front of the subject's eyes (whether fitted with lenses or not).

[0005] In the case of a distance vision test, the optotype is projected a few meters from the subject. No additional setup is required.

[0006] In the case of a near vision examination, the optotype is positioned at a predetermined distance and close to the subject. Generally, the optotype is placed within 50 centimeters of the subject's eyes. In practice, the optotype 4 is held by a support device 3, which is itself supported by a support bar 2 extending from the refractor head 1. Figure 1 illustrates such an arrangement.

[0007] However, the system formed by the support bar 2 and the support device 3 is specific to each refractor head 1. For example, since the support bar 2 is fixed to the refractor head 1, the shape of the support bar 2 is determined by this interaction. It is generally a square, hexagonal, or circular shape. The shape of the support bar then depends on the Refractor head manufacturer 1. In other words, each manufacturer offers its own unique system, consisting of the support bar and mounting device, which cannot be interchanged with a system developed by another manufacturer. Furthermore, there are dozens of different systems and manufacturers on the market.

[0008] Furthermore, in order to position the optotype 4 on the support bar 2, the support device 3 must be slid onto the support bar 2 through an opening 5 equipped with a mounting means. This mounting means is also specific to the support bar 2 being used. Thus, if the practitioner does not have the specific support bar for the refractor head and the corresponding support device, they will not be able to perform the near vision examination of the subject under optimal conditions (i.e., without having to hold the support device and simultaneously select the lenses positioned in front of the subject's eyes). SUMMARY OF THE INVENTION

[0009] The present invention provides a support device for a universal optotype, meaning that it can be adapted to any support bar and therefore used regardless of the refractor head available. Furthermore, the support device according to the present invention is easy to attach and remove once the near vision examination is complete.

[0010] One aspect of the invention relates to a support device for an optotype for examining a subject's near vision, the support device comprising:

[0011] - a fastening means for receiving a near vision test bar fixed to a refractor head, the fastening means comprising a partially open hook extending from a base, the hook having an internal surface provided with a bearing portion on which the near vision test bar is adapted to rest, the bearing portion having a cross-section in the shape of a broken line formed by a superposition of:

[0012] a) a hexagonal part comprising:

[0013] a1) a first vertex and a second vertex,

[0014] a2) at least a portion of a first edge extending from the first vertex, the first edge not passing through the second vertex,

[0015] a3) at least a portion of a second edge extending from the second vertex, the second edge not passing through the first vertex, and

[0016] a4) a third edge extending between the first vertex and the second vertex, and

[0017] b) a square part comprising:

[0018] b1) a corner,

[0019] b2) a first portion of the side extending from the corner, and

[0020] b3) a second side section extending from the corner,

[0021] the third edge of the hexagonal part being intersected by the square part in such a way that the square part forms a notch in the hexagonal part, and

[0022] - a support part of the optotype mounted on the base of the attachment means.

[0023] Thus, advantageously, the support device according to the invention provides a means of attaching the universal test bar, which has a support part with a support imprint adapted to cooperate with different shapes and dimensions of test bars, for example (and not limited to) square, hexagonal, circular, elliptical or oblong.

[0024] The optotype support device is therefore not limited to a single manufacturer or a single model of refractor head to implement the examination of the subject's near vision.

[0025] Furthermore, the optotype support device according to the invention is easy to install on the support bar and to remove once the examination is complete.

[0026] In addition to the characteristics mentioned above, the support device according to the invention may have one or more additional characteristics from among the following, considered individually or in all technically possible combinations:

[0027] - the internal surface of the hook has, on both sides of the support part, a circular cross-section;

[0028] - the circular cross-section has a radius greater than 6 millimeters;

[0029] - a first tangent to the circular cross-section being defined at the level of a first end of the support part and a second tangent to the circular cross-section being defined at the level of a second end of the support part, the first tangent and the second tangent are orthogonal to each other;

[0030] - the hook has, in a portion opposite the support part, a through orifice for receiving a means of clamping the near vision test bar against the internal surface of the hook;

[0031] - the clamping means comprises a screw having a metric thread, an internal surface of the through orifice being tapped so as to cooperate with the screw;

[0032] - the screw contains nylon;

[0033] - the screw has a length greater than 4 millimeters;

[0034] - on the one hand, the base of the attachment means comprises two magnets positioned symmetrically with respect to each other, and on the other hand, the support part comprises, at a free end positioned opposite the base of the attachment means, two other magnets positioned symmetrically with respect to each other and adapted to interact with the two magnets of the base of the attachment means so as to maintain the support part in a predefined position;

[0035] - the attachment means and the support part are mounted to rotate movably relative to each other;

[0036] - the hook of the attachment means comprises a polymer material;

[0037] - the hook of the attachment device is manufactured by molding or additive manufacturing;

[0038] - the hook of the hanging means includes a metallic material;

[0039] - the base of the attachment means comprises a polymer material; and

[0040] - a minimum distance between the two free ends of the hook is greater than 8 millimeters.

[0041] Another aspect of the invention relates to an implementation assembly for a near vision examination of a subject comprising a refractor head, a near vision test bar and a support device for an optotype as previously introduced. BRIEF DESCRIPTION OF THE FIGURES

[0042] Other features and advantages of the invention will become apparent from the description, which can be read in conjunction with the figures. These figures are provided for illustrative purposes only and are not intended to limit the scope of the invention.

[0043] [Fig. 1] Figure 1 represents a schematic view of a set of implementations for a near vision examination of a subject according to the state of the art,

[0044] [Fig. 2] Figure 2 represents a schematic view of an implementation assembly for a near vision examination of a subject according to the invention,

[0045] [Fig. 3] Figure 3 shows a schematic view of a support device for an optotype according to the invention,

[0046] [Fig. 4] Figure 4 shows a schematic perspective view of an attachment means according to the invention,

[0047] [Fig. 5] Figure 5 shows a schematic side view of the attachment means of Figure 4,

[0048] [Fig. 6] Figure 6 shows a schematic view of a support portion included in the attachment means according to the invention,

[0049] [Fig. 7] Figure 7 represents a schematic view of area A of figure 3,

[0050] [Fig. 8] Figure 8 shows a schematic perspective view of a mounting head included in the support device according to the invention, and

[0051] [Fig. 9] Figure 9 represents a schematic side view of the mounting head of Figure 8.

[0052] For clarity, identical or similar elements are identified by identical reference symbols across all figures. DETAILED DESCRIPTION

[0053] The present invention aims to improve optotype support devices used to perform vision examinations. More specifically, the invention provides a universal optotype support device, meaning one that can be used regardless of the dimensions and shape of the support bar associated with the refractor head. The optotype support device is therefore not limited to a single manufacturer or a single model of refractor head for performing near vision examinations.

[0054] Furthermore, the optotype support device according to the invention is easy to install on the support bar and to remove once the examination is complete.

[0055] Figure 2 shows a schematic perspective view of a set 10 for implementing a near vision examination of a subject. This set 10 includes a refractor head 12, a near vision test bar 15, and an optotype support device 100.

[0056] The refractor head 12 is not the core of the invention and is therefore not described in detail below. Essentially, it has two openings 13 opposite which the subject's eyes are positioned. Each of these openings 13 (or both) is, for example, fitted with a lens for performing a near vision examination. Furthermore, the refractor head 12 includes a through-slit 14 positioned between the two openings 13. This through-slit 14 is adapted to accommodate the subject's nose during the vision examination.

[0057] To perform the near vision test on the subject, the refractor head 12 is equipped with a near vision test bar 15. This test bar 15 is also referred to as the "holding bar" in this description. This test bar 15 is not the core of the invention and is therefore not described in detail hereafter. Essentially, it is, for example, attached to a front face 12A of the refractor head 12 and extends substantially perpendicularly to this front face 12A. Within the scope of the present invention, the cross-section of the test bar 15 can have any shape compatible with the refractor head 12. This cross-section can, in particular, It may be, but is not limited to, square, circular, or hexagonal in shape. Furthermore, to ensure the optotype can be positioned at a suitable distance from the subject's eyes, the test bar 15 may be equipped with indexing marks, each associated with a predefined distance from the subject's eyes.

[0058] The invention relates more particularly to the support device 100 of an optotype 102. Figure 3 represents more particularly the support device 100 according to the invention.

[0059] As can be seen in Figures 2 and 3, the support device 100 includes a hooking means 110 and a support part 130 of the optotype 102.

[0060] The attachment means 110 is particularly shown in Figures 4 and 5. It is designed to receive the near vision test bar 15. Advantageously, according to the invention, the attachment means 110 comprises a hook 115 and a base 112 from which the hook 115 extends. In this description, a hook means an element having a curved portion adapted to engage with a complementary element, so as to ensure reversible attachment, retention, or fixation of that complementary element.

[0061] The hook 115 is partially open here (thus forming an opening 113). In other words, it is a curved portion of material. Here, the hook 115 is shaped like an inverted C (with the opening on the left). From another view, it could, of course, be a standard C shape. This opening 113 is particularly advantageous because it allows the test bar 15 to be easily inserted and positioned in the hook 110. The opening also facilitates the removal of the support device 100 after the examination for storage. No disassembly or special effort is required for either installing or removing the support device 100.

[0062] To this end, the hook 115 comprises two free ends 115A and 115B facing each other and defining the opening 113. As can be seen in Figures 4, 5, and 7, the free ends 115A and 115B are rounded. For example, they have a radius greater than 2 millimeters (mm), for instance, on the order of 3 mm. The arms of the hook 115 have sufficient thickness to ensure its strength.

[0063] Preferably, a minimum distance between the two free ends 115A, 115B of the hook 115 is greater than 8 mm. Even more preferably, this minimum distance is greater than 10 mm. The minimum distance corresponds to the minimum gap observed between the two free ends 115A, 115B of the hook 115, this distance being determined perpendicular to each of these two free ends 115A, 115B (that is, in practice, perpendicular to the tangents to the rounded portion forming these free ends 115A, 115B). Using such values ​​for the minimum distance ensures easy insertion of the test bar 15 into the hook 115 of the attachment means 110. The practitioner does not need to force the test bar 15 into the hook 115.

[0064] The hook 115 also includes an internal surface 117 forming the inside of the curved portion of the hook 115. In other words, the internal surface 117 here forms the inside of the C-shape. This internal surface 117 is adapted to receive the test bar 15.

[0065] For this purpose, the internal surface 117 includes a support part 120 on which the test bar 15 is adapted to take support when the support device 100 is put in place for the examination of the subject's near vision.

[0066] Advantageously, according to the invention, the support portion 120 has a cross-section in the shape of a broken line and a particular form. This cross-section is more particularly shown in Figure 6. This broken line is formed here by the superposition of a hexagonal portion 125 and a square portion 122. More particularly, the broken line corresponds to a portion of a hexagonal shape intersected by a portion of a square shape.

[0067] As can be seen particularly in Figures 5 and 6, the hexagonal part 125 comprises a first vertex S1, a second vertex S2, a portion P1 of a first edge, a portion P2 of a second edge, and a third edge P3. As can be seen in Figures 5 and 6, the portion P1 of the first edge extends from the first vertex S1 but does not pass through the second vertex S2. The portion P2 of the second edge extends from the second vertex S2 but does not pass through the first vertex S1. Finally, the third edge connects the first vertex S1 and the second vertex S2. By construction and definition of a hexagon, the angle formed between portion P1 of the first edge and portion P2 of the second edge is 60 degrees (°).

[0068] In other words, the hexagonal part 125 corresponds to a truncated hexagon, with two vertices connected by one edge and two other edges each originating from one of the vertices.

[0069] The square segment 122 comprises a corner C1, a first segment K1 of side length , and a second segment K2 of side length . The first segment K1 of side length and the second segment K2 of side length extend from corner C1. By construction and definition of a square, the angle formed between the first segment K1 of side length and the second segment K2 of side length is 90°.

[0070] In other words, the square part 122 corresponds to a truncated square with a corner and two side parts extending from that corner.

[0071] Advantageously according to the invention, the third edge P3 of the hexagonal part 125 is intersected by the square part 122 in such a way that the square part 122 forms a notch in the hexagonal part 125. In other words, the third edge P3 also has the form of a broken line, with a hollow formed by the square part 122.

[0072] This particular shape for the support part 120 is particularly advantageous because it forms a suitable support imprint to cooperate with different shapes and dimensions of test bars, for example square or hexagonal.

[0073] Preferably, the square portion 122 is positioned centrally within the third edge P3. This means that the portions of the third edge P3 on either side of the square portion 122 have substantially the same dimensions. In this description, "substantially" means a difference between two elements of less than 5%.

[0074] As shown in Figures 4 and 5, on either side of the support part 120, the internal surface 117 of the hook 115 has a circular cross-section 121. This then allows it to also accommodate test bars of circular, elliptical or oblong shape.

[0075] In practice, portion P1 of the first edge of the hexagonal part 125 is connected to a part of the circular cross-section at a first endpoint E1. Portion P2 of the second edge of the hexagonal part 125 is connected to another part of the circular cross-section at a second endpoint E2.

[0076] This circular cross-section has a radius greater than 6 mm. Preferably, the radius of the circular cross-section is on the order of 7 mm.

[0077] As can be seen in Figure 5, a first tangent T1 to the circular cross-section is defined at the first endpoint E1 of the portion P1 of the first edge of the hexagonal part 125. Furthermore, a second tangent T2 to the circular cross-section is defined at the second endpoint E2 of the portion P2 of the second edge of the hexagonal part 125.

[0078] Here, the first tangent T1 and the second tangent T2 are orthogonal to each other. This results in a larger contact, and therefore support, surface between the test bar 15 and the internal surface 117 of the hook 115.

[0079] Preferably, the first tangent T1 is aligned with the first portion K1 of side of the square part 122. Also preferably, the second tangent T2 is aligned with the second portion K2 of side of the square part 122.

[0080] Thus, advantageously according to the invention, the internal surface 117 of the hook 115 is shaped, on the one hand via the support portion 120 and on the other hand via the portion comprising the circular cross-section 121, to accommodate test bars of very diverse shapes and dimensions. The particular shape of the internal surface 117 therefore makes it possible to obtain a universal attachment means (and thus an optotype support device), which can be used regardless of the test bar, and therefore regardless of the refractor head used (manufacturer, model, etc.).

[0081] As shown in Figures 4, 5 and 7, the hook 115 has, in a part opposite the support part 120, a through hole 118. In other words, the through hole 118 is formed in an upper part of the hook 115. This through hole 118 is adapted to accommodate a clamping means 150 adapted to clamp the test bar 15 against the internal surface 117 of the hook 115.

[0082] In practice, this clamping means 150 is, for example, a screw with a metric thread. In this case, the internal surface of the through hole 118 is tapped so as to cooperate with the screw.

[0083] Here, the clamping means 150 (for example, the screw) includes nylon. This prevents damage to the test bar 15 when it is tightened against the inner surface 117 of the hook 115.

[0084] Furthermore, the screw has a length greater than 4 mm, so as to ensure satisfactory tightening of the test bar 15 against the internal surface 117 of the hook 115.

[0085] In practice, hook 115 is made of a polymer material. It is formed, for example, by molding the polymer material or by additive manufacturing.

[0086] Alternatively, the hook 115 can be made of a metallic material, such as aluminum or steel. In this case, it is formed, for example, by machining.

[0087] Furthermore, the hook 115, for example, has a height greater than 10 millimeters (mm), preferably around 15 mm. This ensures the integrity of the hook and therefore the durability of the support device 100 during its successive uses and handling.

[0088] As shown in Figures 4, 5 and 7, the base 112 forms a support for the hook 115 of the attachment means 110. It includes in particular an end surface 112A, opposite the hook 115.

[0089] Here, base 112 has a parallelepiped shape with rounded corners. The end surface 112A is generally flat.

[0090] Alternatively, the base may have a parallelepiped (classic) shape or a cylindrical shape. Alternatively still, the base may have any shape provided it includes a generally flat end surface 112A (opposite the bracket 115).

[0091] In the case of a parallelepiped shape, the base 112, for example, has a side dimension between 10 and 20 mm, preferably around 16 mm. This ensures the compactness and lightness of the support device.

[0092] Thus, the total height of the 110 hanging device is greater than 20 mm. Preferably, it is between 20 and 35 mm. These dimensions ensure the structural integrity of the assembly while maintaining the lightness of the hanging device.

[0093] Preferably, the base 112 of the attachment means 110 comprises a polymer material. It is formed, for example, by molding the polymer material or by additive manufacturing.

[0094] Preferably, the base 112 and the hook 115 are formed from a single piece of polymer material, for example by molding or additive manufacturing. Alternatively, the base and the hook can be manufactured separately and bonded together.

[0095] Advantageously, the base 112 of the attachment means 110 comprises two magnets 140, positioned symmetrically with respect to each other. As can be seen in Figures 4 and 5, the magnets 140 are positioned close to the end surface 112A. In particular, they extend from the end surface 112A into the interior of the base 112.

[0096] In practice, these magnets 140 are partially encapsulated in the base 112 of the attachment means 110. The magnets 140 here exhibit a tensile force of less than 1.5 Newtons (N). Preferably, this tensile force is between 0.2 and 1.2 N.

[0097] The magnets 140 are presented here in the form of a cylinder with a diameter of approximately 3 mm and a height of approximately 2 mm. However, the invention is not limited to this shape and these dimensions for the magnets.

[0098] As can also be seen in Figures 4 and 5, the base 112 also includes a mounting hole 119. This mounting hole 119 extends from the end surface 112A. It is adapted to accommodate a mounting means 160 allowing the attachment means 110 and the support part 130 to be mounted together.

[0099] In practice, the magnets 140 are positioned symmetrically with respect to this mounting hole 119. The distance between a center of the mounting hole 119 and a center of a magnet 140 is greater than 3 mm. Preferably, this distance is on the order of 5 mm.

[0100] The support part 130 is adapted to accommodate and hold the optotype 102. For this purpose, as can be seen in particular in figure 3, the support part 130 includes a mounting head 135 and a receiving part 170 of the optotype 102.

[0101] The mounting head 135 is adapted to cooperate with the base 112 of the attachment means 110 to fix the support part 130 and the attachment means 110 together. This mounting head 135 is shown more particularly in Figure 8.

[0102] The mounting head 135, for example, has a height greater than 10 millimeters, preferably between 15 and 20 mm. This ensures the structural integrity and therefore the durability of the support device 100 during successive uses and handling.

[0103] As can be seen in particular in figures 7 and 8, the mounting head 135 comprises a cooperation part 133 and a mounting part 137.

[0104] The cooperating part 133 is adapted to cooperate with the base 112 of the attachment means 110. Here, the cooperating part 133 has a parallelepiped shape with rounded corners. The end surface 133A is generally flat.

[0105] Alternatively, the cooperation part may have a parallelepiped (classic) shape or a cylindrical shape. Alternatively still, the cooperation part may have any shape provided it includes a globally flat end surface 133A (free).

[0106] In the case of a parallelepiped shape, the cooperation part 133, for example, has a side dimension between 5 and 20 mm. Preferably, it is a square-based parallelepiped with sides of approximately 16 mm and a height of approximately 6 mm. This ensures the compactness and lightness of the support device 100.

[0107] Preferably here, the cooperation part 133 has a shape whose external contours are aligned with those of the base 112 of the attachment means 110 in order to improve the ergonomics of the entire support device 100.

[0108] Preferably, the cooperation part 133 of the mounting head 135 comprises a polymer material. It is formed, for example, by molding the polymer material or by additive manufacturing.

[0109] Advantageously, the cooperation portion 133 of the mounting head 135 includes two additional magnets 145, positioned symmetrically with respect to each other. These two additional magnets 145 are adapted to interact with the two magnets 140 of the base 112 of the mounting means 110. In other words, the additional magnets 145 have a polarity opposite to that of the magnets 140 housed in the base 112 of the mounting means 110.

[0110] This interaction allows the support part 130 to be held in a predefined position. Given the presence of two pairs of magnets 140 and 145, the support part 130 can be positioned and held in two predefined positions opposite each other (i.e., at an angle of 180° between them). In other words, it is possible to position, facing the subject, a first optotype located on the front of the support part 130, and a second optotype located on the back (i.e., behind the first optotype) of the support part 130. Finally, the cooperation between the two pairs of magnets allows for a bistable rotation of the support part 130. In this description, "bistable rotation" refers to a rotational movement allowing for two stable holding positions (here, through the cooperation of magnets 140 and the other magnets 145).

[0111] The cooperation between these two pairs of magnets is particularly advantageous because it allows the practitioner to easily change optotypes without having to disassemble the system or force it to reattach. Furthermore, this also reduces the bulk of the support device 100, which thus includes several optotypes that can be used to perform the subject's near vision examination.

[0112] In practice here, as can be seen in figures 8 and 9, the other magnets 145 are positioned close to the end surface 133A. In particular, they extend from the end surface 133A, inside the cooperation part 133.

[0113] In practice, these other magnets 145 are partially encapsulated in the cooperation part 133 of the mounting head 135. The other magnets 145 here exhibit a tensile force of less than 1.5 N. Preferably, this tensile force is between 0.2 and 1.2 N. Preferably here, the tensile force of the other magnets 145 is on the order of the tensile force of the magnets 140.

[0114] The other magnets 145 are presented here in the form of cylinders with a diameter of approximately 3 mm and a height of approximately 2 mm. However, the invention is not limited to this shape and these dimensions for the other magnets.

[0115] As also shown in Figures 8 and 9, the cooperation part 133 also includes a mounting hole 131. This mounting hole 131 extends from the end surface 133A. It is adapted to accommodate the mounting means 160, enabling the attachment means 110 and the support part 130 to be mounted together.

[0116] In practice, the other magnets 145 are positioned symmetrically with respect to this mounting hole 131. The distance between a center of the mounting hole 131 and a center of another magnet 145 is greater than 3 mm. Preferably, this distance is on the order of 5 mm.

[0117] In practice, the attachment means 110 and the support portion 130 are mounted to rotate relative to each other. To achieve this, the mounting means 160 is, on the one hand, tightly fitted within the base 112 of the attachment means 110 to ensure a secure fixing of the assembly. On the other hand, in the cooperation portion 133 of the mounting head 135 of the support portion 130, the mounting means 160 is mounted (at its end opposite the end mounted in the base 112) via a pivot joint, thus allowing the support portion 130 to rotate relative to the attachment means 110 (around a longitudinal axis of the mounting means 160).

[0118] As can be seen particularly in Figure 9, to ensure a sliding fit between the support portion 130 and the attachment means 110, the mounting hole 131 has a flared profile, being narrower at the end surface 133A. Specifically, this mounting hole 131 consists of a body 131A and a head 131B. The body 131A extends from the end surface 133A. The body 131A has a constant width here. The head 131B extends from this body 131A inside the support portion 130. This head 131B forms a flared portion allowing the mounting means 160 to form the pivot connection without leaving this mounting orifice 160.

[0119] The mounting means 160 is, for example, a screw, the head of which remains locked in the head 131 B of the mounting hole 160. The screw has a diameter greater than 2 mm. Preferably, this diameter is between 2 and 4 mm. This provides a mounting means robust enough to allow assembly and rotation between the support part and the attachment means without compromising the structural integrity of the two parts joined by this mounting means. Furthermore, these dimensions ensure sufficient space for positioning the other magnets.

[0120] As can be seen in figures 7 to 9, the mounting head 135 also includes the mounting part 137. This mounting part 137 is adapted to allow the mounting of the receiving part 170 of the optotype 102.

[0121] It includes in particular for this purpose an orifice 137A adapted to accommodate a means of securing 138 of the receiving part 170 of the optotype 102 to the mounting part 137.

[0122] In practice, this orifice 137A is shaped to accommodate this fastening means 138. Here, the fastening means is, for example, a screw 138 (Figure 7). This screw 138 comprises a head from which a threaded body extends. The orifice 137A is therefore shaped here to accommodate the threaded body, via an elongated tapped hole, and an inlet opening shaped to receive the head of the screw 138.

[0123] The mounting portion 137 is cylindrical in shape. The diameter of the cylindrical portion is, for example, greater than 6 mm, preferably around 10 mm. The orifice 137A extends from the lateral wall of this orifice 137A. Alternatively, the mounting portion can have any shape as long as it allows for the mounting of the receiving portion 170 of the optotype 102. In an alternative variant not shown, the mounting portion may, for example, have the same shape as the cooperation portion 133.

[0124] In practice, the cooperation part 133 and the mounting part 137 of the mounting head 135 are formed from a single piece of polymer material, for example by molding or by additive manufacturing.

[0125] The receiving portion 170 of the optotype 102 allows the optotype 102 to be held in the support device 10 according to the invention. Here, the receiving portion 170 is formed as a hollow body allowing the insertion and retention of the optotype 102 inside this hollow body. The receiving portion 170 is then provided with a window 102A allowing the subject to view the optotype 102 from outside the device during the near vision examination.

[0126] In practice, the element inserted into the hollow body forming the receiving part 170 is in the form of a disc divided into four parts. Each part forms an optotype that can be used during a near vision examination of the subject. It is then possible to change the optotype by rotating the disc.

[0127] In practice, the disc containing the optotypes is, for example, attached to the receiving part 170 by means of a rivet 172. This rivet 172 is positioned, for example, in the center of the disc and allows the disc to rotate (around this rivet) in order to change the visible optotype. The practitioner therefore does not need to perform any disassembly to change the optotype.

[0128] Furthermore, and advantageously in this case, window 102A is a through-hole. In other words, a through-hole is formed in the receiving section 170. In such a case, the disc inserted into the hollow body can have one or more optotypes on each of its two faces. For example, the disc can have four optotypes on one face (the front of the disc) and four more optotypes on the other face (the back). Moreover, by combining this with the two pairs of magnets described previously, the practitioner has a plurality of optotypes (for example, eight different optotypes) between which they can easily interchange.

[0129] Finally, advantageously, the support device 100 according to the invention provides a means for attaching the universal test bar, which has a support part with a support imprint adapted to cooperate with different shapes and dimensions of test bars, for example (and without limitation) square, hexagonal, circular, elliptical or oblong.

[0130] Furthermore, the cooperation between the two pairs of magnets allows for bistable rotation of the support part, thus enabling the practitioner to easily change optotypes without needing to disassemble the system or force it to reattach. Furthermore, this also helps to limit the bulk of the support device, which thus includes several optotypes that can be used to perform the subject's near vision examination.

Claims

DEMANDS

1. A support device (100) for an optotype (102) for examining a subject's near vision, the support device (100) comprising: - a mounting means (110) for receiving a near vision test bar (15) fixed to a refractor head (12), the mounting means (110) comprising a partially open hook (115) extending from a base (112), the hook (115) having an internal surface (117) provided with a bearing portion (120) on which the near vision test bar (15) is adapted to rest, the bearing portion (120) having a cross-section in the form of a broken line formed by a superposition of: a) a hexagonal portion (125) comprising: a1) a first vertex (S1) and a second vertex (S2), a2) at least one portion (P1) of a first edge extending from the first vertex (P1), the first edge not passing through the second vertex (S2), a3) at least one portion (P2) of a second edge extending from the second vertex (S2), the second edge not passing through the first vertex (S1), and a4) a third edge (P3) extending between the first vertex (S1) and the second vertex (S2), and b) a square part (122) comprising: b1) a corner (C1), b2) a first portion (K1) of the side extending from the corner (C1), and b3) a second portion (K2) of the side extending from the corner (C1), the third edge (P3) of the hexagonal part (125) being intersected by the square part (122) such that the square part (122) forms a notch in the hexagonal part (125), and - a support part (130) of the optotype (102) mounted on the base (112) of the attachment means (110).

2. Support device (100) according to claim 1, wherein the internal surface (117) of the hook (115) has, on either side of the support part (120), a circular cross-section (121).

3. Support device (100) according to claim 2, wherein the circular cross-section (121) has a radius greater than 6 millimeters.

4. Support device (100) according to claim 2 or 3, wherein, a first tangent (T1) to the circular cross-section (121) being defined at a first end (E1) of the support part (120) and a second tangent (T2) to the circular cross-section (121) being defined at a second end (E2) of the support part (120), the first tangent (T1) and the second tangent (T2) are orthogonal to each other. [Claims] Support device (100) according to any one of claims 1 to 4, in which the hook (115) has, in a portion opposite the support part (120), a through orifice (118) for receiving a clamping means (150) for the near vision test bar (15) against the internal surface (117) of the hook (115).

6. Support device (100) according to claim 5, in which the clamping means (150) comprises a screw having a metric thread, an internal surface of the through orifice (118) being tapped so as to cooperate with the screw.

7. Support device (100) according to claim 6, wherein the screw has a length greater than 4 millimeters. [Claims] Support device (100) according to any one of claims 1 to 7, wherein, on the one hand, the base (112) of the attachment means (110) comprises two magnets (140) positioned symmetrically with respect to each other, and on the other hand, the support part (130) comprises, at a free end positioned opposite the base (112) of the attachment means (110), two other magnets (145) positioned symmetrically with respect to each other and adapted to interact with the two magnets (140) of the base (112) of the attachment means (110) so as to maintain the support part (130) in a predefined position.

9. Support device (100) according to any one of claims 1 to 8, wherein the attachment means (110) and the support part (130) are mounted to rotate movable relative to each other.

10. Support device (100) according to any one of claims 1 to 9, wherein the hook (115) of the hooking means (110) comprises a polymer material.

11. Support device (100) according to claim 10, wherein the hook (115) of the hooking means (110) is manufactured by molding or additive manufacturing. [Claim ^] Support device (100) according to any one of claims 1 to 9, wherein the hook (115) of the hooking means (110) comprises a metallic material.

13. Support device (100) according to any one of claims 1 to 12, wherein the base (112) of the attachment means (110) comprises a polymer material.

14. Support device (100) according to any one of claims 1 to 13, wherein a minimum distance between the two free ends (115A, 115B) of the hook (115) is greater than 8 millimeters.

15. Assembly (10) for implementing a near vision examination of a subject comprising a refractor head (12), a near vision test bar (15) and a support device (100) for an optotype (102) according to any one of claims 1 to 14.

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