Eye data acquisition device and assembly for eye data acquisition

Abstract

Eye tracking device and eye tracking assembly. The invention relates to an eye tracking device (1) adapted to track the eye movement (5) of a user, comprising: - a support structure (7) adapted to be mounted on the head (3) of a user, - a video data acquisition means, comprising a camera (17) adapted to acquire video of said eyes, - an infrared wave emission means, adapted to emit infrared waves towards said eyes of said user, - a data transfer means adapted to transfer said acquired data to a data processing device comprising a pupil detection algorithm. According to the invention, the device (1) includes an optical accessory attachment interface (35) adapted to receive at least one external optical accessory.The invention also relates to an assembly for the acquisition of ocular data comprising such a device (1). Figure 3.

Description

Title of the invention: Device for acquiring ocular data and assembly for acquiring ocular data Technical field

[0001] The invention relates to the field of orthoptics. More specifically, the invention relates to the field of evaluating visual acuity, binocular vision and oculomotor disorders.

[0002] The invention relates more particularly to a device for acquiring ocular data and an assembly for acquiring ocular data comprising such a device. Prior art

[0003] Vision and visual motor disorders, more broadly referred to as neurovisual disorders, may occur in adults, for example, following neurological damage, or may be present in children, for example, following a lack of oxygen, extreme prematurity or neurological damage.

[0004] In children, these neurovisual disorders most often lead to learning disorders, which can impact in particular their ability to read and write, and can lead in particular to attention disorders.

[0005] It is therefore essential to be able to detect and treat these neurovisual disorders. For the purposes of diagnosis and management of these neurovisual disorders, the patient, child or adult, may be required to undergo a neurovisual assessment.

[0006] The neurovisual assessment includes an orthoptic assessment, consisting in particular of assessing visual acuity, binocular vision and oculomotor skills.

[0007] To do this, the practitioner, who may for example be an orthoptist, an ophthalmologist, a neurologist, has the patient undergo a series of tests, for near and / or far vision.

[0008] Among the tests used, we know the masking test (frequently referred to as the "cover test" in English), the aim of which is to reveal the presence of a manifest deviation or strabismus, called "tropia", or a latent deviation, called "phoria", in the patient, by detecting the presence or absence of this deviation of the axes of the eyes and, where appropriate, by quantifying the level of deviation.

[0009] To do this, the practitioner uses an eye patch to hide one of the patient's eyes. When the patient has a phoria, the value must be within a range of physiological reference values. When the patient has an orthophoria, the eye does not move either when the practitioner covers one of the eyes or when the practitioner removes the eye patch. On the other hand, when the patient has an exophoria, when the When the practitioner covers the eye, the eye under the eye patch looks outward, and when the practitioner removes the eye patch, it returns to its original position. When the patient has esophoria, the eye under the eye patch looks inward, and when the practitioner removes the eye patch, the eye returns to its original position. Similarly, when the patient has divergent or convergent tropia, when the practitioner covers one of the eyes with the eye patch, the eye that is not covered diverges or converges.

[0010] Whether in the context of a phoria or a tropia, the practitioner must very carefully observe the movement of the patient's eye when putting on the eye patch and removing the eye patch, in order to detect any movement of the patient's eye.

[0011] Also known is the ocular motility test, where the practitioner anatomically tests the patient's eye muscles. To do this, the practitioner moves a target in space to different locations to check the functioning of each eye muscle. When the practitioner detects a blockage in one eye, this means that paralysis of one or more eye muscles exists.

[0012] The "PPC" test (acronym for "Punctum Proximum of Convergence") is also known, which is used to determine the patient's convergence capabilities. The practitioner gradually approaches a fixation rod towards the patient's eyes and observes the movement of his eyes in order to determine whether the convergence of the eyes is satisfactory according to known criteria, in particular criteria of symmetry and simultaneity. The practitioner visually determines the break point, a point corresponding to the distance at which he observed that the patient's eyes had released and that they were no longer able to look at the fixation rod. By moving the fixation rod back, the overlap point is observed, a point corresponding to the distance at which the practitioner observed that the patient's eyes had fused and that he was able to look at the fixation rod.

[0013] Also known is the fusion amplitude test, or fusion vergence amplitude, which is a test for assessing motor fusion, in particular the extent to which a patient can maintain a single binocular vision in the presence of increasing vergence obtained either by a prism bar or by a diasporameter, or by anaglyph tests using glasses having a red lens on one side and green on the other, or with polarized tests using polarized lenses. This reflects the relative movement of the two eyes during the same task.

[0014] We also know the fixation test, which aims for the practitioner to determine the fixation capacity of a target. To do this, the practitioner asks the patient to fixate on a target without moving his eyes. The practitioner observes the patient and notes the time after which the patient has moved his eyes. The practitioner then compares the fixation time recorded with reference values, in particular defined according to the patient's age.

[0015] It may also be desired in the context of a neurovisual assessment to assess the quality of ocular pursuit and ocular saccade. With regard to the saccade, the practitioner uses two small targets, each target consisting, for example, of a small ball mounted at the end of a rod. The two targets are positioned in space and the practitioner asks the patient to look alternately at the two targets over several iterations. The practitioner observes the movement of the patient's eyes, based on his observation, he assesses the quality of the saccade. With regard to pursuit, the practitioner moves one of the targets in space and asks the patient not to take his eyes off it. The practitioner observes the movement of the patient's eyes during the movement to assess the quality of the pursuit.

[0016] It follows from the above that all the data from the aforementioned tests are acquired by the practitioner who administers these tests. The relevance of the data thus depends in particular on the practitioner, his experience, his dexterity and his level of attention during the measurements. The data from these tests are thus subjective.

[0017] In order to improve the reliability of the aforementioned tests, it is known to use an eye tracking device (referred to in English as "Eye Tracker"), which is a device designed to acquire ocular data by measuring the point of gaze and the movement of the eyes. This type of device advantageously makes it possible to refine the diagnosis.

[0018] Among the eye tracking device technologies used to date, we know in particular that known as corneal reflection, which consists of capturing the reflection of the light which is reflected on the cornea in order to determine the movement of the eyes.

[0019] This technology, however, has its limits when the subject wears glasses, the reflection of the lenses preventing the light from reflecting on the cornea.

[0020] However, it is essential to be able to equip the patient with his own glasses. Indeed, when a patient has accommodative strabismus, that is to say a strabismus which is only triggered when he is not wearing his glasses, the measurement of the phoria can only be done when he is wearing his glasses, at the risk of distorting the value of the measured phoria.

[0021] Another technology involves detecting the pupil of the eyes. To do this, an infrared beam is emitted into the eye and reflected on the retina, which returns the infrared beam. When it leaves the eye, the light captured corresponds to that reflected around the pupil.

[0022] Some prior art eye tracking devices, so-called "projected devices", comprise a screen onto which vision tests are projected. The eye tracking device comprises a means for acquiring the patient's eye movement, typically one or more cameras which are mounted on the screen or in the immediate vicinity of the screen. The practitioner positions the patient's head at a fixed distance pre- determined from the screen.

[0023] When this type of device operates using pupil detection technology by emitting infrared waves, this technology only works when the subject is exactly in the field in front of the infrared light source. Thus, if the subject leaves the field, pupil detection is no longer effective. In order to overcome this drawback, the practitioner blocks the patient's head in the appropriate position to ensure that the patient does not move his head during the entire test. This also ensures that the patient only moves his eyes and not his head, which could distort the measurements.

[0024] This type of system has the disadvantage of limiting the patient's freedom of movement.

[0025] Furthermore, while this technology can work when the subject wears glasses, it no longer works when the practitioner wishes to have the patient wear tinted lenses, such as anaglyph lenses, polarized lenses or liquid crystal lenses, the infrared light losing its power proportionally to the distance it travels.

[0026] Thus, in such a device, the pupil is not recognized when the patient wears tinted glasses.

[0027] However, it is essential for the practitioner to be able to carry out certain tests of the orthoptical assessment with such tinted lenses. Indeed, it may also be interesting for the practitioner to carry out measurements of phoria, tropia or fusion amplitudes with anaglyph or polarized lenses. Also, other tests such as the stereoscopic vision test, which reflects the patient's ability to see relief, require the use of anaglyph or polarized lenses.

[0028] Another type of device of the prior art consists of a device mounted on the subject's head. This is the case in particular of the device described in document WO 2011 / 124852 A1 which discloses an optical system such as a helmet worn by the subject.

[0029] This device is not very ergonomic or even incompatible with use with a subject who wears glasses or whose wearing of tinted glasses is desired by the practitioner to carry out certain tests.

[0030] This is all the more problematic since this type of device is also used in the field of research. However, currently, candidates who wear glasses are excluded from these research programs when the practitioner uses a mobile device of the type described in document WO 2011 / 124852 A1.

[0031] Another prior art on-board device consists of a virtual reality headset used as an eye tracking device.

[0032] However, this type of device can cause a problem of cyberkinetosis, which can manifest itself during exposure to a virtual environment.

[0033] Furthermore, this type of device is not compatible for use with children, and is therefore not compatible for use in the treatment of learning disabilities.

[0034] Furthermore, the subject must have good binocular vision to be able to see in relief in a virtual reality headset. Thus, this type of device is not compatible with patients suffering from strabismus. Statement of the invention

[0035] The present invention aims to overcome the aforementioned drawbacks, and to this end relates to an ocular data acquisition device adapted to follow the movement of a user's eyes, said ocular data acquisition device comprising: - a support structure adapted to be mounted on a user's head, - a means for acquiring video data, comprising at least one camera mounted on said support structure and adapted to acquire a video of at least one of the eyes of said user, - an infrared wave emission means, mounted on said support structure and adapted to emit infrared waves towards said at least one of the eyes of said user, - a data transfer means, mounted on said support structure and adapted to transfer said acquired data to a data processing device comprising a pupil detection algorithm, said ocular data acquisition device being remarkable in that it comprises an interface for fixing optical accessories mounted on said support structure and adapted to receive at least one external optical accessory.

[0036] Thus, by providing for mounting on the support structure of the ocular data acquisition device according to the invention both an infrared wave emission means and an interface for fixing optical accessories, the ergonomics of the on-board ocular data acquisition devices are improved compared to the prior art.

[0037] In this way, thanks to the present invention, the practitioner can now carry out eye examinations requiring the use of optical accessories, such as measurements of phoria, tropia, fusion amplitudes, stereoscopic vision tests, while using an on-board ocular data acquisition device.

[0038] According to optional characteristics of the ocular data acquisition device according to the invention: - said support structure comprises a front hoop and said fixing interface is arranged on said front hoop; - said fixing interface is arranged on said front hoop so as to define a prominence relative to said front hoop; - said fixing interface is magnetized; - said ocular data acquisition device comprises at least one support arm comprising a proximal portion extending from said support structure and a distal portion extending said proximal portion and supporting said at least one camera, said proximal portion extending in a plane substantially parallel to a longitudinal median plane of said ocular data acquisition device; - said at least one support arm comprises at least one point of curvature beyond which said distal portion extends said proximal portion and said distal portion extends from said proximal portion so as to approach said longitudinal median plane; - said support arm has an angle of curvature formed between said proximal portion and said distal portion of between approximately 10° and approximately 20°; - said proximal portion has a length of between approximately 6 cm and approximately 9 cm; - the length, measured along a substantially transverse axis between an inner face of a first end of said support arm and an inner face of said support structure coming into contact with the head of said user when said ocular data acquisition device is mounted on the head of said user, is between approximately 2 cm and approximately 3 cm.

[0039] The invention also relates to an assembly for acquiring ocular data comprising an ocular data acquisition device and an optical accessory, remarkable in that said ocular data acquisition device is according to the invention and in that said optical accessory is adapted to be fixed on the fixing interface of said ocular data acquisition device. Brief description of the drawings

[0040] Other characteristics, aims and advantages of the invention will appear on reading the detailed description which follows, for the understanding of which reference will be made to the appended drawings in which:

[0041] [Fig-1] shows an ocular data acquisition device according to the invention, mounted on a user's head and viewed in perspective from the left of the user's head.

[0042] [Fig.2] shows the ocular data acquisition device of the invention mounted on the user's head, viewed from the side from the left of the head.

[0043] [Fig.3] is a front view of the eye data acquisition device of the invention mounted on the user's head.

[0044] [Fig.4] is an enlargement of zone IV of [Fig.2].

[0045] [Fig.5] is a top view of the eye data acquisition device of the invention mounted on the user's head.

[0046] [Fig.6] is an enlargement of zone VI of [Fig.2].

[0047] [Fig.7] is a perspective view of a data acquisition assembly eyepieces mounted on the user's head, according to a first example of embodiment.

[0048] [Fig.8] is a perspective view of an assembly for acquiring ocular data mounted on the user's head, according to a second exemplary embodiment. Description of the embodiments

[0049] In the remainder of the description, elements having an identical structure or similar functions are designated by the same reference.

[0050] Reference is made to [Fig.l] showing a device 1 for acquiring ocular data according to the invention, mounted on the head 3 of a user and seen in perspective from the left of the head 3 of the user.

[0051] In the remainder of the description, the term “device 1” can be used to replace the expression “eye data acquisition device 1”.

[0052] By convention, longitudinal, vertical and transverse orientations will be adopted, without limitation, indicated by the direct trihedron (L, V, T) shown in the figures and designating the longitudinal, vertical and transverse axes of the device 1.

[0053] In the following, the terms “left”, “right”, “lower”, “upper”, “front”, “rear”, “inner”, “outer”, are understood in relation to the device 1 when it is mounted on the head of an individual.

[0054] The eye data acquisition device 1 is adapted to track the movement of the user's eyes 5 when it is in position on the user's head 3.

[0055] The device 1 comprises a support structure 7 adapted to be mounted on the head 3 of the user and to hold the device 1 in position on the head 3.

[0056] For this purpose, the support structure 7 can adopt different geometric shapes. In the embodiment illustrated in the figures, the support structure 7 is in the form of a rigid or partially rigid frame, comprising a front hoop, or front hoop 9, an upper hoop 11 and a rear hoop 13 (better visible in [Fig.2]).

[0057] In an alternative embodiment not shown in the figures, the support structure 7 does not include a rear hoop 13, the device 1 being held in position on the head 3 being ensured solely by the front hoop 9 and by the upper hoop 11.

[0058] According to one arrangement, the support structure 7 is designed to fit the head 3 of the user both when the user is an adult and when the user is a child.

[0059] For this purpose, the support structure 7 comprises a mechanical adjustment means 15, carried by the upper hoop 9, in order to allow adjustment of the device 1 in height, that is to say in the vertical direction of the device 1.

[0060] In an alternative embodiment not shown in the figures, a second mechanical adjustment means can be carried by the rear hoop 13 in order to allow adjustment of the device 1 in depth, that is to say in a longitudinal direction of the device 1.

[0061] The device 1 further comprises a video data acquisition means comprising, in the illustrated embodiment, two cameras 17 mounted on the support structure 7. Alternatively, a single camera 17 can be used to acquire a video of the user's eyes 5. The video data acquisition means further comprises a front camera 19, also called a scene camera or world camera, making it possible to visualize what the user of the device 1 sees during the acquisition of ocular data.

[0062] The cameras 17 are adapted to acquire a video of one of the two eyes 5 or of both eyes 5 of the user. For this purpose, the cameras 17 are positioned opposite the eyes 5 of the user.

[0063] In the exemplary embodiment illustrated in the figures, the cameras 17 are carried by two support arms 21 arranged to frame the user's face when the device 1 is in position on the user's head 3.

[0064] Each support arm 21 comprises a first end 23, mounted on the support structure 7, and a second end 25, free end, on which one of the cameras 17 is fixed.

[0065] Each camera 17 is mounted in an articulated manner on its corresponding support arm 21. Each camera 17 is rotatable about an axis of rotation 27 extending substantially vertically relative to the longitudinal direction of the support arm 21. By adjusting the inclination of the cameras 17, it is possible to adjust their axis of vision relative to the eyes 5 of the user. In order to allow good handling of the cameras 17, the device 1 may comprise a handling edge 29 at each free end of the support arms 21.

[0066] The device 1 further comprises an infrared wave emission means (not shown) mounted on the support structure 7 and adapted to emit infrared waves towards one of the eyes 5 or both eyes 5 of the user. The infrared wave emission means is for example positioned in the immediate vicinity of the cameras 17. The infrared wave emission means typically comprises an infrared diode.

[0067] The device 1 also comprises a data transfer means, comprising for example a means for wirelessly transmitting and receiving Wi-Fi waves (for “Wireless Fidelity” in English).

[0068] The device 1 also comprises a data transfer means such as a USB-C port (not shown), which allows data to be transferred wired to a data processing device.

[0069] The data transfer means is carried by the support structure 7 and is adapted to transfer the data acquired by the video data acquisition means to a data processing device.

[0070] The data processing device comprises software means that can, for example, be installed on an external digital terminal (not shown), for example a computer, fixed or portable, a smartphone or a tablet. The software means comprises a pupil detection algorithm, which can, for example, be trained by deep learning. The algorithm comprises, for example, a bank of pupil images that correspond to different types of individuals (children, adults, elderly people) and which are representative of different eye shapes and sizes.

[0071] The device 1 is powered with electrical energy by a rechargeable battery, for example a lithium-ion battery (not visible). The device further comprises a video acquisition card for each of the cameras 17, 19, as well as a microprocessor for each of the cameras 17, 19. The device 1 may also comprise an inertial station (not shown) capable of detecting the movements of the user's head 3, for example carried by a printed circuit mounted behind the front camera 19. The infrared means for wireless transmission and reception of Wi-Fi waves is for example integrated into the microprocessors.

[0072] The rechargeable battery, the video acquisition cards and the microprocessors are for example mounted in electronic boxes 31 connected to each other by the front arch 9 and intended to be positioned laterally relative to the user's skull when the device 1 is mounted on the user's head 3.

[0073] Furthermore, in one embodiment, the device 1 may comprise a microphone (not shown) integrated into the support structure 7 and connected to the digital terminal. For example, the microphone may be mounted in the support arm 21. According to an example of use of the device 1, the practitioner evaluates, using the microphone, the cognitive processing time, also called rapid naming time, between vision and speech. The practitioner then measures the time between the moment when the user, for example a child, sees a word during a reading test, and the moment when he transcribes it by speech.

[0074] The device 1 may also comprise, for example in addition to the mi crophone, a set of loudspeakers (not shown) that can be carried by microprocessors.

[0075] Reference is made to [Fig.2] showing the device 1 mounted on the user's head 3, in side view from the left of the head 3.

[0076] Each support arm 21 is mounted in an articulated manner on the support structure 7 at its first end 23. Each support arm 21 is rotatable about a substantially transverse axis of rotation 33, so as to allow adjustment of the inclination of the support arms 21 relative to the support structure 7.

[0077] Each of the support arms 21 is capable of being inclined under a substantially horizontal plane Pi, passing through the axis of rotation 33, that is to say a plane parallel to the plane (L, T) and. In order to optimize the shots of the cameras 17, the angle of inclination a is between approximately -10° and approximately -45° relative to the plane Pb

[0078] In order to further optimize the shots of the cameras 17, the length Li of each of the support arms 21 is between approximately 12 cm and approximately 17 cm, more particularly between approximately 14 cm and approximately 15 cm. The length Li corresponds to the branch length measured in a rectilinear manner between the axis of rotation 33 of the support arm 21 and the axis of rotation 27 of the corresponding camera 17.

[0079] Reference is made to [Fig.3] showing the device 1 mounted on the user's head 3, in front view.

[0080] As indicated above, the infrared wave emission means is mounted directly on the support structure 7, which allows the infrared waves to pass through any spectacle lenses worn by the user and / or any optical accessories, such as anaglyph, polarized or liquid crystal lenses, worn by the user at the request of the practitioner.

[0081] Thus, the power of the infrared wave which reaches the user's eyes 5 is advantageously such as to allow sufficient illumination of the user's eyes 5 to apply the pupil detection technology.

[0082] According to the invention, the device 1 comprises an interface 35 for fixing optical accessories mounted on the support structure 7 and adapted to receive various external optical accessories.

[0083] By way of non-limiting example, the external optical accessories that can be carried by the device 1 via the fixing interface 35 are anaglyph glasses, polarized glasses, liquid crystal glasses, an eye patch, corrective glasses, etc.

[0084] Thus, by providing for mounting on the support structure 7 of the device 1 both the infrared wave emission means and the optical accessory attachment interface 35, the ergonomics of the devices are improved compared to the prior art. on-board ocular data acquisition.

[0085] In this way, thanks to the present invention, the practitioner can now carry out eye examinations requiring the use of optical accessories, such as for example measurements of phoria, tropia, fusion amplitudes, stereoscopic vision tests, while using an on-board ocular data acquisition device.

[0086] In the embodiment illustrated in the figures, the fixing interface 35 is arranged on the front hoop 9, more particularly in the central part of the front hoop 9.

[0087] According to one embodiment of the invention, the fixing interface 35 is magnetized. This makes it possible to obtain self-centering of the optical accessory on the device 1, which makes it possible not to move the device 1 in place on the user's head 3 when the practitioner wishes to change optical accessories.

[0088] In this way, the risk of the device 1 becoming deregulated when changing optical accessories is reduced, a deregulation which could occur in the case of a mechanical fixing interface of the screw or clip type.

[0089] For example, the fixing interface 35 comprises two magnets 37 distributed on either side of the front camera 19.

[0090] According to an alternative embodiment not shown in the figures, the fixing interface 35 may comprise a single magnet, of the same size as one of the two magnets 37 illustrated in [Fig. 3], or of a larger size.

[0091] Reference is made to [Fig.4] showing an enlargement of zone IV of [Fig.2].

[0092] According to an exemplary embodiment of the device 1, the fixing interface 35 is arranged on the front hoop 9 so as to define a prominence relative to the front hoop 9. Thus, the fixing interface 35 projects relative to the front hoop 9.

[0093] The prominence of the attachment interface 35 is defined such that a front edge 39 of the attachment interface 35 is contained in a transverse plane P2 which is forward relative to a transverse plane P3 shown in dotted lines and containing the eyeglass lenses (not shown) of the user when the user wears eyeglasses.

[0094] In this way, the user can continue to wear his or her glasses despite the mounting of optical accessories on the device 1, which makes it possible to make the device 1 compatible for use with a subject who, for example, has a convenient strabismus.

[0095] Reference is made to [Fig.5] showing the device 1 mounted on the user's head 3, seen from above.

[0096] Each of the support arms 21 comprises a proximal portion 41, extending from the support structure 7, i.e. from the first end 23 of the support arm 21, and a distal portion 43, extending the proximal portion 41 and supporting the camera 17 at the second end 25 of the support arm 21.

[0097] In the exemplary embodiment of the device 1 illustrated in the figures, the proximal portion 41 of each of the support arms 21 extends in a plane P4 substantially parallel to a longitudinal median plane P5, that is to say a plane parallel to the plane (L, V) of the device 1.

[0098] This makes it possible to free up space in the user's temporal areas when the user wears the device 1 on his head, making it easier to put on or remove eyeglasses without having to pivot the support arms 21. In this way, the device 1 is prevented from becoming disturbed when putting on or removing eyeglasses.

[0099] In one embodiment of the device 1, each support arm 21 of the device 1 comprises at least one point of curvature 45, beyond which the distal portion 43 extends the proximal portion 41, and beyond which the distal portion 43 extends so as to approach the longitudinal median plane P5.

[0100] Advantageously, the points of curvature 45 are arranged so that the transverse plane P6 passing through the points of curvature 45 is substantially coincident with the transverse plane P3 containing the eyeglass lenses (not shown) of the user when the user wears eyeglasses. Thus, the plane P6 is located behind the transverse plane P2 which contains the front edge 39 of the fixing interface 35.

[0101] Tightening the support arms 21 toward the longitudinal median plane P5 beyond the points of curvature 45 allows the cameras 17 to be optimally positioned to acquire video of both eyes 5 of the user while allowing easy manipulation of the user's eyeglasses when the user is wearing eyeglasses.

[0102] For example, each of the support arms 21 has an angle of curvature [3 formed between the plane P4 containing the proximal portion 41 and the distal portion 43 of between approximately 10° and approximately 20°. In a particular embodiment of the device 1, the angle of curvature [3 is equal to approximately 15°.

[0103] Also, in one embodiment of the device 1, the proximal portion 41 has a length L2 of between approximately 6 cm and approximately 9 cm. In a particular embodiment of the device 1, the length L2 is equal to approximately 7.5 cm.

[0104] Reference is made to [Fig.6] showing an enlargement of zone VI of [Fig.2].

[0105] According to a provision of the invention, the length L3, corresponding to the length measured along the transverse axis of the device 1, between an inner face 47 of the first end 23 of the support arm 21 and an inner face 49 of the support structure 7 coming into contact with the head 3 of the user when the device 1 is mounted on the head 3 of the user, is between approximately 2 cm and approximately 3 cm.

[0106] In a particular embodiment of the device 1, the length L3 is equal to approximately 2.5 cm.

[0107] The length L3 thus defined makes it possible to create a clearance at the level of the temporal zones of the head 3, allowing the practitioner to have good maneuverability of the user's eyeglasses, if he wears eyeglasses, or optical accessories. Thanks to this arrangement, the risk of moving the support arms 21 when changing optical accessories or handling the eyeglasses is further avoided, which makes it possible to further reduce the risk of the device 1 becoming unregulated, which would impact the adjustment of the cameras 17.

[0108] We refer to [Fig.7] showing a first example of embodiment of an assembly 51 for the acquisition of ocular data mounted on the head 3 of the user.

[0109] The assembly 51 for acquiring ocular data comprises the device 1 and an optical accessory, consisting here of glasses 53 with anaglyph lenses or polarized lenses or liquid crystal lenses.

[0110] The optical accessory is adapted to be fixed on the fixing interface 35 of the device 1. For this purpose, the optical accessory comprises a cooperation interface 55, adapted to be received by the fixing interface 35 and here supporting the lenses 57. The cooperation interface 55 has a geometric shape complementary to that of the fixing interface 35. The cooperation interface 55 comprises a U-shaped cutout adapted to match the peripheral shape of the front arch 9 around the front camera 19.

[0111] When the glasses 53 with anaglyph or polarized lenses or liquid crystals are mounted on the device 1, the practitioner can carry out, using the device 1, all of the desired eye examinations.

[0112] When the practitioner wishes to carry out an eye examination requiring the use of another optical accessory, he removes the glasses 53 with anaglyph or polarized lenses or liquid crystals mounted on the device 1 and positions the appropriate optical accessory, for example an eye patch 59, as shown in [Fig.8] showing a second example of an assembly 61 for the acquisition of ocular data mounted on the head 3 of the user.

[0113] As seen previously, the user can wear his own prescription glasses in addition to the optical accessory, without the optical accessory interfering with the wearing of his own prescription glasses.

[0114] Also, the optical accessory is self-centered on the device 1 given the fact that the fixing interface 35 is magnetized and given the fact that the cooperation interface 55 comprises a U-shaped cutout adapted to match the peripheral shape of the front arch 9 around the front camera 19, which makes it easier to change optical accessories and reduces the risk of the device 1 becoming unbalanced.

[0115] As goes without saying, the present invention is not limited to the sole embodiments of this device for acquiring ocular data and of this assembly for acquiring ocular data, described above solely as illustrative examples, but on the contrary it embraces all the variants involving the technical equivalents of the means described as well as their combinations if these fall within the scope of the invention.

Claims

Claims

1. An eye data acquisition device (1) adapted to track the movement of a user's eyes (5), said eye data acquisition device (1) comprising: - a support structure (7) adapted to be mounted on a user's head (3), - video data acquisition means, comprising at least one camera (17) mounted on said support structure (7) and adapted to acquire a video of at least one of said user's eyes (5), - infrared wave emission means, mounted on said support structure (7) and adapted to emit infrared waves towards said at least one of said user's eyes (5), - data transfer means, mounted on said support structure (7) and adapted to transfer said acquired data to a data processing device comprising a pupil detection algorithm,said device (1) for acquiring ocular data being characterized in that it comprises an interface (35) for fixing optical accessories mounted on said support structure (7) and adapted to receive at least one external optical accessory.,

2. Device (1) for acquiring ocular data according to claim 1, characterized in that said support structure (7) comprises a front arch (9) and in that said fixing interface (35) is arranged on said front arch (9).

3. Device (1) for acquiring ocular data according to claim 2, characterized in that said fixing interface (35) is arranged on said front arch (9) so as to define a prominence relative to said front arch (9).

4. Device (1) for acquiring ocular data according to one of claims 2 or 3, characterized in that said fixing interface (35) is magnetized.

5. Device (1) for acquiring ocular data according to any one of claims 1 to 4, characterized in that it comprises at least one support arm (21) comprising a proximal portion (41) extending from said support structure (7) and a distal portion (43) extending said proximal portion (41) and supporting said at least one camera (17), said proximal portion (41) extending in a plane (P4) substantially parallel to a longitudinal median plane (P5) of said ocular data acquisition device (1).

6. Device (1) for acquiring ocular data according to claim 5, characterized in that said at least one support arm (21) comprises at least one point of curvature (45) beyond which said distal portion (43) extends said proximal portion (41) and in that said distal portion (43) extends from said proximal portion (41) so as to approach said longitudinal median plane (P5).

7. Device (1) for acquiring ocular data according to claim 6, characterized in that said support arm (21) has an angle of curvature (|3) formed between said proximal portion (41) and said distal portion (43) of between approximately 10° and approximately 20°.

8. Device (1) for acquiring ocular data according to any one of claims 5 to 7, characterized in that said proximal portion (41) has a length (L2) of between approximately 6 cm and approximately 9 cm.

9. Device (1) for acquiring ocular data according to any one of claims 5 to 8, characterized in that the length (L3), measured along a substantially transverse axis between an inner face (47) of a first end (23) of said support arm (21) and an inner face (49) of said support structure (7) coming into contact with the head (3) of said user when said device (1) for acquiring ocular data is mounted on the head (3) of said user, is between approximately 2 cm and approximately 3 cm.

10. Assembly (51, 61) for acquiring ocular data comprising a device (1) for acquiring ocular data and an optical accessory (53, 59), characterized in that said device (1) for acquiring ocular data is according to any one of claims 1 to 9 and in that said optical accessory (53, 59) is adapted to be fixed on the fixing interface (35) of said device (1) for acquiring ocular data.

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