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 in the direction of said user's eyes, - 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: Ocular data acquisition device and assembly for ocular data acquisition technical field

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

[0002] The invention relates more particularly to an eye data acquisition device and an assembly for eye data acquisition comprising such a device. Previous technique

[0003] Visual and motor disorders, more broadly called neurovisual disorders, can occur in adults, for example following neurological damage, or can 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 difficulties, 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, performs a series of tests on the patient, in 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 purpose 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, if applicable, by quantifying the level of deviation.

[0009] To do this, the practitioner uses an eye patch to cover 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 orthophoria, the eye does not move either when the practitioner covers one of the eyes or when the practitioner removes the eye patch. Conversely, when the patient has exophoria, when The practitioner covers the eye; the eye under the patch looks outward, and when the patch is removed, it returns to its original position. When the patient presents with esophoria, the eye under the patch looks inward, and when the practitioner removes the patch, it returns to its original position. Similarly, when the patient presents with divergent or convergent tropia, when the practitioner covers one eye with the patch, the uncovered eye 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 at the time of putting on the eye patch and removing the eye patch, in order to detect any movement of the patient's eye.

[0011] The ocular motility test is also known, in which 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 function 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 de Convergence") is also known and is used to determine a patient's convergence abilities. The practitioner gradually moves a fixation rod towards the patient's eyes and observes eye movement to determine whether eye convergence is satisfactory according to known criteria, including symmetry and simultaneity. The practitioner visually determines the break point, which corresponds to the distance at which the patient's eyes have drifted away and can no longer focus on the fixation rod. By moving the fixation rod back, the recapture point is observed, which corresponds to the distance at which the practitioner has observed the patient's eyes have merged and they can once again focus on the fixation rod.

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

[0014] The fixation test is also known, which aims to determine the practitioner's ability to fixate on a target. To do this, the practitioner asks the patient to fixate on a target without moving their eyes. The practitioner observes the patient and notes the time after which the patient moved their eyes. The practitioner then compares the recorded fixation time with reference values, notably those defined according to the patient's age.

[0015] It may also be desirable, as part of a neurovisual assessment, to evaluate the quality of eye pursuit and saccades. For saccades, the practitioner uses two small targets, each target being, for example, a small ball mounted on 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 patient's eye movements and, based on this observation, assesses the quality of the saccade. For pursuit, the practitioner moves one of the targets in space and asks the patient to keep their eyes on it. The practitioner observes the patient's eye movements 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 administering these tests. The relevance of the data therefore depends in particular on the practitioner, their experience, dexterity, and level of attention during the measurements. The data from these tests are thus subjective.

[0017] To improve the reliability of the aforementioned tests, it is known to use an eye-tracking device (referred to in English as an "eye tracker"), which is a device designed to acquire ocular data by measuring the gaze point and eye movement. This type of device advantageously allows for a more precise diagnosis.

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

[0019] However, this technology has its limitations when the subject wears glasses, as the reflection from the lenses prevents light from being reflected onto the cornea.

[0020] However, it is essential to be able to equip the patient with their own eyeglasses. Indeed, when a patient presents with accommodative strabismus, that is to say, strabismus that only occurs when they are not wearing their glasses, the phoria measurement can only be taken when they are wearing their glasses, at the risk of distorting the measured phoria value.

[0021] Another technology involves detecting the pupil of the eye. To do this, an infrared beam is emitted into the eye and reflected off the retina, which reflects the infrared beam. The light captured at the eye's exit corresponds to that reflected around the pupil.

[0022] Some prior art eye-tracking devices, known as "projected devices," include a screen onto which vision tests are projected. The eye-tracking device includes a means for acquiring the patient's eye movements, typically one or more cameras mounted on or near the screen. immediate view of the screen. The practitioner positions the patient's head at a predetermined fixed distance from the screen.

[0023] When this type of device operates using pupil detection technology by infrared wave emission, this technology only works when the subject is positioned directly in front of the infrared light source. Therefore, if the subject moves out of the field of view, pupil detection is no longer effective. To overcome this limitation, the practitioner holds the patient's head in the correct position to ensure that the patient does not move their head during the entire test. This also ensures that the patient only moves their eyes and not their head, which could distort the measurements.

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

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

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

[0027] However, it is essential for the practitioner to be able to perform certain tests in the orthoptic assessment with such tinted lenses. Indeed, it can also be useful for the practitioner to perform phoria, tropia, or fusion amplitude measurements with anaglyph or polarized lenses. Furthermore, other tests, such as the stereoscopic vision test, which assesses the patient's ability to perceive depth, require the use of anaglyph or polarized lenses.

[0028] Another type of prior art device consists of a device worn on the subject's head. This is notably the case for 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 and may even be incompatible with use by a subject who wears glasses or whose wearing of tinted lenses 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 research. Currently, however, candidates who wear glasses are excluded from these research programs when the practitioner uses a portable device of the type described in document WO 2011 / 124852 AL

[0031] Another prior art embedded 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 with use with children, and is therefore not compatible with 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 suitable for patients with strabismus. Description of the invention

[0035] The present invention aims to overcome the aforementioned drawbacks, and to this end relates to an eye-tracking data acquisition device adapted to follow the eye movements of a user, said eye-tracking 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 video from at least one of said user's eyes, - a means for emitting infrared waves, mounted on said support structure and adapted to emit infrared waves in the direction of at least one of the user's eyes, - 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 notable in that it includes an optical accessory attachment interface 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 eye data acquisition device according to the invention both a means for emitting infrared waves and an interface for attaching optical accessories, the ergonomics of embedded eye data acquisition devices are improved compared to the prior art.

[0037] Thus, thanks to the present invention, the practitioner can now perform eye examinations requiring the use of optical accessories, such as measurements of phoria, tropia, fusion amplitudes, stereoscopic vision tests, while using an on-board device for acquiring eye data.

[0038] According to optional features of the eye data acquisition device according to the invention: - said support structure includes a front hoop and said fixing interface is arranged on said front hoop; - said fixing interface is arranged on said front headband so as to define a prominence relative to said front headband; - said fixing interface is magnetic; - said eye data acquisition device includes at least one support arm having a proximal portion extending from said support structure and a distal portion extending from 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 eye data acquisition device; - said at least one support arm has 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 a curvature angle formed between said proximal portion and said distal portion of between approximately 10° and approximately 20°; - said proximal portion has a length 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 eye 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 the acquisition of eye data comprising an eye data acquisition device and an optical accessory, notable in that said eye 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 eye data acquisition device. Brief description of the drawings

[0040] Other features, purposes and advantages of the invention will become apparent from the following detailed description, for the understanding of which reference should be made to the accompanying drawings in which:

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

[0042] [Fig.2] shows the eye-tracking data acquisition device of the invention mounted on the user's head, in side view from the left of the head.

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

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

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

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

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

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

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

[0050] Reference is made to [Fig.1] showing an eye data acquisition device 1 according to the invention, mounted on the head 3 of a user and seen in perspective from the left of the user's head 3.

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

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

[0053] In what follows, the terms "left", "right", "lower", "upper", "front", "rear", "inside", "outside", are understood in relation to the device 1 when 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 includes a support structure 7 adapted to be mounted on the user's head 3 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 arch, or front arch 9, an upper arch 11 and a rear arch 13 (better seen 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 retention in position of the device 1 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 adapt to the head 3 of the user whether the user is an adult or a child.

[0059] For this purpose, the support structure 7 includes a mechanical adjustment means 15, carried by the upper hoop 9, in order to allow adjustment of the device 1 in height, i.e. 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, i.e. along a longitudinal direction of the device 1.

[0061] The device 1 further includes 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 video of the user's eyes 5. The video data acquisition means further includes a front camera 19, also called a scene camera or world camera, for viewing what the user of the device 1 sees during the acquisition of eye data.

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

[0063] In the 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 includes 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 hinged 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 tilt of the cameras 17, their line of sight can be adjusted relative to the user's eyes 5. To facilitate handling of the cameras 17, the device 1 may include 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 waves infrared waves are directed towards one or both eyes of the user. The infrared wave emission means is, for example, positioned in the immediate vicinity of the cameras. The infrared wave emission means typically includes an infrared diode.

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

[0068] Device 1 also includes a means of data transfer such as a USB-C port (not shown), which allows data to be transferred via a wired connection 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 includes a software component that can, for example, be installed on an external digital terminal (not shown), such as a desktop or laptop computer, a smartphone, or a tablet. The software component includes a pupil detection algorithm, which can, for example, be trained by deep learning. The algorithm includes, in particular, a database of pupil images corresponding to different types of individuals (children, adults, elderly people) and representative of different eye shapes and sizes.

[0071] Device 1 is powered by a rechargeable battery, for example a lithium-ion battery (not shown). The device further includes a video acquisition card for each of the cameras 17, 19, as well as a microprocessor for each of the cameras 17, 19. Device 1 may also include an inertial station (not shown) capable of detecting the movements of the user's head 3, for example carried by a printed circuit board 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, video acquisition cards and microprocessors are for example mounted in electronic boxes 31 connected to each other by the front band 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 include 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 one example of using the device 1, the practitioner uses the microphone to assess the cognitive processing time, also called rapid naming, between the vision and speech. The practitioner then measures the time between the moment the user, for example a child, sees a word during a reading test, and the moment he transcribes it verbally.

[0074] Device 1 may also include, for example in addition to the microphone, a set of loudspeakers (not shown) which may be carried by the 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 articulated on the support structure 7 at its first end 23. Each support arm 21 is movable in rotation 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). In order to optimize the images captured by the cameras 17, the angle of inclination a is between approximately -10° and approximately -45° relative to the plane Pp

[0078] In order to further optimize the image capture 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 arm length measured in a straight line 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 glasses 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 optical accessory mounting interface 35 mounted on the support structure 7 and adapted to receive various external optical accessories.

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

[0084] Thus, by planning to mount on the support structure 7 of the device 1 both the means for emitting infrared waves and the interface for attaching optical accessories 35, the ergonomics of the embedded devices for acquiring eye data are improved compared to the prior art.

[0085] In this way, thanks to the present invention, the practitioner can now perform eye examinations requiring the use of optical accessories, such as phoria, tropia, fusion amplitude measurements, stereoscopic vision tests, while using an on-board eye 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 fastening interface 35 is magnetic. This allows the optical accessory to self-center on the device 1, thus preventing the device 1 from moving while in place on the user's head 3 when the practitioner wishes to change optical accessories.

[0088] In this way, the risk of misalignment of device 1 during the change of optical accessories is reduced, a misalignment which could occur in the case of a mechanical fixing interface of the screw or clip type.

[0089] For example, the mounting interface 35 has 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 include 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 one embodiment of device 1, the fastening 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 protrudes relative to the front hoop 9.

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

[0094] In this way, the user can continue to wear their prescription glasses despite the mounting of optical accessories on the device 1, which makes it compatible device 1 for use with a subject who presents, for example, accommodative strabismus.

[0095] Reference is made to [Fig.5] showing the device 1 mounted on the user's head 3, in top view.

[0096] Each of the support arms 21 has 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 level of the second end 25 of the support arm 21.

[0097] In the example embodiment of 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 device 1.

[0098] This allows space to be freed up at the temporal areas of the user when the user wears the device 1 on his head, making it easier to put on or take off eyeglasses without having to rotate the support arms 21. In this way, a misalignment of the device 1 is avoided when putting on or taking off eyeglasses.

[0099] In an embodiment of the device 1, each support arm 21 of the device 1 has 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 substantially coincides with the transverse plane P3 containing the user's eyeglass lenses (not shown) when the user is wearing eyeglasses. Thus, plane P6 lies behind the transverse plane P2, which contains the front edge 39 of the attachment interface 35.

[0101] The tightening of the support arms 21 towards 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 handling of the user's eyeglasses when the user wears eyeglasses.

[0102] For example, each of the support arms 21 has a curvature angle [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 curvature angle [3 is equal to approximately 15°.

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

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

[0105] According to one arrangement of the invention, the length L3, corresponding to the length measured along the transverse axis of 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 user's head 3 when device 1 is mounted on the user's head 3, is between approximately 2 cm and approximately 3 cm.

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

[0107] The length L3 thus defined creates clearance at the temporal areas of the head 3, allowing the practitioner good maneuverability of the user's eyeglasses, if they wear them, or optical accessories. This arrangement further reduces the risk of movement of the support arms 21 when changing optical accessories or handling eyeglasses, thereby further minimizing the risk of misalignment of the device 1, which would affect the adjustment of the cameras 17.

[0108] Reference is made to [Fig.7] showing a first example of the realization of an assembly 51 for the acquisition of eye data mounted on the user's head 3.

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

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

[0111] When the glasses 53 with anaglyph or polarized or liquid crystal lenses are mounted on the device 1, the practitioner can perform, with the help of the device 1, all the desired eye examinations.

[0112] When the practitioner wishes to perform an eye examination requiring the use of another optical accessory, he removes the anaglyph or polarized or liquid crystal glasses 53 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 the realization of a set 61 for the acquisition of eye data mounted on the user's head 3.

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

[0114] Also, the optical accessory is self-centered on the device 1 given that the fixing interface 35 is magnetic and given that the cooperation interface 55 has a U-shaped cut adapted to fit the peripheral shape of the front arch 9 around the front camera 19, which makes it easier to change optical accessories and to reduce the risk of misalignment of the device 1.

[0115] As will be understood, the present invention is not limited to the embodiments of this eye data acquisition device and of this assembly for eye data acquisition, described above only by way of illustrative examples, but on the contrary it encompasses all variants involving the technical equivalents of the means described as well as their combinations if these fall within the scope of the invention.

Claims

Demands

1. An eye-tracking data acquisition device (1) adapted to track the eye movement (5) of a user, said eye-tracking data acquisition device (1) comprising: - a support structure (7) adapted to be mounted on the head (3) of a user, - a video data acquisition means, comprising at least one camera (17) mounted on said support structure (7) and adapted to acquire video of at least one of the user's eyes (5), - an infrared wave emission means, mounted on said support structure (7) and adapted to emit infrared waves in the direction of said at least one of the user's eyes (5), - a 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,- an optical accessory mounting interface (35) mounted on said support structure (7) and adapted to receive at least one external optical accessory, said eye data acquisition device (1) being characterized in that said support structure (7) comprises a front band (9) and in that said mounting interface (35) is arranged on said front band (9).

2. Eye data acquisition device (1) according to claim 1, characterized in that said attachment interface (35) is arranged on said frontal hoop (9) so as to define a prominence relative to said frontal hoop (9).

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

4. An eye-sensing data acquisition device (1) according to any one of claims 1 to 3, characterized in that it comprises at least one support arm (21) having a proximal portion (41) extending from said support structure (7) and a distal portion (43) extending from 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 plane longitudinal median (P5) of said eye data acquisition device (1).

5. Eye data acquisition device (1) according to claim 4, characterized in that said at least one support arm (21) has 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).

6. Eye data acquisition device (1) according to claim 5, characterized in that said support arm (21) has a curvature angle (|3) formed between said proximal portion (41) and said distal portion (43) of between approximately 10° and approximately 20°.

7. Eye data acquisition device (1) according to any one of claims 4 to 6, characterized in that said proximal portion (41) has a length (L2) between about 6 cm and about 9 cm.

8. An eye-tracking data acquisition device (1) according to any one of claims 4 to 7, 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 eye-tracking data acquisition device (1) is mounted on the head (3) of said user, is between approximately 2 cm and approximately 3

9. cm. Assembly (51, 61) for the acquisition of eye data comprising an eye data acquisition device (1) and an optical accessory (53, 59), characterized in that said eye data acquisition device (1) is according to any one of claims 1 to 8 and in that said optical accessory (53, 59) is adapted to be fixed on the fixing interface (35) of said eye data acquisition device (1).

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