Binocular perspective vision device for long and short distances

Abstract

The present disclosure relates to a see-through binocular device (100) for long, medium and short distances, the see-through binocular device comprising two see-through optical modules (110a, 110b), each see-through optical module (110a, 110b) being configured to project an image (1a, 1b, 1c, 2a, 2b, 2c) of an object (1, 2) on a first plane without inversion, each see-through optical module (110a, 110b) comprising: i. An optical element (120) having a variable refractive index; ii. An optical projection system (130) configured for projecting an optical element (120) having a variable refractive index on a second plane (120 '); wherein: the input optical axes (113a, 113b) of the two see-through optical modules (110a, 110b) intersect on a plane corresponding to a close distance such that their fields of view (112a, 112b) completely or almost completely overlap for viewing an object located at a close distance. The disclosure also relates to systems and methods for determining sensory eye preponderance and / or for determining intensity of sensory eye preponderance.

Description

Technical Field

[0001] The present disclosure belongs to the field of visual optics. Background Art

[0002] Conventional binoculars are generally used only for distance vision - usually a distance of several meters - and are generally used to significantly magnify objects located at a distance. Typically, the magnification range of conventional binoculars is from 7x to 12x. The field of view (the area of ​​object space that can be seen through the optical system) also generally decreases in proportion to the magnification: the greater the magnification, the smaller the field of view. In fact, binoculars are not used to see objects at intermediate and near distances. In the art, the definitions of far, intermediate, and near distances are not uniform, but the best reference that will be used in this article is to consider: far distance, anything over 2m (up to infinity); intermediate distance, between 2m and 50cm; and near distance, between 25cm and 50cm. References to distances are taken from Buckhurst PJ et al., "Multifocal Intraocular Lens Differentiation Using Defocus Curves", Investigative Ophthalmology & Visual Science, June 2012, Vol. 53, No. 7.

[0003] Figure 1A A pair of binoculars 10 is depicted for use by a user, with the user's left and right eyes 11a, 11b schematically shown. The binoculars 10 are used to view an object 1 located at a distance; the object 1 in the example shown is the book of Don Quixote, which is located at a distance of approximately 40 centimeters from the user's position. The binoculars 10 are also used to view another object 2 located at a long distance; in this case, the object 2 is a windmill located approximately 100 meters from the user. The field of view produced by the left optical channel 10a of the binoculars is represented by striped area 12a, and the field of view produced by the right channel 10b of the binoculars is represented by striped area 12b.

[0004] Figure 1B The left part of the figure shows images 2a, 2b of an object 2 (i.e., a windmill) located at a distance that the user actually perceives through the left optical channel 10a and the right optical channel 10b of the binoculars, respectively. These images are enlarged portions of the object 2 with slightly different viewing angles (in the example shown, the user views the portion of the windmill blades). Since the fields of view 12a and 12b overlap at a long distance, the two images 2a, 2b viewed by the user with the binoculars overlap significantly, and at Figure 1B The image 2c generated by binocular vision is schematically shown on the right side of FIG.

[0005] Similar to Figure 1B way, Figure 1C The left part of shows the images 1a, 1b of the object 1 (i.e., Don Quixote's book) located at a close distance that the user actually perceives through the left optical channel 10a and the right optical channel 10b, respectively. However, the fields of view 12a and 12b do not overlap at medium distances, at least not at close distances, and the two images that the user sees with the binoculars do not overlap. As a result, when viewing Don Quixote's book through the binoculars, the user does not have actual binocular vision; the user actually perceives two separate non-overlapping images 1c of Don Quixote's book, as shown in FIG. Figure 1C This is schematically shown in the right image.

[0006] In fact, binoculars do not produce binocular vision when viewing objects at medium or close distances. At these distances - usually less than 2m, the fields of view produced by the left and right optical channels are separated; the result is very uncomfortable vision for the observer. Moreover, in addition to this separation effect, binoculars are usually unable to focus the image at medium and close distances. In fact, binoculars are not intended for viewing objects located at medium and close distances.

[0007] These undesirable effects become worse when the field of view of each of the left / right optical channels is reduced.

[0008] In addition, patent document EP3053512A1 is known, which discloses a miniature simultaneous vision simulator instrument that projects an adjustable lens in the pupil plane of the subject. If the adjustable lens is fast enough, the instrument disclosed in this patent document allows the use of time-division multiplexing technology to simulate a multifocal lens in a monocular manner. However, this instrument does not provide an effective solution for binocular vision at close, medium and long distances.

[0009] Therefore, there is a need for a binocular device that overcomes the shortcomings of existing solutions and allows a user to view objects located at close, medium and far distances. Summary of the invention

[0010] The present disclosure aims to address the shortcomings of prior art binocular devices by providing a see-through binocular device that produces a significant overlap area between the fields of view of the left and right channels at long, medium and near distances, which will provide stereoscopic vision for all distances.

[0011] In this article, the see-through binocular device may also be referred to as a binocular device.

[0012] One aspect of the present disclosure relates to a perspective binocular device for long, medium and short distances, the binocular device comprising:

[0013] Two perspective optical modules, each perspective optical module is configured to project an image without inversion on a first plane, each perspective optical module comprising:

[0014] i. Optical elements with variable optical power;

[0015] ii. an optical projection system configured to project an optical element having a variable refractive index onto a second plane;

[0016] in:

[0017] The output optical axis of each see-through optical module may have an equal deviation relative to the input optical axis, the deviation preferably being equal to zero (i.e., there is no deviation between the output axes of the two see-through optical modules) so as not to produce double vision in a user of the binocular device;

[0018] The input axes of the two perspective optical modules intersect on a plane corresponding to the near distance, so that their fields of view completely or almost completely overlap for viewing objects at the near distance.

[0019] The binocular device just defined provides each optical module with such a perspective field of view that is essentially completely overlapping for viewing objects at a close distance, and is separated and crossed for viewing objects at a long distance, wherein crossed means that the long-distance field of view of the right eye is on the left and the long-distance field of view of the left eye is on the right.

[0020] When using a binocular device, the first plane substantially overlaps with a plane containing the retina of the user's eye, and the second plane substantially overlaps with a pupil plane of the user's eye.

[0021] In any aspect or embodiment of the present disclosure, the optical element with a variable refractive index may be a light-tunable lens.

[0022] The optical channel may have a magnification ranging between 0.8 and 1.25, although a magnification of approximately 1 is a preferred choice.

[0023] In some embodiments, each optical element with a variable refractive index is configured to set a focus for near, intermediate, or long-distance viewing. Each optical element with a variable refractive index can operate independently of another optical element with a variable refractive index. This allows the binocular device of the present disclosure to simulate ophthalmic correction, which may be different between eyes.

[0024] Additionally or alternatively, optical elements with variable refractive power may be configured to produce multifocal simultaneous vision by time division multiplexing.

[0025] Thus, the binocular device of the present disclosure allows its user to experience different corrections in each eye, which is increasingly common in presbyopia correction:

[0026] Monovision: A different single focal correction in each eye, with one eye correcting for farsightedness (usually the dominant eye) and one eye correcting for nearsightedness (usually the non-dominant eye);

[0027] Modified monovision: one eye with a monofocal to correct hyperopia (usually the dominant eye) and the other eye with a multifocal to correct hyperopia (usually the non-dominant eye); or

[0028] Mix and Match: Each eye has a different multifocal correction.

[0029] In some embodiments, each projection system comprises a first lens group and a second lens group having equal focal length F, the first lens group and the second lens group are similar, preferably identical, but in opposite directions to each other, the first lens group is placed at a distance F relative to the principal plane of the optical element with variable refractive power, and the principal plane of the second lens group is placed at a distance 2F relative to the principal plane of the first lens group. Thus, a conjugate image of the optical element with variable refractive power having a uniform magnification is generated at a distance F behind the second lens group, and the projection system comprising the two lens groups acts as an afocal system, which means that the vergence of the light rays introduced by the optical element with variable refractive power is not modified.

[0030] In some embodiments, the projection system includes at least four mirrors for eliminating the inversion introduced by the first lens group and the second lens group. The image produced by the first lens group and the second lens group can also be inverted by providing a prism or a set of prisms in the projection system. A non-inverted image can also be generated using at least a third lens group.

[0031] In some embodiments, each projection system includes at least one free-form optical component block, which is used in combination with or without other lens groups and / or mirror groups and / or prism groups to generate a non-inverted image of a consistent magnification of an optical element with a variable refractive index.

[0032] In some embodiments, the see-through binocular device includes an additional offset lens placed next to the optical element with variable refractive power. In this way, the vergence of the light is additionally modified to move the dioptric range of the binocular device and place it in the desired position. In the context of the following disclosure, it should be understood to be included between 0 mm and 10 mm; the closer the better. The offset lens can be placed before or after the optical element with variable refractive power in the direction of the optical path.

[0033] In some embodiments, the distance between the first lens group and the second lens group can be varied and different from 2F. In this way, the vergence of the light is additionally modified to move the entire diopter range of the binocular device and place it in the desired position. This embodiment has the potential advantage of being more compact and does not require additional lenses to provide offset.

[0034] The see-through binocular device may include a mechanism for adjusting the interpupillary distance, which can horizontally move the see-through optical module without affecting the direction of the optical axis.

[0035] In any of the foregoing embodiments, the see-through binocular device may be configured such that a first distance between the second plane and a specific position (the position substantially overlapping the object to be observed) is equal to a second distance corresponding to the distance traveled by light from the specific position after being reflected in the reflector to reach the main plane of the optical element with a variable refractive index. In this way, when observed through the binocular device, the actual position of the observed object is consistent with the position perceived by the user. This can be achieved by providing at least one reflector upstream of the optical element with a variable refractive index in each see-through optical module.

[0036] Another aspect of the present disclosure relates to a method for projecting objects at long, medium and short distances without inversion, the method comprising:

[0037] projecting the object on a first plane without inversion using a first perspective optical module including an optical element with a variable refractive power, the projection comprising projecting the optical element with a variable refractive power on a second plane (PP);

[0038] projecting the object on the first plane without inversion using a second perspective optical module including an optical element with a variable refractive power, the projection including projecting the optical element with a variable refractive power on the second plane;

[0039] The method further includes:

[0040] The input optical axes of the two perspective optical modules are arranged to intersect at a plane corresponding to the near distance.

[0041] Furthermore, typically, the output optical axis of each perspective optical module is arranged to have an equal deviation relative to the input optical axis of the corresponding perspective optical module.

[0042] According to the above method, two fields of view are generated, which completely or almost completely overlap for viewing objects located at a close distance.

[0043] Additionally or alternatively, optical elements with variable refractive power may be configured to produce multifocal simultaneous vision by time division multiplexing.

[0044] Another aspect of the present disclosure relates to a see-through binocular system, which includes a see-through binocular device as described above; and an accessory for supporting one or more trial lenses, the accessory and the see-through binocular device including attachment means for attaching to each other in a secure manner so that the trial lenses are centered relative to the input optical axis of the see-through optical module.

[0045] The attachment means may comprise one or more magnets mounted on the accessory and on the see-through binocular device. The attachment means may alternatively comprise a plug and socket connector.

[0046] Another aspect of the present disclosure relates to a system for determining sensory eye dominance and / or for determining sensory eye dominance intensity, the system comprising:

[0047] A see-through binocular device as defined in any of the preceding aspects or embodiments, the binocular device being configured to:

[0048] performing a double test, wherein a refractive index value is introduced in a first optical module, preferably only in a first optical module, of the optical modules of the see-through binocular device to produce a blur in an image viewed by a user of the see-through binocular device through preferably only one optical module; and thereafter, a refractive index value is introduced in a second optical module, preferably only in a second optical module, of the optical modules to produce a blur in the same image viewed by the user through preferably only another optical module;

[0049] Repeat the previous double test N times;

[0050] a user interface for collecting, during each of the N times, a user's indication, the user's indication indicating a user's preference for the viewed image;

[0051] A processor is used to process the indications of the N users to determine the sensory eye dominance and / or determine the sensory eye dominance strength.

[0052] In the double test, one of the two optical channels is blurred, while the other is preferably sharp. Each double test can be performed randomly or pseudo-randomly, so that the optical module that is blurred first can be the optical module corresponding to the left eye or the right eye, but it is not obvious.

[0053] In some embodiments, N times is at least 10. In this way, the double test is repeated a reasonable number of times to balance the accuracy and reliability of the results, the comfort of the user, and the total duration of the test.

[0054] In certain embodiments, the introduced refractive index value is between 1.0 and 2.0 D, preferably a positive refractive index value.

[0055] Another aspect of the present disclosure relates to a method for determining sensory eye dominance and / or for determining sensory eye dominance intensity, the method comprising:

[0056] Conduct dual testing, including:

[0057] introducing a refractive index value in a first optical module of the see-through binocular device, preferably only in the first optical module, to produce blur in an image viewed by a user of the see-through binocular device through preferably only the first optical module, and thereafter,

[0058] introducing a refractive index value in a second optical module of the see-through device, preferably only in the second optical module, to produce blur in the same image viewed by the user through preferably only the second optical module;

[0059] Repeat the previous double test N times;

[0060] collecting a user's indication during each of the N times, the user's indication indicating the user's preference for the viewed image;

[0061] The indications of the N users are processed to determine sensory eye dominance and / or to determine sensory eye dominance strength.

[0062] In certain embodiments, a see-through binocular device for determining sensory eye dominance and / or for determining sensory eye dominance strength is as defined in any of the aforementioned aspects and / or embodiments.

[0063] The steps of the computer-implemented method for determining sensory eye dominance and / or for determining the strength of sensory eye dominance may be performed by a processor. The processor may be an integral part of the binocular device or part of a separate device (e.g., a laptop, a tablet, a mobile phone).

[0064] The different aspects and embodiments defined above can be combined with each other as long as they are compatible with each other.

[0065] Other advantages and features of the present disclosure will become apparent from the following detailed description and will be particularly pointed out in the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] In order to complete the description and to provide a better understanding of the present disclosure, a set of drawings is provided. The drawings form an integral part of the specification and illustrate one or more embodiments, which should not be interpreted as limiting the scope of the present disclosure, but are merely examples of how to implement the present disclosure. The drawings include the following figures:

[0067] Figure 1AA situation is depicted in which a user views two objects, one at a long distance and the other at a medium distance (or close distance), using a pair of conventional binoculars. Figure 1B and 1C Schematically represents the monocular image and binocular image viewed by a user at a long distance and a close distance respectively using a traditional binocular.

[0068] Figure 2A Shown with Figure 1A A similar situation, but using a see-through binocular device according to the invention which is optimized for viewing objects located at a medium distance. Figure 2B and 2C The monocular image and binocular image viewed by the user at a long distance and a close distance are schematically represented respectively.

[0069] Figure 3A Shown with Figure 1A In a similar manner, a see-through binocular device according to the invention is used, which is optimized for viewing objects located at a close distance. Figure 3B and 3C The monocular image and binocular image viewed by the user at a long distance and a close distance are schematically represented respectively.

[0070] Figure 4A A perspective view of an embodiment of a see-through optical module of a binocular device according to the present disclosure is shown. Figure 4B and 4C They are shown respectively Figure 4A Top and side views of the see-through optical module are shown.

[0071] Figure 5 A side view of another possible embodiment of a see-through optical module is shown.

[0072] Figure 6 A top view of a see-through binocular device according to another possible embodiment is shown.

[0073] Figure 7 A side view of another possible embodiment of a see-through optical module is shown.

[0074] Figure 8 A flow chart schematically illustrates the steps of a method for evaluating eye dominance strength according to the present disclosure.

[0075] Fig.9A A perspective view of a possible embodiment of an accessory for mounting one or more trial lenses on a binocular device according to the invention is shown. Fig. 9B A bottom view thereof is shown. DETAILED DESCRIPTION

[0076] The following description is not limiting but is merely for the purpose of illustrating the broad principles of the present invention. With reference to the accompanying drawings, embodiments of the apparatus and method of the present disclosure will be described by way of example.

[0077] According to the present disclosure, a see-through binocular device 100 is provided for near, medium and long distances, which further allows its user to experience different corrections in each eye. Figure 6 A possible embodiment of a see-through binocular device 100 for near, medium and long distances is schematically shown in FIG. 1 and will be explained in detail below.

[0078] First, in FIG. 2A to FIG. 2C and FIG. 3A to FIG. 3C FIG. 4 schematically shows the viewing result of the proposed perspective binocular device 100 .

[0079] Figure 2A Shown with Figure 1A A similar situation is that a user (whose left and right eyes 11a, 11b are shown) is presented with a scene including Don Quixote's book 1 located at a close distance (approximately 40 cm from the user) and a windmill 2 located at a far distance (approximately 100 meters from the user). The user is viewing the scene and the objects included therein using a perspective binocular device 100 according to the present disclosure. The binocular device 100 has a left optical channel 110a and a right optical channel 110b. The field of view generated by the left channel 110a of the binocular device 100 is represented by a stripe area 112a, and the field of view generated by the right channel 110b of the binocular device 100 is represented by a stripe area 112b; the left and right fields of view 112a and 112b completely overlap at a mid-distance, where the corresponding input optical axes of the left and right channels 113a and 113b intersect.

[0080] Figure 2B The left part of FIG. 1 shows images 2a, 2b of an object 2 (i.e., a windmill) located at a long distance that the user actually perceives through the left and right channels 110a, 110b, respectively, when the binocular device is configured to be optimal for medium distances. In this case, the images 2a, 2b include the windmill 2 with slightly different perspectives (magnification is 1x). Since the fields of view 112a and 112b overlap at long distances, the two images 2a, 2b viewed by the user with the binocular device 100 overlap significantly, and the image 2c generated by binocular vision overlaps at long distances. Figure 2B It is schematically shown on the right image.

[0081] Similar to Figure 2B way, Figure 2CThe left portion of shows the images 1a, 1b of the object 1 (i.e., Don Quixote's book) at a close distance that the user actually perceives through the left and right channels 110a, 110b, respectively, when the binocular device is configured to be optimal for medium distance. The fields of view 112a and 112b do overlap at close distances, and the two images 1a, 1b viewed by the user with the binocular device 100 also partially overlap. As a result, the user is also able to view Don Quixote's book 1 through the binocular device 100; the user actually perceives as Figure 2C The binocular vision image 1c is schematically represented on the right side of the image, rather than two separate images.

[0082] exist Figure 3A , the perspective binocular device 100 according to the present disclosure is configured to focus at a close distance where Don Quixote's book 2 is located. The left and right fields of view 112a and 112b completely overlap at a close distance where the respective input optical axes of the left and right channels 113a and 113b intersect. Figure 1B , Figure 1C , Figure 2B and Figure 2C , Figure 3B and Figure 3C The images actually viewed by the user at a long distance and a short distance are schematically represented respectively. Since the binocular device 100 is configured to be optimal for a short distance, the left and right images 11a, b are substantially completely overlapped to produce a binocular visual image 1c including Don Quixote's book. Moreover, the image 2c of the object (i.e., the windmill) located at a long distance is still correctly seen by the user because the left image 2a and the right image 2b partially overlap.

[0083] Therefore, the perspective binocular device 100 proposed herein satisfactorily solves the problems brought about by existing solutions (including the instrument disclosed in EP3053512A1).

[0084] As a first approach, one can consider the best possible case to be the balanced case, in which the fields of view overlap equally for near and far objects (and therefore completely overlap at a certain intermediate distance, such as Figure 2A ). However, several years of experimentation conducted in-house by the authors of this disclosure have led the authors to understand that the brain does not tolerate well the separation between the fields of view that this configuration produces for close objects, with the right field of view being further to the right and the left field of view being further to the left; this is disturbing and intolerable to many subjects. Conversely, it has been demonstrated that users can tolerate well a crossed field of view - that is, shifting the right field of view further to the left and the left field of view further to the right. Technically, this is a situation caused by the closer opening blocking the distant field of view. This crossing of the fields of view is like looking through a window.

[0085] FIG4 shows a possible embodiment of one of the two perspective optical modules 110a, 110b (also referred to as the left optical channel and the right optical channel in this example). The perspective optical module 110a / 110b includes an adjustable lens 120 and a projection system 130. The projection system 130 includes a first lens group and a second lens group 131, 132 and six mirrors 133, 134, 135, 136, 137, 138. The first lens group and the second lens group 131, 132 project the adjustable lens 120 on the pupil plane of the user's eyes 11a, 11b. Mirrors 135 and 138 invert the image vertically, while mirrors 136 and 137 invert the image horizontally. The combined effect of 131, 132, 135, 136, 137 and 138 produces a non-inverted (or upright) projection. The first two mirrors in the optical path (i.e., mirrors 133 and 134) are used to obtain the same input and output optical axes.

[0086] Figure 4A , Figure 4B and Figure 4C The paths followed by a set of five light rays in this embodiment of the optical module are schematically shown. The five light rays are a first light ray r along the optical axis, two light rays r contained in the YZ plane, v1 and r v2 and two rays r contained in the XZ plane h1 and r h2 It can be understood that the configuration of the five light rays at the entrance of the optical module remains at the entrance of the eyepiece lens without inversion; and has a consistent magnification at the same incident angle.

[0087] Figure 5 Another possible embodiment of a see-through optical module is shown, wherein an optical projection system 130 comprises first and second lens groups 131, 132 and a set of prisms 140, in this example Schmidt-Pechan prisms are used. The combined effect of the first and second lens groups 131, 132 and the prisms 140 produces a non-inverted (or erect) projection 120' of the adjustable lens 120 on the pupil plane PP of the eye 11a / 11b. The path of the input light beam is schematically indicated by an arrow.

[0088] Figure 6A top view of a perspective binocular device according to another possible embodiment is shown. The perspective binocular device 100 includes two identical perspective optical modules, including respective identical projection systems 130a, 130b. Each projection system includes three groups of lenses 131a / 131b, 132a / 132b and 139a / 139b, which project corresponding adjustable lenses 120a, 120b without inversion on the pupil plane of the user's corresponding eyes 11a, 11b.

[0089] Figure 6 represents a binocular device with two optical channels. Figure 5 The embodiment described in FIG. 4 only shows one optical channel. Figure 5 and Figure 6 By arranging two optical channels side by side, a binocular device can be obtained, similar to the reference Figure 6 A binocular device is described. One optical channel is for the left eye 11a and the second optical channel is for the right eye 11b. The two optical channels should be arranged so that the input axes of the two perspective optical modules intersect at a plane corresponding to a near distance; in this way, their fields of view completely or almost completely overlap to view objects located at a near distance.

[0090] Furthermore, the distance between the two optical channels should be set to be adjustable so that they are aligned with the user's eyes and thus match the user's interpupillary distance.

[0091] Figure 7 A side view of another possible embodiment of a see-through optical device is shown, which includes the following elements: an adjustable lens 120, three groups of lenses 131, 132, 139 and four mirrors M1, M2, M3, M4. These elements are arranged so that when a binocular device is used, a first distance DOTL between the pupil plane PP of the tunable lens 120 projection 120' and the observed object 1 is equal to a second distance DOP traveled by the light from the observed object 1 before reaching the tunable lens 120. This is achieved by inserting a mirror 131 upstream of the tunable lens 120, so that the tunable lens 120 is not in front of the eye 11a / 11b as was the case in the previous embodiments. Any of the previous embodiments can be modified to achieve this configuration.

[0092] Figure 8 The flowchart of the method for determining the sensory eye dominance strength of a person using the see-through binocular device 100 as described in any of the aforementioned embodiments is schematically shown.

[0093] According to the proposed method, the perspective binocular device 100 is configured to randomly present two test conditions to the user. The first condition - condition test A - implies that the user of the perspective binocular device 100 has no blur in the right eye and positive blur in the left eye, for example, 1.5 diopters. Under the second condition (condition test B), the left eye has no blur and the right eye has positive blur, for example, 1.5 diopters. The user of the binocular device 100 is provided with a means for indicating which of the first condition and the second condition is more preferred during this first two-condition test #1, and the preference indication is recorded as R1. Such means for inputting user preferences can be implemented by an application with a user interface; or the user's preferences can be collected through left / right buttons. This two-condition test is repeated a second time #2, during which the first condition and the second condition test are randomly presented to the user, and the user again provides his / her indicated preference, which is recorded as R2. This text is repeated N times to collect the user's preference each time in N times. After processing the N preference indications of the user of R1, R2...RN, the eye dominance strength of the user is evaluated.

[0094] For example, if the left eye was preferred to the unblurred condition in 8 out of 10 trials, the user would have a left eye dominance of 80% strength. The strength of eye dominance was calculated as NL / NT or NR / NT (depending on the eye), where NL is the number of times the subject preferred the left eye, NR is the number of times the subject preferred the right eye, and NT is the total number of trials.

[0095] Fig.9A A possible embodiment of an attachment 200a, 200b for mounting one or more trial lenses 300 on a binocular device 100 is shown. Fig.9A Two embodiments of the attachment are shown: one attachment 200a for mounting on the left channel of the binocular device 100, and another attachment 200b for mounting on the right channel of the binocular device 100. Each attachment 200a, 200b comprises an arm 210 having two ends, a first distal end having a holder 211 (similar to the holder of a phoropter) for supporting one or more trial lenses 300, and a second proximal end having a set of magnets 212 (three magnets 212 in the embodiment shown).

[0096] The one or more trial lenses 300 can be placed on each support to correct refractive errors (spherical and astigmatism) and for other purposes (e.g., introducing a trial lens to obtain a defocus curve). The set of magnets 212 allows each accessory 200a, 200b to be easily removably attached to the corresponding projector optical system 100, wherein a corresponding set of three magnets 150 has been arranged (see Fig. 9B ).

[0097] The set of magnets 212, 150 are positioned in such a way that the trial lens 300 is centered relative to the input optical axis of each optical channel once the accessory is mounted on the binocular device 100. In addition, when the interpupillary distance is adjusted in the binocular device 100, the set of magnets 150 is arranged to maintain the alignment of any trial lens 300 ultimately mounted on either accessory 200a, 200b.

[0098] The present disclosure is obviously not limited to the specific embodiments described herein, but also comprises any variation (e.g. regarding the choice of materials, dimensions, components, configuration, etc.) that may be considered by a person skilled in the art within the general scope of the disclosure defined in the claims.

[0099] In this document, the terms "include", "comprising" and their derivatives (for example, "including", "comprising", etc.) should not be understood as excluding the possibility that the described and defined content may include additional elements, steps, etc.

Claims

1. A perspective binocular device (100) for long distance, medium distance and short distance, the perspective binocular device (100) comprising: Two perspective optical modules (110a, 110b), each perspective optical module (110a, 110b) is configured to project an image (1a, 1b, 1c; 2a, 2b, 2c) of an object (1, 2) on a first plane without inversion, each perspective optical module (110a, 110b) comprising: i. an optical element (120) having a variable refractive index; and ii. an optical projection system (130), the optical projection system being configured to project the optical element (120) having a variable refractive index onto a second plane (120'); in: The input optical axes (113a, 113b) of the two perspective optical modules (110a, 110b) intersect on a plane corresponding to a close distance, so that their fields of view (112a, 112b) completely or almost completely overlap, for viewing objects at a close distance.

2. The see-through binocular device (100) according to claim 1, wherein: Each optical element (120) having a variable refractive power is configured to set a focus for near, medium or long distance viewing.

3. The see-through binocular device (100) according to any preceding claim, wherein: The optical element (120) with variable refractive power is configured to generate multi-focal simultaneous vision through time division multiplexing.

4. The see-through binocular device (100) according to any preceding claim, wherein: Each projection system (130) comprises at least a first group of lenses and a second group of lenses (131, 132) having equal focal lengths F, the first group of lenses and the second group of lenses (131, 132) being similar and preferably identical but being in opposite directions, the first group of lenses (131) being placed at a distance F relative to a principal plane of the optical element (120) having a variable refractive index, and the principal plane of the second group of lenses (132) being placed at a distance 2F relative to the principal plane of the first group of lenses (131).

5. The see-through binocular device (100) according to claim 4, wherein: Each projection system (130) further comprises at least four reflecting mirrors (133, 134, 135, 136, 137, 138) for eliminating the inversion introduced by the first lens group and the second lens group (131, 132).

6. The perspective binocular device (100) according to any one of claims 4-5, wherein: Each projection system (130) includes a prism or a group of prisms (140).

7. The see-through binocular device (100) according to any one of claims 1 to 6, further comprising a device for moving the diopter range of the binocular device by including an additional offset lens placed next to the optical element (120) with a variable refractive power, or by changing the distance between the first group of lenses and the second group of lenses (131, 132).

8. The perspective binocular device (100) according to any one of claims 1 to 7, wherein: Each projection system (130) can include at least one free-form optical component block.

9. The see-through binocular device (100) according to any preceding claim, wherein: Each perspective optical module (110a, 110b) comprises at least one reflector (M1), so that a first distance (DOTL) between the second plane (120') and a specific position (1) is equal to a second distance (DOP), the second distance corresponding to the distance traveled by light from the specific position (1) after being reflected in the reflector (M1) to reach the main plane of the optical element (120) with variable refractive index.

10. A see-through binocular device (100) according to any preceding claim, comprising a mechanism for adjusting the interpupillary distance.

11. A method for projecting objects at long, medium and short distances without inversion, the method comprising: Projecting an object (1, 2) on a first plane without inversion using a first perspective optical module (110a) comprising an optical element (120) with a variable refractive index, said projection comprising projecting said optical element (120) with a variable refractive index on a second plane (PP); Projecting the object (1, 2) on the first plane without inversion using a second perspective optical module (110b) including an optical element (120) with a variable refractive index, the projection including projecting the optical element (120) with a variable refractive index on the second plane; The method further comprises: The input optical axes (113a, 113b) of the two perspective optical modules (110a, 110b) are arranged to intersect at a plane corresponding to a close distance.

12. A perspective binocular system, comprising: The see-through binocular device (100) according to any one of claims 1 to 10; and an accessory (200a, 200b) for supporting one or more trial lenses (300), The attachment (200a, 200b) and the see-through binocular device (100) include attachment means (212, 150) for attaching to each other.

13. A system for determining sensory eye dominance and / or for determining the intensity of sensory eye dominance, the device / system comprising: The see-through binocular device (100) according to any one of claims 1 to 10, wherein the see-through binocular device is configured to: performing a dual test, wherein a refractive index value is introduced in a first one of the optical modules (110a, 110b) of the see-through binocular device (100) to produce blur in an image viewed by a user of the see-through binocular device (100) through one of the optical modules (110a, 110b), and alternatively, the refractive index value is introduced in a second one of the optical modules (110a, 110b) to produce blur in the same image viewed by the user through the other one of the optical modules (110a, 110b); Repeat the previous double test N times; a user interface for collecting, during each of the N times, a user's indication representing the user's preference for the viewed image; A processor is used to process the indications of the N users to determine the sensory eye dominance and / or determine the sensory eye dominance strength.

14. A method for determining sensory eye dominance and / or for determining the intensity of sensory eye dominance, the method comprising: Conduct dual testing, including: introducing a refractive index value in a first optical module of a see-through binocular device to produce blur in an image viewed by a user of the see-through binocular device through the first optical module, and Thereafter, introducing the refractive index value in a second optical module of the see-through device to produce blur in the same image viewed by the user through the second optical module; Repeat the previous double test N times; collecting a user's indication during each of the N times, the user's indication indicating the user's preference for the viewed image; The indications of the N users are processed to determine the sensory eye dominance and / or to determine the sensory eye dominance strength.

15. The system of claim 13 or the method of claim 14, wherein: Each double test is performed randomly or pseudo-randomly.

16. The method according to any one of claims 14-15, wherein: The see-through binocular device is the see-through binocular device according to any one of claims 1-10.

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