Visual training device and visual training method

Abstract

A visual training apparatus according to an embodiment of the present invention comprises: a skew angle determination unit that determines a skew angle and a skew direction of a user; a strabismus correction value determination unit that determines at least one or more correction prism diopters and correction directions based on the skew angle and the skew direction; a visual training unit that determines at least one of the corrective prism diopters as a training range and guides the user's eyes to move in a skew direction and a corrective direction; and a refraction angle adjustment unit that changes a refraction angle of light entering the user's eyes according to at least one or more correction prism diopters included in the skew angle or the training range. By means of visual training, weak ocular muscles, which are the root cause of strabismus, can be enhanced.

Description

Technical Field

[0001] The present invention relates to a vision training device and a vision training method. More specifically, the present invention relates to a vision training device and a vision training method for patients with strabismus or latent strabismus. Background Art

[0002] Strabismus refers to any misalignment of the eyes. Strabismus refers to a condition in which one eye focuses on an object while the other eye does not focus on the object when looking at an object. Latent strabismus, also known as hidden strabismus, refers to a condition in which, under normal circumstances, the two eyes are normally aligned, but strabismus occurs when one eye is occluded. Hereinafter, "strabismus" will be used as a term representing latent strabismus (hidden strabismus) as well as strabismus (or squint).

[0003] As Figure 19 shown, strabismus is divided into esotropia (a), exotropia (b), hypertropia (c) and hypotropia (d) according to the direction of deviation, and there is intermittent exotropia, that is, when the eyes experience fatigue due to looking at a point for a long time, one eye rotates outwards, while the eyes are normal under normal circumstances.

[0004] Strabismus can have various causes, including: brain diseases, such as brain tumors; metabolic disorders, such as hyperlipidemia; diabetes and hypertension; thyroid abnormalities; inflammation of the eye muscles; or injuries around the eyes, and in many cases, the cause is unknown, and strabismus may also be congenital.

[0005] Patients with strabismus experience symptoms such as blurred vision, diplopia, headache, decreased depth perception, and excessive squinting, and in some cases, strabismus may also cause amblyopia (amblyopic eye). 80% of strabismus patients are children and adolescents.

[0006] A known treatment method for strabismus involves treatment at a vision training center. However, this treatment method has disadvantages in terms of cost and time because patients need to visit the vision training center for a long time.

[0007] Another known treatment method for strabismus is surgical intervention. However, surgical intervention is only possible for patients with a deviation angle of 15 prism diopters or more, and is not suitable for children and adolescents with a deviation angle of less than 15 prism diopters. In addition, surgical intervention requires general anesthesia, which may pose a risk of side effects to children and adolescents.

[0008] In addition, surgical methods for strabismus have limitations as a treatment option because, regardless of the type of strabismus, two main techniques are used: recession, which involves lengthening the eye muscle and reattaching it further back; and resection, which involves cutting and reattaching the muscle. In addition, surgical methods for strabismus involve weakening the stronger muscles around the eye, resulting in an overall weakening of the eye muscles after treatment.

[0009] Therefore, there is a need for non-invasive therapeutic interventions for strabismus that can effectively improve symptoms without side effects, even for children and adolescents. Summary of the Invention

[0010] An object of the present invention is to provide a visual training device and method that are non-invasive and can effectively improve the symptoms of strabismus and vision without surgical intervention or surgical procedures.

[0011] The problems to be solved by the present invention are not limited to those mentioned above, and those skilled in the art will clearly understand from the following description that there are also other problems not mentioned above.

[0012] The visual training device according to an embodiment of the present invention preferably includes: a storage unit that stores the deviation angle of the user; and a control unit that guides the movement of the user's eyes based on the deviation angle.

[0013] Preferably, the control unit includes: a strabismus correction value determination unit that determines a strabismus correction value based on the deviation angle; and a visual training unit that sets a training range based on the strabismus correction value and guides the movement of the user's eyes based on the training range.

[0014] Preferably, the storage unit stores information indicating the deviation direction, the strabismus correction value includes a correction direction opposite to the deviation direction and at least one or more correction prism diopters less than the deviation angle, and the training range includes at least one or more of the at least one or more correction prism diopters.

[0015] Preferably, the training range includes an interval in which fusion progresses relatively quickly and an interval in which fusion progresses relatively slowly.

[0016] The visual training device according to an embodiment of the present invention preferably includes: a storage unit that stores information indicating the deviation of the user's eyes and at least one or more correction information for correcting the deviation of the user's eyes; and a control unit that guides the user's eyes to move in a direction different from the deviation direction based on at least one of the at least one or more correction information.

[0017] Preferably, the at least one or more correction information differ in the time required for binocular fusion.

[0018] Preferably, the at least one or more correction information guides the user's eyes to move in a direction opposite to the direction of the deviation.

[0019] Preferably, the at least one or more correction information is at least one or more prism diopters.

[0020] Preferably, the at least one or more prism diopters includes at least one or more or a combination thereof of a prism diopter associated with the deviation angle of the user's eyes, a prism diopter less than the deviation angle and achieving the minimum fusion of the user's eyes, and a prism diopter less than the deviation angle and greater than the minimum prism diopter.

[0021] Preferably, the prism diopter less than the deviation angle and greater than the minimum prism diopter is the prism diopter at which diplopia becomes single vision.

[0022] A visual training method according to an embodiment of the present invention includes: measuring a fusion adaptation time for each of a plurality of refractive angles less than the deviation angle of the user's eyes; determining a training time for changing the refractive angle to the plurality of refractive angles based on the fusion adaptation time; determining at least one or more of the plurality of refractive angles as a training range; and changing the refractive angle to at least one or more refractive angles included in the training range according to the training time to guide the movement of the user's eyes.

[0023] Preferably, the at least one or more refractive angles included in the training range includes the refractive angle at which diplopia becomes single vision.

[0024] Preferably, the at least one or more refractive angles included in the training range includes the minimum refractive angle at which binocular fusion is achieved.

[0025] Preferably, the at least one or more refractive angles included in the training range includes the deviation angle of the user's eyes.

[0026] Preferably, the fusion adaptation times required to achieve the functions of both eyes measured for the plurality of refractive angles are different from each other. Description of the Drawings

[0027] Figure 1 is a block diagram illustrating a visual training device according to an embodiment of the present invention.

[0028] Figure 2 is a perspective view illustrating a visual training device according to an embodiment of the present invention.

[0029] Figure 3 is a perspective view illustrating a visual training device according to an embodiment of the present invention.

[0030] Figure 4 It is a view showing a sensor unit for capturing the condition of an eye according to an embodiment of the present invention.

[0031] Figure 5 It is a perspective view showing a visual training device having a blocking unit.

[0032] Figure 6 It is a perspective view showing a prism lens assembly and a gear according to an embodiment of the present invention.

[0033] Figure 7 It is a cross-sectional view of the prism lens assembly taken along line A-A' of Figure 5 .

[0034] Figure 8 (a) to Figure 8 (d) are schematic views showing a prism lens as viewed from the X-Y plane according to an embodiment of the present invention.

[0035] Figure 9 (a) to Figure 9 (b) are views showing the eyes of a user with exotropia and a plurality of prism lenses as viewed from the x-y plane.

[0036] Figure 10 (a) to Figure 10 (b) are views showing the eyes of a user with esotropia and a plurality of prism lenses as viewed from the x-y plane.

[0037] Figure 11 (a) to Figure 11 (b) are schematic views showing a prism lens as viewed from the y-z plane according to an embodiment of the present invention.

[0038] Figure 12 (a) to Figure 12 (b) are views showing the eyes of a user with hypertropia and a plurality of prism lenses as viewed from the y-z plane.

[0039] Figure 13 (a) to Figure 13 (b) are views showing the eyes of a user with hypotropia and a plurality of prism lenses as viewed from the y-z plane.

[0040] Figure 14 It is a view for depicting a visual training device according to an embodiment of the present invention.

[0041] Figure 15 It is a view for depicting a visual training device having an augmented reality (AR) function according to another embodiment of the present invention.

[0042] Figure 16 It is a diagram depicting a visual training device with virtual reality (VR) function according to another embodiment of the present invention.

[0043] Figure 17 It is a flowchart showing a visual training method according to an embodiment of the present invention.

[0044] Figure 18 It is a view for depicting the skew direction and the correction direction.

[0045] Figure 19 (a) to Figure 19 (d) are schematic diagrams illustrating various types of strabismus.

[0046] Figure 20 It is a view for depicting a visual training method according to an embodiment of the present invention.

[0047] Figure 21 It is a view for depicting a visual training method according to an embodiment of the present invention.

[0048] Figure 22 It is a view for depicting a visual training method according to an embodiment of the present invention.

[0049] Figure 23 It is a view for depicting a visual training method according to an embodiment of the present invention.

[0050] Figure 24 It is a view for depicting a visual training method according to an embodiment of the present invention.

[0051] Figure 25 It is a view for depicting a visual training method according to an embodiment of the present invention.

[0052] Figure 26 It is a view for depicting a visual training method according to an embodiment of the present invention.

[0053] Figure 27 It is a view for depicting a visual training method according to an embodiment of the present invention. Detailed Description of the Invention

[0054] Hereinafter, a visual training device and a visual training method according to an embodiment of the present invention will be described in detail.

[0055] Figure 1 It is a block diagram illustrating a visual training device 100 according to an embodiment of the present invention.

[0056] The vision training device 100 according to an embodiment of the present invention includes a control unit 151, a storage unit 152, a communication unit 153, a refraction angle adjustment unit 154, a user input unit 155, and a deviation angle determination unit 156.

[0057] The deviation angle determination unit 156 determines the deviation angle and the deviation direction of the eyes of a user with strabismus. Here, the "deviation angle" refers to the degree of strabismus, which represents the amount of deviation of the eyes when looking straight ahead, and is generally represented by a refraction angle such as prism diopter (PD).

[0058] Here, the "deviation angle" is represented by a single prism diopter and also includes a certain range of deviation amounts (hereinafter referred to as "deviation angle range") centered on a specific prism diopter. For example, when the "deviation angle" is represented as 14 prism diopters, it should be understood that 14 prism diopters include a deviation angle range from 14.4 prism diopters to 13.6 prism diopters. In the present invention, an example of representing the deviation angle by using prism diopter (PD) is described, but the deviation angle according to the present invention is not limited to the example using PD and can also be represented by other units.

[0059] The deviation direction represents the deviation direction of the eyes when looking straight ahead and can be represented by using an angle, as Figure 18 shown.

[0060] Prism diopter (PD) is a value representing the degree of refraction of light when passing through a prism lens and is represented by △. One unit (1PD (△)) of prism diopter (△) means a refractive deviation of 1 cm at a distance of 100 cm.

[0061] The deviation angle and the deviation direction can generally be determined by an ophthalmologist through tests such as the cover test, the modified Thorington test (MTT), the Maddox rod test (MRT), and the alternate prism cover test (PCT). However, in the present invention, the deviation angle and the deviation direction are determined by the deviation angle determination unit 156. When the ophthalmologist determines the deviation angle and the deviation direction, the deviation angle and the deviation direction of the user determined by the ophthalmologist can be obtained through the user input unit 155 or the communication unit 152 and stored in the storage unit 152. To determine the deviation angle, the deviation angle determination unit 156 measures the fusion adaptation time at each prism diopter while changing the prism diopter in intervals of a predetermined unit (for example, in units of 0.5PD or in units of 1PD), and detects the fusion state information of the user's eyes.

[0062] Here, the fusion adaptation time refers to the time required for the user's eyes to achieve fusion at a given prism diopter, and the fusion state information includes at least one or more or a combination of a slow fusion (SF) starting point, a separation point, a recovery point, an SF interval, and a fast fusion (FF) interval. These fusion adaptation times and fusion state information may change as the user's visual acuity improves over time or through visual training. Therefore, it is desirable to measure or determine the fusion adaptation time and fusion state information regularly (e.g., monthly). The deviation angle determination unit 156 can measure the fusion adaptation time or determine the fusion state information in a corrected eye state, such as when wearing prism glasses.

[0063] In Figure 20 , PDA represents the axis indicating the prism diopter. The left side of this axis represents a prism diopter greater than the user's deviation angle, and the right side represents a prism diopter less than the user's deviation angle. In other words, PD1 to PD9 represent prism diopters greater than the deviation angle (PD10), and PD11 to PD20 represent prism diopters less than the deviation angle.

[0064] The SF interval represents the range of prism diopters in which function and diplopia occur alternately. Therefore, it takes a long time to achieve the final function, resulting in slow function, and it is Figure 20 the range of PD1 to PD5 and the range of PD16 to just before PD20 in

[0065] The FF interval represents the range of prism diopters (range of deviation angles) in which fusion occurs rapidly, which is Figure 20 the range of PD5 to PD16 in

[0066] When the prism diopter changes along the PDA from a value greater than the user's deviation angle towards the deviation angle, within the prism diopter range (PD1 to PD5) (SF interval), as it gets closer to the deviation angle, the image appears blurred. Within the prism diopter range corresponding to the deviation angle range (PD5 to PD16), fusion occurs rapidly, and the image is seen clearly. Then, when the prism diopter further changes from the deviation angle towards 0 prism diopter, within the prism diopter range (PD16 to PD20) (SF interval), fusion occurs slowly again. Then, when the prism diopter further changes towards 0 prism diopter, at the prism diopter (PD20) (separation point), diplopia occurs, and fusion no longer occurs. Then, when the prism diopter changes from the separation point towards the deviation angle, at a specific prism diopter (PD12) (recovery point), diplopia becomes single vision. The recovery point may occur at any prism diopter within the FF interval ( Figure 20 PD12 in Figure 20in PD16). This is because the appearance of the recovery point depends on the user's visual characteristics.

[0067] Here, the SF starting point means the prism diopter (PD1 and PD16) at which binocular fusion occurs but takes a relatively long time to achieve. The SF interval is the range in which fusion and diplopia for a certain target alternate and repeat. The separation point of the eyes refers to the prism diopter (PD20) at which fusion no longer occurs, and the target appears as two images. At and below the separation point, the fusion of the eyes no longer occurs. The recovery point of the eyes refers to the prism diopter (PD12) at which diplopia becomes single vision again.

[0068] As Figure 20 shown, fusion occurs slowly within the SF interval and rapidly within the FF interval. Fusion does not occur from the prism diopter corresponding to the separation point or a smaller prism diopter. The fusion adaptation time is the shortest at the deviation angle, which means that fusion occurs most rapidly at the deviation angle. The deviation angle determination unit 156 preferably determines the prism diopter at which fusion occurs most rapidly within the FF interval as the deviation angle.

[0069] The deviation angle determination unit 156 stores the fusion adaptation time at each measured prism diopter in the storage unit 152, and the fusion adaptation time is used to determine the training time for each prism diopter. The interval of the prism diopter at which the deviation angle determination unit 156 measures the fusion adaptation time is determined according to the user's visual characteristics and can be input through the user input unit 155, or a fixed unit such as 0.5 PD or 1 PD can be used. The deviation angle determination unit 156 preferably measures the fusion adaptation time regularly (e.g., monthly) and determines the fusion state information and the training range, because the training range may change due to the improvement of visual acuity through visual training.

[0070] The deviation angle determination unit 156 may include a sensor that can measure or determine at least one or more or a combination of the user's deviation angle (or strabismus range), deviation direction, and fusion state information, and determines at least one or more or a combination of the deviation angle (or deviation angle range), deviation direction, and fusion state information through the sensor.

[0071] Information on at least one or more or a combination of the deviation angle (or deviation angle range), deviation direction, and fusion state information determined by the deviation angle determination unit 156 is stored in the storage unit 152.

[0072] The deviation angle determination unit 156 may include at least one or more cameras that capture the user's eyes and may be configured to have an image analysis and processing function to analyze the images captured by the cameras.

[0073] As Figure 4As shown in [figure], the skew angle determination unit 156 performs image analysis processing on the video captured by the camera to track the user's eyes (e.g., subtle changes in the pupil), and determines at least one or more or a combination of the skew angle (or skew angle range), skew direction, and fusion state information.

[0074] For example, within the SF interval, each time the prism diopter changes, the fixation of a user with strabismus moves in a direction different from the direction expected by the change in the prism diopter, causing the pupil to tremble. After a specific period of time, the pupil adapts and the trembling stops. When the prism diopter is changed again, the trembling occurs again, and after a specific period of time, the pupil adapts and the trembling stops. Within the FF interval, the fixation, i.e., the pupil, moves in the direction expected by the change in the prism diopter without trembling. When the prism diopter changes to the separation point after passing through the SF interval, the user's fixation does not follow the direction expected by the change in the prism diopter, and the user's fixation shifts back to the original skew direction. When the prism diopter continuously changes from the separation point towards the skew angle (i.e., if the prism diopter increases), the user's fixation direction remains fixed and does not change from the skew direction until a specific prism diopter is reached, from where the user's fixation direction starts to change to the fixation direction expected by the prism diopter, and this prism diopter can be detected as the recovery point. When the prism diopter changes from the recovery point towards the skew angle, the user's fixation moves in the direction expected by the change in the prism diopter, causing the pupil to move. In this way, image analysis processing is performed on the video captured by the camera to track the user's eyes (e.g., subtle changes in the pupil), and determines at least one or more or a combination of the skew angle (or skew angle range), skew direction, and fusion state information.

[0075] Here, the "fixation" or "fixation direction" of the eye can be defined by an imaginary line formed by the light incident on the cornea and lens of the eye and reaching the fovea of the retina.

[0076] As described above, the skew angle determination unit 156 performs image analysis processing on the video captured by the camera, for example, to detect at least one or more or a combination of the skew angle (or skew angle range), skew direction, and fusion state information of the user's eyes, and determines the range within which the user's left eye, right eye, or both eyes can move (hereinafter referred to as the "eye movement range"), and stores this eye movement range in the storage unit 152.

[0077] For example, the eye movement range stored in the storage unit 152 can be used to set the visual training range applicable to the user's eyes. Especially for users in the early childhood stage, it is preferable to perform visual training after detecting the maximum range within which the eyes can move, because the muscles around their eyes may not be fully developed.

[0078] The eye movement range preferably includes prism diopters (PD5 to PD19) from the prism diopter (PD5) corresponding to the starting point of the FF interval to the prism diopter (PD19) corresponding to the final fusion point that provides the final fusion state just before the diplopia occurrence separation point (PD20) (hereinafter referred to as "final fusion prism diopter"). More preferably, the eye movement range includes prism diopters (PD10 to PD19) from the prism diopter (PD10) corresponding to the deviation angle to the final fusion prism diopter (PD19). Here, the eye movement range does not necessarily match the training range described later. Preferably, the training range described later is within or the same as the eye movement range.

[0079] The control unit 151 includes a strabismus correction value determination unit 151B and a visual training unit 151C.

[0080] The strabismus correction value determination unit 151A determines a strabismus correction value for performing visual training to improve the user's strabismus based on the deviation angle and deviation direction of the user determined by the deviation angle determination unit 156 or an ophthalmologist, and stores the strabismus correction value in the storage unit 152. Here, the strabismus correction value refers to correction information for moving the user's eyes in the direction opposite to the determined deviation angle to improve the user's strabismus, and may include a correction direction and a correction prism diopter (or correction refractive angle). The correction direction is a direction different from the deviation direction, preferably the direction exactly opposite to the deviation direction. The correction prism diopter includes at least one or more prism diopters to move the eyes as needed.

[0081] For example, when the user's eyes are deviated at a deviation angle (PD10) of 16 PD (△) in the deviation direction of 30°, the prism diopter corresponding to the separation point (PD19) is 11 PD, and the final fusion prism diopter (PD19) is 11.5 PD. The deviation angle correction value includes a correction direction indicating 210° (see Figure 18 ) and at least one or more or a combination of the correction prism diopters PD11 (15.5 PD), PD12 (15 PD), PD13 (14.5 PD), PD14 (14 PD), PD15 (13.5 PD), PD16 (13 PD), PD17 (12.5 PD), PD18 (12 PD), and PD19 (11.5 PD). If the user is in a corrected eye state, for example, by wearing prism glasses, the deviation angle (PD10) becomes 0 PD, the prism diopter corresponding to the separation point (PD20) is -5 PD, and the final fusion prism diopter (PD19) is -5.5 PD. The deviation angle correction value includes a correction direction indicating 210° (see Figure 18)and at least one or more or a combination thereof of corrective prism diopters of -0.5 PD, -1.0 PD, -1.5 PD, -2.0 PD, -2.5 PD, -3.0 PD, -3.5 PD, -4.0 PD, and -4.5 PD. Here, the minus sign (-) in PD indicates the corrective direction opposite to the user's deviation direction. Figure 18 is a diagram depicting the deviation direction. As described above, the deviation direction can be represented by an angle.

[0082] The strabismus correction value determination unit 151A preferably determines at least one or more prism diopters within the eye movement range as the corrective prism diopters.

[0083] The strabismus correction value determination unit 151A stores the information on the determined corrective direction and corrective prism diopters in the storage unit 152.

[0084] The storage unit 152 includes user information such as the user's name, age, and gender, and at least one or more or a combination thereof of the user's deviation angle information, deviation direction information, fusion state information, and strabismus correction value information.

[0085] The storage unit 152 also stores the visual training information for each user. The visual training information includes information such as the training range, training time, visual training history, and training speed determined based on the fusion adaptation time measured for each user at each of the multiple corrective prism diopters. The training speed is the speed at which the prism diopter is changed to each corrective prism diopter included in the training range or the holding time for holding the prism diopter at the corrective prism diopter. The training speed is preferably determined based on the fusion adaptation time measured at each of the multiple corrective prism diopters and is preferably proportional to or the same as the fusion adaptation time, for example.

[0086] The storage unit 152 may include at least one or more or a combination thereof of a flash memory type, a hard disk type, a solid state drive (SSD) type, a silicon disk drive (SDD) type, a multimedia card micro type, a cartridge memory (e.g., SD or XD memory), a random access memory (RAM), a static random access memory (SRAM), a read-only memory (ROM), an electrically erasable programmable read-only memory (EEPROM), a programmable read-only memory (PROM), a magnetic memory, a magnetic disk, and an optical disk.

[0087] The visual training unit 151B performs visual training to improve strabismus based on at least one or more or a combination thereof of the user information, deviation angle information, deviation direction information, fusion state information, strabismus correction value, and visual training information stored in the storage unit.

[0088] The visual training unit 151B determines the training range by determining at least one or more correcting prism diopters to be included in the training range from among the correcting prism diopters based on the deviation angle information, the fusion state information, and the strabismus correction value. For example, the training range is determined based on the deviation angle (or strabismus range), the separation point, and the recovery point determined by the deviation angle determination unit 156.

[0089] The training range preferably includes at least one or more prism diopters within the eye movement range. For example, the training range may include at least one or more correcting prism diopters within the range from the deviation angle to the last fusion point, or at least one or more correcting prism diopters within the range from the recovery point to the last fusion point. Additionally, the training range may include at least one or more correcting prism diopters within the range from the SF starting point to the last fusion point.

[0090] Instead of using the fusion adaptation time for each prism diopter measured by the deviation angle determination unit 156, the visual training unit 151B may newly select at least one or more prism diopters from within the prism diopter range within the eye movement range as new units, measure the fusion adaptation time for each selected prism diopter, and the strabismus correction value determination unit 151A may determine the at least one or more selected prism diopters as the correcting prism diopters and set the correcting prism diopters as the training range.

[0091] The visual training unit 151B performs visual training while causing the user's eyes to move by changing the prism diopter at a speed corresponding to the fusion adaptation time for each prism diopter measured by the deviation angle determination unit 156, based on the at least one or more correcting prism diopters determined by the strabismus correction value determination unit 151A and included in the training range, and the correction direction.

[0092] For example, referring to Figure 20, when the interval from the restoration point (PD12) to the last fusion point (PD19) is determined as the training range, the visual training unit 151B changes the prism diopter based on the training speed or the maintenance time, which is determined for each prism diopter according to the fusion adaptation time measured at each prism diopter PD12 to PD19. When the prism diopter is sequentially changed from PD12 to PD19, the prism diopter decreases from PD12 to PD16 at a relatively fast training speed, and decreases from PD17 to PD19 at a relatively slow training speed. When the prism diopter is changed from PD19 to PD12, the prism diopter increases from PD19 to PD16 at a relatively slow training speed, and increases from PD15 to PD12 at a relatively fast training speed. The operation of changing the prism diopter is repeatedly executed, so that the user's gaze direction moves in the deviation direction and then in the correction direction within the eye movement range, thereby enabling the training of the weak muscles causing strabismus and fundamentally correcting strabismus.

[0093] Reference Figure 21 , in the case of exotropia, as the prism diopter sequentially changes from PD12 to PD19, the gaze of the eye moves to the center (correction direction), as shown in Figure 21 (a), and as the prism diopter sequentially changes from PD19 to PD12, the gaze of the eye moves to the deviation direction, as shown in Figure 21 (b). By reciprocating the eye in the deviation direction and the correction direction in this way, the weak muscles causing strabismus can be strengthened, thereby improving the deviation amount of the eye. Here, the gaze of the eye being at the center of the eye means the gaze direction of a normal person without strabismus when looking straight ahead.

[0094] Reference Figure 22 , in the case of esotropia, as the prism diopter sequentially changes from PD12 to PD19, the gaze of the eye moves towards the center, as shown in Figure 22 (a), and as the prism diopter sequentially changes from PD19 to PD12, the gaze of the eye moves to the deviation direction, as shown in Figure 22 (b). By reciprocating the eye in the deviation direction and the correction direction in this way, the weak muscles causing strabismus can be strengthened, thereby improving the deviation amount of the eye.

[0095] Visual training for vertical strabismus is performed in a manner similar to the above esotropia and exotropia.

[0096] Reference Figure 23 , even in the case of a specific deviation direction, as the prism diopter sequentially changes from PD12 to PD19, the gaze of the eye moves towards the center, as shown in Figure 23As shown in (a), as the prism diopter sequentially changes from PD19 to PD12, the eye gaze moves to the deviation direction, as Figure 23 shown in (b). By reciprocating the eye in the deviation direction and the correction direction in this way, the weak muscles causing strabismus can be strengthened, thereby improving the amount of eye deviation.

[0097] The refraction angle adjustment unit 154 adjusts the refraction angle of the light incident on the user's eye, and is configured to adjust the refraction angle of the light incident on the user's eye based on at least one or more or a combination of the deviation angle information, deviation direction information, fusion state information, and visual training information determined by the deviation angle determination unit 156 or an ophthalmologist.

[0098] For example, the refraction angle adjustment unit 154 may include at least one or more prisms, at least one or more micromirrors, a liquid lens, at least one or more image processors, or a combination thereof, and a driving unit for driving them to adjust the refraction angle. If the refraction angle adjustment unit 154 is configured with at least one or more image processors, an external image can be captured by a camera, and the refraction angle adjustment unit 154 can adjust the angle at which the captured external image is projected onto the user's eye based on at least one or more or a combination of the deviation angle information, deviation direction information, fusion state information, and visual training information.

[0099] However, the configuration of the refraction angle adjustment unit 154 according to an embodiment of the present invention is not limited to the above configuration, and the refraction angle adjustment unit 154 may adopt any configuration or element as long as the refraction angle of the light incident on the user's eye can be changed or adjusted.

[0100] For visual training, the refraction angle adjustment unit 154 obtains training information from the storage unit 152, and changes or adjusts the refraction angle of the light incident on the user's eye. For example, by changing the prism diopter according to the corrective prism diopter, training time, or training speed included in the training information, the movement of the user's eye is caused.

[0101] The user input unit 155 is configured to receive information from the user, and when information is input through the user input unit 155, the control unit 151 can control the operation of the vision training device 100 based on the input information. The user input unit may include at least one or more hardware physical keys (hereinafter referred to as "hard keys") or software touch keys (hereinafter referred to as "soft keys") or a combination thereof. For example, the hard keys may include buttons, dome switches, rotary dials, or toggle switches, which are located on at least one of the front, rear, and sides of the vision training device 100. For example, the touch keys may include at least one or more or a combination of virtual keys or visual keys displayed on the touch screen display unit through software processing, or touch keys located on parts other than the touch screen. The virtual keys or visual keys may have various forms and be displayed on the touch screen, for example, as graphics, text, icons, videos, or a combination thereof.

[0102] In addition, the user can input commands through the user input unit 155 to perform specific operations. These commands can also be input through wired or wireless communication between the user terminal (such as a mobile phone, tablet computer, or PC) and the vision training device 100. For example, the user can input commands to turn on the power of the vision training device 100, turn off the power of the vision training device 100, start vision training, end vision training, search for or select a vision training mode, or adjust the refraction angle through the refraction angle adjustment unit 154.

[0103] The communication unit 152 can communicate with the outside of the vision training device 100 through wired or wireless communication.

[0104] Hereinafter, specific configuration examples of the vision training device according to embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0105] Figure 2 is a perspective view showing the appearance of the vision training device 100 according to an embodiment of the present invention. In Figure 2 , the vision training device 100 according to an embodiment of the present invention is illustrated as an integrated device implemented as a single device, but the vision training device 100 according to the present invention is not limited to such an integrated device, and it should be understood that each component that can be separated into different devices that achieve the same function or operation falls within the scope of the present invention. For example, even when the refraction angle adjustment unit 154 is implemented as a configuration separated from the main body of the vision training device 100, as long as vision training can be performed according to embodiments of the present invention, such a configuration should be understood to fall within the scope of the present invention.

[0106] Refer to Figure 2 , the vision training device 100 according to an embodiment of the present invention may include a first housing 111, a second housing 112, a third housing 113, and a wearing part 114 as components constituting the appearance of the present invention.

[0107] The first housing 111, the second housing 112, and the third housing 113 are used to protect the main body 120 described later from external influences.

[0108] The first housing 111 has at least one or more holes of a predetermined size at positions corresponding to at least one or more of the eyepiece holes 121a and 121b described later, so that light from the outside or the screen can enter the user's eyes through the eyepiece holes 121a and 121b.

[0109] The second housing 112 may have holes of a predetermined size at positions corresponding to the adjustment levers 122a and 122b described later.

[0110] The third housing 113 has a portion that closely contacts the area around the user's eyes, and the portion that closely contacts the area around the user's eyes is made of an elastic soft material such as sponge, so that the user does not feel discomfort when wearing the vision training device 100.

[0111] The wearing portion 114 can be closely attached to the user's forehead and head, for example, so that the vision training device 100 does not fall off from the user's wearing state. The wearing portion 114 can be connected to the second housing 112 or the third housing 113 through a connecting portion such as a hinge.

[0112] Figure 3 is a perspective view showing an example of the main body 120 of the vision training device 100.

[0113] The main body 120 may include at least one or more eyepiece holes 121a and 121b, at least one or more adjustment levers 122a and 122b, at least one or more prism assemblies 130a and 130b, the first motors 141a, 141b, 141c, and 141d of the drive unit 140, the printed circuit boards 150a and 150b, and the user input unit 155 (see Figure 1 ).

[0114] In Figure 3 the example of the vision training device 100 shown in Figure 1The refraction angle adjustment unit 154 shown in [Fig.] is implemented by prism assemblies 130a and 130b each having two prism lenses and a driving unit 140, but the refraction angle adjustment unit 154 of the present invention is not limited to a configuration including prism assemblies 130a and 130b each having two prism lenses and a driving unit 140. For example, a configuration including at least one or more prism lenses, three or more prism lenses, at least one or more micromirrors, at least one or more image processors, or at least one or more liquid lenses instead of prism assemblies 130a and 130b each having two prism lenses also falls within the scope of the present invention, and the refraction angle adjustment unit 154 according to the present invention may have any configuration or element as long as the refraction angle of light incident on the user's eye can be changed.

[0115] The main body 120 may include at least one or more left and right eyepiece holes 121a and 121b formed at positions corresponding to the user's eyes. The left eyepiece hole 121a is formed at a position corresponding to the user's left eye. The right eyepiece hole 121b is formed at a position corresponding to the user's right eye. Light from the outside or the screen may enter the user's eyes through the left eyepiece hole 121a or the right eyepiece hole 121b.

[0116] The main body 120 may further include a left adjustment lever 122a and a right adjustment lever 122b. The user may adjust the distance between the prism lens assemblies 130a and 130b through the left adjustment lever 122a and the right adjustment lever 122b to match the distance between the user's eyes.

[0117] The main body 120 may include at least one of the left prism lens assembly 130a and the right prism lens assembly 130b described later. Each of the left prism lens assembly 130a and the right prism lens assembly 130b may be configured with at least one or more prism lenses. Embodiments of the present invention will focus on an example in which each of the prism assemblies 130a and 130b is configured with two prism lenses, but the scope of the present invention is not limited to this example.

[0118] The first motors 141a, 141b, 141c, and 141d of the driving unit 140 are configured to rotate a plurality of prism lenses 131a, 131b, 132a, and 132b to adjust or change the refraction angle of light incident on the prism lenses. For example, the first motor 141a rotates the left first prism lens 131a, the first motor 141b rotates the left second prism lens 132a, the first motor 141c rotates the right first prism lens 131b, and the first motor 141d rotates the right second prism lens 132b. A single first motor may be connected to transmit power to the plurality of prism lenses.

[0119] The vision training device 100 may include at least one or more printed circuit boards 150a and 150b, on which a single chip or multiple chips are mounted to implement the operations of the control unit 151, the storage unit 152, the communication unit 153, the refraction angle adjustment unit 154, and the user input unit 155. The printed circuit board 150a may be disposed on the left side of the main body 120, and the printed circuit board 150b may be disposed on the right side of the main body 120.

[0120] The control unit 151 controls the driving unit 140. The control unit 151 may control the driving unit 140 to rotate at least one of the plurality of prism lenses 131a, 131b, 132a, and 132b of the refraction angle adjustment unit 154. By rotating at least one of the plurality of prism lenses 131a, 131b, 132a, and 132b, the refraction angle of the incident light can be changed or adjusted to match the gaze direction of the user's left eye, right eye, or both eyes. The control unit 151 may also control the driving unit 140 to rotate at least one of the plurality of prism lenses 131a, 131b, 132a, and 132b according to the vision training information to change the refraction angle of the incident light.

[0121] The control unit 151 may retrieve the user's vision training information stored in the storage unit 152 and, based on the retrieved user vision training information, control the driving unit to rotate at least one of the plurality of prism lenses.

[0122] As Figure 5 shown, the main body 120 may further include at least one or more blocking units 160.

[0123] The blocking unit 160 may be disposed in front of (+y direction) the left eyepiece hole 121a or the right eyepiece hole 121b. The blocking unit 160 may be disposed on both the left eyepiece hole 121a and the right eyepiece hole 121b.

[0124] The driving unit 140 may further include a second motor 142 for driving the blocking unit 160 to open and close. The control unit 151 may control the second motor 142 such that the blocking unit 160 blocks light from entering the user's eyes through at least one of the left eyepiece hole 121a or the right eyepiece hole 121b.

[0125] Figure 6 is a perspective view of the prism lens assembly 130a and the gears 143a and 143b according to an embodiment of the present invention, and Figure 7 is a cross-sectional view of the prism lens assembly 130a taken along the line A-A' of Figure 5 .

[0126] The prism lens assembly 130a is disposed in association with the left eye, and the prism lens assembly 130b is disposed in association with the right eye. As Figure 6As shown, the first prism lens 131a on the left side is arranged further away from the user's eyes than the second prism lens 132a on the right side. Similarly, the first prism lens 131b on the left side is arranged further away from the user's eyes than the second prism lens 132b on the right side.

[0127] The first prism lens 131a is supported by the first prism lens support 133a, and the second prism lens 132a is supported by the second prism lens support 134a. Referring to Figure 6 , threads are formed on the first prism lens support 133a to engage with the rotating gear 143a, and threads are formed on the second prism lens support 132a to engage with the rotating gear 143b. For example, the driving force of the first motor 141a is transmitted to the first prism lens support 133a through the gear 143a, so that the first prism lens 131a can rotate independently of the second prism lens 132a. In a similar manner, the plurality of prism lenses 131a, 131b, 132a, and 132b can rotate independently.

[0128] The plurality of prism lenses 131a, 131b, 132a, and 132b can rotate counterclockwise or clockwise about the rotation axis (Y). For example, the plurality of prism lenses 131a, 131b, 132a, and 132b can rotate counterclockwise by 360° and clockwise by 360°.

[0129] Each of the plurality of prism lenses 131a, 131b, 132a, and 132b can have a circular cross-section with a diameter (Φ). The first prism lens 131a can have a maximum thickness (w1) and a minimum thickness (w2) in the Y-axis direction, and the second prism lens 132a can have a maximum thickness (w3) and a minimum thickness (w4) in the Y-axis direction. The first prism lens 131a and the second prism lens 132a can be prism lenses of the same specification with the same diameter, maximum thickness, minimum thickness, and refractive deviation angle. Although prism lenses with a circular cross-section are exemplarily described in the embodiments of the present invention, the scope of the present invention is not limited to this example, and prism lenses with a triangular or rectangular cross-section can also be used.

[0130] The diameter (Φ) of the circular cross-section of the prism lens 131a or 132a can be, for example, 25 mm to 30 mm. The minimum thickness w2 or w4 of the prism lens 131a or 132a is the thickness required for the fixed lens and is preferably 2 mm or less. The maximum thickness w1 or w3 of the prism lens 131a or 132a is preferably 2.3 mm or less.

[0131] Light from the outside passes through the first prism lens 131a and the second prism lens 132a and then enters the user's eye. More specifically, when the light sequentially passes through the first prism surface and the second prism surface of the first prism lens 131a, it is refracted according to the refractive indices of the first prism surface and the second prism surface of the first prism lens 131a. Subsequently, when the light sequentially passes through the third prism surface and the fourth prism surface of the second prism lens 132a, it is refracted again according to the refractive indices of the third prism surface and the fourth prism surface of the second prism lens 132a. The distance "d" between the first prism lens 131a and the second prism lens 132a is defined as the distance between the second prism surface and the third prism surface. This distance "d" is preferably designed to be as narrow as possible, as long as the first prism lens 131a and the second prism lens 132a do not interfere with each other during their rotation. The first prism surface is inclined at a predetermined angle with respect to the second prism surface, and the fourth prism surface is inclined at a predetermined angle with respect to the third prism surface.

[0132] For example, each of the prism lenses 131a, 132a, 131b, and 132b has a prism diopter of 10△. When the first prism lens 131a having a prism diopter of 10△ and the second prism lens 132a having a prism diopter of 10△ are arranged as shown in Figure 8 (a) or Figure 8 (b), the first prism lens assembly 130a having the prism lenses 131a and 132a can have a maximum prism diopter of 20△. As shown in Figure 8 (c) or (d) of, when the bases of the first prism lens 131a and the second prism lens 132a are arranged exactly opposite to each other, that is, when the first prism lens assembly 130a does not rotate and the second prism lens 132a rotates 180° around the rotation axis (Y) from the state of Figure 8 (a) or Figure 8 (b), the light passing through the first prism lens assembly 130a is not refracted. In this case, the first prism lens assembly 130a has a prism diopter of 0△, which is defined as the first prism lens assembly 130a being in a neutral state.

[0133] Figure 8 (a) to 8(d) are schematic views of the prism lenses observed from the X - Y plane. For ease of description, a method of defining the positions of the prism lenses based on the first prism lens 131a and the second prism lens 132a will be described.

[0134] The positions of the prism lenses can be represented by listing the directions in which the portions (bases) with the maximum thickness of the first prism lens 131a and the second prism lens 132a face as an ordered pair. For example, inFigure 7 In the case of (a), the position of the prism lens is represented as (+x, +x). In Figure 7 the case of (b), the position of the prism lens is represented as (-x, -x). In Figure 7 the case of (c), the position of the prism lens is represented as (+x, -x), and in Figure 7 the case of (d), the position of the prism lens is represented as (-x, +x). When the incident light and the refracted light passing through the prism lens assembly 130a are Figure 7 parallel to each other as shown in (c) and Figure 7 (d), the prism lens assembly 130a is in a neutral state.

[0135] As described above, each of the prism lenses 131a and 132a can rotate freely within a range of 360°. For example, each of the prism lenses 131a and 132a can rotate not only 0°, 45°, 90°, 135°, 180°, 225°, 270°, 315°, and 360° with respect to the reference axis, but also at any angle between these angles. Therefore, it can be understood that in addition to the Figure 8 positional relationships shown, there are also countless positional relationships between the prism lenses.

[0136] Figure 9 (a) and 9(b) are views showing the eyes of a user with exotropia in an uncorrected state and the prism lenses 131a and 132a as viewed from the X-Y plane.

[0137] Figure 9 (a) shows a state in which the gaze direction of the user's eyes turns outward at a predetermined angle (exotropia). Figure 9 (a) also shows that the direction of the light passing through the prism lenses 131b and 132b is not parallel to the gaze direction of the eyes. Therefore, in Figure 9 the case of (a), it is difficult to accurately form an image on the retina of the right eye, making it difficult to induce visual training for the user.

[0138] Figure 9 (b) shows a state in which the direction of the light passing through the prism lenses 131b and 132b is parallel to the gaze direction of the eyes. Different from the Figure 9 case in (a), in Figure 9 (b), the prism diopters provided by the prism lenses 131b and 132b are adjusted to the deviation angle or strabismus range of the user, so that an image is accurately formed on the retina. In the state where the image is accurately formed on the retina, multiple prism lenses can be controlled to rotate independently and freely to provide at least one or more desired prism diopters, so as to be similar to the Figures 21 to 23Guide the eyes to move within the user's eye movement range in such a way as to induce the user's visual training.

[0139] In order to control multiple prism lenses to rotate independently and freely to provide at least one or more desired prism diopters in a state where an image is accurately formed on the retina, only one of the two prism lenses can be rotated to provide the desired prism diopter, or the two prism lenses can be rotated symmetrically or asymmetrically (by different amounts of rotation) in opposite directions to provide the desired prism diopter, or the two prism lenses can be rotated in the same direction to provide the desired prism diopter.

[0140] This visual training can be performed when the user is in a naked-eye state (uncorrected eye state), or in a corrected eye state with separate prism glasses or spectacle lenses.

[0141] Figure 9 (b) shows the case where two prism assemblies 130b are in the base-in (BI) mode. Here, the fact that the prism assembly 130b is in the BI mode means that the first prism lens 131b and the second prism lens 132b are arranged such that both bases of the first prism lens 131b and the second prism lens 132b are positioned inwardly relative to the user's eyes, as Figure 8 shown in (b). That is, the left prism lens assembly 130a is in the (-x, +x) state, and the right prism lens assembly 130b is in the (+x, +x) state.

[0142] To change Figure 9 the prism assembly 130b in (a) from the neutral state to Figure 8 the BI mode in (b), the second prism lens 132b is rotated 180°.

[0143] Specifically, by rotating the right second prism lens 132b clockwise with the +Y direction as the rotation axis (Y) of the right second prism lens 132b, Figure 9 the prism assembly 130b in (a) can be changed from the neutral state to Figure 8 the BI mode in (b). In other words, the second prism lens 132b can be rotated such that the part with the minimum thickness passes over the upper side of the user's eye.

[0144] As described above, Figure 9 the prism assembly 130b in (a) can be converted from the neutral state to Figure 9 the BI mode in (b), but it can also be converted from any neutral state to Figure 9 the BI mode in (b). Specifically, to perform the control such that the left prism assembly 130a changes from as Figure 12The neutral state in (a) changes to the BI mode, which can control the first prism lens 131a on the left to rotate counterclockwise by 90° relative to the line of sight, and can control the second prism lens 132a on the left to rotate clockwise by 90° relative to the line of sight. Since the first prism lens 131a on the left and the second prism lens 132a on the left rotate in opposite directions, the vertical refraction of the entire left prism assembly 130a is canceled out.

[0145] Figure 10 (a) to Figure 10 (b) is a view showing the eyes of a user with esotropia and multiple prism lenses observed in the X-Y plane.

[0146] Figure 10 (a) and 10(b) both show the state in which the line of sight of the user's eyes turns inward at a predetermined angle (esotropia). Figure 10 (a) shows a state in which the direction of light passing through the prism lens 131a is not parallel to the line of sight of the eyes, and Figure 10 (b) shows a state in which the direction of light passing through the prism lenses 131a and 132a is parallel to the line of sight of the eyes.

[0147] For the same reason as described above, in Figure 10 (b), the prism diopters provided by the prism lenses 131a and 132a are adjusted to be consistent with the user's deviation angle or strabismus range, so that an image is accurately formed on the retina. In a state where the image is accurately formed on the retina, the multiple prism lenses can be controlled to rotate independently and freely to provide at least one or more desired prism diopters, so as to guide the eyes to move within the user's eye movement range in a manner similar to that described later Figures 21 to 23 to perform visual training thereby.

[0148] Figure 10 (b) shows the case where the two prism assemblies 130a are in the base-out (BO) mode. Here, the prism assembly 130a being in the BO mode means that the first prism lens 131a and the second prism lens 132a are arranged such that both bases of the first prism lens 131a and the second prism lens 132a are positioned outward relative to the user's eyes, as Figure 10 shown in (b). That is, the left prism lens assembly 130a is in the (+x, +x) state, and the right prism lens assembly 130b is in the (+x, -x) state.

[0149] To change the prism assembly 130a in Figure 10 (a) from the neutral state to Figure 10 (b) in the BO mode, the first prism lens 131a on the left can be rotated 180°.

[0150] Specifically, by rotating the left first prism lens 131a clockwise with the +Y direction as the rotation axis (Y) of the left first prism lens 131a, Figure 10 the prism assembly 130a in (a) can be changed from the neutral state to Figure 10 the BO mode in (b). In other words, the first prism lens 131a can be rotated so that the part with its minimum thickness passes above the user's eye.

[0151] As described above, Figure 10 the prism assembly 130a in (a) can be converted from the neutral state to Figure 10 the BO mode in (b), but can also be converted from any neutral state to Figure 10 the BO mode in (b). Specifically, in order to perform the control such that the left prism assembly 130a changes from the neutral state as in Figure 12 (a) to Figure 10 the BO mode in (b), the left first prism lens 131a can be controlled to rotate 90° clockwise relative to the gaze direction, and the left second prism lens 132a can be controlled to rotate 90° counterclockwise relative to the gaze direction. Since the left first prism lens 131a and the left second prism lens 132a rotate in opposite directions, the vertical refraction of the entire left prism assembly 130a is cancelled.

[0152] Figure 11 (a) to 11(b) are schematic views of the prism lens observed in the Y-Z plane according to an embodiment of the present invention.

[0153] According to the method of defining the position of the prism lens as described above, in the case of Figure 11 (a), the left prism lens assembly 130a is in the (+z, +z) state, and in the case of Figure 10 (b), it is in the (-z, -z) state.

[0154] Since the prism lenses 131a and 132a can each rotate 360° counterclockwise or clockwise as described above, it can be understood that in addition to the Figure 10 positional relationship shown, there are also countless positional relationships between the prism lenses.

[0155] Figure 12 (a) and 12(b) are views showing the user's eye with exotropia and multiple prism lenses observed in the Y-Z plane.

[0156] Figure 12 (a) and Figure 12 (b) show the state (exotropia) in which the gaze directions of the user's both eyes are turned upward at a predetermined angle. Figure 12(a) shows a state where the direction of light passing through the prism lenses 131a and 132a is not parallel to the gaze direction of the eye, and Figure 12 (b) shows a state where the direction of light passing through the prism lenses 131a and 132a is parallel to the gaze direction of the eye.

[0157] For the same reason as described above, in Figure 12 (b), the prism diopters provided by the prism lenses 131a and 132a are adjusted to be consistent with the user's deviation angle or strabismus range, so that the image is accurately formed on the retina. In a state where the image is accurately formed on the retina, multiple prism lenses can be controlled to rotate independently and freely to provide at least one or more desired prism diopters, so as to guide the eyes to move within the user's eye movement range in a manner similar to that described later Figures 21 to 23 to perform visual training thereby.

[0158] Figure 12 (b) shows the case where the prism assembly 130a is in the base-down (BD) mode. Here, the prism assembly 130a being in the BD mode means that the first prism lens 131a and the second prism lens 132a are arranged such that their thickness increases downward relative to the user's eyes, as Figure 12 (b) shows. That is, the left prism lens assembly 130a is in the (-z, -z) state.

[0159] To change the prism lens assembly 130a from Figure 12 (a) from the neutral state to Figure 12 (b) the BD mode, the second prism lens 132a can be rotated 180°.

[0160] Specifically, to change from Figure 9 (a) from the neutral state to Figure 12 (b) the BD mode, or from Figure 10 (a) from the neutral state to Figure 12 (b) the BD mode, the neutral state as in Figure 12 (a) can be first formed, and then this neutral state can be converted to Figure 12 (b) the BD mode.

[0161] Specifically, first control the first prism lens 131a and the second prism lens 132a to rotate 90° simultaneously in the same direction around the Y axis to form the neutral state as in Figure 12 (a), and then only rotate the second prism lens 132a around the Y axis to thereby form Figure 12(b) The BD mode. Alternatively, by controlling the first prism lens 131a and the second prism lens 132a to rotate around the Y-axis in different directions, the Figure 12 (b) The BD mode.

[0162] Figure 13 (a) and 13(b) are views showing the eyes of a user with hypotropia and multiple prism lenses as viewed from the Y-Z plane.

[0163] Figure 13 (a) and Figure 13 (b) show the state in which the fixation directions of the user's binocular eyes are turned downward at a predetermined angle (hypotropia). Figure 13 (a) shows the state in which the direction of light passing through the prism lenses 131a and 132a is not parallel to the fixation direction of the eyes, and Figure 13 (b) shows the state in which the direction of light passing through the prism lenses 131a and 132a is parallel to the fixation direction of the eyes.

[0164] For the same reason as described above, in Figure 13 (b), the prism diopters provided by the prism lenses 131a and 132a are adjusted to be consistent with the deviation angle or the strabismus range of the user, so that the image is accurately formed on the retina of the left eye. In the state where the image is accurately formed on the retina, the multiple prism lenses can be controlled to rotate independently and freely to provide at least one or more desired prism diopters, so as to guide the eyes to move within the eye movement range of the user in a manner similar to that described later Figures 21 to 23 to perform visual training thereby.

[0165] Figure 13 (b) shows the case where the prism assembly 130a is in the base-up (BU) mode. Here, the prism assembly 130a being in the BU mode means that the first prism lens 131a and the second prism lens 132a are arranged such that their thickness increases upward with respect to the user's eyes, as Figure 13 (b) shows. That is, the left prism lens assembly 130a is in the (+z, +z) state.

[0166] To change the left prism lens assembly 130a from Figure 13 (a) the neutral state to Figure 13 (b) the BU mode, the first prism lens 131a can be rotated 180°.

[0167] Specifically, to change from Figure 9 (a) the neutral state to Figure 13 (b) the BU mode, or to change from Figure 10 (a) the neutral state to Figure 13(b) The BU mode in can first form a neutral state as shown in Figure 13 (a), and then this neutral state changes to Figure 13 the BU mode in (b).

[0168] Specifically, first control the first prism lens 131a and the second prism lens 132a to rotate 90° simultaneously in the same direction to form Figure 13 the neutral state in (a), and then only rotate the first prism lens 131a to thereby form Figure 13 the BU mode in (b). Alternatively, by controlling the first prism lens 131a and the second prism lens 132a to rotate in different directions around the Y-axis, the BU mode in Figure 13 (b) can be formed.

[0169] As described above, the prism assembly 130a can change from Figure 13 the neutral state in (a) to Figure 13 the BU mode in (b), but can also change from any neutral state to Figure 13 the BU mode in (b).

[0170] In this specification, Figure 19 esotropia in (a), Figure 19 exotropia in (b), Figure 19 hypertropia in (c) and Figure 19 hypotropia in (d) are described as representative examples of strabismus states. However, the prism lenses 131a, 132a, 131b, and 132b of the vision training device 100 can rotate freely in a counterclockwise or clockwise direction at a desired angle, thereby resulting in the effect of enhancing or improving the binocular fusion force for strabismus in any direction other than esotropia, exotropia, hypertropia, and hypotropia.

[0171] Figure 24 is a diagram showing the refractive angle determination unit 154 including a single prism lens. In Figure 24 , 131c represents the prism lens, and the part corresponding to the arrowhead represents the base. In Figure 24 (a), the prism lens is in the BI mode, and Figure 24 (b) shows a case where the user has exotropia. The prism lens 131c has a prism diopter associated with the deviation angle of the user to correct the user's strabismus. When the vision training unit 151B performs vision training, the refractive angle adjustment unit 154, based on the deviation angle information, strabismus correction value information, deviation direction information, and vision training information included in the vision training information, in accordance with Figure 24(a), the order of (1), (2), and (3) is used to change the prism diopter to at least one or more corrective prism diopters included within the training range, thereby changing the refraction angle. Thus, the user's gaze moves in the order of (1), (2), and (3), as shown in Figure 24 (b).

[0172] However, when using a single prism, the user's gaze moves in an elliptical manner, as shown in Figure 25 (b), rather than in a substantially linear manner, as shown in Figures 20 to 23 . In particular, when the user's gaze moves upward in an elliptical manner, the user's eye fatigue increases, resulting in dizziness.

[0173] To prevent the user's gaze from moving upward in an elliptical manner during visual training, it is preferable to control the prism lenses 131a, 131b, 132a, and 132b included in the prism assemblies 130a and 130b to rotate symmetrically in different directions (with the same rotation amount for each prism lens) or asymmetrically (with different rotation amounts for each prism lens), while causing the gaze to move downward in an elliptical manner. For this purpose, as described above, the prism lenses 131a, 131b, 132a, and 132b included in the prism assemblies 130a and 130b are configured to rotate independently.

[0174] Figure 25 is a schematic diagram showing the visual training of a visual training device 100 including a refraction angle determination unit 154 according to an embodiment of the present invention. The refraction angle determination unit 154 includes two prism lenses. In Figure 25 , 131a and 132a represent prism lenses, and the portion corresponding to the arrowhead represents the base. In Figure 25 , each of the two prism lenses is in the BI mode, and visual training is performed in an uncorrected eye state where the user does not wear prism lens glasses and the user has exotropia. The prism diopters provided by the two prism lenses 131a and 131b have prism diopters associated with the user's deviation angle to improve the user's strabismus. When the visual training unit 151B performs visual training, the refraction angle adjustment unit 154 is based on the visual training information and at least one or a combination of the deviation angle information, strabismus correction value information, deviation direction information, and fusion state information included in the visual training information, in accordance with Figure 25(a), the order of (1), (2), (3), (4) and (5) is used to change the refraction angle. Preferably, the two prism lenses 131a and 131b are simultaneously controlled to rotate in different directions so that their prism diopters are changed to at least one or more corrective prism diopters included in the training range. Therefore, the user's gaze moves in a substantially linear manner in the order of (1), (2), (3), (4) and (5), as shown in Figure 25 (b). In this case, since the user's gaze moves in a substantially linear manner, eye fatigue or dizziness can be prevented from increasing.

[0175] associated with Figure 25 (2) to (4) in (a) and (b) is less than the deviation angle ( Figure 20 PD12 in) and greater than the separation point ( Figure 20 PD20 in). By repeatedly performing Figure 25 (1) to (5) in (a) and (b), the weak muscles that are the root cause of exotropia can be strengthened.

[0176] In the above embodiment, the refraction angle determination unit 154 including a single prism lens or two prism lenses is mainly described, but the refraction angle determination unit 154 may include three or more prism lenses. In this case, as long as the prism lenses can be controlled to rotate in independent directions and the total refraction angle of the three or more prism lenses can be controlled to be consistent with the deviation angle and the strabismus correction value, any configuration is possible.

[0177] Figure 26 FIG. is a schematic diagram showing visual training of the visual training device 100 when both eyes have esotropia according to an embodiment of the present invention. Figure 26 The visual training for correcting esotropia when the user wears prism glasses is shown. In Figure 26 , 131a, 132a, 131b and 132b represent prism lenses, and the part corresponding to the arrow head represents the base. The user's both eyes have substantially the same deviation angle, and the prism diopters provided by the two prism assemblies (131a, 132a, 131b and 132b) have prism diopters associated with the user's deviation angle to improve the user's strabismus. When the visual training unit 151B performs visual training, the two prism assemblies (131a, 132a, 131b and 132b) included in the refraction angle adjustment unit 154 are based on the visual training information and at least one or a combination of the deviation angle information, strabismus correction value information, deviation direction information and fusion state information included in the visual training information, in accordance with Figure 26(a), the order of (1), (2), (3), (4), and (5) changes the refraction angle. Preferably, while controlling each pair of prism lenses (131a and 132a, and 131b and 132b) to rotate in different directions to correct different deviation angles, so that the prism diopter is changed to at least one or more corrective prism diopters included in the training range. Therefore, the user's gaze moves in a substantially linear manner in the order of (1), (2), (3), (4), and (5), as Figure 26 shown in (b).

[0178] The Figure 26 prism diopters corresponding to (2) to (4) in (a) and (b) are less than the deviation angle ( Figure 20 PD12 in) and greater than the separation point ( Figure 20 PD20 in). By repeatedly performing Figure 26 the operations of (1) to (5) in (a) and (b), the weak muscles that are the root cause of esotropia can be strengthened.

[0179] Figure 27 FIG. is a schematic diagram showing visual training of the visual training device 100 according to an embodiment of the present invention when both eyes have exotropia and the exotropia degrees of the right eye and the left eye, that is, the deviation angles, are different. Figure 26 FIG. shows visual training for correcting esotropia when the user wears prism glasses. For example, in Figure 26 , it is assumed that the deviation angle of the left eye is 10 PD and the deviation angle of the right eye is 2 PD. In Figure 26 , 131a, 132a, 131b, and 132b represent prism lenses, and the part corresponding to the arrow head represents the base. The prism diopters provided by the two prism assemblies (131a, 132a, 131b, and 132b) have prism diopters associated with the user's deviation angle to improve the user's strabismus. When the visual training unit 151B performs visual training, the two prism assemblies (131a, 132a, 131b, and 132b) included in the refraction angle adjustment unit 154 are based on the visual training information and at least one or a combination of the deviation angle information, strabismus correction value information, deviation direction information, and fusion state information included in the visual training information, in the order of Figure 27 (1), (2), (3), (4), and (5) in (a) to change the refraction angle. Preferably, while controlling each pair of prism lenses (131a and 132a, and 131b and 132b) to rotate in different directions, so that the prism diopter is changed to at least one or more corrective prism diopters included in the training range. Therefore, the user's gaze moves in a substantially linear manner in the order of (1), (2), (3), (4), and (5), as Figure 27(as shown in (b)). Since the two eyes have different deviation angles, the difference in the rotation amounts of a pair of two prism lenses that rotate in opposite directions included in the prism assembly is different from the difference in the rotation amounts of another pair of two prism lenses that rotate in opposite directions included in the prism assembly, as Figure 27 (shown in (2) to (4) of (a) and (b)). That is, the difference in the rotation amounts of two prism lenses 131a and 132a that rotate in opposite directions is different from the difference in the rotation amounts of two prism lenses 131b and 132b that rotate in opposite directions.

[0180] and Figure 27 the prism diopters corresponding to (2) to (4) of (a) and (b) are less than the deviation angle ( Figure 20 PD12 in Figure 20 ) and greater than the separation point ( Figure 27 PD20 in

[0181] Figure 14 FIG. is a diagram showing a visual training device in a corrected eye state of a user wearing prism glasses according to an embodiment of the present invention.

[0182] Referring to Figure 14 , the visual training device 100 according to an embodiment of the present invention includes a receiving portion (not shown) that can accommodate prism glasses (170), and the prism glasses are designed according to the user's eye conditions (visual acuity, degree of strabismus, etc.) and the required design. The visual training device 100 according to an embodiment of the present invention includes protective lenses 180 and 190 before and after the prism lenses 131a and 132a included in the refraction angle adjustment unit 154 to protect the prism lenses 131a and 132a from external impacts or dust.

[0183] As Figure 14 shown, the arrangement can be in the order of the eye, the prism glasses 170, the protective lens 180, the prism lenses 131a and 132a, and the protective lens 190. The distance D1 between the eye and the vertex of the prism glasses 170 can be, for example, 13 mm. The distance D2 between the eye and the protective lens 180 can be, for example, 15 mm to 20 mm. The distance D3 between the protective lens 180 and the protective lens 190 is preferably designed to be as narrow as possible because as the distance D3 decreases, the field of view is wider.

[0184] The visual training device 100 according to an embodiment of the present invention enables the user to perform visual training in both corrected and uncorrected eye states as described above.

[0185] Figure 15FIG. is a diagram depicting a vision training device 200 with an augmented reality (AR) function according to another embodiment of the present invention. As Figure 15 shown, the vision training device 200 may include image source units 500a and 500b that output augmented reality images and reflection units 400a and 400b. Describing the left-eye side, the light beam output from the image source unit 500a may pass through the left first prism lens 131a and the left second prism lens 132a, and then enter the reflection unit 400a. The light beam entering the reflection unit 400a may be reflected within the reflection unit 400a and then enter the user's left eye. The same method may also be applicable to the right-eye side. The control unit 151 controls the prism assemblies (131a, 132a, 131b, and 132b) to change the refraction angle of the light entering the user's eyes, such that the light entering the user's eyes is parallel to the gaze direction of the user's eyes, and changes the refraction angle of the light according to the vision training information during vision training to guide the movement of the user's eyes. Figure 15 The specific operations and vision training method of the vision training device 200 according to another embodiment of the present invention shown in

[0186] are substantially the same as the specific operations and vision training method of the vision training device 100 according to the embodiment of the present invention, and thus the description thereof is omitted. Figure 15 As a modification of the vision training device 200 according to another embodiment of the present invention shown in

[0187] Figure 16 FIG. is a diagram depicting a vision training device 300 with a virtual reality (VR) function according to another embodiment of the present invention. As Figure 16 shown, display units 310 and 320 corresponding to both eyes are configured to move the position of the displayed image under the control of the control unit 330, thereby guiding the movement of the user's eyes during vision training.

[0188] A storage unit (not shown) stores fusion state information such as SF interval, FF interval, skew angle (or strabismus range), recovery point and separation point, skew direction, strabismus correction value, training range, eye movement range, etc. in association with pixel coordinates.

[0189] The control unit 330 controls the display units 310 and 320 to display an image at pixel coordinates associated with the user's deviation angle, pixel coordinates associated with the diopter of at least one or more correction prisms, etc. based on the fusion adaptation time, thereby guiding the movement of the user's eyes. The control unit 330 causes the image to be displayed at the associated pixel coordinates based on at least one or more of or a combination of the deviation angle information, deviation direction information, strabismus correction value, and visual training degree, thereby guiding the movement of the user's eyes during visual training. The visual training device 300 with VR function according to another embodiment of the present invention performs operations and visual training methods similar to those of the visual training device 100 according to the embodiment of the present invention.

[0190] Next, a visual training method according to an embodiment of the present invention will be described with reference to Figure 17 FIG. Figure 17 is a flowchart showing a visual training method according to an embodiment of the present invention.

[0191] First, while changing the prism diopter at intervals of a predetermined unit (e.g., 0.5 PD unit or 1 PD unit), the deviation angle determination unit 156 measures the fusion adaptation time at each prism diopter and detects the fusion state information of the user's eyes (S110).

[0192] The fusion state information includes at least one or more or a combination of the SF start point, separation point, recovery point, SF interval, and FF interval of the eyes.

[0193] Then, the deviation angle information and deviation direction information are obtained by the deviation angle determination unit 156 (S120). A strabismus correction value including the correction direction and at least one or more prism diopters is determined based on the deviation angle information and deviation direction information (S130).

[0194] Then, based on the fusion state information and the strabismus correction value, a training range including at least one or more prism diopters is determined (S140), and based on the fusion adaptation time and at least one or more prism diopters included in the training range, the speed (training speed) or time for changing the prism diopter to each correction prism diopter is determined, and the training time is determined (S150).

[0195] Then, according to the training speed, the prism diopter is changed to at least one or more correction prism diopters included in the training range in a reciprocating, sequential, or repetitive manner, and the refraction angle of the light entering the user's eyes is changed by the refraction angle adjustment unit 154 to guide the user's eyes to move in a direction different from the deviation direction (preferably the opposite direction), thereby strengthening the weak eye muscles causing strabismus (S160).

[0196] Meanwhile, the disclosed visual training method can be implemented in the form of a recording medium storing computer-executable instructions. These instructions can be stored in the form of program code and, when executed by a processor, can generate program modules to perform the operations of the disclosed embodiments. The recording medium can be implemented as a computer-readable recording medium.

[0197] The computer-readable recording medium includes all types of recording media storing instructions that can be decoded by a computer. Examples of computer-readable recording media include read-only memory (ROM), random access memory (RAM), magnetic tapes, magnetic disks, flash memories, and optical data storage devices.

[0198] As described above, the disclosed embodiments have been described with reference to the accompanying drawings. Those skilled in the art to which the present invention pertains will understand that the present invention can be implemented in other forms without changing the technical spirit or essential features of the present invention. The disclosed embodiments are illustrative and should not be construed as restrictive.

Claims

1. A visual training device, include: a storage unit storing a user's deflection angle; as well as A control unit guides movement of the user's eyes based on the deflection angle.

2. The visual training device according to claim 1, in, The control unit comprises: a strabismus correction value determination unit that determines a strabismus correction value based on the deflection angle, and A vision training unit sets a training range based on the strabismus correction value and guides movement of the user's eyes based on the training range.

3. The visual training device according to claim 2, in: The storage unit stores information indicating the deflection direction, The strabismus correction value includes a correction direction opposite to the deflection direction and at least one or more corrective prism diopters smaller than the deflection angle, and The training range includes at least one or more of the at least one or more corrective prismatic powers.

4. The visual training device according to claim 3, in, The training range includes an interval in which fusion is performed relatively quickly and an interval in which fusion is performed relatively slowly.

5. A visual training device, include: a storage unit storing information indicating a deviation of an eye of a user and at least one or more pieces of correction information for correcting the deviation of the eye of the user; as well as A control unit guides the user's eyes to move in a direction different from the direction of the deflection based on at least one of the at least one or more correction information.

6. The vision training device according to claim 5, in, The at least one or more pieces of correction information differ in time required for fusion of the two eyes.

7. The vision training device according to claim 6, in, The at least one or more pieces of correction information guide the user's eyes to move in a direction opposite to the direction of the deflection.

8. The vision training device according to claim 7, in, The at least one or more pieces of correction information are at least one or more prism diopters.

9. The vision training device according to claim 8, in, The at least one or more prismatic diopters include at least one or more of a prismatic diopter associated with a deflection angle of the user's eyes, a prismatic diopter that is smaller than the deflection angle and is minimum for achieving fusion of the user's eyes, and a prismatic diopter that is smaller than the deflection angle and greater than the minimum prismatic diopter, or a combination thereof.

10. The vision training device according to claim 9, in, The prism power that is smaller than the deviation angle and greater than the minimum prism power is the prism power that changes diplopia into single vision.

11. A visual training method, include: measuring a fusion adaptation time for each of a plurality of refraction angles less than a deflection angle of an eye of the user; Based on the fusion adaptation time, determining a training time for changing the refraction angle to the multiple refraction angles; determining at least one or more of the plurality of refraction angles as a training range; and The refraction angle is changed to at least one or more refraction angles included in the training range according to the training time to guide the movement of the user's eyes.

12. The visual training method according to claim 11, in, The at least one or more refraction angles included in the training range include a refraction angle at which diplopia changes to monovision.

13. The visual training method according to claim 12, in, The at least one or more refraction angles included in the training range include a minimum refraction angle for binocular fusion.

14. The visual training method according to claim 13, in, The at least one or more refraction angles included in the training range include a deflection angle of the user's eyes.

15. The visual training method according to claim 14, in, The fusion adaptation times required to achieve binocular functions measured for the plurality of refraction angles are different from each other.

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