System for measuring clinical parameters of visual function

Abstract

A measurement system includes a first display unit (20) configured to represent a scene in which at least one two-dimensional / three-dimensional object has variable features to impart a visual response to a user, wherein the variable features include at least the virtual position and virtual volume of the two-dimensional / three-dimensional object within the scene; an interface (30) configured to enable user interaction; a processing device (42, 44) configured to analyze the user response and estimate multiple clinical parameters of the user's visual function based on the correlation of data from the interface (30) and the variable features of the two-dimensional / three-dimensional object represented in the display unit (20); and a second display unit (50) further configured to represent a scene in which the at least one two-dimensional / three-dimensional object has variable features to impart a visual response to a user.

Description

Technical Field

[0001] This invention relates to a system for measuring clinical parameters of visual function. Background Technology

[0002] Currently, the measurement of clinical parameters of visual function requires clinical experts to perform a series of tests and visual acuity tests on patients during treatment. The personal and manual aspects of the measurements often provide subjective, poorly reproducible, and purely qualitative results.

[0003] Currently, the clinical stimulation of accommodation in optometry is performed manually by experts. The stimulus is placed on a piece of paper or other object to make the eye focus the image on the retina on different planes, or by using different negative or positive lenses on the eye to change the focus of the object.

[0004] On the other hand, measurements are performed independently of the visual function being assessed. This means that results are sometimes invalid because the influence of other factors is underestimated. For example, it is well known that patients tend to compensate for specific abnormalities or deficits in visual function by compensating for them with overall function in the rest of the body.

[0005] In short, current methods do not take into account the patient's adaptability, so actions designed to detect or correct specific abnormalities may lead to an overall deterioration in the patient's vision. Furthermore, the measurements and tests performed on patients are influenced by the subjectivity of the experts performing them, which significantly limits the reproducibility and consistency of the experimental results obtained.

[0006] WO2018087408 A1, with the same applicant as this application, describes a system for measuring clinical parameters of visual function, including a display unit comprising a single screen configured to represent a scene in which at least one three-dimensional object has variable features to impart a visual response to a user.

[0007] In addition, the system described in this document includes multiple motion sensors configured to detect the user's head position and distance to the display unit; and multiple tracking sensors configured to detect the position and diameter of the user's pupils.

[0008] The system described in this document provides a system for comprehensively measuring ocular, oculomotor, and visual function parameters, preferably in real time, and for generating training that improves visual function.

[0009] However, without the use of ophthalmic lenses, the use of a single display limits the stimulation and measurement of the response of the visual function's accommodation (focusing) system in open or closed fields of vision at different distances. Summary of the Invention

[0010] Therefore, one object of the present invention is to provide a system for measuring clinical parameters of visual function, the system allowing for the establishment of stimuli (controlled or uncontrolled) and precise measurement of accommodative responses, which allows for such stimulation independent of the binocular visual system.

[0011] The above-mentioned disadvantages are resolved by using the measurement system of the present invention, and other advantages will be presented as described below.

[0012] The system for measuring clinical parameters of visual function according to the present invention includes: a first display unit configured to represent a scene, wherein at least one two-dimensional (2D) / three-dimensional (3D) object has variable features to impart a visual response to a user, wherein the variable features include at least the virtual position and virtual volume of the two-dimensional / three-dimensional object within the scene;

[0013] An interface is configured to allow users to interact within the scenario;

[0014] A processing device configured to analyze user responses and estimate multiple clinical parameters of the user's visual function based on the correlation of data from the interface and the changes in features of the two-dimensional / three-dimensional object represented on the display unit, wherein the system further includes: a second display unit configured to represent a scene in which at least one 2D / 3D object has variable features to impart a visual response to the user.

[0015] For example, such variable features may include at least the virtual position and virtual volume of 2D / 3D objects in the scene.

[0016] Optionally, the system may further include:

[0017] Multiple motion sensors are configured to detect the position of the user's head and its distance from the display unit;

[0018] Multiple tracking sensors are configured to detect the position and diameter of the user's pupils;

[0019] Preferably, according to a possible embodiment, the second display unit is smaller than the first display unit, although it can also be larger. For example, the second display unit could be a 5" screen.

[0020] Furthermore, the second display unit is movable relative to the first display unit. This movement of the second display unit allows for the presentation of stimuli at different distances, thereby generating controlled stimulation of the accommodation system and obtaining objective measurements of eye responses and patient responses.

[0021] The measurement system according to the invention may also advantageously include a support on which the first display unit is mounted, the support being slidable along a body, and the second display unit being mounted on an arm rotatably connected to the body.

[0022] Furthermore, the main body advantageously includes a motor that drives the rotational movement of the second display unit.

[0023] On the other hand, according to a preferred embodiment, the support is fixed by a slider that moves along at least one longitudinal bar of the body.

[0024] The following advantages can be achieved by using the measurement system according to the present invention:

[0025] Present the stimulus at a controlled distance from the patient;

[0026] Controlled jumps are executed to the distance between the main display unit and the user.

[0027] The distance between the main unit and the user is gradually and in a controlled manner.

[0028] Synchronization and / or compliant stimulation are performed between two display units or a third system containing 2D / 3D objects (e.g., a third monitor at another distance);

[0029] Use 2D / 3D objects to assess accommodation, binocular vision, and eye movements at different distances;

[0030] Training accommodative visual function, binocular vision, and eye movements using 2D / 3D objects at different distances; and

[0031] Assess and train other neural functions with or without visual impairment that require the presentation of objects at different distances. Attached Figure Description

[0032] To better understand the content already explained above, some accompanying drawings are included, which schematically and only as non-limiting examples illustrate actual embodiments.

[0033] Figure 1 This is a block diagram of the components constituting a system for measuring clinical parameters of visual function according to the present invention; and

[0034] Figure 2 This is a schematic side view of a system for measuring clinical parameters of visual function according to the present invention. Detailed Implementation

[0035] like Figure 1As shown, according to the presented embodiment, the measurement system according to the invention includes a tracking sensor 10 for periodically detecting the position of the user's pupils. Therefore, not only changes in direction can be measured, but also speed. Furthermore, the measurement system also includes a motion sensor 60, which detects the movement of the user's head when using the measurement system.

[0036] Typically, the tracking sensor 10 allows for the measurement of multiple parameters over a specific period of time. For example, the tracking sensor 10 can acquire values ​​for the positions of the left and right eyes, the position of the object the user is looking at (through both eyes and apart), eye sensor distance, pupil size, interpupillary distance, eye movement speed, etc.

[0037] Typically, for measurement purposes, the tracking sensor 10 includes a pair of cameras focused on the user's eyes and capturing their movement and position. This requires a sufficiently high sampling rate to capture rapid eye movements. It must also calculate the location the user is looking at within the generated virtual environment.

[0038] The measurement system according to the invention also includes a first display unit 20 having a two-dimensional (2D) / three-dimensional (3D) immersive capability, which uses 2D / 3D objects with predetermined properties to reproduce or project the depth of a user scene.

[0039] These scenes with 2D / 3D objects serve as visual functional stimuli and can be selected within the system based on the operation to be performed, thereby stimulating certain visual challenges for the user. Therefore, a large number of scenes with different challenges and visual stimuli can be designed for users for the assessment and training of visual and / or neural functions.

[0040] The system also includes an interface 30 for user interaction. Specifically, this interface receives commands from the user to control the first display unit 20 and other components of the system. The interface 30 assists the user with visual challenges. Therefore, the system can measure responses to actions performed by the user in different ways, all controlled by a central system.

[0041] The system also includes a processing device 40, preferably implemented as a server 42 and a terminal 44, which coordinately shares the management of the first display unit 20, the control of the sensor 10, and the interface 30, enabling the sensor 10 to detect a response and send the response to the server 42 for measuring clinical parameters of visual function. Furthermore, the first display unit 20 allows adaptation to motion-related clinical 3D images. The display unit 20 may include a dissociating system (e.g., polarized glasses).

[0042] During visualization of visual challenges created using specific clinical 3D, these visual challenges are measured using tracking sensor 10 and correlated with challenges in the second display unit.

[0043] These changes in the user's pupil position are detected and combined with the user's head movements detected by the motion sensor 60. The coupling between the motion sensor 60 and the first display unit 20 allows the display of 3D images adapted to the person's movement or position, giving the user the feeling of moving within the viewed virtual environment, i.e., a sense of immersion.

[0044] The data is processed, and the properties of the 2D / 3D objects are correlated with the triggered objects detected by sensors 10 and 60. This allows clinical parameters of visual function to be measured under repeatable and controlled conditions. Parameters required for regulating visual function are measured.

[0045] As shown in the figure, while displaying 2D / 3D objects on the first display unit 20, the tracking sensor 10 records:

[0046] The position of the eyes (left and right sides);

[0047] The position each eye is looking at (respectively); and

[0048] In a 2D / 3D environment, the user combines the positions of their eyes when viewing.

[0049] Simultaneously, instructions can be displayed to guide the user by explaining what to do at any given moment. These instructions can be in the form of text, video, or audio instructions via an interface 30. The interface 30 also allows the user to interact with 2D / 3D objects in the scene represented by the first display unit 20.

[0050] For example, these user responses can take the following forms:

[0051] Move in front of the device (in any direction in space);

[0052] The location of the device within an open area of ​​a virtual reality / augmented reality environment;

[0053] Pressure on the device button; and

[0054] Voice commands.

[0055] In the above situation, for the above task, it is preferable to perform the processing on a client terminal 44, even if it is provided from an external server 42.

[0056] In addition, different features can be sent from the server 42, such as a virtual / augmented reality environment or other environments to be used.

[0057] The data to be collected includes data from sensors 10 and 60, as well as data generated through user interaction with the interface 30.

[0058] Once all local processing of the data is complete, they are grouped and sent to server 42 for storage and subsequent analysis.

[0059] For example, the values ​​obtained for certain parameters can be checked against tolerances based on scientific research stored in the server 42. On the other hand, as a recommendation, new scenarios can be designed for use in treatment or training to improve some functionalities.

[0060] According to the invention, the measurement system further includes a second display unit 50, which is preferably a smaller display than the first display unit 20, although it can be larger. The second display unit 50 is also configured to present a scene in which at least one 2D / 3D object has variable features to induce a visual response in a user, wherein the variable features include at least the virtual position and virtual volume of the 2D / 3D object in the scene.

[0061] The first display unit 20 and the second display unit 50 are mounted on a main body 51 and 52.

[0062] Specifically, the first display unit 50 is mounted on a support member 51, which is integrally connected to a slider 56, which moves along the body 52 via one or more rods 55.

[0063] In its own right, according to the illustrated embodiment, the second display unit 50 is mounted on an arm 53, which is hinged to the body 52, such that the display unit 50 is swayable and can move relative to the first display unit 20.

[0064] However, it should be noted that the second display unit 50 can be moved relative to the first display unit 20 in any suitable manner, such as vertically.

[0065] The movement of the second display unit 50 and / or the first display unit 20 is driven by any suitable device, for example, by a motor 54.

[0066] In addition, such as Figure 2 As shown, a housing 57 can be mounted on the support 51, which houses an additional power supply and / or electronic components for the proper operation of the measurement system.

[0067] The use of two display units 20 and 50 allows for changes in the viewing plane, focus, and visual adjustment.

[0068] Although specific embodiments of the invention have been referenced, it will be apparent to those skilled in the art that the described measurement system is susceptible to various changes and modifications, and that all the details mentioned may be replaced by other technically equivalent details without departing from the scope of protection defined by the appended claims.

Claims

1. A system for measuring clinical parameters of visual function, characterized in that, The system includes: A first display (20) is configured to represent a first scene, the first scene including at least one first object, wherein the at least one first object has a plurality of variable features to instill a visual response to a user, wherein the plurality of variable features includes at least a virtual position or virtual volume of the first object within the first scene. An interface (30) is configured to allow the user to interact in the first scenario; A processor (42, 44) is configured to analyze user responses and an estimate of multiple clinical parameters of the user’s visual function based on the correlation of data from the interface (30) with changes in multiple features of the first object represented on the first display (20). A second display (50) configured to represent a second scene, wherein at least one second object has a plurality of variable features to impart a visual response to the user; and The system also includes a body (52) which includes an arm (53). The first display (20) is mounted on a support (51) that is slidable along the body (52) to adjust the distance between the user and the first display (20). The first display (20) and the second display (50) allow the user to change their viewing plane, focus, and visual adjustment. The first display (20) is mounted on the body (52), and the second display (50) is mounted on the arm (53), which is rotatably connected to the body (52) such that the second display (50) is movable relative to the first display (20) to present stimuli at different physical distances.

2. System for measuring clinical parameters of visual function according to claim 1, characterized in that: The second display (50) is smaller or larger than the first display (20).

3. The system for measuring clinical parameters of visual function according to claim 1, characterized in that: The main body (52) includes a motor (54) that drives the rotation of the second display (50).

4. The system for measuring clinical parameters of visual function according to claim 1, characterized in that: The support (51) is integrally formed with a slider (56), which moves along at least one longitudinal rod (55) of the body (52).

5. The system for measuring clinical parameters of visual function according to claim 1, characterized in that: The visual function of the clinical parameter refers to at least one of the following: binocular, accommodation, eye movement, reading ability, or visual perception.

6. The system for measuring clinical parameters of visual function according to claim 1, characterized in that: The system also includes: Multiple motion sensors (60) are configured to detect the position of the user's head and its distance from the first display (20); and Multiple tracking sensors (10) are configured to detect the position and diameter of the user's pupil.

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