System for assessing light-induced discomfort and associated method

Abstract

A system (3) for assessing light-induced discomfort of a user, the system (3) comprising a sensor (9) for measuring the conductance of a skin surface of the user, the system (3) being configured to:-obtain, by means of the sensor (9), at least one measurement of the conductance of the skin surface of the user, -obtaining at least one value of at least one parameter representative of the at least one measurement of the conductance, and-comparing the at least one value of the at least one parameter with at least one reference value and detecting a light-induced discomfort of the user based on the comparison.

Description

TECHNICAL FIELD

[0001] The present invention relates to the field of assessing and mitigating photic discomfort.

[0002] More particularly, the present invention relates to a system for assessing photic discomfort of a user.

[0003] The present invention also relates to a computer-implemented method implemented by the system. BACKGROUND

[0004] The impact of ambient light on stress and health is a previously observed and highly relevant issue in the field of optical devices and other light-related applications such as light therapy. Both light exposure in short duration and light exposure throughout the day affect health, and an effective management of this impact can be a key parameter to improve health.

[0005] Exposure to varying amounts of light can also have an impact on alertness and emotional state, with studies showing variations in response time and response accuracy to simple questions based on the light exposure of the subjects.

[0006] It is therefore of interest to identify optimal light conditions to improve alertness and / or comfort, to mitigate stress, and to make recommendations to adjust light exposure, for example using tinted lenses.

[0007] However, since most studies to date rely on qualitative observations to determine the comfort level of the tested subjects, it is difficult to analyze these impacts precisely and in a quantitative manner. Feedback on discomfort can be obtained through questionnaires or through specific devices that require the input of the user to detect discomfort.

[0008] However, internal studies carried out by the applicant have shown that subjective assessment of light sensitivity based on illuminance levels lacks reproducibility and presents age differences, for example older people tend to indicate less often that they are sensitive. In addition, questionnaires and guidelines for providing user input can be difficult for tested subjects to understand, since there is no universally accepted definition of photic discomfort. In addition to this, the perception of photic discomfort varies over time, which can be difficult to take into account with respect to instantaneous illuminance measurements.

[0009] Furthermore, integrating this type of observation into an automated device or program would require active participation of the user and thus greatly reduces the benefits of automation.

[0010] There is therefore a need for a system for assessing photic discomfort of a user in a precise and quantitative manner without relying on direct input from the user and issuing recommendations and / or commands based on the detected discomfort. SUMMARY

[0011] To this end, the application relates to a system for evaluating a photodiscomfort of a user, the system comprising a sensor for measuring an electrical conductance of a skin surface of the user, the system being configured for:

[0012] - obtaining at least one measurement of the electrical conductance of the skin surface of the user by the sensor,

[0013] - obtaining at least one value of at least one parameter representative of the at least one measurement of the electrical conductance, and

[0014] - comparing the at least one value of the at least one parameter with at least one reference value, and detecting a photodiscomfort of the user based on the comparison.

[0015] Such a system allows a quantitative measurement of a physiological parameter, enabling the detection of a possible photodiscomfort of the wearer.

[0016] According to an embodiment, the at least one parameter can comprise a spike frequency of the measured electrical conductance, a spike amplitude of the measured electrical conductance, and / or a delay between spikes of the measured electrical conductance.

[0017] Such parameters have been proven to be correlated with the discomfort experienced by the user and can be easily determined by numerical processing by the control module, in order to be easily implemented in the control method.

[0018] According to another embodiment, the system can comprise a notification module configured to emit a notification to the user through an interface and / or through an external electronic device, the system being further configured for:

[0019] - emitting a notification of the detection of a photodiscomfort of the user, and optionally, a suggestion to adjust or replace the optical element worn by the user.

[0020] Such a feature allows to alert the user of the detected photodiscomfort, so that a correction can be implemented.

[0021] According to another embodiment, the system can comprise a communication module configured to communicate with at least one controllable optical element worn by the user presenting a variable optical function, the system being further configured for:

[0022] - emitting a command to the controllable optical element for modifying the variable optical function of the controllable optical element, in order to mitigate the detected photodiscomfort of the user.

[0023] Such a feature allows to automatically respond to the discomfort perceived by the user by changing the optical function of the optical element to mitigate said discomfort.

[0024] According to another embodiment, the controllable optical element may be a dimming element, and the commands for modifying the optical function include: adjusting the transmittance value of the dimming element, and / or the polarization value of the dimming element, and / or the transition speed between at least two states of the dimming element.

[0025] This feature allows for automatic adjustment of dimming element transitions to reduce perceived stress on the user without requiring user input.

[0026] According to another embodiment, the system may include a communication module configured to communicate with a light therapy device being used by the user, and the system is further configured to:

[0027] - Issue a command to the light therapy device to adjust the settings of the light therapy device in order to alleviate the detected light-induced discomfort of the user.

[0028] This feature allows for automatic control of light therapy devices to adjust parameters (such as color and intensity) to minimize user discomfort without requiring user input.

[0029] According to another embodiment, the sensor may be arranged in the frame of a head-mounted device or in an external device worn by the user in a manner that makes contact with the user's skin surface.

[0030] This feature allows for continuous measurement of conductivity in a portable and convenient manner during the use of the system.

[0031] According to another embodiment, the system may further include at least one sensor for determining the amount of ambient light, and the system is also configured to:

[0032] - Compare the amount of ambient light with a predetermined ambient light threshold.

[0033] - It also detects light-induced discomfort based on a comparison of the amount of ambient light with a predetermined ambient light threshold.

[0034] This feature allows for the automatic detection of excessive light that may cause perceived discomfort, thereby reducing the risk of erroneously detecting discomfort caused by another source.

[0035] According to another embodiment, the system may further include at least one position and / or motion sensor, and the system is also configured to:

[0036] - Obtain the value of at least one activity parameter representing the user's position and / or movement through the at least one position and / or motion sensor.

[0037] - The activity-induced pressure level is determined based on the value of at least one activity parameter, and

[0038] - Adjust the reference values ​​based on the determined activity-induced stress level.

[0039] This feature allows the nature and level of the activity the user is performing to prevent false alarms when detecting photo-induced stress.

[0040] According to another embodiment, the system may further include at least one physiological sensor configured to obtain the value of at least one physiological parameter of the user, and the system is also configured to:

[0041] - The value of at least one physiological parameter of the user is obtained through at least one physiological sensor.

[0042] - The physiological stress level is determined based on the value of at least one physiological parameter, and

[0043] - Adjust the reference values ​​based on the determined physiological stress level.

[0044] This feature allows for the use of additional parameters when determining a user's stress level, improving the accuracy of stress detection. These physiological parameters could be, for example, heart rate, blood pressure, skin temperature, or even electrical activity in brain regions.

[0045] According to another embodiment, the reference value may be specifically determined for the user during the initial calibration process.

[0046] This feature allows for consideration of individual differences in sensitivity to photoinduced stress and differences in response to changes in skin conductance.

[0047] According to another embodiment, the system may further include a computing module, which includes at least one processor and at least one memory.

[0048] The present invention also relates to a head-mounted device comprising a frame, at least one optical element, and a system for assessing a user's photosensitivity, the system including a sensor for measuring the electrical conductivity of the user's skin surface, the system being configured to:

[0049] - The sensor obtains measurements of the electrical conductivity on the user's skin surface.

[0050] - Obtain at least one value representing at least one parameter of the measured conductance, and

[0051] - The at least one value of the at least one parameter is compared with at least one reference value, and the user's photo-induced discomfort is detected based on the comparison.

[0052] The present invention further relates to eyeglasses comprising a frame, at least one optical element, and a system for assessing a user's photosensitivity, the system including a sensor for measuring the electrical conductivity of the user's skin surface, the system being configured to:

[0053] - The sensor obtains measurements of the electrical conductivity on the user's skin surface.

[0054] - Obtain at least one value representing at least one parameter of the measured conductance, and

[0055] - The at least one value of the at least one parameter is compared with at least one reference value, and the user's photo-induced discomfort is detected based on the comparison.

[0056] The present invention also relates to a computer-implemented assessment method for evaluating a user's photosensitive discomfort, the assessment method comprising:

[0057] - The sensor obtains measurements of the electrical conductivity on the user's skin surface.

[0058] - Obtain at least one value representing at least one parameter of the measured conductance, and

[0059] - The at least one value of the at least one parameter is compared with at least one reference value, and the user's photo-induced discomfort is detected based on the comparison. Attached Figure Description

[0060] Figure 1 This is a schematic representation of a head-mounted device including the system according to the invention.

[0061] Figure 2 yes Figure 1 A graphical representation of the skin conductance measured by the system's users.

[0062] Figure 3 This is a schematic representation of a system according to another embodiment of the present invention.

[0063] Figure 4 This is a schematic representation of a system according to a third embodiment of the present invention, and

[0064] Figure 5 This is a representation of the evaluation method according to the present invention. Detailed Implementation

[0065] The following text is for reference only. Figure 1 The first embodiment of the present invention is described.

[0066] In this embodiment, the system 3 for assessing photo-induced discomfort according to the present invention is installed in a location generally designated as Figure 1The smart glasses type head-mounted device 1 shown.

[0067] Such a head-mounted device 1 typically includes a rigid frame 2, which comprises a single component or multiple hinged components, arranged to be worn on the wearer's face by being supported on at least one facial feature (such as the nose and / or ears).

[0068] In this embodiment, the entire system 3 is installed in the device 1 and includes an electronic computing module 5, at least one optical element 7, and at least one sensor 9 configured to measure the electrical conductivity of the wearer's skin surface.

[0069] The computing module 5 includes electronic circuitry, which includes at least one processor 5a for executing a program and a memory 5b for storing data and instructions for executing the program.

[0070] In the described example, optical element 7 is an optical lens mounted on head-mounted device 1.

[0071] Optical element 7 may be an ophthalmic lens that provides ophthalmic correction to the user. Alternatively, optical element 7 may be a plano lens that does not provide ophthalmic correction.

[0072] Ophthalmic lenses or plano lenses can also be shaped to modify the intensity of light passing through the lens, such as tinted absorbing lenses or sunglasses with a transmittance gradient.

[0073] Alternatively, optical element 7 may have at least one variable optical function, such as a variable transmittance lens.

[0074] The variable optical function can change automatically (e.g., when exposed to incident light) or it can be guided (e.g., under the control of computing module 5).

[0075] For example, such as Figure 1 As shown, the optical element 7 can be a dimming element, such as an electrochromic lens including an electrochromic element and a control module 8.

[0076] The dimming element can preferably switch between at least two states in a controlled manner, and the variable optical function takes different values ​​in the different states of the dimming element.

[0077] Variable optics features can be variable hue levels and / or variable polarization of the dimming element.

[0078] The control module 8 is configured to modify the current value of the variable optical function under the control of the calculation module 5, for example, by applying control tension derived from commands received from the calculation module 5 to the dimming element.

[0079] In addition, system 3 can be configured to adjust the desired value of the optical function (such as the desired hue level), as well as the transition speed from the current value of the optical function to the desired value and the transition speed between two different states of the dimming element.

[0080] Sensor 9 is, for example, a contact sensor, which must be positioned to contact the skin area to allow for accurate measurements. Therefore, sensor 9 is mounted on the smart glasses to contact the skin area when the glasses are worn, for example, in… Figure 1 In the example shown, the support leg 10 is mounted in the frame to contact the user's temple, or it is mounted between the lenses to contact the bridge of the nose.

[0081] Alternatively, sensor 9 can be mounted on an external device worn in contact with the user's skin, such as a wristband or watch, anklet, belt, headband, etc. In this case, sensor 9 communicates with the control module via a direct or wireless connection.

[0082] System 3 is configured to obtain at least one measurement of the electrical conductivity of the user's skin surface via sensor 9, and derive at least one value representing at least one parameter of the measured electrical conductivity.

[0083] Figure 2 It is the electrical conductivity EDA (in micro Siemens) of the user's skin area. S) represents a graphical representation of an example record that varies over time, showing multiple spikes with varying frequencies and intensities.

[0084] Advantageously, the at least one parameter includes the peak frequency of the measured conductance, the peak amplitude of the measured conductance, and / or the delay between the peaks of the measured conductance.

[0085] Both the frequency and intensity of the spikes have been shown to be correlated with the user's elevated stress levels.

[0086] For example, the peak frequency of the measured conductance may be between 0.045 Hz and 0.25 Hz during normal activity, between 0.25 Hz and 0.28 Hz during moderate activity, and reach 0.37 Hz during intense activity.

[0087] System 3 is also configured to select at least one predetermined reference value of the at least one parameter from pre-recorded reference values ​​stored in memory 5b.

[0088] The selected reference values ​​are advantageously chosen based on the user’s specific preferences and / or on environmental and contextual characteristics.

[0089] System 3 is also configured to compare at least one value of the at least one parameter with the at least one reference value, and to detect photo-induced discomfort of the user based on the comparison.

[0090] For example, the reference value could be a threshold for peak intensity and / or peak frequency, which triggers the detection of user-perceived pressure when it is exceeded.

[0091] System 3 can be configured to determine reference values ​​specifically for the user during the initial calibration process.

[0092] The reference value is stored in memory and is advantageously user-specific, and is loaded when device 1 is turned on and the user's identity is confirmed.

[0093] The head-mounted device 1 may also include a communication device 11 or a communication interface for enabling communication between the head-mounted device and other electronic devices, such as computers, smartphones, or other components in the user's personal area network.

[0094] For example, the communication device 11 can function via a direct wired connection or via a wireless connection protocol such as "Wi-Fi" or "Bluetooth".

[0095] System 3 may include a notification module 6, which is configured to send notifications to the user via an interface and / or via an external electronic device using communication device 11.

[0096] The interface may include a visual interface, such as a screen or a light-emitting signaling device. Alternatively, the interface may include an audio interface for transmitting audio signals to a user or a vibration interface for transmitting acoustic signals.

[0097] System 3 can be configured to issue at least one notification to the user when the user perceives light-induced stress or discomfort, and to provide suggestions for alleviating the perceived stress. For example, System 3 could suggest adjusting the optical devices the user is using, such as wearing sunglasses, to reduce discomfort caused by excessive ambient light.

[0098] The notification module 6 can also be configured to notify eyewear practitioners to provide data for visual diagnosis of users and to adjust the optical devices used.

[0099] System 3 can also be configured to control at least one controllable optical element with variable optical functions worn by the user based on the detected photo-induced discomfort.

[0100] System 3 can be configured to control optical elements via direct connection or via communication device 11.

[0101] Then, system 3 is also configured to issue commands to controllable optical elements to modify variable optical functions in order to alleviate the light-induced discomfort of the detected user.

[0102] For example, in cases where discomfort is perceived due to high levels of ambient light, System 3 can reduce the transmittance value of the lenses worn by the user.

[0103] Alternatively, if the transmittance value changes too quickly or too slowly, the resulting perceived pressure can prompt a correction to the rate of change to alleviate discomfort.

[0104] This feature allows for the adaptation of dynamic characteristics of transitions when users are exposed to sudden and / or repeated transitions between bright and dark environments or between dark and bright environments.

[0105] System 3 may also include a light sensor 13 configured to measure the amount of ambient light around the user.

[0106] The light sensor 13 can be mounted on the head-mounted device 1 or an external device, and communicates with the computing module 3 via the communication device 11. Figure 1 In the example shown, the light sensor 13 is embedded in the frame 2 of the head-mounted device 1.

[0107] In this context, System 3 is configured to consider the measured ambient light level when determining potential photosensitivity and when deciding on recommendations to be given to the user. For example, high levels of ambient light are more likely to induce photosensitivity, while low levels of ambient light indicate that other stressors may be the cause of the perceived stress.

[0108] System 3 may further include at least one position and / or motion sensor 14, which is mounted on the head-mounted device 1, such as Figure 1 As shown, or installed on an external device.

[0109] The at least one motion sensor 14 may include at least one inertial motion sensor (also known as an IMU, representing an Inertial Motor Unit) for measuring linear acceleration (i.e., linear acceleration), a gyroscope sensor for measuring angular movement and angular position, a magnetic sensor for measuring orientation relative to a reference direction, and any sensor that measures information that may be related to movement or position.

[0110] The at least one sensor 14 may also include at least one forward-facing camera mounted on the head-mounted device 1, the at least one forward-facing camera being configured to acquire an image of the environment in front of the user and associated with an appropriate image processing algorithm to obtain the user's motion or activity level from the acquired image.

[0111] The at least one motion or position sensor 14 may also include a GPS unit configured to determine the user's location.

[0112] Then, the system 3 is configured to obtain the value of at least one activity parameter representing the user's position and / or movement through the at least one position and / or motion sensor 14, and determine the activity-induced pressure level based on the value of the at least one activity parameter.

[0113] Sensor 3 is then configured to adjust the selected reference value based on the determined activity-induced stress level. For example, based on the overall level of activity performed by the user, a high level of activity-induced stress will be associated with a higher threshold for detecting photosensitive discomfort.

[0114] exist Figure 3 In the second embodiment shown, system 3 includes several components mounted on an external device 15 (in this case, a wristband or smartwatch).

[0115] External device 15 is worn by a user of system 3, for example, and includes a communication module 17 configured to communicate with computing module 5 via communication module 11 of head-mounted device 1.

[0116] External device 15 can be configured to deliver notifications issued by notification module 6 to the user, for example, via an interface installed on external device 15.

[0117] The external device 15 may also include a sensor 19 for measuring skin conductivity in a second skin region of the user (e.g., on the wrist). The sensor 19 may supplement or replace the sensor 9 mounted on the head-mounted device 1.

[0118] The external device further includes a control module 21 configured to control the communication module 17 and the sensor 19 mounted on the external device 15.

[0119] System 3 may include at least one physiological sensor 23 configured to measure the value of at least one physiological parameter of the user. The physiological sensor 15 may be mounted on the head-mounted device 1 or on an external device 15 worn by the user, and communicates with the computing module 5 via a communication device 11, such as... Figure 3 As shown.

[0120] The at least one physiological sensor 23 may include a thermometer for measuring the user's skin temperature as a physiological parameter, a heart rate monitor and / or blood pressure monitor for measuring the user's heart rate and / or blood pressure as physiological parameters, and / or an electroencephalograph for measuring the level of electrical activity in a region of the user's brain as a physiological parameter.

[0121] The at least one physiological sensor 23 may also include an eye-tracking camera configured to acquire images of the wearer's eyes, and the computing module 3 is further configured to determine the user's squinting frequency based on the acquired images.

[0122] System 3 is further configured to analyze the measured value of the at least one physiological parameter, determine the user's physiological stress level based on the value of the at least one physiological parameter, and adjust the reference value based on the determined physiological stress level.

[0123] For example, high levels of physiological stress will increase the reference threshold required to detect photoinduced stress in order to compensate for irrelevant stress factors.

[0124] System 3 can also be configured to communicate with the light therapy or phototherapy device 25 that the user is using, such as... Figure 4 As shown, it issues a command to the light therapy device 25 to adjust the settings of the light therapy device in order to alleviate the detected light-induced discomfort of the user.

[0125] For example, the light intensity and / or spectrum of the light flux 27 emitted by the light therapy device 25 and received by the user can be adjusted to alleviate discomfort, and the illumination provided by the light therapy device 25 can be maintained as high as possible while remaining below the photo-induced discomfort threshold. This is particularly beneficial for light therapy or phototherapy treatments that require or benefit from prolonged exposure.

[0126] The following will refer to Figure 5 A computer-implemented evaluation method is described for assessing light-induced discomfort in users of System 3.

[0127] The evaluation method may include an initial calibration step (CAL) during which reference values ​​are determined specifically for the user of System 3.

[0128] The calibration step can be triggered manually or automatically (e.g., when system 3 is turned on).

[0129] During the calibration step, system 3 collects values ​​representing at least one parameter of the measured skin conductance obtained by the at least one sensor 9, as well as other values ​​obtained by other types of sensors present in system 3, such as ambient light level values ​​obtained by light sensor 13.

[0130] System 3 can also collect input from users, for example, to set thresholds corresponding to the discomfort experienced by the user.

[0131] The evaluation method includes the step MES: obtaining the measurement results of the electrical conductivity of the user's skin surface through sensor 9.

[0132] Conductivity measurements can be obtained continuously, periodically, or during specific predetermined recording phases. Measurements can also be triggered by predetermined external events (such as ambient light reaching a minimum threshold) and / or user commands.

[0133] The measured value of conductivity is stored in the memory 5b of the computing unit 5 for processing.

[0134] The evaluation method further includes the step PAR: obtaining at least one value of at least one parameter representing the measured conductance.

[0135] For example, the parameters could be the frequency of conductance spikes, the intensity of conductance spikes, and / or the number of conductance spikes. In this case, a spike indicates a sharp rise in conductance from the current baseline value, followed by a rapid exponential decline to return to the baseline value.

[0136] During this step, the calculation module 5 uses at least one data processing tool to process the measured conductance value stored in the memory 5b to obtain the value of the at least one parameter.

[0137] Numerical processing of the data may include correcting for artifacts in the measurement results (e.g., artifacts caused by user movement). Artifact detection is based on the shape of associated peaks in the conductance, which differ dynamically from the spikes described above.

[0138] Numerical processing may also include, for example, smoothing the curve using the Hann windowing algorithm.

[0139] Numerical processing may also include a sequential decomposition analysis, which is performed to separate the conductance into a temporal component and a stress component. The temporal component may include, for example, slow changes in the baseline level, while the stress component includes sharp changes, including spikes used to obtain the values ​​of the parameters.

[0140] Numerical processing can perform peak detection by applying a predetermined threshold to determine whether a change can be considered a peak. For example, the threshold might be set to 0.05. The minimum amplitude change of S.

[0141] The evaluation method may include step ACC: obtaining the value of at least one other parameter by means of measurements from at least one other sensor in system 3.

[0142] For example, the ambient light level can be obtained from the measurement results from the light sensor 13, the value of at least one physiological parameter can be obtained from the measurement results from the physiological sensor 15, and / or the value of at least one activity parameter can be obtained from the measurement results from the position and / or motion sensor 14.

[0143] The evaluation method may also include the step SEL: selecting at least one predetermined reference value for the at least one parameter. The selected reference value is determined based on pre-recorded user preferences, commands that may come from the user, and optionally values ​​of other parameters.

[0144] Based on the values ​​of other parameters obtained in step ACC, the reference values ​​can be further adjusted to compensate for external stress sources that do not correspond to photo-induced discomfort.

[0145] The evaluation method also includes the step COMP: comparing at least one value of the at least one parameter with at least one reference value, and detecting photo-induced discomfort in the user based on the comparison.

[0146] For example, reference values ​​include at least one threshold used to detect photo-induced discomfort in users.

[0147] If user discomfort is detected, the assessment method may include the step NOT: notifying the user of the discomfort along with at least one optional suggestion to alleviate the discomfort.

[0148] The notification steps NOT may also include: recording data related to the detected discomfort in memory 5b, and recording and / or notifying eye care practitioners of the data.

[0149] The assessment method may also include step CTL: controlling optical element 7 to relieve discomfort, or controlling external devices (such as light therapy devices) to relieve discomfort.

[0150] The method may include the steps of notifying the user (NOT) and / or controlling the user (CTL) as described above.

Claims

1. A system (3) for assessing photosensitive discomfort in a user, the system (3) comprising a sensor (9) for measuring the electrical conductivity of the user's skin surface, the system (3) being configured to: - Obtain at least one measurement result of the electrical conductivity of the user's skin surface through the sensor (9). - Obtain at least one value of at least one parameter representing the at least one measurement result of the conductance, and - Compare at least one value of the at least one parameter with at least one reference value, and detect the user's photo-induced discomfort based on the comparison.

2. The system (3) according to claim 1, wherein, The at least one parameter includes the peak frequency of the measured conductance, the peak amplitude of the measured conductance, and / or the delay between the peaks of the measured conductance.

3. The system (3) according to claim 1 or 2, wherein, The system (3) includes a notification module (6) configured to send notifications to the user via an interface and / or via an external electronic device (15), and the system (3) is further configured to: - Issue a notification that the user has been detected to be experiencing light-induced discomfort, and optionally, issue a recommendation to adjust or replace the optical element (7) worn by the user.

4. The system (3) according to any one of claims 1 to 3, wherein, The system (3) includes a communication module (11) configured to communicate with at least one controllable optical element (7, 8) worn by the user, which presents variable optical functions. The system (3) is also configured to: - Issue a command to the controllable optical element (7, 8) to modify the variable optical function of the controllable optical element (7, 8) to alleviate the detected light-induced discomfort of the user.

5. The system (3) according to claim 4, wherein, The controllable optical element (7, 8) is a dimming element, and the command for modifying the optical function includes: adjusting the transmittance value of the dimming element, and / or the polarization value of the dimming element, and / or the transition speed between at least two states of the dimming element.

6. In the system (3) according to claim 4 or 5, the communication module is a first communication module. in, The system (3) includes a second communication module (11) configured to control the light therapy device (25) being used by the user, and the system (3) is further configured to: - Issue a command to the light therapy device (25) to adjust the settings of the light therapy device (25) to alleviate the detected light-induced discomfort of the user.

7. The system according to any one of claims 1 to 3, wherein, The system includes a communication module configured to communicate with the light therapy device being used by the user, and the system is further configured to: - Issue a command to the light therapy device to adjust the settings of the light therapy device to alleviate the detected light-induced discomfort of the user.

8. The system (3) according to any one of claims 1 to 7, wherein, The sensor (9) is arranged in the frame (2) of the head-mounted device (1) or in an external device (15) worn by the user in contact with the user's skin surface.

9. The system (3) according to any one of claims 1 to 8, wherein, The system (3) further includes at least one sensor (13) for determining the amount of ambient light, and the system (3) is also configured to: - Compare the amount of ambient light with a predetermined ambient light threshold. - The photo-induced discomfort is also detected based on a comparison of the amount of ambient light with a predetermined ambient light threshold.

10. The system (3) according to any one of claims 1 to 8, wherein, The system (3) further includes at least one position and / or motion sensor (14), and the system (3) is also configured to: - Obtain the value of at least one activity parameter representing the user's position and / or movement through the at least one position and / or motion sensor (14). - Determine the activity-induced pressure level based on the value of the at least one activity parameter, and - Adjust the reference value based on the determined activity-induced stress level.

11. The system (3) according to any one of claims 1 to 10, wherein, The system further includes at least one physiological sensor (23), the at least one physiological sensor being configured to obtain the value of at least one physiological parameter of the user, and the system being further configured to: - The value of the user's at least one physiological parameter is obtained through the at least one physiological sensor (23). - Determine the physiological stress level based on the value of at least one of the physiological parameters, and - Adjust the reference values ​​based on the determined physiological stress levels.

12. The system (3) according to any one of claims 1 to 11, wherein, The reference value was determined specifically for the user during the initial calibration process (CAL).

13. A head-mounted device (1) comprising a frame (2), at least one optical element (7), and a system (3) for assessing photosensitive discomfort of a user, the system (3) comprising a sensor (9) for measuring the electrical conductivity of the user's skin surface, the system (3) being configured to: - The electrical conductivity of the user's skin surface is measured by the sensor (9). - Obtain at least one value representing at least one parameter of the measured conductance, and - Compare at least one value of the at least one parameter with at least one reference value, and detect the user's photo-induced discomfort based on the comparison.

14. A pair of eyeglasses (1), the eyeglasses comprising a frame (2), at least one optical element (7), and a system (3) for assessing a user's photosensitive discomfort, the system (3) comprising a sensor (9) for measuring the electrical conductivity of the user's skin surface, the system (3) being configured to: - The electrical conductivity of the user's skin surface is measured by the sensor (9). - Obtain at least one value representing at least one parameter of the measured conductance, and - Compare at least one value of the at least one parameter with at least one reference value, and detect the user's photo-induced discomfort based on the comparison.

15. A computer-implemented assessment method for evaluating a user's photosensitive discomfort, the assessment method comprising: - The electrical conductivity (MES) of the user's skin surface is obtained through the sensor (9). - Obtain at least one value (PAR) representing at least one parameter of the measured conductance, and - Compare at least one value of the at least one parameter with at least one reference value, and detect the user’s photo-induced discomfort (COMP) based on the comparison.

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