Optical defect monitoring apparatus comprising a pair of spectacles

Abstract

The invention relates to a monitoring device (100) comprising eyewear (110) comprising: - a frame (120), - at least one lens (130) fixed to the frame and capable of modifying the natural evolution of an optical defect, - a wearing sensor (140) capable of determining whether the eyewear is worn by a wearer, and - a processing unit (150) programmed to: - acquire data determined by the wearing sensor, - deduce therefrom a parameter relating to the length of time the eyewear is worn by the wearer over a predetermined period of time, and - compare said parameter with at least predetermined data to determine the level of efficiency of the treatment of the optical defect.

Description

Technical Field

[0001] This invention relates to the field of optics, and more specifically to the field of measuring the wearing time of eyeglasses.

[0002] This invention is primarily aimed at children with myopia and pre-myopia who wear myopia control lenses. Background Technology

[0003] In recent years, myopia has increased worldwide and has become a serious public health problem. For example, in East Asia, the prevalence rate can reach 80% of the population.

[0004] Against this backdrop, numerous technologies have been developed to halt or slow the progression of myopia. Among these technologies, several strategies based on specialized corrective lenses have been reported to be effective.

[0005] One of the key parameters for reducing this evolution is the very regular wearing of special corrective glasses. However, this regularity is difficult to control in children, especially when they can play with clear vision without glasses.

[0006] Assessing the duration of wear is crucial for predicting treatment outcomes.

[0007] In addition, other parameters related to the wearer's environment can also be important to monitor. In fact, certain visual environments are more likely to cause myopia than others (myopia is more likely to develop indoors than in the sun).

[0008] Therefore, there is a need for a technology that can provide measurements of the above parameters to assess and improve the effectiveness of myopia treatment.

[0009] This need extends beyond myopia to other issues in the field of optics, including the need to wear glasses to prevent or slow the progression of problems such as eye strain and age-related macular degeneration.

[0010] Document GB2495697 indicates that improvements in children's vision are closely related to the amount of time they wear glasses. To monitor the extent to which children wear glasses, this document discloses a sensor capable of determining when children wear glasses.

[0011] The problem with this solution is that it doesn't address the issues mentioned above because it's designed to measure the duration of device wear in order to improve vision when we want to prevent degeneration (prevent myopia), avoid degeneration (stabilize myopia), or limit degeneration (slow down the progression of myopia).

[0012] Furthermore, the document only discusses monitoring children and does not mention providing feedback to them. Summary of the Invention

[0013] In this context, the present invention provides a comprehensive solution that ensures the best possible impact on optical degradation by providing feedback to the eyewear wearer.

[0014] This invention includes a monitoring device comprising an eye-wearing accessory, the eye-wearing accessory comprising:

[0015] -Eyeglass frames,

[0016] - At least one lens, which is fixed to the frame and capable of altering the natural evolution of optical defects.

[0017] - A wearable sensor that can determine whether the eyewear is being worn by a wearer, and

[0018] - Processing unit, which is programmed to:

[0019] 1-Acquire data determined by the wearable sensor.

[0020] 2. Derive parameters related to the duration of time the wearer wears the eyewear within a predetermined time period, and

[0021] 3- Compare the parameters with at least predetermined data to determine the efficiency level of optical defect treatment.

[0022] Preferably, in the fourth step, the processing unit sends the efficiency level to the HMI (Human-Machine Interface), or processes the efficiency level to generate data to be sent to the HMI. This data may be information related to the duration of wearing the eyepiece, suggestions to inform the wearer whether treatment efficiency is improving, or alarms, etc.

[0023] Other combinable features of the present invention are:

[0024] - The at least predetermined data belongs to a model that links the duration of wearing the eyepiece to the efficiency of the treatment of the optical defect.

[0025] - After comparing the parameters with the at least predetermined data, the processing unit is programmed to derive a recommendation related to the duration the eyewear must be worn, and to provide this recommendation to the wearer via a human-machine interface.

[0026] - The at least one lens includes a first optical refractive region for providing the wearer with correct vision at a defined distance, and a second optical refractive region for altering the natural evolution of the optical defect.

[0027] - The eyepiece includes a computer memory that stores the type of the second optical refraction, and the model is selected according to the type.

[0028] - The second optical refraction is selected from the following types: optical elements designed to deflect light to reduce the elongation signal in front of the wearer's retina when the wearer wears the eyepiece; or an increase in optical power and prism power; or additional positive power at the periphery of the lens; or a scattering element in the lens.

[0029] - The optical defect is myopia, and the at least one lens is designed to slow down the natural evolution of this optical defect.

[0030] -The at least one wearable sensor is embedded in the frame.

[0031] - The at least one wearable sensor is designed to be removably attached to the frame.

[0032] The processing unit is located remotely from the eye-wearing device, and the eye-wearing device includes a communication unit capable of transmitting the data determined by the wear sensor to the processing unit.

[0033] - The eye-wearing device includes an additional sensor capable of determining time information associated with the data, and the parameters are determined based on the time information.

[0034] This processing unit is embedded in a mobile electronic device, preferably in a smartphone.

[0035] The monitoring device includes a human-machine interface, and the processing unit is capable of commanding the human-machine interface to display the duration for which the wearer wears the eyewear.

[0036] The processing unit is programmed to derive a suggestion related to the required duration of wearing the eyewear from the duration the wearer wears it, and to provide this suggestion to the wearer via a human-machine interface.

[0037] The processing unit is programmed to derive an alert related to the wearer's need to change their habits based on the duration of time the wearer wears the eyewear, and to provide this alert to the wearer via a human-machine interface.

[0038] - The eye-wearing device includes another sensor capable of determining environmental parameters, such as those related to ambient brightness and / or the wearer's indoor or outdoor conditions, and the efficiency level is determined based on these environmental parameters.

[0039] The present invention also relates to a method for monitoring the wearer of an eyewear device, the eyewear device including a frame, at least one lens, and a wearing sensor, the at least one lens being fixed to the frame and capable of altering the natural evolution of optical defects, the wearing sensor being capable of determining whether the eyewear device is being worn by a wearer, the method comprising the following steps:

[0040] -Acquire data determined by the wearable sensor.

[0041] - Derive parameters related to the duration of time the wearer wears the eyewear within a predetermined time period, and

[0042] - Compare the parameters with at least predetermined data to determine the efficiency level of optical defect treatment. Detailed Implementation

[0043] The following description, with reference to the accompanying drawings and by way of non-limiting examples, makes clear the scope of the invention and the ways in which it may be practiced.

[0044] In the attached diagram:

[0045] - Figure 1 This is a schematic diagram of a first embodiment of the monitoring device according to the present invention.

[0046] - Figure 2 This is a schematic diagram of a second embodiment of the monitoring device according to the present invention, and

[0047] - Figure 3 It is a graph showing the functional relationship between changes in treatment efficiency and the duration of wearing one pair of glasses per day.

[0048] The present invention relates to a monitoring device 100, which includes an eye-wearing device having at least one lens designed to alter the natural evolution of optical defects.

[0049] In the following description, the optical defect considered will be myopia, but the invention can also be applied to other types of visual defects that require the wearing of eye-worn devices to prevent a decline in visual quality, such as eye strain, jet lag, phototoxicity, and age-related macular degeneration. Eye elongation and axial length are key indicators to consider during the assessment of the natural evolution of myopia.

[0050] The monitoring device 100 according to the present invention is a specific combination of the following elements:

[0051] -Eyewear,

[0052] - Wearable sensor 140, which is capable of determining whether an eye-wearing device is being worn by a wearer, and

[0053] - Processing unit 150.

[0054] As used herein, the term “eyewear” generally refers to items and accessories worn on or above the eyes for the purpose of improving or enhancing visual acuity or for the purpose of preventing myopia.

[0055] exist Figure 1 and Figure 2 In the present paper, we illustrate two embodiments of the monitoring device 100. These two embodiments share several common features and will therefore be described together.

[0056] In these embodiments, the eyewear is a pair of glasses 110, which includes a frame 120 and two lenses 130 fixed to the frame. In variations, this eyewear can have different shapes (goggles, etc.).

[0057] The frame 120 is a structure that receives, holds, holds, and / or supports the lenses so that when the glasses 110 are worn, the lenses 130 can be placed in front of the wearer's respective eyes.

[0058] As shown in the figure, the frame 120 includes two lens rings 121 for receiving lenses 130. Here, each of these two lens rings 121 is a full lens ring. According to various embodiments, the lens rings may also be half lens rings, or the frame 120 may be rimless (the lenses are screwed onto the frame). Accordingly, the frame 120 may be a full lens ring frame, a half lens ring frame, or a rimless frame.

[0059] The frame 120 includes a nose bridge 123, which is positioned above the wearer's nose when the glasses 110 are worn.

[0060] The frame 120 also includes a pair of temples 122. The pair of temples 122 form a pair of elongated side panels of the frame 120, which rest against the wearer's ears when the glasses 110 are worn.

[0061] Lens 130 is designed to alter the natural evolution of optical defects (in this case, myopia).

[0062] Each lens 130 includes a first optical refractive region for providing the wearer with correct vision at a defined distance, and a second optical refractive region for altering the natural evolution of optical defects.

[0063] For example, the first optical refraction includes a spherical power that provides the wearer with correct distance vision (for viewing objects located at a distance of 6 meters or more). This first optical refraction may also include cylindrical and / or prism power.

[0064] The second optical refraction provides additional optical features. This refraction is specifically designed to prevent, limit, or halt the evolution of myopia.

[0065] There are many types of lenses that can slow or stop the progression of myopia: the second optical refraction can be any of these types. For example, it can be selected from:

[0066] - Optical elements that, when the wearer wears the glasses, generate an eye elongation signal in front of the wearer's retina, or

[0067] - An increase in optical power and / or prism optical power, or

[0068] -Additional positive focus at the periphery of the lens, or

[0069] - A scattering element in the lens. The scattering element can be placed on the surface of the lens or inside the lens.

[0070] Here, the second optical refraction is of the first type. More specifically, it includes optical elements designed to deflect light rays to reduce the eye's elongation signal. These optical elements will continuously deflect light rays in a non-linear manner, thereby generating a three-dimensional amount of light in front of the retina, which in this case can slow the progression of myopia. This is called myopic defocus (VoMD).

[0071] Here, the myopia control lens 130 preferably comprises a plurality of, or at least three, optical elements (microlenses). Such lenses are described, for example, in document WO 2019166654. These lenses are intended to be worn in front of the wearer's eyes and include:

[0072] - A refractive region having a first refractive power based on a prescription for correcting the refractive error of the eye; and

[0073] - Multiple, at least three optical elements, at least one of which has the optical function of not focusing the image onto the retina of the eye in order to slow the progression of refractive errors in the eye.

[0074] Optical elements can be placed on at least one lens surface.

[0075] In the variant, lens 130 includes:

[0076] - A first refractive region having a first refractive power based on a prescription for correcting refractive errors in the eye; and

[0077] - A second refractive region, which has a different refractive power than the first refractive region, and has the function of focusing the image on a location other than the retina of the eye in order to suppress the progression of refractive errors in the eye.

[0078] The second refractive region is formed as multiple independent island-like regions near the center of the lens, while the first refractive region is formed as the region other than the region formed as the second refractive region.

[0079] In another variant, lens 130 includes:

[0080] - The central zone, which provides primary refractive power to substantially correct myopia associated with the fovea of ​​the wearer's eye; and

[0081] A peripheral area surrounding the central area provides a second optical correction to substantially correct myopia or hyperopia associated with the peripheral area of ​​the wearer's retina. Wearing sensor 140 is designed to determine whether the glasses 110 are being worn by the wearer.

[0082] The sensor is preferably embedded in the frame. It is molded, for example, into a portion of the frame 120 (e.g., into one of its temples).

[0083] In a variant, the wearing sensor 140 can be attached to the eyeglass frame. It can be permanently attached to the frame, for example, by adhesive. Alternatively, it can be secured, for example, by a snap-on fastener or by... It can be removably attached to the frame.

[0084] The sensor is designed to frequently detect the wearing status (“wearing” or “not wearing”).

[0085] The wearable sensor can be of any type. It can be:

[0086] - Motion sensors, such as accelerometers suitable for determining whether the eyeglass frame has moved.

[0087] - A temperature sensor, suitable for determining the temperature to infer whether the frame is in contact with the wearer's head; for example, a temperature sensor that determines the temperature of the inner surface of the temples.

[0088] - Pressure sensors, suitable for determining whether the temples of the eyeglasses are against the wearer's head.

[0089] - pH sensor, suitable for determining whether the frame is in contact with the wearer's head.

[0090] - Optical sensor

[0091] -Electric field sensor...

[0092] In the two embodiments shown in the figure, it is an accelerometer. Using such an accelerometer is advantageous because it can also detect head posture, which the processing unit 150 can use to determine the wearer's visual posture (near vision posture, far vision posture, etc.).

[0093] The frame 120 is preferably equipped with a device for accumulating or generating electrical energy to supply current to the processing unit 150.

[0094] Here, these devices include an energy harvesting transducer 151 that converts some form of ambient energy into electrical energy. The transducer 151 can generate an electric current, for example, from the movement of the eyeglass frame or from sunlight.

[0095] The transducer 151 is coupled to an energy processor that stores electrical energy and delivers it to the processing unit 150 when needed.

[0096] In some variations, these devices may include a battery. In this variation, the battery is preferably selected to have a capacity that allows for a battery life of at least 6 months.

[0097] Processing unit 150 is programmed as follows:

[0098] -Acquire data determined by the wearable sensor 140,

[0099] - From this, derive the parameter P1, which relates to the length of time the wearer wears the glasses 110 within a predetermined time period, and

[0100] - Compare the parameter P1 with at least predetermined data to determine the efficiency level of optical defect treatment (these steps will be described in more detail below).

[0101] For this purpose, the processing unit 150 includes a central processing unit (CPU), memory, and input / output components.

[0102] Because of its memory, the processing unit stores information used in the processes described below. In particular, it stores computer applications, which consist of computer programs including instructions that, when executed, allow the processing unit 150 to implement the methods described below.

[0103] It also stores the types of lenses 130 used to slow the progression of myopia. As explained below, this data will be useful for the comparison process.

[0104] Due to its input / output components, the processing unit 150 can receive data measured by the wearable sensor 140.

[0105] It can also receive additional information from other sensors (if any).

[0106] For example, the frame 120 may include an environmental sensor 142 capable of determining environmental parameters, such as those relating to ambient brightness and / or the wearer's situation (is he indoors or outdoors?). In this embodiment, the environmental sensor 142 is a light detector adapted to determine a brightness level and send that brightness level to the processing unit 150.

[0107] exist Figure 1 In the first embodiment shown, the processing unit 150 is a microcontroller embedded in the glasses 110.

[0108] exist Figure 2 In the second embodiment shown, the processing unit 150 is located away from the glasses 110 and is formed by a controller of a computer or mobile device (such as a smartphone).

[0109] In these two embodiments, the two pairs of glasses 110 shown in the figures have different special characteristics, which can now be described in turn.

[0110] In the first embodiment, the glasses 110 are capable of operating autonomously.

[0111] It can include an HMI (Human Machine Interface) to provide the wearer with information (suggestions, alerts, etc.). The HMI can be of any kind (small LCD display, small speaker, etc.).

[0112] However, here, the frame 120 includes a communication unit 160 adapted to establish a wireless connection with an information technology device (computer, smartphone, watch, etc.). Therefore, the processing unit 150 can send parameters P1 and / or the calculated efficiency level to the device, allowing the information to be processed by the device.

[0113] The communication unit 160 is preferably a passive or active RFID chip. This chip operates without any batteries and can be scanned by a reader at a distance of 15 meters from the scanner.

[0114] exist Figure 2 In the second embodiment shown, the glasses 110 includes a communication unit 145 that can transmit data determined by the wear sensor 140 (and by other sensors, if any) to the processing unit 150.

[0115] Similarly, here, the communication unit 145 is preferably a passive or active RFID chip that can be scanned by the reader 155 of the processing unit 150. In variations, Bluetooth or WIFI can be used.

[0116] In this embodiment, the frame also includes a clock embedded in the frame 120 and capable of marking the date for measurements.

[0117] The time information associated with the measurement can be any of the following:

[0118] - Current time,

[0119] -Information related to day type (school day or weekend day)

[0120] -Time period (morning, afternoon, evening).

[0121] The frame may also include a memory to store the last(s) measurements and associated time information.

[0122] As explained below, in both embodiments, the processing unit 150 is programmed to perform a method for monitoring the wearer of a pair of glasses 110, the method comprising three main steps:

[0123] -Acquire data determined by the wearable sensor 140,

[0124] - From this, derive the parameter P1, which relates to the length of time the wearer wears the glasses 110 within a predetermined time period, and

[0125] - Compare the parameter P1 with at least predetermined data to determine the efficiency level of optical defect treatment.

[0126] Preferably, the method includes a fourth step of providing feedback to the wearer, which includes information about whether the glasses have been worn for a sufficient amount of time and / or whether the treatment is effective.

[0127] The first step is performed by the processing unit 150 connected to the wearable sensor 140. This step enables the processing unit 150 to store in its memory the value of the acceleration associated with the date of the acceleration measurement.

[0128] The acceleration value can be the average of the acceleration experienced by the frame at the time of measurement. However, in this embodiment, the acceleration value is a Boolean value, equal to 0 if the acceleration is below a predetermined threshold (indicating that the glasses are not being worn at this time), and equal to 1 otherwise.

[0129] The processing unit 150 can also store environmental data (here, the measured brightness value) in association with the acceleration value.

[0130] This step is preferably performed regularly at a predetermined frequency. This frequency is preferably less than once every 10 minutes to save power. Here, a measurement is taken every 15 minutes.

[0131] To achieve the same purpose, measurements can be limited to a predetermined time period (e.g., from 6 a.m. to 11 p.m.). Children are indeed considered to be sleeping between 11 p.m. and 6 a.m. During the night, the processing unit 150 is therefore in standby mode.

[0132] To save power, measurements can be stopped when the glasses have been worn for a predetermined target duration throughout the day.

[0133] This target threshold is, for example, equal to twelve hours. This time is chosen to ensure the treatment is most effective. The value of this time may vary; for example, it should not be too high at the beginning of treatment (e.g., equal to eight hours) and should be increased regularly to quickly reach an effective value.

[0134] The second step involves calculating parameter P1, which describes the degree of wear of the glasses 110 during the "predetermined time period".

[0135] The predetermined time period is preferably longer than four hours. It can be a part of a day (e.g., from 6 a.m. to 11 p.m.), several days, a week, a month, etc. In a preferred embodiment, the predetermined time period is equal to one day. Therefore, the processing unit 150 calculates a new value for parameter P1 every day.

[0136] Here, parameter P1 is an approximation of the duration of wearing the glasses.

[0137] The value of parameter P1 is derived from all measurements taken on the previous day. Therefore, the processing unit assumes that if the glasses were worn at the measurement time, it indicates that the glasses 110 were worn within 15 minutes before or after that time. Thus, to determine parameter P1, the processing unit determines the number of times the glasses were worn at the measurement time on the previous day and multiplies that number by fifteen to obtain the wearing time in minutes.

[0138] Therefore, in this embodiment, parameter P1 is equal to "wearing time" (i.e., an approximation of the length of time the wearer wore the glasses 110 in the previous day).

[0139] In the variant, parameter P1 can have other meanings. It can be a Boolean value, equal to 0 if the wearing time is less than a predetermined daily threshold (e.g., 12h00), and equal to 1 otherwise.

[0140] In another variant, parameter P1 can be a matrix containing two values. The first value can be the wearing time, and the second value can be the duration of time satisfying the following two conditions:

[0141] (i) The glasses are already being worn.

[0142] (ii) The brightness level is greater than a predetermined threshold.

[0143] Many other variations can be considered.

[0144] The third step involves comparing parameter P1 (here, the wearing time) with at least one threshold to determine the “efficiency level” of the optical defect treatment.

[0145] Efficiency (or effectiveness) refers to the reduction in myopia progression experienced by the treatment lens compared to the progression a wearer would encounter when using control lenses (e.g., single-vision lenses) that do not alter the natural evolution of myopia. Effectiveness is typically expressed in diopters (the difference between the treatment group and the control group wearing control lenses). It can also be expressed as a percentage, in which case it is normalized to the progression of the control group (to represent the difference in progression between the treatment and control groups). These values ​​are time-dependent (e.g., over one year, two years, etc.).

[0146] In practice, parameter P1 is compared with a threshold read from the database. The values ​​stored in the database are predefined and derived from a model that correlates the duration of wear of a pair of glasses with the efficiency of optical defect treatment.

[0147] Thanks to this database, the processing unit can read the efficiency value corresponding to a given wearing time (parameter P1).

[0148] The database (and model) used depends on the type of refractive lens 130 worn. In fact, the model used to correlate myopia reduction efficacy with wearing time may depend on the type of myopia control solution. Therefore, prior to this comparison step, the processing unit 150 reads the type of lens 130 used from its memory and then selects a database based on the read data.

[0149] Here, efficiency levels are expressed as a percentage, with 0% corresponding to the same progression of myopia as when the wearer was using control lenses, and 100% corresponding to the cessation of myopia progression. This percentage can be higher than 100% if the degree of myopia decreases.

[0150] In the variant, 0% can correspond to the situation where the glasses are not worn during the day, while 100% can correspond to the target threshold (i.e., the wearing time to achieve maximum therapeutic efficacy).

[0151] In this variant, the percentage can vary between these two values ​​by following mathematical laws (e.g., exponentiation). Indeed, the efficacy of lens 130 is known to increase exponentially as a function of wearing time.

[0152] Figure 3The figure shows an example of a graph illustrating the mathematical laws governing a lens comprising multiple, at least three, optical elements. In this graph, the vertical axis represents the therapeutic efficiency Ef, while the horizontal axis represents the daily wearing time dt (hours) of the glasses (assuming that the glasses are worn for the same duration every day of every week over a year).

[0153] In another variant, mathematical equations can be used instead of a database to determine the efficiency level.

[0154] In another variation, the efficiency level can be determined based on the environmental parameters to account for the higher efficiency of wearing the glasses under certain conditions compared to others. Indeed, time spent outdoors (in brighter light) has a protective effect against myopia, while close-up work is more likely to cause it.

[0155] In this variant, the calculation of the efficiency level and / or target threshold values ​​can be adjusted based on the time spent in each visual environment. For example, more weight can be given to the time spent outdoors compared to the time spent indoors. In this variant, the target threshold (12H00) can be calculated by multiplying the outdoor time by a refractive factor greater than 1 (e.g., equal to 2).

[0156] In another variant, the efficiency level and / or target threshold value can be determined based on the wearer's activity (determined by an accelerometer). In this variant, the time spent standing can also be given more weight compared to the time spent sitting.

[0157] In another variant, the efficiency level and / or target threshold value can be determined based on the wearing posture, so as to take into account that the efficiency of wearing the glasses is higher in some postures than in others (e.g., in distance vision posture).

[0158] In another variant, the efficiency level and / or target threshold value can be determined based on the wearing time to account for the higher efficiency of wearing the glasses in the morning than in the evening. In this variant, more weight can be given to the time spent in the morning: the target threshold (12H00) can be calculated by multiplying that time by a refractive factor greater than 1 (e.g., equal to 2).

[0159] Then, during the fourth step, the processing unit 150 is programmed to provide feedback to the wearer or anyone near the wearer (parent, optometrist, etc.) via an HMI (such as the screen of a computer or smartphone).

[0160] Here, the processing unit 150 is programmed to display an efficiency level and a message explaining the meaning of that level when a user requests the data using an application stored in their smartphone.

[0161] The processing unit 150 can also be programmed to display other data. For example, the screen can display the daily wearing time of the previous day or several days.

[0162] In a preferred embodiment, the processing unit 150 is also programmed to display suggestions related to the length of time the glasses must be worn that day to ensure good treatment results.

[0163] For example, a suggestion can be issued when parameter P1 or the efficiency level is below a predetermined first threshold.

[0164] The processing unit 150 can display alerts, if any, related to the wearer's need to change their habits.

[0165] For example, an alarm can be issued when parameter P1 or efficiency level is lower than a predetermined second threshold (which is different from and lower than the first threshold).

[0166] For example, if the wearing time is between 70% and 85% of the target threshold (12:00 PM per day), and if this behavior is repeated over several days (e.g., more than 7 days), a reminder can be sent to the parents.

[0167] If the wear time is less than 70% for more than seven days or less than 50% on a particular day, an alert will be sent to parents at the end of the day so that they can take immediate action.

[0168] Conversely, a congratulatory message can be issued when parameter P1 or the efficiency level exceeds a predetermined third threshold. For example, such a message can be issued when the wearer wears the glasses for more than 12 hours a day for five consecutive days.

[0169] In the variant, encouraging feedback can be given when parameter P1 or efficiency level exceeds a predetermined fourth threshold that is less than the third threshold (e.g., corresponding to reaching more than 95% of the target threshold within 5 days).

[0170] If the target threshold has been reached, further suggestions can be made to the wearer to improve myopia control: spend more time outdoors, continue wearing glasses, and take more frequent visual breaks when working on a computer...

[0171] In another variation of the invention, if the wearer has not worn their glasses for a sufficient amount of time, a message may be sent before the end of the day (e.g., at 4 PM). This message might indicate that 1 hour is needed to achieve 70% myopia control, 2 hours are needed to achieve 85% myopia control, and so on.

[0172] All messages can be delivered via mobile messaging, SMS, instant messaging, email, or any other means.

[0173] Based on this feedback and the measured progression of myopia, optometrists can decide whether it's better to keep the 130 type of lenses or to replace them with a different type.

[0174] If myopia progresses faster at each follow-up than at the last follow-up, the treatment unit or optometrist may ask the wearer to wear the glasses for a longer period (which may increase the daily threshold), and / or may recommend replacing the lenses (e.g., replacing them with lenses with higher asphericity optics).

Claims

1. A monitoring device (100) comprising eyewear, the eyewear comprising: - a frame (120), - at least one lens (130) fixed to the frame and capable of modifying the natural evolution of an optical defect, wherein the at least one lens (130) comprises a first optical power zone for providing the wearer with correct vision at a determined distance and a second optical power zone for modifying the natural evolution of the optical defect, and - a wearing sensor (140) capable of determining whether or not the eyewear is worn by the wearer, wherein the monitoring device (100) further comprises a processing unit (150) programmed to: - acquire data determined by the wearing sensor (140), - derive therefrom a parameter (PI) relating to the length of time the eyewear is worn by the wearer over a predetermined period of time, and - compare the parameter (PI) with at least predetermined data to determine a level of efficiency of an optical defect treatment, wherein the at least predetermined data belong to a model linking the duration of wearing the eyewear with a value of efficiency of the optical defect treatment, and wherein the eyewear comprises a computer memory storing a type of the second optical power zone and the model is selected as a function of the type.

2. The monitoring device (100) according to claim 1, wherein After comparing the parameter (PI) with the at least predetermined data, the processing unit (150) is programmed to derive therefrom a recommendation relating to the duration of time the eyewear must be worn and to provide this recommendation to the wearer through a human-machine interface.

3. The monitoring device (100) according to claim 1, wherein The second optical power zone is of a type chosen from: - an optical element designed to deviate light rays to reduce the ocular elongation signal in front of the retina of the wearer when the eyewear is worn by the wearer, or - an increase in optical power and prismatic power, or - an additional positive power of the periphery of the lens.

4. The monitoring device (100) according to claim 1, wherein The optical defect is myopia and the at least one lens (130) is designed to slow down the natural evolution of the optical defect.

5. The monitoring device (100) according to claim 1, wherein The at least one wearing sensor (140) is embedded in the frame (120).

6. The monitoring device (100) according to claim 1, wherein The at least one wearing sensor (140) is designed to be removably attached to the frame.

7. The monitoring device (100) according to claim 1, wherein The processing unit (150) is remote from the eyewear and wherein the eyewear comprises a communication unit capable of transmitting the data determined by the wearing sensor (140) to the processing unit (150).

8. The monitoring device (100) according to claim 7, wherein The eyewear comprises an additional sensor capable of determining time information associated with the data and wherein the parameter (PI) is determined as a function of the time information.

9. The monitoring device (100) according to claim 1, wherein The processing unit (150) is programmed to derive therefrom a recommendation relating to the duration of time the eyewear must be worn from the duration of time the eyewear is worn by the wearer and to provide this recommendation to the wearer through a human-machine interface.

10. The monitoring device (100) according to claim 1, wherein The processing unit (150) is programmed to derive from the duration of the wearer wearing the eyewear an alert relating to the need for the wearer to change his habits, and to provide this alert to the wearer through a human-machine interface.

11. The monitoring device (100) according to claim 1, wherein The eyewear comprises another sensor (142) capable of determining an environmental parameter, and wherein the level of efficiency is determined on the basis of the environmental parameter.

12. The monitoring device (100) according to claim 11, wherein The environmental parameter relates to the ambient luminosity and / or to the situation of the wearer indoors or outdoors.

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