Optical deficiency monitoring equipment comprising eyeglasses

Abstract

To provide a global solution for ensuring the best influence on visual deterioration by giving feedback to eyeglass wearers.SOLUTION: Monitoring equipment (100) comprises an eyewear (110) that includes: a frame (120); at least one lens (130) that is fixed to the frame and that is able to change natural progression of optical deficiency; a wearing sensor (140) able to determine whether the eyewear is being worn by a wearer; and a processing unit (150) that is programmed to acquire data determined by the wearing sensor, the processing unit (150) programmed to deduce therefrom a parameter relative to the length of time the wearer has worn the eyewear during a prescribed period, and compare the parameter with at least a prescribed datum to determine a level of efficiency of the optical deficiency treatment.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to the field of vision, and more particularly to the field of measuring the time spent wearing spectacles.

[0002] The present invention is primarily intended for myopic and pre-myopic children wearing myopia control lenses. [Background technology]

[0003] In recent years, myopia has been increasing worldwide and is becoming a serious social problem. For example, in East Asia, the prevalence can reach 80% of the population.

[0004] In this context, many techniques have been developed to halt or slow the progression of myopia. Among these techniques, several strategies based on special corrective glasses have been reported to be effective.

[0005] One of the key parameters for reducing this progression is the very regular wearing of special corrective glasses, but this regularity is difficult to control in children, especially if they can still see well enough to play without glasses.

[0006] Evaluating this parameter of wear time is important for predicting the outcome of the treatment.

[0007] Moreover, it may be important to monitor other parameters related to the spectacle wearer's environment: indeed, some visual environments are more susceptible to myopia progression than others (myopia occurs more frequently indoors than outdoors).

[0008] There is therefore a need for technology that can provide measurements of the above parameters in order to assess and improve the effectiveness of myopia treatment.

[0009] This need concerns not only myopia, but also other problems in the visual field, such as visual fatigue, age-related macular degeneration, etc., where the wearing of glasses is required to stop or slow the progression of the problem.

[0010] US Patent No. 5,399,633 teaches that a child's improvement in vision is strongly correlated with the amount of eyeglasses worn. To monitor how much a child wears eyeglasses, the document discloses a sensor that can determine when a child is wearing eyeglasses.

[0011] The problem with this solution is that it does not address the issues mentioned above, as it aims to improve vision by measuring the time the device is worn, either to prevent deterioration (myopia prevention) or to avoid deterioration (myopia stabilization).

[0012] Furthermore, this document only teaches monitoring of children and does not mention being able to provide feedback to the child. [Prior art documents] [Patent documents]

[0013] [Patent Document 1] UK Patent No. 2495697 Summary of the Invention [Problem to be solved by the invention]

[0014] In this context, the present invention provides a global solution to ensure the best possible impact on vision degradation by providing feedback to the spectacle wearer. [Means for solving the problem]

[0015] The present invention relates to - Frame, - at least one lens fixed in a frame and capable of altering the natural progression of visual impairment; - a wear sensor capable of determining whether the eyewear is worn by a wearer; and a processing unit, 1- Acquire data determined by the wearable sensor; 2- From there, deduce a parameter related to the length of time the wearer has worn the eyewear during a given period of time; 3- comparing said parameters with at least predetermined data to determine the level of efficiency of the treatment of the visual impairment; A processing unit programmed to The surveillance device comprises eyewear including:

[0016] Preferably, in a fourth step, the processing unit transmits this efficiency level to an HMI (Human Machine Interface) or processes this efficiency level to generate data to be transmitted to the HMI, such as information related to the duration of wearing the eyewear, or advice or alerts allowing the wearer to know if the efficiency of the treatment is improving.

[0017] Other combinable features of the present invention are as follows: - at least certain of the data belong to a model linking the duration of wearing eyewear to an efficiency value of the treatment of a visual impairment, - after a comparison of said parameters with said at least predetermined data, the processing unit is programmed to deduce therefrom a recommendation relating to the period for which the eyewear must be worn and to provide said recommendation to the wearer by means of a human-machine interface, - the at least one lens includes a first optical refractive zone for providing corrective vision to the wearer at a determined distance and a second optical refractive zone for altering the natural progression of a visual impairment; - the eyewear includes a computer memory that stores a type of second optical refraction, the model being selected as a function of the type, - the second optical refraction is of a type selected from among an optical element designed to deflect light rays to reduce ocular elongation signals in front of the wearer's retina when the wearer is wearing the eyewear, or an addition of optical power and prism optical power, or an additional positive power at the lens periphery, or a scattering element in the lens; - the visual impairment is myopia, and at least one of the lenses is designed to slow the natural progression of the visual impairment; - the at least one wearable sensor is integrated into the frame; - the at least one wearable sensor is designed to be removably attached to the frame; - the processing unit is separate from the eyewear, the eyewear comprising a communication unit capable of transmitting the data determined by the worn sensor to the processing unit; - the eyewear comprises an additional sensor capable of determining time information associated with the data, the parameter being determined as a function of the time information; the processing unit is integrated in a mobile electronic device, preferably a smartphone, - the monitoring device comprises a human machine interface, the processing unit being capable of instructing the human machine interface to indicate a period of wearing of the eyewear by the wearer; - the processing unit is programmed to deduce from the duration of wearing of the eyewear by the wearer an advice relating to the duration for which the eyewear must be worn and to provide this advice to the wearer by means of a human-machine interface; - the processing unit is programmed to infer, from the duration of wearing the eyewear by the wearer, an alert related to the need for the wearer to change his / her habits and to provide said alert to the wearer by means of a human-machine interface; The eyewear is equipped with another sensor capable of determining environmental parameters, e.g. related to the brightness of the environment and / or the wearer's situation indoors or outdoors, and its efficiency level is determined based on said environmental parameters.

[0018] The present invention also relates to a method for monitoring a wearer of eyewear comprising a frame, at least one lens fixed to the frame and capable of altering the natural progression of a visual impairment, and a wear sensor capable of determining whether the eyewear is worn by a wearer, the method comprising the steps of: - acquiring data determined by a wearable sensor; - inferring therefrom a parameter related to the length of time the wearer has worn the eyewear during a given period of time; - comparing said parameters with at least predetermined data to determine a level of efficiency of the treatment of the visual impairment; The method includes the steps of:

[0019] Detailed Description of the Preferred Embodiments The following description, with reference to the attached drawings given as non-limiting examples, makes it clear what the invention comprises and how it can be put into practice. [Brief description of the drawings]

[0020] [Figure 1] 1 is a schematic diagram of a first embodiment of a monitoring device according to the present invention; [Diagram 2] FIG. 2 is a schematic diagram of a second embodiment of a monitoring device according to the present invention; [Diagram 3] 1 is a graph showing the change in efficacy of treatment as a function of the duration of wearing the glasses per day. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] The present invention relates to a monitoring device 100 that includes eyewear having at least one lens designed to alter the natural progression of visual impairment.

[0022] In the following description, the visual impairment considered is myopia, but the invention can also be applied to other types of visual impairments that require the wearing of eyewear to prevent deterioration of visual quality, such as visual fatigue, jet lag, phototoxicity, age-related macular degeneration, etc. Eye elongation and axial length are the main markers to follow when assessing the natural progression of myopia.

[0023] The monitoring device 100 according to the invention comprises the following elements: - Eyewear, a wear sensor 140 capable of determining whether the eyewear is being worn by a wearer, and - Processing Unit 150 It is a specific combination of.

[0024] As used herein, the term "eyewear" generally refers to items and accessories worn on or above the eye, which may be for the purpose of improving or enhancing vision or for the purpose of preventing myopia.

[0025] 1 and 2 show two embodiments of this monitoring device 100. These two embodiments have some common features and will therefore be described together.

[0026] In these embodiments, the eyewear is a pair of glasses 110 that includes a frame 120 and two lenses 130 fixed to the frame. In variations, the eyewear may have another shape, such as goggles.

[0027] Frame 120 is a structure that receives, maintains, holds, and / or supports the lenses 130 so that they may be positioned in front of each of the wearer's eyes when the eyeglasses 110 are worn.

[0028] As shown in the figure, the frame 120 includes two rims 121 for receiving the lenses 130, where each of the two rims 121 is full rim. According to various embodiments, the rims may also be half rims, or the frame 120 may be rimless (lenses are screwed onto the frame). Thus, the frame 120 may be a full rim frame or a semi-rimless frame or a rimless frame.

[0029] The frame 120 includes a bridge 123 that sits above the wearer's nose when the eyeglasses 110 are worn.

[0030] The frame 120 also includes a pair of frame temples 122. The pair of frame temples 122 make up a pair of elongated side pieces of the frame 120 and rest on the wearer's ears when the eyeglasses 110 are being worn.

[0031] Lens 130 is designed to correct the natural progression of a visual impairment, here myopia.

[0032] Each lens 130 includes a first optically refractive region for providing corrective vision to the wearer at a predetermined distance, and a second optically refractive region for altering the natural progression of visual impairment.

[0033] The first optical refraction includes, for example, a spherical power to provide the wearer with corrected distance vision (for viewing objects located more than 6 meters away). This first optical refraction may also include a cylindrical power and / or a prismatic power.

[0034] The second optical refraction provides an additional optical feature that is specifically designed to prevent, limit or stop the progression of myopia.

[0035] There are many types of lenses that can slow or stop the progression of myopia, and this second optical refraction can be any of these types. For example: an optical element that generates an ocular elongation signal in front of the wearer's retina when the wearer is wearing the spectacles, or - optical and / or prism add, or - additional positive power in the periphery of the lens, or - scattering elements in the lens, The scattering elements may be located on the lens surface or within the lens.

[0036] Here, the second optical refraction is of the first type. More specifically, it includes optical elements designed to deflect light rays to reduce ocular elongation signals. These optical elements deflect light rays nonlinearly and continuously to generate a three-dimensional volume of light in front of the retina, in which case the progression of myopia may be slowed down. This is called the volume of myopic defocus (VoMD).

[0037] Here, the myopia control lens 130 used preferably comprises a plurality of at least three optical elements (lenslets). Such lenses are for example described in the document WO 2019166654. Such lenses are intended to be worn in front of the wearer's eyes, - a refractive zone having a first refractive power based on a prescription for correcting anomalous refraction of the eye; and - a plurality of at least three optical elements, at least one optical element having an optical function that does not focus an image on the retina of the eye to slow the progression of anomalous refraction of the eye; Includes.

[0038] The optical element may be disposed on at least one of the lens surfaces.

[0039] In a variant, the lens 130 is - a first refractive zone having a first refractive power based on a prescription for correcting anomalous refraction of the eye; and a second refractive region having a power different from the first refractive power and having a function for focusing an image at a location other than the retina of the eye to inhibit progression of anomalous refraction of the eye; Including, The second refractive region is formed as a plurality of independent island-like regions near the center of the lens, and the first refractive region is formed as a region other than the region formed as the second refractive region.

[0040] In another variation, the lens 130 is - a central zone providing a first optical refraction for substantially correcting myopia associated with a foveal region of the wearer's eye; and and a peripheral zone surrounding the central zone, the peripheral zone providing a second optical correction to substantially correct myopia or hyperopia associated with a peripheral region of the retina of the wearer's eye. The wear sensor 140 is designed to determine whether the eyeglasses 110 are worn by a wearer.

[0041] The sensor is preferably integrated into the frame, for example molded into a portion of the frame 120 (for example, one of its temples).

[0042] In a variant, the wearable sensor 140 can be attached to the frame: permanently, for example by adhesive, or removably, for example by snap fastening means or by Velcro®.

[0043] The sensor is designed to frequently detect the wearing state ("worn" or "not worn" state).

[0044] The worn sensor can be of any type. a motion sensor, for example an accelerometer adapted to determine whether the frame is moving; a temperature sensor adapted to determine the temperature in order to infer whether the frame is in contact with the wearer's head, for example a temperature sensor determining the temperature of the inner surface of the temple; - a pressure sensor adapted to determine whether the temples of the frame are supporting the wearer's head; - a pH sensor adapted to determine whether the frame is in contact with the wearer's head; - Light sensor, - Electric field sensors, etc. It could be.

[0045] In the two embodiments shown in the figures, it is an accelerometer. The use of such an accelerometer is advantageous since it can also detect the head pose, which can be used by the processing unit 150 to determine the wearer's vision pose (near vision pose, far vision pose, etc.).

[0046] The frame 120 is preferentially fitted with means for storing or generating electrical energy for supplying electrical current to the processing unit 150 .

[0047] These means include here an energy harvesting converter 151 that converts some form of ambient energy into electricity. This converter 151 can generate an electric current, for example, from the movement of the frame or from sunlight.

[0048] This converter 151 is coupled to an energy processor that stores and delivers electrical energy when required by the processing unit 150 .

[0049] In a variant, these means may comprise a battery, preferably chosen to have a capacity allowing a battery life of at least 6 months.

[0050] The processing unit 150 includes: - acquiring data determined by the wearable sensor 140; - deduce therefrom a parameter P1 related to the length of time that the wearer has worn the spectacles 110 during a given period of time, - comparing said parameter P1 with at least predetermined data to determine the level of efficiency of the treatment of the visual impairment (these steps are explained in more detail below); It is programmed as follows.

[0051] To this end, the processing unit 150 comprises a central processing unit (CPU), memory, and input / output components.

[0052] The memory enables the processing unit to store information used in the processes described below. The memory stores, in particular, computer applications consisting of computer programs containing instructions, the execution of which enables the processing unit 150 to carry out the methods described below.

[0053] It also stores the type of lenses 130 used to slow the progression of myopia. As will be explained below, this data will aid in the comparison step.

[0054] Its input / output components enable the processing unit 150 to receive data measured by the worn sensor 140.

[0055] It may also receive other information from other sensors, if present.

[0056] For example, the frame 120 may include an environmental sensor 142 capable of determining environmental parameters, e.g., related to the brightness of the environment and / or the wearer's status (indoors or outdoors). In this embodiment, the environmental sensor 142 is a light detector suitable for determining the brightness level and transmitting this brightness level to the processing unit 150.

[0057] In a first embodiment shown in FIG. 1, this processing unit 150 is a microcontroller integrated into the glasses 110 .

[0058] In a second embodiment, shown in FIG. 2, this processing unit 150 is remote from the glasses 110 and is formed by a computer or a controller of a mobile device such as a smartphone.

[0059] In these two embodiments, the glasses 110 represented in the drawings have different specificities, which may now be subsequently described.

[0060] In a first embodiment, the glasses 110 are capable of operating autonomously.

[0061] It may contain an HMI (Human Machine Interface) that gives some information to the wearer (advice, alerts, etc.) This HMI can be of any kind (a small LCD display, a small speaker, etc.).

[0062] Here, however, the frame 120 comprises a communication unit 160 suitable for establishing a wireless connection with an information device (computer, smartphone, watch, etc.) so that the processing unit 150 can transmit the parameters P1 and / or the calculated efficiency level to this device, so that this information can be processed by this device.

[0063] This communication unit 160 is preferably a passive or active RFID chip. Such a chip does not require a battery to operate and can be scanned by a reader located up to 15 meters away from the scanner.

[0064] In a second embodiment shown in FIG. 2, the glasses 110 comprise a communication unit 145 capable of transmitting data determined by the worn sensor 140 (and by other sensors, if present) to a processing unit 150.

[0065] Again, this communication unit 145 is preferably a passive or active RFID chip that can be scanned by a reader 155 of the processing unit 150. In a variant, Bluetooth or WIFI can be used.

[0066] In this embodiment, the frame also includes a clock integrated into the frame 120 so that measurements can be dated.

[0067] The time information associated with that measurement is - current time, - Information related to the type of day (school day or weekend) - Period (morning, afternoon, night) It can be either of the following.

[0068] The frame may also include a memory for storing the last measurement and associated time information.

[0069] As will be explained below, in both embodiments, the processing unit 150 is programmed to execute a method for monitoring a wearer of the glasses 110, the method comprising: - acquiring data determined by the worn sensor 140; - deduction therefrom of a parameter P1 related to the length of time that the wearer has worn the spectacles 110 during a given period of time; and - comparing said parameter P1 with at least predetermined data to determine the level of efficiency of the treatment of the visual impairment; The method involves three main steps:

[0070] Preferably, the method includes a fourth step of providing feedback to the wearer, the feedback including information on whether the spectacles are being worn well and / or whether the treatment is effective.

[0071] The first step is executed by the processing unit 150 connected to the worn sensor 140. This step enables the processing unit 150 to store in its memory an acceleration value associated with the date of this acceleration measurement.

[0072] The acceleration value can be the average value of the acceleration experienced by the frame at the moment of measurement, but in this embodiment it is a Boolean value that is equal to 0 (meaning that the glasses are not worn at this time) if the acceleration is lower than a certain threshold, and 1 otherwise.

[0073] The processing unit 150 may also store environmental data (here the measured brightness value) in association with the acceleration value.

[0074] This step is preferably performed regularly at a predetermined frequency, which is preferably less than every 10 minutes to conserve power, here measurements are taken every 15 minutes.

[0075] To achieve the same goal, measurements may be limited to a certain period of time (e.g., 6:00 AM to 11:00 PM). In practice, children are considered to be asleep between 11:00 PM and 6:00 AM. Thus, during the night, processing unit 150 is in standby.

[0076] To conserve power, measurements can be stopped once the duration of eyeglass wear reaches a predefined target threshold for the day.

[0077] This target threshold is, for example, equal to 12 hours, and is selected to ensure that the treatment has maximum efficiency. Its value can vary, for example, so that it is not too high (for example equal to 8 hours) at the beginning of the treatment, and increases regularly to reach an effective value quickly.

[0078] The second step consists in calculating a parameter P1 which indicates how much the glasses 110 have been worn during a "predetermined period".

[0079] The predetermined period is preferably more than 4 hours. It can be a part of a day (e.g. 6:00 am to 11:00 pm), several days, a week, a month, etc. In a preferred embodiment, this predetermined period is equal to one day. As a result, a new value of the parameter P1 is calculated by the processing unit 150 for each day.

[0080] Here, the parameter P1 is equal to an approximation of the length of time the glasses have been worn.

[0081] The value of this parameter P1 is deduced from all measurements made during the previous day. For this purpose, the processing unit considers that if the glasses were worn at the moment of measurement, it means that the glasses 110 were worn 15 minutes before or after this moment. Thus, to determine the parameter P1, the processing unit determines how many times the glasses were worn at the moment of measurement on the previous day and multiplies this number by 15 to obtain the wearing time in minutes.

[0082] Thus, in this embodiment, parameter P1 is equal to the "wearing time" (ie an approximation of the length of time the wearer has worn the glasses 110 during the previous day).

[0083] In variants, parameter P1 may have other meanings: Parameter P1 may be a Boolean value equal to 0 if the wearing time is less than a predefined daily threshold (e.g. 12h 00min) and equal to 1 otherwise.

[0084] In another variant, the parameter P1 can be a matrix of two values: the first value can be the wearing time and the second value can be determined by the following two conditions: (i) wore glasses; (ii) the brightness level was greater than a predefined threshold; may be the length of time that the condition is satisfied.

[0085] Many other variations are possible.

[0086] The third step consists of comparing the parameter P1 (here the wearing time) with at least one threshold value in order to determine the "efficiency level" of the treatment of the visual impairment.

[0087] The efficiency (or effectiveness) level relates to the amount of reduction in myopia progression with the treatment lens compared to the progression that the wearer would have experienced with a control lens (e.g., a single vision lens) that has no provision for altering the natural progression of myopia. The effect is usually expressed in diopters (the difference between the treatment group and the control group wearing the control lens). It can also be expressed as a percentage, in which case it is normalized by the progression of the control group (to represent the difference in progression between the treatment group and the control group). These values ​​are time-dependent (e.g., over one year, over two years, etc.).

[0088] In practice, the parameter P1 is compared with a threshold value loaded into a database, the values ​​stored in which are predetermined values ​​and obtained from a model linking the duration of wearing the spectacles with an efficiency value of the treatment of visual disorders.

[0089] This database enables the processing unit to read the efficiency value that corresponds to the determined wearing time (parameter P1).

[0090] The database (and model) used depends on the type of refractive lens 130 worn. Indeed, the model used to correlate the effectiveness of myopia reduction with the wearing time may depend on the type of myopia control solution. Therefore, prior to this comparison step, the processing unit 150 loads into its memory the type of lens 130 used and then selects the database as a function of the loaded data.

[0091] The efficiency level is expressed here as a percentage, with 0% corresponding to the same progression of myopia as when the wearer uses the control lenses, and 100% corresponding to a cessation of myopia progression, although this percentage can be greater than 100% if myopia is reduced.

[0092] In a variant, 0% may correspond to when the glasses are not worn during the day, and 100% may correspond to the target threshold (i.e. the wearing time at which maximum therapeutic effectiveness is reached).

[0093] In this variant, the percentage may vary between these two values ​​according to a mathematical law (e.g., an exponential). Indeed, it is known that the effectiveness of the lens 130 follows an exponential progression as a function of the wearing time.

[0094] An example of a graph illustrating this mathematical law for the above lens containing at least three multiple optical elements is shown in Figure 3. In this figure, the vertical axis represents the efficiency of the treatment Ef and the horizontal axis represents the daily wearing time dt (in hours) of the spectacles (considered to be worn for the same period on each day of each week of the year).

[0095] In another variation, it may be possible to use a mathematical formula rather than a database to determine the efficiency level.

[0096] In another variant, the efficiency level can be determined as a function of the environmental parameters, taking into account that the efficiency of wearing glasses is greater in some conditions than in others: indeed, time outdoors (in brighter light) has a protective effect against the development of myopia, while fine work is more myopic-inducing.

[0097] In this variation, the efficiency level calculation and / or the target threshold value may be adjusted based on the time spent in each visual environment. For example, it may be possible to give more weight to time spent outdoors than time spent indoors. In this variation, the target threshold (for 12h00m) may be calculated by multiplying the outdoor time by a refraction factor greater than 1 (e.g., equal to 2).

[0098] In another variation, the efficiency level and / or target threshold value may be determined as a function of the wearer's activity (as determined by the accelerometer), which may also favor time spent standing over time spent sitting.

[0099] In another variant, the efficiency level and / or the target threshold value can be determined as a function of the wearing position, taking into account that the efficiency of wearing the glasses is greater in some positions than in other positions (e.g. a far-vision position).

[0100] In another variant, the efficiency level and / or the target threshold value can be determined as a function of the wearing time, taking into account that the efficiency of wearing the glasses is greater in the morning than in the evening. In this variant, more importance can be placed on the time spent in the morning, and the target threshold value (12h00m) can be calculated by multiplying this time by a refractive index greater than 1 (e.g. equal to 2).

[0101] Then, during a fourth step, the processing unit 150 is programmed to provide feedback via an HMI (e.g. a computer or smartphone screen) to the wearer or anyone close to the wearer (parents, optometrist, etc.).

[0102] Here, the processing unit 150 is programmed to display the efficiency level together with a message explaining the meaning of this level when the user requests this data by using an application stored on his / her smartphone.

[0103] The processing unit 150 can also be programmed to display other data. For example, the screen can display the daily wear times for the previous day or days.

[0104] In a preferred embodiment, the processing unit 150 is also programmed to display advice relating to the amount of time the glasses should be worn during the day to ensure good performance of the treatment.

[0105] For example, advice may be issued if the parameter P1 or the efficiency level is below a predefined first threshold.

[0106] If present, the processing unit 150 may display an alert related to the need for the wearer to change their habits.

[0107] For example, an alert may be issued if the parameter P1 or the efficiency level is lower than a predefined second threshold (this second threshold being separate and lower than the first threshold).

[0108] For example, if the wearing time is between 70% and 85% of the target threshold (12 hours and 00 minutes per day), a reminder may be sent to the parent if this behavior is repeated over several days (e.g., over 7 days).

[0109] If wearing time drops below 70% for seven days or 50% for any one day, an alert is sent to parents at the end of that day so they can take immediate action.

[0110] Conversely, a congratulatory message may be issued if the parameter P1 or the efficiency level exceeds a predefined third threshold. Such a message may be issued, for example, if the wearer has worn the glasses for 5 days for more than 12 hours per day.

[0111] In a variant, encouraging feedback may be given if parameter P1 or the efficiency level exceeds a predetermined fourth threshold (eg, corresponding to 95% or more of the 5-day target threshold) that is less than the third threshold.

[0112] Once the target threshold is reached, the wearer may be given further recommendations to improve myopia control, i.e., spending more time outdoors, continuing to wear the glasses, taking more frequent visual breaks when working at a computer, etc.

[0113] In another variation of the invention, if the wearer has not worn the glasses sufficiently, a message may be issued before the end of the day (e.g., 4 p.m.) The message may provide instructions such as one more hour is needed to achieve 70% of myopia control, two more hours to achieve 85% of myopia control, etc.

[0114] All messages may be provided in any manner, including via mobile device message, SMS, instant message, email.

[0115] With this feedback and the measured myopia progression, the optometrist can decide whether it would be better to maintain the type of lenses 130 or to change these lenses to another type of lens.

[0116] If the myopia progression is faster after each follow-up than at the previous follow-up, the processing unit or optometrist can ask the wearer to wear the glasses for a longer time (the daily threshold can be increased) and / or can recommend a change of lenses (e.g. with lenses having optical elements with higher asphericity). [Explanation of symbols]

[0117] 100 Monitoring equipment 110 Glasses 110 Eyewear 120 frames 121 Rim 122 Frame Temple 123 Bridge 130 Lens 140 Wearable Sensor 142 Environmental Sensor 145 Communication Unit 150 Processing Units 151 Energy Harvesting Converter 155 Leader 160 Communication Unit

Claims

1. A surveillance device (100) comprising eyewear (110), the eyewear (110) comprising: - a frame (120), at least one lens (130) fixed in said frame and capable of altering the natural progression of visual impairment, a wear sensor (140) capable of determining whether said eyewear is worn by a wearer; Including, The monitoring device (100) - acquiring the data determined by said worn sensor (140); - deduce therefrom a parameter (P1) related to the length of time that said wearer has worn said eyewear (110) during a given period of time, - comparing said parameter (P1) with at least predetermined data to determine a level of efficiency of the treatment of said visual impairment, said at least predetermined data belonging to a model linking the duration of wearing said eyewear with an efficiency value of the treatment of said visual impairment; The method further comprises: The efficiency level is also determined as a function of activity of the wearer, the activity of the wearer being determined by an accelerometer.

2. 2. The monitoring device (100) of claim 1, wherein after the comparison of the parameter (P1) with the at least predetermined data, the processing unit (150) is programmed to deduce therefrom a recommendation relating to the period for which the eyewear must be worn, and to provide this recommendation to the wearer by way of a human-machine interface.

3. The at least one lens (130) comprises: a first optically refractive area for providing the wearer with corrective vision at a determined distance; and a second optical refractive zone for altering the natural progression of the visual impairment, The monitoring device (100) of claim 1, comprising:

4. 4. The monitoring device of claim 3, wherein the eyewear includes a computer memory that stores a type of the second optical refraction, and the model is selected as a function of the type.

5. The second optical refraction is an optical element designed to deflect light rays to reduce ocular elongation signals in front of the wearer's retina when the wearer is wearing the eyewear, or - Addition of optical power and prism optical power, or - additional positive power in the lens periphery, or - scattering elements in the lens, 5. The monitoring device (100) according to claim 3 or 4, which is of a type selected from the following:

6. 2. The monitoring device (100) of claim 1, wherein the visual impairment is myopia, and the at least one lens (130) is designed to slow the natural progression of the visual impairment.

7. The monitoring device (100) of claim 1, wherein the at least one worn sensor (140) is integrated into the frame (120).

8. The monitoring device (100) of claim 1, wherein at least one of the worn sensors (140) is designed to be removably attached to the frame.

9. 2. The monitoring device (100) of claim 1, wherein the processing unit (150) is separate from the eyewear (110), the eyewear (110) comprising a communication unit capable of transmitting the data determined by the worn sensor (140) to the processing unit (150).

10. 10. The monitoring device (100) of claim 9, wherein the eyewear (110) comprises an additional sensor (141) capable of determining time information associated with the data, and the parameter (P1) is determined as a function of the time information.

11. 2. The monitoring device (100) of claim 1, wherein the processing unit (150) is programmed to infer from the duration of wearing of the eyewear by the wearer an advice relating to the duration for which the eyewear must be worn, and to provide this advice to the wearer by a human-machine interface.

12. 2. The monitoring device (100) of claim 1, wherein the processing unit (150) is programmed to infer from the duration of wearing the eyewear by the wearer an alert related to the need for the wearer to change his / her habits and to provide said alert to the wearer by a human-machine interface.

13. 2. The monitoring device (100) of claim 1, wherein the eyewear comprises another sensor (142) capable of determining an environmental parameter, e.g. related to the brightness of the environment and / or the wearer's situation indoors or outdoors, and the efficiency level is determined based on the environmental parameter.

14. The monitoring device (100) of claim 1, wherein the acquisition of data determined by the worn sensor (140) is performed regularly, at a predetermined frequency less than every 10 minutes.

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