Computing unit, optical system and method for detecting the health status of the system's user

Abstract

The invention relates to a computing unit (17) for detecting the health status of a user of an optical system (19a) worn on the user's head. The computing unit (17) is configured to receive at least one light signal detected by a detector unit (40a) of the optical system (19a), which is determined by a first light ray (15b) reflected from a first area (4b) of the user's eye (1). The first area (4b) is located outside a pupil (2) of the user's eye (1). Furthermore, the computing unit (17) serves to detect the color of a first area (4b) of the user's eye (1) as a function of the received first light signal. Finally, the computing unit (17) is configured to detect the user's health status as a function of the detected color of the first area (4b) of the user's eye (1).

Description

[0001] The invention relates to a computing unit for detecting the health status of a user of an optical system worn on the user's head. Furthermore, the invention relates to an optical system for detecting the health status of the user of the optical system and a method for detecting the health status of a user of an optical system worn on the user's head. State of the art

[0002] Document WO 2023 / 150211 A1 proposes monitoring various parts or characteristics of the user's eye using smart glasses to monitor the user's health status. This involves using pupil size, the rate of pupil dilation, eye movement patterns, and gaze directions for health monitoring.

[0003] It is an object of the present invention to develop a computing unit that can detect other abnormalities in the health condition of a user of an optical system worn on the user's head. Disclosure of the invention

[0004] To solve the problem, a computing unit for detecting the health status of a user of an optical system worn on the user's head according to claim 1 is proposed. Furthermore, an optical system, in particular an optical system worn on the user's head, for detecting the health status of the user of the optical system according to claim 3, and a method for detecting the health status of a user of an optical system worn on the user's head according to claim 15 are proposed.

[0005] The processing unit for detecting the health status of a user of an optical system worn on the user's head is designed to receive at least one light signal from a detector unit of the optical system. This signal is detected based on a first light ray reflected from a first area of ​​the user's eye. The first area is located outside the pupil of the user's eye. Furthermore, the processing unit serves to detect the color of this first area of ​​the user's eye, particularly its current color, based on the received first light signal. In addition, the processing unit is designed to recognize the user's health status based on the detected color of this first area. For example, a yellowish sclera in the first area of ​​the user's eye could indicate liver problems, or a reddened sclera could indicate a deficiency in omega-3 fatty acids.Preferably, the computing unit is further equipped to control a display unit to show the health status to the user.

[0006] Preferably, the processing unit is designed to detect the color of the first area only when there is essentially no ambient light. This prevents ambient light from reaching the detector as interference that could distort the detected first light signal. The detection of the color of the user's first area is therefore less prone to error.

[0007] A further object of the present invention is an optical system for detecting the health status of the user of the optical system. The optical system is, in particular, an optical system worn on the user's head. In this context, the optical system comprises at least one light unit for emitting at least one first light beam with at least one first wavelength. The light unit is further configured to emit the first light beam onto a first area of ​​the user's eye. The first area is located outside the pupil of the user's eye. The light unit is, in particular, a laser diode. Furthermore, the optical system comprises a detector unit for detecting at least one first light signal as a function of the first light beam reflected back from the first area of ​​the user's eye.Furthermore, the optical system includes a processing unit, which is configured in particular as the processing unit described above. The processing unit serves to recognize at least one, in particular the current, color of the first region of the user's eye, depending on the first light signal detected by the detector unit. The processing unit is further configured to recognize the user's health status depending on the recognized color of the first region of the user's eye. Preferably, the optical system also includes a display unit for displaying the health status to the user. The display unit is configured in particular as an acoustic display unit that communicates the current health status to the user acoustically. Optionally, the display unit is configured as an optical display unit.In this context, the display unit is specifically designed as a retinal projection unit that projects the user's health status, particularly in the form of the first light rays, onto the retina. Furthermore, the display unit is specifically designed as a smart device, such as a mobile phone or a smartwatch.

[0008] Preferably, the light unit is configured to emit first light beams with at least two wavelengths simultaneously, wherein the detector unit is configured as a photodetector and serves to detect, in particular, a different intensity of the backscattered first light beams as the first light signal. Alternatively, the light unit is preferably configured to emit first light beams with different wavelengths, in particular red, green, and / or blue light beams, sequentially. Here, the detector unit is configured as a photodetector that serves to detect, in particular, a different intensity of the backscattered first light beams as the first light signal. In this context, the system preferably further comprises an optical filter configured to allow only the first backscattered light beams to pass towards the detector unit.This prevents ambient light from reaching the detector as interference, which could distort the detected initial light signal. The color recognition of the user's first visual field is therefore less prone to error.

[0009] Preferably, the optical system additionally includes an eye-tracking device designed to determine the user's gaze direction. In this context, the processing unit is configured to recognize at least one color, particularly the current color, of the first region of the user's eye, depending on the user's lateral gaze direction detected by the eye-tracking device. If the user is looking to the side, the sclera, as the first region of the user's eye, is oriented centrally forward in the direction of the head. The first light rays can therefore be emitted centrally onto the user's eye at this moment, which simplifies the design of the optical system. The first light unit can thus also be more easily integrated into a projection unit, particularly a retinal projection unit, since the light path of the first light rays is the same as in the projection.

[0010] Preferably, the optical system additionally comprises a projection unit with a scanner. The scanner is, in particular, a microscanner, also known as a microprojector. In this context, the projection unit also includes the light unit. The light unit is further configured to emit, at a first time, second light beams, in particular image data, in a red, green, and / or blue wavelength range, and at a second time, the first light beams. The second light beams represent, in particular, image data for projection into the user's eye. Furthermore, the optical system additionally comprises a deflection unit, which is, in particular, configured as a first holographic optical element. The scanner is configured to scan the first and second light beams via the deflection unit.Furthermore, the deflection unit serves to redirect the second light rays towards the user's retina and the first light rays towards the first region of the user's eye. This optical system thus offers, on the one hand, the possibility of projecting image data into the user's eye and, on the other hand, of detecting the user's health status. The optical system can therefore also simultaneously serve to display the detected health status of the user. Preferably, the deflection unit is designed as a first holographic optical element, which has a first deflection function, in particular a wavelength-dependent one, that serves to redirect the first light rays towards the user's retina. Furthermore, the first holographic optical element has a second deflection function, in particular a wavelength-dependent one, which is designed to redirect the first light rays towards the first region of the user's eye.In this context, the first holographic optical element preferably has a first, central region designed to redirect the first light rays toward the user's retina. Furthermore, the first holographic optical element has a second peripheral region designed to redirect the first light rays toward the first region of the user's eye. Alternatively, the redirection unit may also have a second holographic optical element. The first holographic optical element serves to redirect the first light rays toward the pupil and thus the user's retina. The second holographic optical element, which is preferably arranged spatially separate from the first holographic optical element, serves, in contrast, to redirect the first light rays toward the first region of the user's eye.The second holographic optical element is positioned next to the first holographic optical element relative to the user's eye. Alternatively, the second holographic optical element is positioned behind or in front of the first holographic optical element relative to the user's eye. Preferably, the first and second light rays have the same wavelength. Alternatively, the light unit is preferably configured to emit the second light rays with a wavelength different from that of the first light rays.

[0011] In conjunction with the previously described projection unit, the deflection unit is preferably configured to focus the first light rays at different times, particularly during the scanning process, towards the first area of ​​the user's eye, essentially at a single position within that area. Thus, the first light rays always strike the same position at different times. This results in a high degree of measurement accuracy with respect to this single position within the first area of ​​the user's eye. Alternatively, the deflection unit is configured to focus the first light rays at different times, particularly during the scanning process, towards the first area of ​​the user's eye at different positions within that area. This allows for a larger area of ​​the first area to be examined for color.

[0012] Preferably, the first part of the user's eye is formed as the sclera. Alternatively or additionally, this area is formed as the iris. Both the color of the sclera and the color of the iris can provide information about the user's state of health.

[0013] Preferably, the optical system is designed as smart glasses. The detector unit of the smart glasses is preferably arranged in or on the temple of the smart glasses, particularly on the projector unit integrated into the temple. Alternatively, the detector unit is arranged in or on the nose bridge of the smart glasses. Another alternative is the detector unit arranged in or on the temple at the transition to the frame of the smart glasses. A further alternative is the detector unit arranged in or on the lens.

[0014] A further aspect of the present invention is a method for detecting the health status of a user of an optical system worn on the user's head. The optical system is the one described above. Here, at least one light beam with at least one wavelength is first emitted onto a first area of ​​the user's eye by means of a light unit. The first area is located outside the pupil of the user's eye. Furthermore, at least one light signal is detected by a detector unit as a function of the first light beam reflected back from the first area of ​​the user's eye. In a further step, at least one, in particular the current, color of the first area of ​​the user's eye is recognized by a processing unit as a function of the first light signal detected by the detector unit.In a further process step, the user's health status is determined by the processing unit based on the detected color of the first area of ​​the user's eye. In a further optional process step, the detected health status is displayed to the user via a display unit of the optical system. Description of the drawings Fig. Figure 1 schematically shows an optical system for detecting the health status of the user of the optical system. Fig. Figure 2 shows a first embodiment of an optical system for detecting the health status of the user of the optical system. Fig. Figure 3a shows a second embodiment of an optical system for detecting the health status of the user of the optical system in a first view. Fig. Figure 3b shows the second embodiment of the optical system in a second view. Fig. Figure 4 shows a third embodiment of an optical system for detecting the health status of the user of the optical system in a first view. Fig. Figures 5a to 5c show different initial light signals in the form of detected light intensities for the recognition of a, in particular current, color of a first area of ​​the user's eye. Fig. Figure 6 shows two detected first light signals of a first light beam reflected back from the user's eye in the form of a broadband white light. Fig. Figure 7 shows a procedure for detecting the health status of a user of an optical system worn on the user's head in the form of a flowchart. Description of the exemplary implementations

[0015] The Fig. Figure 1 schematically shows an optical system 80, which is specifically designed as an optical system worn on a user's head and serves to detect the user's health status. The optical system also includes a processing unit 50. This processing unit 50 serves to detect the user's health status and is configured to receive at least one light signal 20 from a detector unit 30 of the optical system 80, which is detected as a function of a first light ray reflected from a first area of ​​the user's eye 1. The first area is located outside a pupil 2 of the user's eye 1. Furthermore, the processing unit 50 is configured to detect a color, particularly the current color, of a first area of ​​the user's eye 1 as a function of the received first light signal.The processing unit 50 is additionally configured to recognize the user's health status based on the detected color of the first area of ​​the user's eye 1. The optical system 80 further comprises a light unit 10 for emitting at least one first light beam with at least one first wavelength. The light unit 10 is further configured to emit the first light beam onto the first area of ​​the user's eye. Optionally, the optical system 80 also comprises a display unit 70 for displaying the health status to the user. In this context, the processing unit 50 serves to control the display unit 70.

[0016] Optionally, the computing unit 50 is designed to recognize the color of the first area only at a time when there is essentially no ambient light.

[0017] Fig. Figure 2 shows a first embodiment of an optical system 19a for detecting the health status of the user of the optical system 19a in the form of smart glasses. The optical system 19a comprises a projection unit 13 with a scanner 14, which is configured in particular as a microscanner. The projection unit 13 also includes a light unit 15, which is configured to emit, at a first time, second light beams, in particular image data, in a red, green, and / or blue wavelength range, and, at a second time, first light beams 3b. Furthermore, the optical system 19a comprises a deflection unit 7, which in this case is configured as a first holographic optical element integrated into a lens 6 of the smart glasses.The scanner 14 serves to scan the first and second light rays via the deflection unit 7, and the deflection unit 7 is configured to deflect the second light rays towards the pupil 2 or a retina of the user, and the first light rays 3b towards a first area 4b of the user's eye 1. In the illustrated case, the deflection function of the deflection unit 7, which is particularly wavelength-dependent, is the same for the first and second light rays. The first area 4b of the user's eye 1 represents the sclera of the user's eye 1 in this case. Alternatively or additionally, the first area 4b can also include the iris 11, but not the pupil 2 of the user's eye 1. Furthermore, the optical system 19a has a detector unit 40a for detecting at least one first light signal as a function of the first light ray 15b reflected back from the first area 4b of the user's eye 1.Furthermore, the optical system includes a processing unit 17, which serves to recognize at least one, in particular the current, color of the first area 4b of the user's eye 1 depending on the first light signal detected by the detector unit 40a. The processing unit 17, which in this case is integrated into the temple 9 of the smart glasses, also serves to recognize the user's health status depending on the recognized color of the first area 4b of the user's eye 1.

[0018] In the depicted case, the deflection unit 6 is configured to focus the first light rays 3b at different times, particularly during the scanning process, towards the first area 4b of the user's eye 1, essentially at a single position within the first area 4b. Alternatively, the deflection unit 6 is configured to focus the first light rays 3b at different times, particularly during the scanning process, towards the first area of ​​the user's eye 1 at different positions within a thus larger first area, e.g., along a line.

[0019] Furthermore, in this first embodiment, the optical system 19a includes an eye-tracking device 23, which is configured to determine the user's gaze direction. The processing unit 17 is further configured to recognize, depending on the user's lateral gaze direction as depicted here and detected by the eye-tracking device 23, at least one, in particular the current, color of the first area 4b of the user's eye 1.

[0020] In the first embodiment shown, the detector unit 40 is arranged on the temple 9 of the smart glasses. Alternatively, the detector unit 40 can also be arranged in the temple 9, or in or on the temple 9 at the transition to the frame 8 of the smart glasses, or in or on the lens 6, or in or on the nose bridge of the smart glasses (not shown here).

[0021] In the depicted case, the light unit 15 is configured to emit the first light rays 3b with at least two wavelengths simultaneously. Furthermore, the detector unit 40, configured as a photodetector, is configured to detect, in particular, a different intensity of the backscattered first light rays as the first light signal. Optionally, the light unit is configured to emit first light rays 3b with different wavelengths, in particular red, green, and / or red light rays, sequentially. Here too, the detector unit 40 is configured as a photodetector, serving to detect, in particular, a different intensity of the backscattered first light rays 15b as the first light signal.

[0022] Fig. Figure 3a shows a second embodiment of an optical system 19b for detecting the health status of the user of the optical system 19b in the form of data glasses. In contrast to the first embodiment, the deflection unit 21, designed as a first holographic optical element, has a first, wavelength-dependent deflection function and a second, wavelength-dependent deflection function that differs from the first. The first deflection function serves to deflect the first light rays towards the pupil 2 or retina of the user. The second deflection function serves to deflect the first light rays towards the first area 13b of the user's eye 1. Fig. Figure 3b shows the deflection unit 21 integrated into the spectacle lens 6 in a different representation in the direction of the user's eye 1. The deflection unit 21 is exposed in such a way that it has the first deflection function in the central area 24 and the second deflection function in the peripheral areas 22a, 22b, 22c and 22d.

[0023] Furthermore, the optical system 19b has an optical filter 41 which is designed to allow only the first reflected light rays to pass in the direction of the detector unit 40a.

[0024] Furthermore, in this embodiment, the light unit 15 is designed to emit the second light rays with a wavelength different from the first light rays.

[0025] Fig. Figure 4 shows a third embodiment of an optical system 19c for detecting the health status of the user of the optical system 19c in the form of data glasses.

[0026] In contrast to the previous embodiments, the optical system 19c has a light unit 33 configured to emit at least one first light beam 31 of at least one wavelength directly, that is, without prior deflection by, for example, a holographic optical element, onto a first area 32 of the user's eye 1. If the light unit 33 can only emit broadband light at any given time, the detector unit 34 is configured to distinguish colors. In this context, the detector unit 34 can be configured as a simple colorimeter consisting of several pixels, as an RGB camera, or as a spectrometer. If the light unit 33 can project different colors successively, the detector unit 34 can be configured as a monochrome camera or as a monochrome photodetector.

[0027] Fig. Figure 5a shows an example of an initial measurement sequence of detected first light signals for recognizing the color of the first area of ​​the user's eye. Here, the wavelength of the detected light signal, or in this case, the light spectrum, is plotted on the x-axis (101b), and the intensity of the detected light signal is plotted on the y-axis (101a). Figure 103a represents the detected blue first light signal, 103b the detected green first light signal, and 103c the detected red first light signal. The intensity, as well as the comparison of the first light signals (103a, 103b, and 103c) with each other, indicates a white color for the first area of ​​the user's eye.

[0028] In contrast, the intensity and comparison of the detected blue first light signal 106a, the detected green first light signal 106b and the detected red first light signal 106c indicate Fig. 5b indicates a red color in the first area of ​​the user's eye.

[0029] Furthermore, the intensity and comparison of the detected blue first light signal 108a, the detected green first light signal 108b and the detected red first light signal 108c indicate Fig. 5c indicates a yellow color in the first area of ​​the user's eye.

[0030] Fig. Figure 6 shows two examples of detected first light signals, 113a and 113b, which can be detected under continuous white illumination. Figure 113a shows the intensity spectrum of a white first region of the user's eye, and Figure 113b shows the intensity spectrum of a red first region of the user's eye.

[0031] Fig.Figure 7 shows a method for detecting the health status of a user of an optical system worn on the user's head. In a process step 130, at least one light beam with at least one wavelength is emitted onto a first area of ​​the user's eye by means of a light unit of the optical system. The first area is located outside the pupil of the user's eye. In a subsequent process step 140, at least one light signal is detected by a detector unit of the optical system, based on the first light beam reflected back from the first area of ​​the user's eye. In a subsequent process step 150, at least one color, in particular the current color, of the first area of ​​the user's eye is recognized by a processing unit of the optical system, based on the first light signal detected by the detector unit.In a further process step 160, the user's health status is determined by the processing unit based on the detected color of the first area of ​​the user's eye. The process is then terminated.

[0032] In a further optional procedure step 170, following procedure step 160, the detected health status is displayed to the user by means of a display unit of the optical system. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] WO 2023 / 150211 A1

[0002]

Claims

[1] A computing unit (17, 50) for detecting the health status of a user of an optical system (19a, 19b, 19c, 80) worn on the user's head, wherein the computing unit (17, 50) is configured to receive at least one light signal detected from a detector unit (30, 34a, 40a) of the optical system (19a, 19b, 19c, 80) as a function of a first light ray (15b, 33) reflected back from a first area (4b, 13b, 32) of the user's eye (1), wherein the first area (4b, 13b, 32) is located outside a pupil (4a) of the user's eye (1), and to detect a, in particular current, color of a first area (4b, 13b, 32) of the user's eye (1) as a function of the received first light signal, wherein the The computing unit (17, 50) is additionally designed to recognize the health status of the user, depending on the detected color of the first area (4b, 13b, 32) of the user's eye (1). [2] Computing unit (17, 50) according to claim 1, characterized by , that the computing unit (17, 50) is designed to recognize the color of the first area (4b, 13b, 32) only at a time when there is essentially no ambient light. [3] Optical system (19a, 19b, 19c, 80) in particular an optical system (19a, 19b, 19c, 80) worn on the head of a user, for detecting a health condition of the user of the optical system (19a, 19b, 19c, 80), wherein the optical system (19a, 19b, 19c, 80) comprises at least the following components: - a light unit (10, 15, 33) for emitting at least one first light ray (3b, 31) with at least one first wavelength, wherein the light unit (10, 15, 33) is further configured to emit the first light ray (3b, 31) onto a first area (4b, 13b, 32) of an eye (1) of the user, and the first area (4b, 13b, 32) is located outside a pupil (2) of the user's eye (1), and - a detector unit (30, 34a, 40a) for detecting at least one first light signal depending on the first light ray (15b, 33) reflected back from the first area (4b, 13b, 32) of the user's eye (1), and - a computing unit (17, 50), in particular according to one of claims 1 or 2, for recognizing at least one, in particular current, color of the first area (4b, 13b, 32) of the user's eye (1) depending on the first light signal detected by the detector unit (30, 34a, 40a), wherein the computing unit (17, 50) is configured to recognize the health status of the user depending on the recognized color of the first area (4b, 13b, 32) of the user's eye (1). [4] Optical system (19a, 19b, 19c, 80) according to claim 3, characterized by , that the light unit (10, 15, 33) is configured to emit first light rays (3b, 31) with at least two wavelengths simultaneously, wherein the detector unit (30, 34a, 40a) is configured as a photodetector and serves to detect an, in particular different, intensity of the reflected first light rays (15b, 33) as the first light signal. [5] Optical system (19a, 19b, 19c, 80) according to claim 3, characterized by , that the light unit (10, 15, 33) is configured to emit first light rays (3b, 31) with different wavelengths, in particular red, green and / or blue light rays, successively in time, wherein the detector unit (30, 34a, 40a) is configured as a photodetector and serves to detect an, in particular different, intensity of the backscattered first light rays (15b, 33) as the first light signal. [6] Optical system (19a, 19b, 19c, 80) according to one of claims 4 or 5, characterized by , that the optical system (19a, 19b, 19c, 80) further comprises an optical filter (41) designed to allow only the first reflected light rays (15b, 33) to pass in the direction of the detector unit (30, 34a, 40a). [7] Optical system (19a, 19b, 19c, 80) according to any one of claims 3 to 6, characterized by, that the optical system (19a, 19b, 19c, 80) additionally has an eye tracker device (23) which is configured to determine a gaze direction of the user, wherein the computing unit (17, 50) is configured to recognize, depending on a lateral gaze direction of the user detected by means of the eye tracker device (23), at least one, in particular current, color of the first area (4b, 13b, 32) of the user's eye (1). [8] Optical system (19a, 19b, 19c, 80) according to any one of claims 3 to 7, characterized bythat the optical system (19a, 19b, 19c, 80) additionally comprises a projection unit (13) with a scanner (14), in particular a microscanner, wherein the projection unit (13) additionally comprises the light unit (10, 15, 33), wherein the light unit (10, 15, 33) is configured to emit, at a first time, second light beams, in particular image data, in a red, green and / or blue wavelength range, and, at a second time, the first light beams (3b, 31), wherein the optical system (19a, 19b, 19c, 80) additionally comprises a deflection unit (7, 21), in particular a first holographic optical element, wherein the scanner (14) is configured to scan the first (3b, 31) and second light beams via the deflection unit (7, 21), and wherein the deflection unit (7, 21) is configured is, the second light rays towards a retina of the user and the first light rays (3b, 31) towards the first area (4b, 13b,32) of the user's eye (1). [9] Optical system (19a, 19b, 19c, 80) according to claim 8, characterized by , that the deflection unit (7, 21) is configured as a first holographic optical element, wherein the first holographic optical element has a first, in particular wavelength-dependent, deflection function configured to deflect the first light rays (3b, 31) towards the user's retina, wherein the first holographic optical element has a second, in particular wavelength-dependent, deflection function configured to deflect the first light rays (3b, 31) towards the first area (4b, 13b, 32) of the user's eye. [10] Optical system (19a, 19b, 19c, 80) according to claim 9, characterized by , that the light unit (10, 15, 33) is designed to emit the second light rays with a wavelength different from the first light rays. [11] Optical system (19a, 19b, 19c, 80) according to any one of claims 8 to 10, characterized by , that the deflection unit (7, 21) is designed to focus the first light rays (3b, 31) at different times, especially during the scan process, towards the first area (4b, 13b, 32) of the user's eye (1) essentially at a single position of the first area (4b, 13b, 32). [12] Optical system (19a, 19b, 19c, 80) according to any one of claims 8 to 10, characterized by , that the deflection unit (7, 21) is designed to focus the first light rays (3b, 31) at different times, especially during the scanning process, towards the first area (4b, 13b, 32) of the user's eye (1) at different positions of the first area (4b, 13b, 32). [13] Optical system (19a, 19b, 19c, 80) according to any one of claims 3 to 12, characterized by, that the first area (4b, 13b, 32) of the user eye (1) is formed as a sclera of the user eye (1) and / or as an iris of the user eye (1). [14] Optical system (19a, 19b, 19c, 80) according to any one of claims 3 to 13, characterized by , that the optical system (19a, 19b, 19c, 80) is designed as a data spectacle, wherein the detector unit (30, 34a, 40a) - in or on the temple (9) of the smart glasses, in particular on the projector unit (13) integrated in the temple (9), or - in or on the nose bridge of the data glasses, or - in or on the temple (9) at the transition to the frame (8) of the smart glasses, or - is located in or on the spectacle lens (6). [15] Method for detecting the health status of a user of an optical system (19a, 19b, 19c, 80) worn on the user's head according to any one of claims 3 to 14, wherein the method comprises the following steps: - Emitting (130) at least one first light ray (3b, 31) with at least one first wavelength onto a first area (4b, 13b, 32) of an eye (1) of the user by means of a light unit (10, 15, 33) of the optical system (19a, 19b, 19c, 80), wherein the first area (4b, 13b, 32) is located outside a pupil (2) of the user's eye (1), and - Detection (140) of at least one first light signal depending on the first light ray (15b, 33) reflected back from the first area (4b, 13b, 32) of the user's eye (19) by means of a detector unit (30, 34a, 40a) of the optical system (19a, 19b, 19c, 80), and - Detecting (150) at least one, in particular current, color of the first area (4b, 13b, 32) of the user's eye (1) depending on the first light signal detected by the detector unit (30, 34a, 40a) by means of a computing unit (17, 50) of the optical system (19a, 19b, 19c, 80), and - Detect (160) the health status of the user depending on the detected color of the first area (4b, 13b, 32) of the user's eye (1) using the computing unit (17, 50).

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