Method, computing unit and optical system for determining a distance of an eye from a spectacle lens

Abstract

The invention relates to a method for determining a distance (24a) of an eye (1a) from a spectacle lens (6). In this case, a first laser diode (16) emits a laser beam (21) which is scanned over a first holographic optical element (20a) by means of a micromirror (15) and then deflected to the eye (1a), wherein the holographic optical element is arranged in or on a first region of a spectacle lens (6). During scanning, the laser beam (21) is incident on the first holographic optical element (20a) at different points of incidence (32, 33) at different points in time. A first photodiode (35) is used to detect a laser beam (22) that was incident on the holographic optical element (35) at a first point of incidence (32) and was reflected off the eye (1a). Furthermore, a first position of the eye (1a) is determined in an XY-plane which, in particular, is at an arbitrary distance from the spectacle lens (6). In addition, a first XY-plane (50a) is determined by means of a relationship between the detected first point of incidence (32) and the first XY-plane (50a) to be determined, wherein the relationship is stored for the first position of the eye (1a) in the XY-plane. Furthermore, the distance (24) of the eye (1a) from the spectacle lens (6) is determined on the basis of the determined first XY-plane (50a).

Description

[0001] R.414162

[0002] - 1 -

[0003] Description

[0004] Method, computing unit and optical system for determining the distance between an eye and a spectacle lens

[0005] The invention relates to a method for determining the distance between an eye, in particular the pupil of the eye, and a spectacle lens, particularly one located in front of the eye in the direction of gaze, especially in a Z-direction. The invention further relates to a computing unit for determining the distance between an eye and a spectacle lens and an optical system.

[0006] State of the art

[0007] Smart glasses with retinal projection are known from the prior art. It can happen that the smart glasses shift on the user's nose, leading to an inaccurate two-dimensional detection of the eye, particularly the pupil, by the eye tracker integrated into the smart glasses. However, precise detection of the eye's position, especially the pupil, is necessary for retinal projection in order for the laser beam of the optical system to target the pupil.

[0008] It is an object of the present invention to develop a method which solves the problem described above, in particular the technical problem.

[0009] Disclosure of the invention

[0010] To solve the problem, a method for determining the distance between an eye, in particular the pupil of the eye, and a spectacle lens, particularly one located in front of the eye in the direction of gaze, and especially in a Z-direction, is proposed according to claim 1. Furthermore, a computing unit for determining the distance between the eye and the spectacle lens is proposed according to claim 1.

[0011] 11 is proposed. Furthermore, an optical system according to claim 11 is proposed.

[0012] 12 proposed. R.414162

[0013] - 2 -

[0014] In the method for determining the distance between an eye and a spectacle lens, the distance in question is, in particular, the distance between the pupil of the eye and the spectacle lens, especially to a first holographic optical element arranged in or on a first region of the spectacle lens. Furthermore, the spectacle lens is positioned in front of the eye in the direction of gaze and is arranged relative to the eye in the Z-direction. In the method, a laser beam is first emitted by means of a first laser diode. The laser beam is then scanned by means of at least one micromirror across a first holographic optical element arranged in or on a first region of the spectacle lens. During scanning, particularly during a scan cycle, the laser beam strikes the first holographic optical element at different times and at different points of impact.The laser beam is then redirected towards the user's eye by means of the first holographic optical element. Furthermore, at least one laser beam, emitted at a first time, striking the first holographic optical element at a first point of impact, and reflected by the eye, in particular by the cornea or sclera, is detected by means of a first photodiode. Additionally, a first position of the eye, in particular the pupil, is determined in an XY plane. This XY plane is essentially parallel to the principal plane of extension of the spectacle lens. Furthermore, this XY plane is arbitrarily spaced from the spectacle lens. It is therefore one of several possible XY planes whose distance to the spectacle lens is still unknown.In a further step, a first XY plane, in which the eye, in particular the pupil, is positioned, is determined by means of an assignment of the detected first point of impact and the first XY plane to be determined, stored in a memory unit, particularly in a first look-up table. This stored assignment allows for the precise determination of which of the possible XY planes the eye, in particular the pupil, is currently positioned. In a further process step, the distance of the eye, in particular the pupil, to the spectacle lens is determined as a function of the determined first XY plane using the processing unit. The described method thus allows for the determination of a three-dimensional position of the eye, in particular the pupil. Preferably R.414162.

[0015] - 3 - the distance of the first XY plane to the spectacle lens is also stored in the storage unit, in particular in the first look-up table.

[0016] Preferably, for the first position of the eye in the XY plane, which is arbitrarily spaced from the spectacle lens, a first mapping of the different points of impact of the laser beams and the first XY plane to be determined is stored by the storage unit. In contrast, for a second position of the eye in the XY plane, which differs from the first position, a second mapping, which differs from the first, is stored by the storage unit. This second mapping, in particular a second look-up table, contains the different points of impact of the laser beams and a second XY plane to be determined, in which the eye, in particular the pupil of the eye, is positioned at the second position of the eye. For each position of the eye in an XY plane arbitrarily spaced from the spectacle lens, a corresponding mapping, in particular a look-up table, is stored on the storage unit.

[0017] Preferably, a reflection signal, in particular an intensity of the reflected laser beam, is determined by the processing unit as a function of the detected, reflected laser beam. The respective point of impact of the detected laser beam on the first holographic optical element is then determined by the processing unit as a function of the reflection signal, in particular a temporal profile of the reflection signal. Based on this temporal profile, the processing unit can determine, in particular, the scan angle to which the detected laser beam corresponds. Preferably, the geometry of the eye around an axis of rotation of the eye in the XY plane, which is arbitrarily spaced from the spectacle lens, is also determined by the processing unit as a function of the reflection signal.Alternatively or additionally, the rotation of the eye around an axis of rotation of the eye in the XY plane, particularly at an arbitrary distance from the spectacle lens, is determined by the processing unit. Both the geometry and the rotation of the eye produce different deflections of the laser beams towards the photodiode for the same position of the eye in the respective XY plane, and thus also different reflection signals. By comparison with, for example, a look-up table, the geometry and / or the rotation of the eye can be determined. The first XY- R.414162.

[0018] - 4 -

[0019] The plane is then determined using the mapping of the first point of impact and the first XY plane to be determined, which is stored for the first position of the eye in the XY plane (particularly at an arbitrary distance from the lens) and for the respective determined geometry of the eye and / or rotation of the eye. At least two mappings or look-up tables are therefore required. However, this results in a more accurate determination of the distance between the eye, especially the pupil, and the lens. Alternatively, the distance between the eye and the lens can be determined by assuming a spherical eye in the XY plane (particularly at an arbitrary distance from the lens). Furthermore, the distance between the eye and the lens can be determined by assuming an elliptical pupil with a principal plane of extension in the XY plane (particularly at an arbitrary distance from the lens). This saves computational power.Alternatively, at least one laser beam emitted at a second time point following the first, striking the first holographic optical element at a second point of impact, and reflected by the eye, in particular by the cornea or sclera of the eye, is detected by means of a second photodiode. Furthermore, the geometry of the eye, in particular the geometry of the pupil, and / or the rotation of the eye about an axis of rotation of the eye in the XY plane, in particular at an arbitrary distance from the spectacle lens, is determined as a function of an assignment of the points of impact of the laser beams emitted and detected at the different times and the geometry of the eye and / or rotation of the eye about the axis of rotation of the eye, which is stored in a third look-up table.The first XY plane is then determined by assigning the points of impact of the emitted and detected laser beams to the first XY plane at different times, based on the eye's position in the XY plane (which is arbitrarily spaced relative to the spectacle lens) and the eye's geometry and / or rotation. This further refines the determination of the distance between the eye, particularly the pupil, and the spectacle lens.

[0020] Preferably, information about the first position of the eye, in particular the pupil of the eye, in which, in particular arbitrarily, the spectacle lens is positioned is obtained. R.414162

[0021] - 5 - The XY plane was recorded using an eye tracker. The eye tracker is, in particular, a laser feedback interferometer sensor or a camera unit. If a laser feedback interferometer sensor is used, the emitted infrared laser beam can also be used to determine the distance between the eye, especially the pupil, and the spectacle lens.

[0022] Preferably, the first area of ​​the spectacle lens is arranged in an outer area, particularly within a principal plane of extension of the spectacle lens. The first holographic optical element is thus located in the peripheral field of vision of the user, so that the field of vision is not disturbed.

[0023] Preferably, the laser beam is additionally scanned by a second holographic optical element arranged in or on a second area, particularly a central area, of a spectacle lens. Subsequently, the laser beam is redirected by the second holographic optical element towards the eye in such a way that an image is projected onto the eye. The laser beam emitted by the photodiode can thus be used both for image projection, particularly retinal projection, and for determining the distance between the eye, particularly the pupil, and the spectacle lens.

[0024] A further object of the present invention is a computing unit for determining the distance of an eye, in particular a pupil of the eye, to a spectacle lens, in particular located in front of the eye in the direction of gaze, especially in a Z-direction. The computing unit serves in particular to carry out the method described above. The computing unit is configured to receive a reflection signal of a laser beam emitted at a first time, scanned, incident at a first holographic optical element arranged in or on a first region of a spectacle lens with a first point of impact, reflected by an eye, in particular a cornea or sclera of the eye, and detected by means of a first photodiode. Furthermore, the computing unit is configured to determine a first position of the eye, in particular its current position, in a direction, in particular arbitrarily, relative to the R.414162

[0025] - 6 -

[0026] The processing unit is used to determine the XY plane at the distance between the spectacle lens and the eye. Furthermore, it serves to determine a first XY plane in which the eye, in particular the pupil, is positioned, specifically its current position, by means of an assignment of the detected first point of impact and the first XY plane to be determined, stored in a memory unit, particularly in a first look-up table. The processing unit also serves to determine the distance of the eye, in particular the pupil, to the spectacle lens as a function of the determined first XY plane.

[0027] A further aspect of the present invention is an optical system comprising a first laser diode for emitting a laser beam. The optical system further comprises a first holographic optical element arranged in or on a first region of a spectacle lens. In addition, the optical system includes a micromirror for scanning the laser beam across the first holographic optical element. During scanning, particularly during a scan cycle, the laser beam strikes the holographic optical element at different times and at different points of impact.Furthermore, the optical system comprises a first photodiode configured to detect at least one laser beam emitted at a first time, striking the first holographic optical element at a first point of impact, and being reflected by the eye, in particular by the cornea or sclera of the eye. The optical system also comprises a storage unit for assigning the detected first point of impact and the first XY plane to be determined, specifically in a first look-up table, to the first position of the eye in the XY plane, which may be arbitrarily spaced from the spectacle lens. In addition, the optical system comprises the previously described computing unit.

[0028] Preferably, the optical system additionally comprises a second photodiode, which is configured to detect at least one laser beam emitted at a second time point following the first, striking the first holographic optical element at a second point of impact, and being reflected by the eye, in particular by the cornea or sclera of the eye. The processing unit is configured in this context to R.414162

[0029] - 7 - a geometry of the eye, in particular a geometry of the pupil, and / or a rotation of the eye about a rotation axis of the eye in the XY plane, depending on an assignment of the points of impact of the laser beams emitted and detected at the different times and the geometry of the eye and / or rotation of the eye about the rotation axis of the eye to be determined, in particular in a second look-up table. Furthermore, the processing unit serves to determine the first XY plane by means of the assignment of the points of impact of the laser beams emitted and detected at the different times and the first XY plane to be determined, which is stored for the position of the eye in the XY plane and for the respective determined geometry of the eye and / or rotation of the eye.

[0030] Preferably, the optical system is designed as a data glasses system.

[0031] Preferably, the first photodiode, and especially the second photodiode, is positioned laterally next to the eye, particularly on the temple of a pair of glasses. In this position, the first and / or second photodiode does not obstruct the user's field of vision.

[0032] Description of the drawings

[0033] Figures 1a to 1c show different embodiments of a method for determining the distance between an eye and a spectacle lens.

[0034] Figure 2a shows a first embodiment of an optical system for determining the distance of an eye to a spectacle lens with a first position of the eye in an XY plane.

[0035] Figure 2b shows the first embodiment of the optical system with a second and third position of the eye in different XY planes.

[0036] Figure 3 shows the determination of an eye geometry and / or an eye rotation using a second photodiode. R.414162

[0037] - 8 -

[0038] Figures 4a and 4b show the determination of an eye geometry and / or a rotation of the eye as a function of the reflection signal of the laser beam detected by means of the photodiode.

[0039] Description of the exemplary implementations

[0040] Figure 1a shows, using a flowchart, a method for determining the distance between an eye, in particular the pupil of the eye, and a spectacle lens, especially one located in front of the eye in the direction of gaze. In a process step 110, a laser beam is emitted by means of a first laser diode. In a subsequent process step 120, the laser beam is scanned by means of at least one micromirror across a first holographic optical element arranged in or on a first area of ​​a spectacle lens. During scanning, in particular during a scan pass, the laser beam strikes the first holographic optical element at different times and at different points of impact. In a subsequent process step 130, the laser beam is redirected towards the user's eye by means of the first holographic optical element.In a further process step 140, at least one laser beam, emitted at a first time, striking the first holographic optical element at a first point of impact and reflected by the eye, in particular by a cornea or sclera of the eye, is detected by means of a first photodiode. In a subsequent process step 160, a first position of the eye, in particular the pupil of the eye, is determined in an XY plane, in particular one that is essentially parallel to the plane of the spectacle lens. The XY plane is in particular an XY plane at an arbitrary distance from the spectacle lens.In a further process step 200, the first XY plane in which the eye, in particular the pupil of the eye, is positioned with the previously determined first position of the eye is determined by means of an assignment of the detected first point of impact and a first XY plane to be determined, in particular in a first lookup table, stored in a memory unit. In a subsequent process step 210, the distance of the eye, in particular the pupil of the eye, to the spectacle lens is determined as a function of the determined first XY plane by means of the processing unit. The process is then terminated. R.414162.

[0041] - 9 -

[0042] Optionally, the distance of the first XY plane to the spectacle lens is also stored in the memory unit, especially in the first look-up table.

[0043] Optionally, for the first position of the eye in the XY plane, which is arbitrarily spaced from the spectacle lens, a first assignment of the different points of impact of the laser beams and the first XY plane to be determined is stored by the processing unit. Furthermore, for a second position of the eye in the XY plane that differs from the first, a second assignment of the different points of impact of the laser beams and a second XY plane to be determined, in which the eye, in particular the pupil of the eye, is positioned with the second position of the eye, is stored by the storage unit, in particular in a second look-up table.

[0044] In an optional process step 150 following process step 140, a reflection signal, in particular an intensity of the reflected laser beam, is determined by the processing unit as a function of the detected, reflected laser beam. Furthermore, the respective point of impact of the detected laser beam on the first holographic optical element is determined by the processing unit as a function of the reflection signal, in particular a temporal profile of the reflection signal. In an optional process step 170 following process step 160, a geometry of the eye and / or a rotation of the eye about an axis of rotation of the eye in the XY plane, in particular at an arbitrary distance from the spectacle lens, is determined by the processing unit as a function of the reflection signal. The first XY plane is then determined in the optional process step 190 using the parameters for the first position of the eye in the XY plane.in particular, the assignment of the first point of impact and the first XY plane to be determined is determined at any distance from the spectacle lens, and for the respective determined geometry of the eye and / or rotation of the eye, the assignment is stored.

[0045] In an optional process step 123, the laser beam is additionally scanned via a second holographic optical element arranged in or on a second area, in particular a central area, of a spectacle lens (R.414162).

[0046] - 10 - In the following process step 126, the laser beam is redirected towards the eye by means of the second holographic optical element in such a way that an image is projected into the eye.

[0047] In an optional process step 155, information about the initial position of the eye, in particular the pupil of the eye, in the XY plane, which is arbitrarily spaced from the spectacle lens, is acquired by means of an eye tracker. The eye tracker is in particular a laser feedback interferometer sensor or a camera unit.

[0048] Figure 1b shows, by means of a flowchart, a second method for determining the distance between an eye, in particular the pupil of the eye, and a spectacle lens, which is located in front of the eye, particularly in the direction of gaze. In contrast to the method in Figure 1a, an optional method step 152 for determining the distance between the eye and the spectacle lens assumes a spherical eye, and in particular an elliptical pupil with a principal plane of extension in the XY plane, which is arbitrarily spaced from the spectacle lens.

[0049] Figure 1c shows, by means of a flowchart, a third method for determining the distance between an eye, in particular a pupil of the eye, and a spectacle lens, in particular one located in front of the eye in the direction of gaze. In contrast to the methods described above, in an optional method step 156 following method step 140, at least one laser beam, emitted at a second time point following the first, striking the first holographic optical element at a second point of impact and reflected by the eye, in particular a cornea or a sclera of the eye, is detected by means of a second photodiode.In an optional process step 171 following process step 160, a geometry of the eye, in particular a geometry of the pupil, and / or a rotation of the eye about a rotation axis of the eye in the XY plane, in particular arbitrarily spaced from the spectacle lens, is determined as a function of an assignment of the points of impact of the laser beams emitted and detected at the different times and the geometry of the eye to be determined, in particular in a third look-up table.

[0050] - 11 -

[0051] The rotation of the eye around the rotation axis of the eye is determined. The first XY plane is then determined in the optional process step 191 by means of the assignment of the points of impact of the laser beams emitted and detected at the different times and the first XY plane to be determined, which is stored for the position of the eye in the XY plane, in particular at any distance from the spectacle lens, and for the respective determined geometry of the eye and / or rotation of the eye.

[0052] Figure 2a schematically shows a first embodiment of an optical system 3a in the form of data glasses, shown here partially for simplification, for a first position of the eye 1a in an XY plane, in particular arbitrarily spaced from the spectacle lens 6.

[0053] Optical system 3a comprises a first laser diode 16 for emitting a laser beam 21. Furthermore, the optical system comprises a first holographic optical element 20b, in this case located in a first region of a spectacle lens 6. The first region of the spectacle lens 6 is located in an outer area, specifically within a principal plane of extension, of the spectacle lens 6. Optical system 3a also includes a micromirror 15 for scanning the laser beam 21 across the first holographic optical element 20b. During scanning, the laser beam 21 strikes the holographic optical element 20b at different times and at different points of impact 32 and 33.Furthermore, the optical system comprises a first photodiode 35, which is configured to detect the at least one laser beam emitted at a first time, striking the first holographic optical element 20b with a first point of impact 32, and reflected by the eye 1a, in particular by a cornea or sclera of the eye. The optical system 3a also comprises a storage unit 18 for assigning the detected first point of impact 32 and the first XY plane 50a to be determined for the first position of the eye 1a in the XY plane, in particular at an arbitrary distance from the spectacle lens, in particular in a first look-up table. The optical system 3a further comprises a computing unit 17 for determining a distance 24a of the eye 1a, in particular a pupil 2 of the eye 1a, to the spectacle lens 6. The computing unit 17 is designed in this context to perform R.414162.

[0054] - 12 - formed, to receive a reflection signal of the reflected laser beam 22 detected by the first photodiode 35. Furthermore, the processing unit serves

[0055] 17 is configured to determine the first position of eye 1a, in particular the pupil 2 of eye 1a, in the XY plane, which is arbitrarily spaced from the spectacle lens 6. Furthermore, the computing unit 17 is configured to store a first XY plane 50a, in which eye 1a, in particular the pupil 2, is positioned with its first position, in particular the current position, by means of a first look-up table in the storage unit.

[0056] The processing unit 17 is used to determine the assignment of the detected first point of impact 32 and the first XY plane 50a to be determined. Furthermore, the processing unit 17 serves to determine the distance 24 of the eye 1a, in particular the pupil 2, to the spectacle lens 6 as a function of the determined first XY plane 50a. In this case, the distance 24 of the first XY plane 50a to the spectacle lens 6 also corresponds to the distance of the pupil 2 to the spectacle lens 6.

[0057] In this embodiment, the first laser diode 16, the micromirror 15, the computing unit 17, the first photodiode 35, and the computing unit 18 are integrated into a microprojector 9. The microprojector 9 is in turn integrated into a spectacle arm 8, so that the first photodiode 35 is arranged laterally next to the eye 1a.

[0058] Furthermore, a second holographic optical element 20 is arranged in a second area in the central region of the spectacle lens 6. A laser beam 30 is also scanned via this second holographic optical element 20 and then directed towards the eye 1a, in particular the pupil 2, in such a way that an image is projected into the eye 1a.

[0059] Furthermore, the optical system 3a has an eye tracker 60 for recording information about the first position of the eye 1 a, in particular the pupil of the eye 1 a, in the XY plane, in particular arbitrarily spaced from the spectacle lens 6.

[0060] Figure 2b schematically shows the first embodiment of an optical system 3a for a second position 40 in an XY plane, in particular arbitrarily spaced from the spectacle lens 6, and a plane opposite the second position 40. R.414162

[0061] - 13 - different third position 41 of eye 1 a in an XY plane, in particular arbitrarily spaced from the spectacle lens 6. The second 40 and third positions 41 are spaced apart from each other by a distance 49 in the X-direction. The laser beam 37 reflected from eye 1 a with the point of impact 34 is detected at both positions 40 and 41 by means of the first photodiode 35. However, for the second position 40 and the first point of impact 34, the second XY plane 50b is defined at a distance 24b from the spectacle lens 6, and for the third position 41 and the first point of impact 34, the third XY plane 50c is defined at a distance 24c from the spectacle lens 6. Furthermore, the distance 49 in the X-direction, determined in particular by means of an eye tracker (not shown here), helps to distinguish between the second position 40 and the third position 41.In this case as well, the distance 24b of the second XY plane 50b to the spectacle lens 6 corresponds to the distance of the pupil 2 to the spectacle lens 6. The distance 24c of the third XY plane 50c to the spectacle lens 6 also corresponds to the distance of the pupil 2 to the spectacle lens 6.

[0062] To determine the distance 24b of the second XY plane 50b to the spectacle lens 6 and the distance 24c of the third XY plane 50c to the spectacle lens 6, a spherical eye 1a and an elliptical pupil 2 are assumed.

[0063] Figure 3 schematically shows a section of a second embodiment of an optical system 3b in the form of data glasses. As can be seen in Figure 3, due to, among other things, different eye rotations, the first photodiode 35 can detect the laser beam 39 for the fourth position 42 of the eyes 1b and 1c, which are spaced differently from the lens. Since the X-positions of the pupils 4a and 4b are the same, differentiation solely via the first photodiode 35 is therefore difficult, unless the measurement of the ellipticity of the pupil 4a is very precise.In this context, the optical system 3b, in contrast to the first embodiment shown in Figures 2a and 2b, additionally has a second photodiode 36, which is configured to emit at least one La- R.414162 at a second time point following the first, which strikes the first holographic optical element with a second point of impact and is reflected by the eye, in particular a cornea or a sclera of the eye.

[0064] - 14 - laser beam 38. In this context, the processing unit 17 is configured to determine a geometry of the eye 1b and 1c, in particular a geometry of the pupil 4a and 4b, depending on an assignment of the points of impact of the laser beams 39 and 38 emitted and detected at the different times, and the geometry of the eye to be determined, which is stored in a second look-up table. Alternatively or additionally, the processing unit 17 is configured to determine a rotation of the eye 1b and 1c about a rotation axis of the eye 1b and 1c (not shown here) in the XY plane, depending on an assignment of the points of impact of the laser beams 39 and 38 emitted and detected at the different times, which is stored in a second look-up table, and the rotation of the eye about the rotation axis of the eye 1b and 1c.Furthermore, the computing unit 17 is designed to determine the first XY plane 50d or 50e by means of the assignment of the points of impact of the laser beams 39 and 38 emitted and detected at the different times and the first XY plane 50d or 50e to be determined, which is stored for the position of the eye 42 in the XY plane and for the respective determined geometry of the eye 1 b and 1 c and / or rotation of the eye 1 b and 1 c.

[0065] Figure 4a shows a similar case to Figure 3a, except that the first photodiode 35 is present. Here too, the rotation of eye 1e or pupil 4e is such that the first photodiode 35 detects the laser beam 47 for both eye 1d or pupil 4d and eye 1e. The laser beam 48 is not detected by the first photodiode for either eye position, 1d or 1e. Figure 4b shows the corresponding measurement profile of the laser beam 47 reflected by eye 1e at the top. The intensity of the reflection signal 52 is shown on the Y-axis 51a, and the scan angle of the laser beam 47 is shown on the X-axis 51b. The corresponding measurement profile of the laser beam 47 reflected by eye 1d is shown at the bottom of Figure 4b. The intensity of the reflection signal 55 is shown on the Y-axis 54a and the scan angle of the laser beam 47 is shown on the X-axis 54b.Due to the higher angle of incidence of the laser beam reflected by eye 1e compared to the laser beam reflected by eye 1d into the first photodiode 35, the reflection signal 52 at peak 53 has a lower intensity than the reflection signal 55 at peak 56. The curve of the reflection signal 55 is also wider (R.414162).

[0066] - 15 - formed as the curve of the reflection signal 52, since the local slope at the eye is lower. By comparison with reflection signals stored in another look-up table, in particular the time course of reflection signals, the geometry of the eye 1 d and 1 e and / or a rotation of the eye 1 d and 1 e about a rotation axis of the eye is determined by means of the processing unit not shown here.

Claims

R.414162 - 16 - Claims 1. Method for determining a distance (24a) of an eye (1a, 1b, 1c, 1 d, 1 e), in particular a pupil (2, 4a, 4b, 4d, 4e) of the eye (1 a, 1 b, 1 c, 1 d, 1 e), to a spectacle lens (6) located in particular in the direction of gaze in front of the eye (1 a, 1 b, 1 c, 1 d, 1 e), in particular in a Z-direction, wherein the method comprises the following process steps, - Emitting (110) a laser beam (21) by means of a first laser diode, and - Scanning (120) the laser beam (21 , 38, 39, 47, 48) by means of at least one micromirror (15) over a first holographic optical element (20b) arranged in or on a first area of ​​a spectacle lens (6), wherein the laser beam (21 , 38, 39, 47, 48) strikes the first holographic optical element (20b) at different times with different points of impact (32, 33, 34) during scanning, in particular during a scan cycle, and - Redirecting (130) the laser beam (21 , 38, 39, 47, 48) towards the user's eye (1 a, 1 b, 1 c, 1 d, 1 e) by means of the first holographic optical element (20b), and - Detection (140) of at least one laser beam (22, 37) emitted at a first time, striking the first holographic optical element (20b) with a first point of impact (32) and reflected by the eye (1 a, 1 b, 1 c, 1 d, 1 e), in particular a cornea or a sclera of the eye (1 a, 1 b, 1 c, 1 d, 1 e), by means of a first photodiode (35), and - Determining (160) a, in particular current, first position of the eye (1 a, 1 b, 1 c, 1 d, 1 e), in particular of the pupil (2, 4a, 4b, 4d, 4e) of the eye (1 a, 1 b, 1 c, 1 d, 1 e), in an XY plane, in particular running substantially parallel to the plane of the spectacle lens (6), and furthermore in particular arbitrarily spaced from the spectacle lens (6). - Determining a first XY plane (50a) in which the eye (1 a, 1 b, 1 c, 1 d, 1 e), in particular the pupil (2, 4a, 4b, 4d, 4e) of the eye (1 a, 1 b, 1 c, R.414162 - 17 - 1 d, 1 e), with the first position of the eye (1 a, 1 b, 1 c, 1 d, 1 e), in particular currently, is positioned, by means of an assignment of the detected first point of impact (32) and the first XY plane to be determined (50a) stored in a memory unit (18), in particular in a first look-up table, and - Determining the distance (24a) of the eye (1 a, 1 b, 1 c, 1 d, 1 e), in particular the pupil (2, 4a, 4b, 4d, 4e) of the eye (1 a, 1 b, 1 c, 1 d, 1 e), to the spectacle lens (6) as a function of the determined first XY plane (50a) using a computing unit (167).

2. Method according to claim 1, characterized in that, for the first position of the eye (1a, 1b, 1c, 1d, 1e) in the XY plane, which is spaced at an arbitrary distance from the spectacle lens (6), a first assignment of the different points of impact (32, 33, 34) of the laser beams (21, 38, 39, 47, 48) and the first XY plane (50a) to be determined is performed, and for a second position (40) of the eye (1a, 1b, 1c, 1d, 1e) in the XY plane, which is different from the first position, a second assignment, which is different from the first, in particular in a second look-up table, of the different points of impact (32, 33, 34) of the laser beams (21, 38, 39, 47, 48) and a second XY plane to be determined is performed. (50b), in which the eye (1 a, 1 b, 1 c, 1 d, 1 e), in particular the pupil (2, 4a, 4b, 4d, 4e) of the eye (1 a, 1 b, 1 c, 1 d, 1 e), is positioned with the second position (50b) of the eye, are stored by means of the storage unit (18).

3. Method according to one of claims 1 or 2, characterized in that a reflection signal (52, 55), in particular an intensity of the reflected laser beam (22, 37), is determined (150) by means of the computing unit (17) depending on the detected, reflected laser beam (22, 37), and that the respective point of impact (32, 33, 34) of the detected laser beam (22, 37) on the first holographic optical element (20b) is determined by means of the computing unit (17) depending on the reflection signal (52, 55), in particular a temporal profile of the reflection signal (52, 55). R.414162 - 18 - 4. Method according to claim 3, characterized in that, in addition, a geometry of the eye is determined depending on the reflection signal (52, 55). (1 a, 1 b, 1 c, 1 d, 1 e) and / or a rotation of the eye (1 a, 1 b, 1 c, 1 d, 1 e) about an axis of rotation of the eye (1 a, 1 b, 1 c, 1 d, 1 e) in the XY plane, in particular arbitrarily spaced from the spectacle lens (6), is determined (170) by means of the computing unit (17), and that the first XY plane (50a) is determined by means of the geometry of the eye (1 a, 1 b, 1 c, 1 d, 1 e) for the first position of the eye (1 a, 1 b, 1 c, 1 d, 1 e) in the XY plane, in particular arbitrarily spaced from the spectacle lens (6), and for the respective determined geometry of the eye (1 a, 1 b, 1 c, 1 d, 1 e) and / or rotation of the eye (1 a, 1 b, 1 c, 1 d, 1 e) The stored assignment of the first point of impact (32) and the first XY level to be determined (50a) is determined (190).

5. Method according to one of claims 1 to 3, characterized in that, for determining the distance (24a) of the eye (1 a, 1 b, 1 c, 1 d, 1 e) to the spectacle lens (6), a spherical eye (1 a, 1 b, 1 c, 1 d, 1 e), and in particular an elliptical pupil (2, 4a, 4b, 4d, 4e) with a principal extension plane in the XY plane, in particular arbitrarily spaced from the spectacle lens (6), is assumed (152).

6. A method according to any one of claims 1 to 3, characterized in that the method comprises the following further process steps: - Detection (156) of at least one laser beam (22, 37) emitted at a second time point following the first, striking the first holographic optical element (20b) with a second point of impact (33) and reflected by the eye (1a, 1b, 1c, 1d, 1e), in particular a cornea or a sclera of the eye (1a, 1b, 1c, 1d, 1e), by means of a second photodiode (36), and - Determination (171) of a geometry of the eye (1a, 1b, 1c, 1d, 1e), in particular a geometry of the pupil (2, 4a, 4b, 4d, 4e), and / or a rotation of the eye (1a, 1b, 1c, 1d, 1e) about an axis of rotation of the eye (1a, 1b, 1c, 1 d, 1 e) in the XY plane, in particular arbitrarily spaced from the spectacle lens (6), depending on an assignment of the impact points (32, 33, 34) of the emitted and detected at the different times, in particular in a third look-up table. R.414162 - 19 - laser beams (22, 37) and the geometry of the eye to be determined (1 a, 1 b, 1 c, 1 d, 1 e) and / or rotation of the eye (1 a, 1 b, 1 c, 1 d, 1 e) about the axis of rotation of the eye (1 a, 1 b, 1 c, 1 d, 1 e), and - Determining (191) the first XY plane (50a) by means of the assignment of the points of impact (32, 33, 34) of the laser beams emitted and detected at the different times (22, 37) and the first XY plane (50a) to be determined, which is stored for the position of the eye (1 a, 1 b, 1 c, 1 d, 1 e) in the XY plane, in particular arbitrarily spaced from the spectacle lens (6) and for the respective determined geometry of the eye (1 a, 1 b, 1 c, 1 d, 1 e) and / or rotation of the eye (1 a, 1 b, 1 c, 1 d, 1 e).

7. Method according to one of claims 1 to 6, characterized in that information about the first position of the eye (1 a, 1 b, 1 c, 1 d, 1 e), in particular the pupil (2, 4a, 4b, 4d, 4e) of the eye (1 a, 1 b, 1 c, 1 d, 1 e), in the XY plane, in particular arbitrarily spaced from the spectacle lens (6), is acquired (155) by means of an eye tracker (60), in particular a laser feedback interferometer sensor or a camera unit.

8. Method according to one of claims 1 to 7, characterized in that the first area of ​​the spectacle lens (6) is arranged in an outer area, in particular within a principal extension plane, of the spectacle lens (6).

9. A method according to any one of claims 1 to 8, characterized in that the method comprises the following additional process steps: - Scanning (123) of the laser beam (21 , 38, 39, 47, 48) additionally via a second holographic optical element (20) arranged in or on a second area, in particular central area, of the spectacle lens (6), and - Redirecting (126) the laser beam (21 , 38, 39, 47, 48) by means of the second holographic optical element (20) towards the eye (1 a, 1 b, 1 c, 1 d, 1 e) such that an image is projected into the eye (1 a, 1 b, 1 c, 1 d, 1 e). R.414162 - 20 - 10. Method according to one of claims 1 to 9, characterized in that the distance (24) of the first XY plane (50a) to the spectacle lens (6) is also stored in the storage unit (18), in particular in the first look-up table.

11. Computing unit (17) for determining a distance (24) of an eye (1 a, 1 b, 1 c, 1 d, 1 e), in particular a pupil (2, 4a, 4b, 4d, 4e) of the eye (1 a, 1 b, 1 c, 1 d, 1 e), to a spectacle lens (6) lying in front of the eye (1 a, 1 b, 1 c, 1 d, 1 e), particularly in a Z-direction, wherein the computing unit (17) is configured in particular to carry out a method according to one of claims 1 to 10, wherein the computing unit (17) is configured - to receive a reflection signal (52, 55) of a first holographic optical element (20b) emitted at a first time point, which is arranged in or on a first area of ​​a spectacle lens (6) and strikes a first point of impact (32), is reflected by an eye (1 a, 1 b, 1 c, 1 d, 1 e), in particular a cornea or a sclera of the eye (1 a, 1 b, 1 c, 1 d, 1 e), and is detected by means of a first photodiode (35), and - to determine, in particular, the current, first position of the eye (1 a, 1 b, 1 c, 1 d, 1 e), in particular the pupil (2, 4a, 4b, 4c, 4d) of the eye (1 a, 1 b, 1 c, 1 d, 1 e), in an XY plane, in particular running substantially parallel to a plane of a spectacle lens (6), and furthermore in particular arbitrarily spaced from the spectacle lens (6), and - to determine a first XY plane (50a) in which the eye (1a, 1b, 1c, 1d, 1e), in particular the pupil (2, 4a, 4b, 4d, 4e) of the eye (1a, 1b, 1c, 1d, 1e), is positioned with the first position of the eye (1a, 1b, 1c, 1d, 1e), in particular the current position, by means of an assignment of the detected first point of impact (32) and the first XY plane (50a) to be determined, in particular in a first look-up table, stored in a memory unit (18), and - to determine a distance (24) of the eye (1 a, 1 b, 1 c, 1 d, 1 e), in particular the pupil (2, 4a, 4b, 4d, 4e) of the eye (1 a, 1 b, 1 c, 1 d, 1 e), to the spectacle lens (6) depending on the determined first XY plane (50a). R.414162 - 21 - 12. Optical system (3a, 3b), comprising at least - a first laser diode (35) for emitting a laser beam (21 , 38, 39, 47, 48), - a first holographic optical element (20b) arranged in or on a first area of ​​a spectacle lens (6), - a micromirror (15) for scanning the laser beam (21 , 38, 39, 47, 48) across the first holographic optical element (20b), wherein the laser beam (21 , 38, 39, 47, 48) strikes the holographic optical element (20b) at different times with different points of impact (32, 33, 34) during scanning, and - a first photodiode (35) which is configured to detect at least one laser beam (22, 37) emitted at a first time point, striking the first holographic optical element (20b) with a first point of impact (32) and reflected by the eye (1 a, 1 b, 1 c, 1 d, 1 e), in particular a cornea or a sclera of the eye (1 a, 1 b, 1 c, 1 d, 1 e), and - a storage unit (18) for the assignment of the detected first point of impact (32, 33, 34) and the first XY plane (50a) to be determined, stored for the first position of the eye (1 a, 1 b, 1 c, 1 d, 1 e) in the XY plane, in particular arbitrarily spaced from the spectacle lens (6), in particular in a first look-up table, and - a computing unit (17) according to claim 11 .

13. Optical system (3a, 3b) according to claim 12, characterized in that the optical system (3a, 3b) additionally comprises a second photodiode (36) which is configured to detect at least one laser beam (22, 37) emitted at a second time point following the first, striking the first holographic optical element (20b) with a second point of impact (33) and reflected by the eye (1a, 1b, 1c, 1d, 1e), in particular a cornea or a sclera of the eye (1a, 1b, 1c, 1d, 1e), wherein the computing unit (17) is configured to - a geometry of the eye (1 a, 1 b, 1 c, 1 d, 1 e), in particular a geometry of the pupil (2, 4a, 4b, 4d, 4e), and / or a rotation of the eye (1 a, 1 b, 1 c, 1 d, 1 e) about a rotation axis of the eye (1 a, 1 b, 1 c, 1 d, R.414162 - 22 - 1 e) in the XY plane depending on a stored assignment, in particular in a second look-up table, of the points of impact (32, 33, 34) of the laser beams (22, 37) emitted and detected at the different times and of the geometry of the eye (1 a, 1 b, 1 c, 1 d, 1 e) and / or rotation of the eye (1 a, 1 b, 1 c, 1 d, 1 e) to be determined about the rotation axis of the eye (1 a, 1 b, 1 c, 1 d, 1 e), and - to determine the first XY plane (50a) by means of the assignment of the impact points (32, 33, 34) of the laser beams (22, 37) emitted and detected at the different times and the first XY plane (50a) to be determined, which is stored for the position of the eye (1 a, 1 b, 1 c, 1 d, 1 e) in the XY plane and for the respective determined geometry of the eye (1 a, 1 b, 1 c, 1 d, 1 e) and / or rotation of the eye (1 a, 1 b, 1 c, 1 d, 1 e).

14. Optical system (3a, 3b) according to claim 13, characterized in that the optical system (3a, 3b) is designed as a data glasses.

15. Optical system (3a, 3b) according to one of claims 13 or 14, characterized in that the first photodiode (35), and in particular a second photodiode (36), is arranged laterally next to the eye (1a, 1b, 1c, 1d, 1e), in particular on a temple of glasses (8).

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