A full eye biometry system and a method of measuring thereof

Abstract

The application discloses a full eyeball biometry system and a measuring method thereof. The full eyeball biometry system comprises a light source, an eye axis measuring device and an aberration measuring device. The light source is used for emitting measuring light. The measuring light is incident on a measured eye after passing through the eye axis measuring device. Light reflected by the measured eye enters the eye axis measuring device and the aberration measuring device respectively. The eye axis measuring device is used for measuring the eye axis length of the measured eye. The aberration measuring device is used for measuring the aberration of the measured eye. The scheme combines the functions of eye axis measurement and aberration measurement, and can directly obtain full eyeball biometry parameters. The measurement result is more accurate and has high precision.

Description

Technical Field

[0001] This invention relates to the technical field of ocular data measurement, and in particular to a whole-eye biometric system and its measurement method. Background Technology

[0002] The myopia rate among children and adolescents in my country remains high, with myopia occurring at increasingly younger ages and becoming more severe. Increased eye strain leads to fatigue of the ciliary muscles in the eyes, causing the axial length of the eye to develop too early and too quickly, resulting in refractive errors.

[0003] Currently used ordinary myopia correction lenses, while focusing light onto the retina in the center of the eye, cause the peripheral focus to be behind the retina, resulting in overcorrection of myopia in the peripheral areas. Research has found that the development of myopia is related to peripheral hyperopia; the peripheral retinal image appearing behind the retina can stimulate a gradual increase in the axial length of the eye, leading to a gradual increase in the degree of myopia.

[0004] Currently, devices both domestically and internationally capable of detecting retinal defocus all operate on the principle of acquiring images at 0 degrees from the retinal center. By acquiring fundus images at different depths, they then use algorithms to calculate the peripheral defocus. Therefore, these devices cannot directly measure peripheral defocus and only include refractive error and astigmatism information, excluding higher-order aberrations, resulting in incomplete aberration information. Summary of the Invention

[0005] In view of this, this application provides a whole-eye biometry system and method that can simultaneously measure parameters such as axial length and aberrations.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A whole-eye biometry system, comprising:

[0008] The device includes a light source, an axial length measuring device, and an aberration measuring device. The light source emits measuring light, which passes through the axial length measuring device and then enters the eye being tested. The light reflected from the eye being tested enters the axial length measuring device and the aberration measuring device, respectively. The axial length measuring device measures the axial length of the eye being tested, and the aberration measuring device measures the aberrations of the eye being tested.

[0009] Preferably, in the above-described whole-eye biometric system, the axial length measuring device includes: a first beam splitter, a second beam splitter, a fixed reflector, a movable reflector, and a detection device; a portion of the measuring light after passing through the first beam splitter is incident on the fixed reflector, and another portion is incident on the movable reflector; the light beams emitted from the fixed reflector and the movable reflector are combined and then incident on the tested eye through the second beam splitter; the light reflected from the tested eye is received by the detection device after passing through the second beam splitter; the distance between the movable reflector and the first beam splitter is adjustable.

[0010] Preferably, in the above-described whole-eye biometry system, the emitted light from the fixed reflector is parallel to or coincides with the incident light, and the emitted light from the movable reflector is parallel to or coincides with the incident light.

[0011] Preferably, in the above-described whole-eye biometric system, the aberration measurement device includes a filter and a wavefront sensor; the light reflected from the eye being tested first enters the filter and is filtered, and then incident on the wavefront sensor, and the aberration of the eye being tested is obtained by the signal received by the wavefront sensor.

[0012] Preferably, in the above-described whole-eye biometric system, the whole-eye biometric system further includes: a third beam splitter; a portion of the light reflected from the eye being measured enters the aberration measuring device after passing through the third beam splitter, and the other portion returns to the axial length measuring device.

[0013] Preferably, in the above-described whole-eye biometry system, the whole-eye biometry system is mounted on a rotating device, which is used to drive the measuring light incident on the eye being tested to rotate around the center of the pupil of the eye being tested.

[0014] Preferably, in the above-described whole-eye biometric system, the whole-eye biometric system further includes: a fixation device, which is used to provide fixation targets to the tested eye to guide the tested eye to fixate.

[0015] The present invention also provides a measurement method for the whole-eye biometry system as described in any of the preceding claims, the measurement method comprising:

[0016] The measuring light emitted from the light source passes through the axial length measuring device and then enters the eye being measured. Part of the light reflected by the eye enters the aberration measuring device for wavefront aberration measurement, while the other part returns to the axial length measuring device for axial length measurement.

[0017] Preferably, in the above measurement method, the measurement method further includes: changing the angle at which the measurement light is incident on the eye being measured to obtain the axial length and aberration at different angles.

[0018] Preferably, in the above measurement method, the axial length is measured using an axial length measuring device comprising: a beam splitter, a fixed reflector, a movable reflector, and a detector. A portion of the measuring light, after passing through the beam splitter, is incident on the fixed reflector, and another portion is incident on the movable reflector. The axial length measurement specifically includes:

[0019] When the light reflected by the eye being tested reaches the fixed reflector and the movable reflector with equal optical path lengths, the detection device obtains a first interference signal and acquires the first position of the movable reflector.

[0020] The movable reflector is moved along the optical path, and when the detection device obtains the second interference signal, the second position of the movable reflector is acquired.

[0021] The distance between the first position and the second position is obtained as the axial length.

[0022] As described above, the whole-eye biometry system and method provided by this invention simultaneously measure the eye using an axial length measuring device and an aberration measuring device. This allows for simultaneous measurement of axial length, refractive error, and other low- and high-order aberrations such as coma, astigmatism, field curvature, distortion, and chromatic aberration, improving measurement speed and saving significant time for vision screening. Furthermore, the aberration measuring device and the axial length measuring device share hardware, further reducing costs. Moreover, the whole-eye biometry system of this invention can directly measure the parameters of the entire eye, resulting in more accurate and precise measurements. Based on these parameters, whole-eye biomodeling can be performed, and precise guidance for lens fitting can be provided based on peripheral retinal defocus and axial length data. After lens fitting, the whole-eye biometry system of this invention can be used to monitor eye parameters and track the effectiveness of the lens fitting. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0024] The structures, proportions, sizes, etc., shown in the accompanying drawings are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the implementation conditions of this application. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size should still fall within the scope of the technical content disclosed in this application, provided that they do not affect the effects and purposes that this application can produce.

[0025] Figure 1 This is a schematic diagram of the optical path of a whole-eye biometry system provided in an embodiment of the present invention;

[0026] Figure 2 A schematic diagram of the state of the rotating device provided in an embodiment of the present invention;

[0027] Figure 3 This is a schematic diagram of another state of the rotating device provided in an embodiment of the present invention;

[0028] Figure 4 This is a schematic diagram of light rays from different angles for the rotating device provided in an embodiment of the present invention;

[0029] Figure 5 This is a schematic diagram of the optical path of another whole-eye biometry system provided in an embodiment of the present invention. Detailed Implementation

[0030] The embodiments of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0031] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] In addition to measuring axial length, refractive error, and higher-order aberrations (such as coma, astigmatism, field curvature, distortion, and chromatic aberration), this invention can also simultaneously measure peripheral defocus, peripheral axial length (the axial length of the peripheral retina outside the fovea), and peripheral higher-order aberrations. Of course, depending on actual needs, only one or more of these parameters can be measured.

[0033] refer to Figure 1 , Figure 1 This is a schematic diagram of the optical path of a whole-eye biometry system provided in an embodiment of the present invention. Figure 1As shown, the whole-eye biometry system includes:

[0034] The device includes a light source 4, an axial length measuring device 2, and an aberration measuring device 3. The light source 4 emits measuring light, which passes through the axial length measuring device 2 and is incident on the eye being tested 23. The light reflected by the eye being tested 23 enters the axial length measuring device 2 and the aberration measuring device 3, respectively. The axial length measuring device 2 is used to measure the axial length of the eye being tested 23, and the aberration measuring device 3 is used to measure the aberrations of the eye being tested 23.

[0035] It should be noted that the eye 23 mentioned in this invention can be a human eye, or an animal eye, a simulated eye, or other types of eyeballs. The following description will use a human eye as an example.

[0036] In this embodiment of the invention, the axial length measuring device 2 includes: a first beam splitter 9, a second beam splitter 12, a fixed reflector 10, a movable reflector 11, and a detection device 15. A portion of the measuring light after passing through the first beam splitter 9 is incident on the fixed reflector 10, and another portion is incident on the movable reflector 11. The light emitted from the fixed reflector 10 and the movable reflector 11 is combined and then incident on the tested eye 23 via the second beam splitter 12. The light reflected from the tested eye 23 is received by the detection device 15 after passing through the second beam splitter 12. The movable reflector 11 can move along the optical path to change the distance between the movable reflector 11 and the first beam splitter 9, thereby changing the optical path length reflected from the tested eye 23.

[0037] The emitted light from the fixed reflector 10 is parallel to or coincides with the incident light, and the emitted light from the movable reflector 11 is parallel to or coincides with the incident light.

[0038] It should be noted that the fixed reflecting device 10 can be a fixed reference arm, and the movable reflecting device 11 can be a movable reference arm, preferably a corner bevel prism, or other optical components or lens combinations, as long as they can make the incident light and the outgoing light parallel or coincident, such as a plane mirror; the outgoing light of the corner bevel prism is displaced relative to the incident light path, while the outgoing light of the plane mirror coincides with its incident light. Furthermore, the positions of the fixed reflecting device 10 and the movable reflecting device 11 on the optical path can be interchanged.

[0039] In this embodiment of the invention, the aberration measurement device 3 includes a filtering device and a wavefront sensor 60; the light reflected by the eye being tested 23 is first incident on the filtering device for filtering, and then incident on the wavefront sensor 60, and the aberration of the eye being tested 23 is obtained by the signal received by the wavefront sensor 60.

[0040] like Figure 1 As shown, the whole-eye biometry system further includes: a third beam splitter 16; a portion of the light reflected by the eye being tested 23 after passing through the third beam splitter 16 enters the aberration measuring device 3, and the other portion returns to the axial length measuring device 2.

[0041] like Figure 1 As shown, the whole-eye biometry system further includes: a collimating lens 5 and an aperture 6; the measuring light passes through the collimating lens 5 and the aperture 6 in sequence before entering the axial length measuring device 2.

[0042] In this embodiment of the invention, the light entering the tested eye 23 can be adjusted to incident at different angles relative to the visual axis, thereby focusing the light at different positions on the retina. The whole-eye biometry system is mounted on a rotating device, which drives the measuring light incident on the tested eye 23 to rotate around the pupil center of the tested eye 23. In this scheme, the axial length measuring device 2 and the aberration measuring device 3 can be used to simultaneously measure the tested eye 23, so as to achieve simultaneous measurement of the central axial length (the distance from the anterior surface of the cornea to the fovea of ​​the retina on the visual axis), the peripheral axial length (the axial length of the peripheral retinal region outside the fovea), and other low- and high-order aberrations such as refractive error, coma, astigmatism, field curvature, distortion, and chromatic aberration of the visual axis and its periphery. Of course, depending on actual needs, if only parameters such as the axial length or refractive power on the visual axis are required, then the rotating device is not necessary.

[0043] like Figure 2 and Figure 3 As shown, the rotating device includes a measuring head 24 and a turntable 25. The whole-eye biometry system is mounted on the measuring head 24. By rotating the turntable 25, the measuring head 24 is rotated, thereby causing the measuring light to rotate around the center of the pupil of the eye being measured 23.

[0044] like Figure 1 As shown, the whole-eye biometry system further includes a fixation device 30, which is used to provide fixation targets to the tested eye 23 to guide the tested eye 23 to fixate.

[0045] It should be noted that during measurement, the light must be incident from the center of the pupil, and the light emitted from the rotating measurement system must continuously revolve around the center of the pupil. In this embodiment, the rotation center of the light emitted from the measurement system is known beforehand. The subject's eye is then adjusted so that the pupil center coincides with the rotation center. This step can be done manually or by placing a camera in front of the system to acquire an image of the eye. An image-based algorithm identifies the pupil center, and a 3D motion device automatically adjusts the pupil center to the known rotation center before measurement is performed. During the measurement process, no further adjustment of the eye is required in this embodiment.

[0046] like Figure 2 As shown, when the turntable 25 rotates at an angle of 0°, Figure 1 The angle of incidence of light is 0°, meaning the axial length and aberrations (such as refractive power) of the tested eye are measured at 0°. Figure 4 The light in the image is 35.

[0047] like Figure 3 As shown, when turntable 25 rotates 30° to the left, Figure 1 The angle of incidence of light is -30°, meaning the axial length and aberrations (such as peripheral defocus) of the tested eye 23 are measured at -30°. Figure 4 Ray 36 intersects the visual axis at the center of the pupil. Similarly, the turntable 25 can rotate 30° to the right, i.e. Figure 1 The angle of incidence of the light is 30°, meaning the axial length and aberration of the tested eye 23 are measured at 30°. Figure 4 The light in the middle is 37.

[0048] In other methods, the eye 23 under test can be measured by rotating it at any angle within the range of -30° to 30°, and is not limited to the method described in this application. For example, by controlling the turntable 25, the peripheral axial length and peripheral defocus can be measured at different angles at intervals of 1° or 5°. The angle interval can be freely set, thereby measuring the central axial length and central refractive power of the eye 23 under test, as well as the peripheral axial length and peripheral defocus within the range of -30° to 30°. Of course, a larger angle range can also be achieved by controlling the turntable 25 to rotate at any angle greater than ±30°.

[0049] In this embodiment of the invention, the axial length measuring device 2 employs a dual-beam partially coherent measurement method. It is capable of measuring the axial length of the eye 23 being measured.

[0050] like Figure 1 As shown, the axial length measuring device 2 also includes: a quarter glass slide 13, a converging lens 14, and an aperture 33;

[0051] The measuring light emitted by the light source 4 is collimated by the collimating lens 5, and then the size of the light spot is changed by the variable aperture 6 to control the size of the light spot entering the tested eye 23, thereby controlling the light energy entering the eyeball to meet the requirements of laser safety for the human eye. Then, it is split into two equal parts by the first beam splitter 9. One part of the light is incident on the fixed reflector 10, and the other part is incident on the movable reflector 11. The light beams emitted from the fixed reflector 10 and the movable reflector 11 are combined and then incident on the second beam splitter 12. The light reflected by the beam splitter 12 is converted into circularly polarized light by the quarter-glass slide 13. This circularly polarized light passes unchanged through the third beam splitter 16 and the fixation device 30 before entering the eye being tested 23. A portion of the light reflected from the eye 23, after passing through the third beam splitter 16, enters the aberration measuring device 3, while the remaining portion is converted into circularly polarized light by the quarter-glass slide 13. This circularly polarized light then passes through the second beam splitter 12 and enters the converging lens 14. After being converged by the converging lens 14, it passes through the aperture 33 and is finally received by the detection device 15. The detection device 15 can be a photodetector (such as an APD or PMT).

[0052] When the fixed reflector 10, the movable reflector 11, and the first beam splitter 9 have the same optical path, an interference signal can be obtained on the detection device 15. Adjusting the movable reflector 11 to move a certain distance along the optical path—forward or backward depending on the actual situation—allows it to maintain the same optical path from the cornea to the retina of the tested eye 23, at which point an interference signal can be obtained again on the detection device 15. Based on the distance the movable reflector 11 has moved, the axial length of the tested eye 23 can be calculated. It should be noted that the movement of the movable reflector 11 can be manual or automatic, and the specific structure used to achieve the movement is not limited.

[0053] In this design, both the first beam-splitting device 9 and the third beam-splitting device 16 can be beam-splitting prisms with a splitting ratio of 50:50. The second beam-splitting device 12 can be a polarizing beam-splitting prism that transmits light while reflecting it, and in conjunction with a quarter-glass slide 13, it can achieve both transmission and reflection functions, with the quarter-glass slide 13 also enhancing the light intensity. In other designs, the combination of the second beam-splitting device 12 and the quarter-glass slide 13 can be replaced with similar optical components or lens combinations such as a semi-transparent, semi-reflective mirror, which can achieve partial transmission and partial reflection of light.

[0054] The light source 4 can be a superluminescent diode with a center wavelength of 840nm and a half-width at half-maximum of 30nm.

[0055] In this embodiment of the invention, the aberration measuring device 3 adopts the Hartmann-Shack wavefront aberration measurement method, which can measure the aberrations of the tested eye 23.

[0056] like Figure 1 As shown, the aberration measuring device 3 further includes: a bandwidth filter 20;

[0057] In this embodiment, the filtering device is a 4F filter device 50, including a first plano-convex lens 17, a pinhole aperture 18, and a second plano-convex lens 19. It should be noted that the specific components and structures constituting the 4F filter device 50 can be replaced with other implementations known in the art.

[0058] The wavefront sensor 60 includes a microlens array 21 and a camera 22.

[0059] In this process, the light reflected from the tested eye 23 is incident on the 4F filter device 50 via the third beam splitter 16. After passing through the first plano-convex lens 17, the second pinhole aperture 18, and the second plano-convex lens 19 to filter out most of the light reflected from the cornea of ​​the tested eye 23, the light is then incident on the focal plane of the microlens array 21 via the bandwidth filter 20. The light carrying wavefront information is imaged on the focal plane by each sub-lens of the microlens array 21. The camera 22 can acquire a dot pattern carrying wavefront information, and the aberration of the tested eye 23 can be calculated from the dot pattern on the camera 22.

[0060] In the 4F filtering device 50 of this scheme, the pinhole aperture 18 can filter out most of the light reflected from the cornea of ​​the human eye. The light then passes through a bandwidth filter 20 with a center wavelength of 840nm and is incident on the microlens array 21, its wavelength matching the wavelength of the light source. The camera 22 is placed on the focal plane of the microlens array 21. The aberrations of the tested eye 23 can be calculated from the dot plot on the camera 22, including the spherical lens, cylindrical lens, and axis of the tested eye 23, representing the degree of myopia or hyperopia, astigmatism, and the direction of astigmatism, respectively.

[0061] In this embodiment of the invention, the wavefront sensor 60 consists of a microlens array 21 and a camera 22, and measures the aberrations of the human eye using the principle of the Hartmann-Shack wavefront sensor. Alternatively, the wavefront sensor 60 can be replaced by other wavefront sensor structures in the prior art, such as curvature wavefront sensors or pyramidal wavefront sensors.

[0062] like Figure 1 As shown, the fixation device 30 includes: a fixation lamp 28 and a cold mirror 27;

[0063] The fixation lamp 28 can be an LED, which provides a fixation target to the tested eye 23 to guide its fixation. The fixation target is coaxial with the axial length measuring device 2, the aberration measuring device 3, and the visual axis of the tested eye 23. A fixation device 30 can be used to display a fixation target at infinity, simulating the eye looking at infinity, thereby relaxing the ciliary muscle and improving measurement accuracy. Therefore, the structure of the fixation device 30 is not limited to the above-described scheme. The fixation target is optically coupled to the axial length measuring device 2 and the aberration measuring device 3 by a cold mirror 27. The cold mirror 27 can be at an angle of 45° to the principal optical axis, allowing the measurement light to pass through and reflecting the visible light from the fixation lamp 28.

[0064] It should be noted that the position of the fixation device 30 in the optical path is not limited to... Figure 1 The position shown can be coupled to other positions in the optical path depending on the actual situation. Furthermore, this scheme involves the tested eye 23 keeping its gaze fixed on the fixation target while the measuring laser rotates around the pupil for measurement. Therefore, during the rotation of the measuring head 24, the fixation device 30 cannot rotate accordingly to ensure that the eye remains fixed on the fixation point during the measurement process.

[0065] like Figure 5 As shown, Figure 5 This is a schematic diagram of the optical path of another whole-eye biometry system provided in an embodiment of the present invention. In this method, the fixation device 30 is disposed between the light source 4 and the axial length measuring device 2. The fixation device 30 includes a fixation lamp 7 and a beam splitter cube 8. The fixation lamp 7 combines with the measuring light beam through the reflection of the beam splitter cube 8. The fixation lamp 7 can be an LED or a screen displaying a fixation pattern. The LED is used to provide a fixation target to the tested eye 23 to guide the tested eye 23 to fixate, and is coaxial with respect to the axial length measuring device 2, the aberration measuring device 3, and the visual axis of the tested eye 23. The fixation device 30 is optically coupled to the axial length measuring device 2 and the aberration measuring device 3 by the beam splitter cube 8. Other optical path principles are the same as described above and will not be repeated here.

[0066] The whole-eye biometry system of this invention greatly assists in the precise planning of ophthalmic surgeries (such as corneal ablation and lens implantation) by measuring retinal defocus and higher-order aberrations of the human eye, thereby improving surgical outcomes.

[0067] Based on the above embodiments, another embodiment of the present invention also provides a measurement method for the whole-eye biometry system as described in the above embodiments, such as... Figure 1 or Figure 5 As shown.

[0068] The measurement method includes:

[0069] The measuring light emitted from the light source 4 passes through the axial length measuring device 2 and then enters the eye being measured 23. Part of the light reflected by the eye being measured 23 enters the aberration measuring device 3 to measure wavefront aberration, while the other part of the light returns to the axial length measuring device 2 to measure axial length.

[0070] Furthermore, the measurement method also includes: changing the angle at which the measuring light is incident on the eye 23 being measured by rotating the device, obtaining the axial length at different angles using the axial length measuring device 2, and obtaining the aberration at different angles using the aberration measuring device 3.

[0071] In this embodiment of the invention, when the light reflected by the tested eye 23 reaches the fixed reflector 10 and the movable reflector 11 with equal optical path lengths, the detection device 15 obtains a first interference signal and acquires a first position of the movable reflector 11; the movable reflector 11 is moved along the optical path, and when the detection device 15 obtains a second interference signal, a second position of the movable reflector 11 is acquired; the distance between the first position and the second position is acquired as the axial length of the eye.

[0072] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A whole-eye biometry system, characterized in that, The whole-eye biometry system includes: a light source, an axial length measuring device, an aberration measuring device, and a third beam splitter. The light source emits measurement light, which, after passing through the axial length measuring device, enters the eye being tested. A portion of the light reflected from the eye, after passing through the third beam splitter, enters the aberration measuring device, while the remaining portion returns to the axial length measuring device. The whole-eye biometry system is mounted on a rotating device, aligning the center of the pupil of the eye being tested with the rotation center of the measurement light. The rotating device drives the measurement light incident on the eye being tested to revolve around the center of the pupil. The measuring beam rotates around the center of the pupil during measurement. The axial length measuring device is used to measure the central and peripheral axial lengths of the eye under test using a dual-beam partial coherence measurement method. The aberration measuring device is used to measure the visual axis and peripheral aberrations of the eye under test. The aberration measuring device includes a filtering device, a wavefront sensor, and a bandwidth filter. The light reflected from the eye under test first enters the filtering device for filtering. After filtering out most of the light reflected from the cornea, it passes through the bandwidth filter and then enters the wavefront sensor. The aberrations of the eye under test are obtained from the signal received by the wavefront sensor. The rotating device includes a measuring head and a turntable. The whole-eye biometry system is installed on the measuring head. The measuring head is rotated by rotating the turntable, so that the measuring light rotates around a rotation center that coincides with the center of the pupil of the eye being measured.

2. The whole-eye biometry system according to claim 1, characterized in that, The axial length measuring device includes: a first beam splitter, a second beam splitter, a fixed reflector, a movable reflector, and a detection device; a portion of the measuring light after passing through the first beam splitter is incident on the fixed reflector, and another portion is incident on the movable reflector; the light emitted from the fixed reflector and the movable reflector is combined and then incident on the eye being measured through the second beam splitter; the light reflected from the eye being measured is received by the detection device after passing through the second beam splitter; the distance between the movable reflector and the first beam splitter is adjustable.

3. The whole-eye biometry system according to claim 2, characterized in that, The emitted light from the fixed reflector is parallel to or coincides with the incident light, and the emitted light from the movable reflector is parallel to or coincides with the incident light.

4. The whole-eye biometry system according to claim 1, characterized in that, The whole-eye biometric system further includes a fixation device for providing fixation targets to the tested eye to guide the eye's fixation.

5. A measurement method for the whole-eye biometry system as described in claim 1, characterized in that, The measurement method includes: The measuring light emitted from the light source passes through the axial length measuring device and then enters the eye being tested. The rotating device drives the measuring light entering the eye to rotate around a rotation center that coincides with the center of the pupil of the eye being tested. The light reflected by the eye being tested passes through the third beam splitter, and part of it enters the aberration measuring device to measure the wavefront visual axis and peripheral aberrations of the eye being tested. The other part of the light returns to the axial length measuring device to measure the central and peripheral axial lengths of the eye being tested using a dual-beam partial coherence measurement method. In the aberration measurement device, the light reflected from the eye being measured first enters the filter device of the aberration measurement device for filtering. After filtering out most of the light reflected from the cornea, it passes through the bandwidth filter of the aberration measurement device and then enters the wavefront sensor of the aberration measurement device. The aberration of the eye being measured is obtained through the signal received by the wavefront sensor.

6. The measurement method according to claim 5, characterized in that, The measurement method further includes: changing the angle at which the measurement light is incident on the eye being measured to obtain the axial length and aberration at different angles.

7. The measurement method according to claim 6, characterized in that, The axial length measuring device includes: a fixed reflecting device, a movable reflecting device, and a detection device. A portion of the measuring light, after passing through the beam splitter, is incident on the fixed reflecting device, and another portion is incident on the movable reflecting device. The axial length measuring device specifically measures the axial length of the eye by: When the light reflected by the eye being tested reaches the fixed reflector and the movable reflector with equal optical path lengths, the detection device obtains a first interference signal and acquires the first position of the movable reflector. The movable reflector is moved along the optical path, and when the detection device obtains the second interference signal, the second position of the movable reflector is acquired. The distance between the first position and the second position is obtained as the axial length.

Images