CN219229840U - Image acquisition device and eye refraction distribution measuring equipment - Google Patents

Abstract

The utility model discloses an image acquisition device and eye refraction distribution measurement equipment, which are used for adjusting the state of an imaging system to an initial adjusting state according to the refraction condition of the fundus fovea of each tested person, and then controlling the imaging system to take the initial adjusting state as a starting point and take the scanning parameters to carry out refraction distribution measurement according to preset scanning parameters.

Description

Image acquisition device and eye refraction distribution measuring equipment

Technical Field

The utility model relates to the technical field of eye diopter measurement, in particular to an image acquisition device and eye diopter distribution measurement test equipment.

Background

The imaging area of the retina of the eye includes the macula and the peripheral area of the macula. The commonly known ametropia states (myopia and hyperopia) refer to the determination of the focus position of the eye on parallel light with reference to the macula, which is called myopia if the focus position is located before the macula of the retina and hyperopia if the focus position is located behind the macula of the retina. The refractive value measured at the macula is known as the ocular power. The refractive values measured for different locations of the peripheral region of the macula retinae are known as peripheral refractive and are irregularly distributed. FIG. 1 shows the refractive distribution results of different eyes measured in practice. Wherein the fovea value (the value within the small central circle) is the refractive value at the macula, which represents the ametropia state of the eye, positive for hyperopia, negative for myopia, and zero for positive.

For peripheral refraction measurement, techniques have been developed, including implementations employing a scanning technique. A problem with this technique is that the imaging system needs to perform a wide range of zoom scans during measurement in order to allow the refractive range of the different eyes to be measured to be within the zoom range. As shown in fig. 2, the eyes of different individuals A, B and C have different refractive ranges, and the zoom imaging system needs to cover A, B, C the refractive ranges of three eyes when performing zoom scanning (hereinafter referred to as scanning) imaging. Because the zoom scanning range is larger, the measuring system needs to take images for a long time, the eye position and the pupil size are required to be kept stable for a long time in the measuring process, and the eye can not blink, so that the requirement on the coordination degree of a subject is higher, and the measuring efficiency is low.

Disclosure of Invention

The utility model mainly aims at automatically adjusting the state of the imaging system to adjust the scanning range according to individual conditions when the refractive distribution measurement is carried out on different testees, thereby greatly shortening the time for measuring the refractive distribution of eyes and improving the measurement efficiency.

To achieve the above object, the present utility model provides an image acquisition apparatus including:

an imaging system is provided which includes an imaging system, comprises a first imaging lens group and at least one image collector;

a light source projection module; the method comprises the steps of,

the control device is used for acquiring a refractive value at the macula of the eye, controlling the imaging system to be in an initial adjusting state according to the refractive value, and controlling the imaging system to continuously perform state adjusting scanning by taking the initial adjusting state as a starting point so that the image collector acquires image sequences of different defocus degrees of the fundus; and obtaining the refractive distribution of the eye according to the image sequence.

Optionally, the light source projection module includes a first mode for projecting measurement light, and a second mode for projecting illumination light, wherein the measurement light is annular light, and the illumination light is surface light.

Optionally, the refractive value at the macula of the eye is determined in the first mode.

Optionally, the first imaging lens group comprises a zoom lens group, and the state adjustment scanning is used for adjusting the position of the at least one image collector and/or adjusting the focal length of the zoom lens group.

Optionally, the light source projection module includes a first annular lighting module and an adjusting diaphragm.

Optionally, the light source projection module includes:

the first light source module is used for projecting measurement light to form a first mode; the method comprises the steps of,

the second light source module is used for projecting illumination light to form a second mode.

Optionally, the system further comprises a fixation module, wherein the fixation module and the at least one image collector are synchronously adjusted.

Optionally, the fixation module includes locating one side of main optical axis and with the speculum that the beam splitting component corresponds the setting, and along with the parallel direction of main optical axis in proper order keep away from the second imaging lens group and the fixation module that the speculum set up.

Optionally, the pattern projection device comprises a fixation light source and a light transmission pattern plate arranged between the fixation light source and the second imaging lens group.

Optionally, the projection light source includes a projection light source piece, a first condenser lens group and a light homogenizer.

Optionally, the light source projection module includes a first annular lighting module set up corresponding to the hollow reflector, and an adjusting diaphragm set up between the first annular lighting module and the hollow reflector, wherein, the working mode of adjusting diaphragm is switchable, in order to form the first mode and the second mode.

Optionally, the light source projection module further includes a first spectroscope, which is disposed corresponding to the hollow reflector;

the first light source module is arranged corresponding to one side of the first spectroscope facing the hollow reflecting mirror;

the second light source module is arranged corresponding to one side of the first spectroscope, which is opposite to the hollow reflecting mirror.

Optionally, the first light source module includes a first light source and a diaphragm module disposed between the first light source and the first spectroscope; and/or the number of the groups of groups,

the second light source comprises a second annular light source and a second spectroscope arranged between the second annular light source and the first spectroscope.

Optionally, the focus scanning unit comprises a position adjuster to adjust the position of the image collector.

Optionally, the image collector includes:

the first image collector is arranged corresponding to the first imaging lens group and is used for collecting images on the first imaging lens group and synchronously adjusting the connection of the first image collector and the fixation module; the method comprises the steps of,

the second image collector is arranged corresponding to the first imaging lens group and is used for collecting images on the first imaging lens group;

the position adjusters are provided in plural, and the plurality of position adjusters include:

a first position adjuster that synchronously adjusts positions of the imaging system and the fixation module; the method comprises the steps of,

and a second position adjuster adjusting the second image collector.

Optionally, the first imaging lens group comprises a zoom lens group, and the focal length of the imaging system is adjusted by adjusting the zoom lens group through the focal length scanning unit.

The utility model also provides an eye refraction distribution measuring device which comprises the image acquisition device; and an operation unit for obtaining the refractive distribution of the eye according to the image sequence.

The image acquisition device and the eye refractive distribution measuring equipment provided by the utility model are used for adjusting the imaging system to an initial adjusting state according to the refraction condition of the fundus fovea of each tested person during testing, and then taking the initial adjusting state as a starting point to perform state adjusting scanning of the imaging system so as to realize measurement of the eye refractive distribution. Therefore, the scanning range of the imaging system can be automatically adjusted according to individual conditions of different testees, the time for measuring the refractive power distribution of the eyes is greatly shortened, the difficulty of matching the testees in the measuring process of the refractive power distribution of the eyes is reduced, and the efficiency and the accuracy of measuring the refractive power distribution of the eyes are improved.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of refractive ranges of human eyes of different individuals;

FIG. 2 is a schematic view of a prior art refractive adjustment range:

FIG. 3 is a schematic diagram of a first embodiment of an image capturing device according to the present utility model;

FIG. 4 is a schematic view of the refractive adjustment range of the image capture device of FIG. 3 during testing;

FIG. 5 illustrates two operating states of an embodiment of the adjustment stop of FIG. 3;

FIG. 6 shows two operating states of another embodiment of the adjusting diaphragm of FIG. 3

FIG. 7 is a light path diagram of the adjustment stop of FIG. 4 in a first mode;

FIG. 8 is a light path diagram of the adjusting diaphragm of FIG. 4 in a second mode;

FIG. 9 is a schematic diagram of a second embodiment of an image capturing device according to the present utility model;

FIG. 10 is a schematic diagram of a third embodiment of an image capturing device according to the present utility model;

FIG. 11 is a schematic diagram illustrating the operation of the first light source module of FIG. 10;

FIG. 12 is a schematic view of an alternative first configuration of the second diaphragm of FIG. 11;

fig. 13 is a schematic view of a second alternative structure of the second diaphragm in fig. 11.

Reference numerals illustrate:

the achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are included in the embodiments of the present utility model, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.

In addition, if there is a description of "first", "second", etc. in the embodiments of the present utility model, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.

The present utility model provides an image acquisition device, please refer to fig. 3 to 8, comprising:

an ocular lens group 11, a light splitting element 12, a hollow reflecting mirror 13, a fixation module 33, a light source projection module 5, a focus sweeping unit, an imaging system and a control device 6,

the light source projection module 5 includes a first mode for projecting measurement light and a second mode for projecting illumination light. The measuring light is specifically annular light, and the annular light can be annular formed by a plurality of points, also can be annular, and can be in an infrared light wave band. The illumination light is specifically a surface light, and unlike annular illumination, it is possible to form integral illumination in a certain area, such as a circular illumination area, a rectangular illumination area, or the like.

The imaging system comprises a first imaging lens group 14 and at least one image collector 2;

the coke sweeping unit comprises a first position regulator 41 and a second position regulator 42, wherein the first position regulator 41 is connected with the first imaging lens group 14 and/or the at least one image collector 2 and is used for changing the position of the first imaging lens group 14 and/or the at least one image collector 2; a second position adjuster 42 is connected to the fixation module 33 for changing the position of the fixation module 33;

a control device 6 for obtaining a refractive value at the macula of the eye and controlling the imaging system in an initial adjustment state according to the refractive value; taking the initial adjustment state as a starting point, controlling an imaging system to continuously perform state adjustment scanning, so that the image collector acquires image sequences of different defocus degrees of the fundus; and obtaining the refractive distribution of the eye according to the image sequence.

For the control of the imaging system state, the control device 6 is electrically connected with the focus scanning unit, and the position of the first imaging lens group 14 and/or the position of the at least one image collector 2 are adjusted by controlling the focus scanning unit so as to control and scan the focal length of the imaging system.

The control device is further electrically connected with the light source projection module 5, and is used for controlling the light projection mode of the light source projection module 5.

The method for obtaining the refraction value at the macula of the eye can be realized by receiving external data or directly measuring, and the source of the external data can be a consultation, a local or online database lookup, a remote server lookup, etc.

After the control device 6 has acquired the sequence of images from the image collector, the eye refractive distribution is obtained by image processing and calculation.

The fixation module 33 is used for guiding the vision and relaxing eyes to be tested, and is in a state of no diopter adjustment.

The spectroscopic element 12 is a dichroic mirror, a dichroic glass plate, or the like.

In the embodiment of the utility model, the fixation module 33 includes a fixation light source 331 and a transparent pattern plate 332 disposed between the fixation light source 331 and the second imaging lens group 32, the fixation light source 331 projects light to the transparent pattern plate 332, forms a corresponding pattern after passing through the transparent pattern plate 332, and then sequentially passes through the second imaging lens group 32, the reflecting mirror 31 to the light splitting element 12, and then is reflected to the ocular lens group 11 by the light splitting element 12, and further projects to the fundus of the subject, the fixation light source 331 may be an LED light source structure, and the transparent pattern plate 332 may be a semitransparent pattern plate. Specifically, the fixation light source includes a fixation light source part 331a, a first condensing lens group 331b and a light homogenizer 331c, wherein the fixation light source part 331a is an LED or the like, and the light can uniformly reach each area of the light transmission pattern plate 332 through the actions of the first condensing lens group 331b and the light homogenizer 331 c.

Alternatively, the fixation module may also take a non-patterned form, such as a bright spot, etc., so long as it functions as a line of sight guide.

In an embodiment of the present utility model, the light source projection module 5 includes a first annular lighting module 5a disposed corresponding to the hollow reflector 13, and an adjusting diaphragm 5b disposed between the first annular lighting module 5a and the hollow reflector 13. Wherein, the adjusting diaphragm 5b has two modes, namely a small hole mode, as shown in fig. 7, in which, in the mode, the light passing through the small hole is transmitted through the light path as shown by the solid line in the figure, and forms a bright ring on the fundus to form the first mode, and the mode is used for determining the initial adjusting state of the imaging system; the second mode is a non-working mode, namely a light-passing mode, as shown in fig. 8, in which the diaphragm 3 does not block the illumination light of the fundus, the shadow part is the light emitted by the annular light source, and the light can illuminate the whole fundus and provide surface light for photographing fundus images so as to form the second mode. The adjusting diaphragm 5b may be in the form of a position switch in fig. 5, or in the form of a mechanically variable aperture diaphragm of the rotary vane type in fig. 6, the shape of the small holes can be controlled through the LCD liquid crystal screen, so that the change of two light emitting modes can be realized. The present utility model is not limited as to how the adjustment diaphragm 5b is adjusted in particular.

The utility model also provides an eye refraction distribution measuring device which comprises the image acquisition device; and an operation unit for obtaining the refractive distribution of the eye according to the image sequence.

The measuring method of the eye refractive distribution measuring device is as follows:

first, the fixation pattern or fixation mark formed by the fixation light source 331 is converged into the human eye through the second imaging lens group 32, the reflecting mirror 31, the light splitting element 12, and the eyepiece group 11 in order, imaging on the retina of the human eye, guiding the gaze direction of the human eye. The light reflected by the fundus oculi is converged by the ocular lens group 11, split into light elements 12, passes through the middle light-transmitting small hole of the hollow reflecting mirror 13 and the first imaging lens group 14, and is imaged at the image collector 2, and the conjugate surface of the fixation pattern in the human eye is positioned in front of the conjugate surface of the image collector 2 in the human eye (the direction close to the anterior ocular segment is anterior).

The control device 6 controls the position controller 41 and the position controller 42 separately, so that the relative positions of the fixation module and the image collector 1 are kept unchanged, and the position difference of the conjugate planes of the fixation module and the image collector in the human eye is always consistent. Thus, when the image collector 1 is conjugated with the macula of a human eye, the semitransparent pattern is imaged at a fixed distance in front of the retina of the human eye, and a pattern with a fixed degree of blurring is presented, so that the foggy vision effect can avoid refractive adjustment of the human eye.

Next, the control device 6 sets the diaphragm 5b to an operation mode, that is, a pinhole mode, and the annular illumination light formed by the annular light source 5a is converged into the eye through the hollow mirror 13, the spectroscopic element 12, and the eyepiece group 11 in this order, forming a bright ring at the fundus. As shown in fig. 11, the size of the bright spots cast into the fundus varies due to the different axial lengths of the different refractive eyes. In fig. 11, the myopic eye, the emmetropic eye, and the hyperopic eye correspond to the bright spot sizes A1B1, A2B2, and A3B3, respectively. The eyeground brilliant ring is reflected by retina to exit human eye, and then is converged by ocular lens group 11, light splitting element 12, light-transmitting small hole in middle part passing through hollow reflector 13, first imaging lens group 14, and imaged at image collector 2.

The control device 6 calculates a rough refractive measurement value D1 at the macula of the eye according to the size of the bright spot of the fundus of the eye, which is acquired by the image acquisition device 2 at the current position, and controls the image acquisition device 2 to a D1 position, wherein the D1 position refers to an image plane position conjugated with the fundus when the macula is refractive at D1, and controls the fixation module 33 to a D1 'position, wherein the D1' position refers to a position forming a myopia defocus at the fundus when the macula is refractive at D1. Then, the control device 6 calculates and obtains a refractive value D2 of the macula lutea of the human eye according to the size of the fundus bright spot collected by the image collector 2 at the D1 position, if the difference between D2 and D1 is large, the fixation module 33 moves to the D2' position, the image collector 2 moves to the D2 position for image collection, the above steps are repeated until the deviation between D2 and D1 measured twice before and after is less than or equal to a certain threshold xD, and finally an accurate refractive value of the macula lutea is obtained, so that the imaging system is in an initial adjustment state. The initial adjustment state is a state that the imaging system displays a clear image on the macula, and is realized by adjusting the focal length of the first imaging lens group 14 and/or the position of the at least one image collector 2.

Next, the control device 6 controls the diaphragm 5b to change from the aperture mode to the light-passing mode, and the entire fundus is illuminated by the surface light formed by the light source projection module 5. Then, the first imaging lens group 14 or the image collector 2 of the imaging system takes the initial adjustment state as a starting point and performs state adjustment scanning with scanning parameters under the control of the control device 6, and simultaneously continuously collects image sequences at different positions of the retina under different adjustment states, so that the state adjustment scanning range can be reduced, and the time for measuring the refractive distribution of the eye can be shortened.

Specifically, the control device 6 determines the refractive adjustment range and strategy of the eye refractive distribution measurement from the obtained macular refractive value, and initializes the initial adjustment state of the focus scanning unit. And obtaining scanning parameters according to data statistics of a large number of testees, wherein the scanning parameters comprise scanning ranges, step sizes and the like. Assuming a measured macular refraction value of Q, a refractive adjustment range of Q- Δq1 to q+Δq2, the initial adjustment state is set to correspond to the Q value, or to Q- Δq1, q+Δq2, or any value between Q- Δq1 and q+Δq2. Δq1 and Δq2 can be obtained by data statistics. For refractive adjustment strategies, the refractive adjustment interval is selected to be delta D, the adjustment direction can be from Q-delta Q1 to Q+delta Q2, or from Q+delta Q2 to Q-delta Q1, or from Q-delta Q1 to Q+delta Q2, the adjustment can be sequentially scanned from a certain value, to the direction of increasing or decreasing Q, and the refractive adjustment in the range of Q-delta Q1 to Q+delta Q2 is completed. The refractive adjustment may be by continuously changing the focal length of the first imaging lens set and/or by continuously changing the position of the movement of the image collector.

Finally, the image sensor 2 transmits all fundus image sequences to the operation unit, the operation unit calculates the refraction distribution of the whole retina of the human eye according to the state of the imaging system and the obtained image sequences, and the calculation result is output to the display for display. Specifically, for a plurality of target positions of the fundus, obtaining optimal image definition of each target position according to the image sequence, then obtaining focal length and refractive value of the corresponding target position according to the optimal image definition, and finally synthesizing eye refractive distribution according to the refractive values of the plurality of obtained target positions. The target positions are different positions of the fundus according to measurement requirements.

The refractive profile of the whole retina consists of different refractive values at a plurality of different positions of the retina, the refractive values varying with the variation of the different positions, expressed as E (r, θ) in polar coordinates, with a certain position of the retina (e.g. the center of the macula) as the origin, r as the polar diameter, i.e. the diametric direction, representing different angles of view, 0< r1, r1 being the measured maximum angle of view, e.g. 20 DEG-70 DEG, θ being the polar angle, 0.ltoreq.θ.ltoreq.2pi, representing the azimuth, or the circumferential direction. The refraction distribution of naked eyes is irregularly distributed in the radial direction and the circumferential direction.

As shown in fig. 9, which is another embodiment of the present utility model, unlike the above embodiments, the image collectors 2 are provided in two, including:

a first image collector 2a for measuring, for a first mode of the light source projection module 5, that is, receiving reflected light of the fundus when the annular light illuminates the fundus; the method comprises the steps of,

a second image collector 2b for measuring, for the second mode of the light source projection module 5, the reflected light of the fundus when the fundus is illuminated by the received surface light.

In addition, another embodiment of the present utility model, unlike the above embodiment, the position adjusters 4 are provided in plural, including:

a first position adjuster 41 on which the first image pickup 2a and the fixation module 33 are simultaneously provided; and a second position adjuster 42 that adjusts the position of the second image pickup 2b. By simultaneously arranging the first image collector 2a and the fixation module 33 at the first position regulator 41, the positions of the first image collector 2a and the fixation module 33 are kept constant, and synchronous regulation is performed, so that the position difference of the conjugate planes of the first image collector 2a and the fixation module 33 in the human eye always keeps consistent. Thus, when the first image collector 2a is conjugated with the macula of the human eye, the image on the fixation module 33 will be imaged at a fixed distance in front of the retina of the human eye, and a pattern with a fixed degree of blurring is presented, so that the refractive adjustment of the human eye can be avoided due to the fog effect.

It will be appreciated that the number of position adjusters may be three for adjusting the fixation module, the first image collector 2a, and the second image collector 2b, respectively.

As for the measurement method of the apparatus, the difference from the above-described embodiment is that the first image pickup 2a is employed to measure for the macula to determine the initial adjustment state of the imaging system. The second image collector 2b is adopted to measure the refraction distribution of the retina of the eye, specifically, an imaging system formed by the second image collector 2b and the first imaging lens group is adjusted to an initial adjustment state according to the measurement result of the macula lutea, and then the distribution measurement is carried out by taking the initial adjustment state as a starting point and taking the scanning parameters, so that the state adjustment scanning range can be reduced, and the time for measuring the refraction distribution of the eye can be shortened.

As shown in fig. 10 to 13, another embodiment of the present utility model is different from the above embodiment in that the light source projection module 5 specifically includes:

a first light source module 51, disposed corresponding to the hollow reflector 13, for projecting annular light to the hollow reflector 13 to form the first mode; the method comprises the steps of,

the second light source module 52 is disposed corresponding to the hollow reflector 13, and is configured to project surface light to the hollow reflector 13 to form the second mode.

That is, in this embodiment, the first light source module 51 and the second light source module 52 generate illumination light with different shapes, respectively, so as to realize adjustment of the light emitting modes of the two.

Specifically, in this embodiment, the light source projection module 5 further includes a first beam splitter 53 disposed corresponding to the hollow reflecting mirror 13, the first light source module 51 is disposed corresponding to one side of the first beam splitter 53 facing the hollow reflecting mirror 13, and the second light source module 52 is disposed corresponding to one side of the first beam splitter 53 opposite to the hollow reflecting mirror 13, so that, by the arrangement of the first beam splitter 53, the first light source module 51 and the second light source module 52 can project light to the hollow reflecting mirror 13 at different positions.

More specifically, in this embodiment, the first light source module 51 includes a first light source 511 and a diaphragm module 512 disposed between the first light source 511 and the first beam splitter 53, where the first light source 511 includes an LED lamp, the diaphragm module 512 includes a first diaphragm 512a and a second diaphragm 512b, a small hole is disposed on the first diaphragm 512a, an annular diaphragm hole is disposed on the second diaphragm 512b, and light emitted from the first light source 511 passes through the first diaphragm 512a to form a point light source, and further passes through the annular diaphragm hole on the second diaphragm 512b to form a bright ring.

More specifically, in this embodiment, the second light source module 52 includes a second annular light source 521, and a second beam splitter 522 disposed between the second annular light source 521 and the first beam splitter 53, and it is obvious that the second light source need not be an annular light source, but may be an area array light source, such as an area array LED.

In an embodiment of the present utility model, the first imaging lens group 14 includes a zoom lens group, and the focus scanning unit adjusts the focal length of the imaging system by changing the focal length of the zoom lens group, or simultaneously changes the position of the image pickup 2 and the focal length of the zoom lens group.

The foregoing description is only of the preferred embodiments of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structural changes made by the description of the present utility model and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the utility model.

Claims (10)

1. An image acquisition apparatus, comprising:

the imaging system comprises a first imaging lens group and at least one image collector;

a light source projection module; the method comprises the steps of,

the control device acquires a refraction value of the macula of the eye and controls the imaging system to be in an initial adjusting state according to the refraction value; and taking the initial adjustment state as a starting point, controlling an imaging system to continuously perform state adjustment scanning, so that the image collector acquires image sequences of different defocus degrees of the fundus.

2. The apparatus of claim 1, wherein the light source projection module comprises a first mode to project measurement light and a second mode to project illumination light.

3. The apparatus of claim 2, wherein the refractive value at the macula of the eye is determined in the first mode.

4. The apparatus of claim 1, wherein the first imaging lens group comprises a zoom lens group.

5. The apparatus of claim 4, wherein the state adjustment scan is to adjust a position of the at least one image collector and/or to adjust a focal length of the zoom lens group.

6. The apparatus of claim 1, wherein the light source projection module comprises a first annular lighting module and an adjustment stop;

or, the light source projection module includes:

the first light source module is used for projecting measurement light to form a first mode; and the second light source module is used for projecting illumination light to form a second mode.

7. The apparatus of claim 1, wherein the at least one image collector comprises:

a first image collector, and a second image collector.

8. The apparatus of claim 1, further comprising a fixation module.

9. The apparatus of claim 8, wherein the fixation module is adjusted in synchronization with the at least one image collector.

10. An ophthalmic refractive distribution measuring device comprising the image acquisition apparatus according to any one of claims 1 to 9; and an operation unit for obtaining the refractive distribution of the eye according to the image sequence.

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