Refractive Topography System

Abstract

The present invention discloses a refractive topography measurement system, comprising: a light projection component, comprising a light source and an adjustable space frequency modulator, the adjustable space frequency modulator having a plurality of mutually spaced light holes, the light source being used to project light to the adjustable space frequency modulator, the output light of the adjustable space frequency modulator being used to project illumination light to a fundus to be measured; an image acquisition component, the image acquisition component being used to collect reflected light of the output light of the refractive topography measurement system and form an image; the image comprising image information of the adjustable space frequency modulator. The technical solution of the present invention can improve the accuracy of refractive topography measurement.

Description

Technical Field

[0001] The invention relates to the technical field of refractive topography measurement, and in particular to a refractive topography measurement system. Background Art

[0002] The measurement and drawing of refractive topography can image the positions at different depths of the fundus. Due to the different imaging depths, the positions with the highest clarity in the image are different for each imaging. The sequence of changes in clarity at different positions on each image with the image number is further calculated, and the refractive information of each part of the fundus is obtained through the mapping relationship between the clarity change sequence and the refractive power, and the refractive topography is constructed through the refractive information. However, when obtaining clarity information, it is necessary to calculate the clarity at different positions of the image. The way to judge clarity is to analyze the intensity of the high-frequency signal in the image. However, under the same clarity, the higher the contrast of the imaged object, the easier it is to judge clarity, and the lower the contrast, the more difficult it is to judge clarity. That is, if the imaged object is a pure white flat plate with uniform illumination, the high-frequency signal is almost 0 regardless of whether the image is clear or not, and the clarity cannot be judged. However, the distribution of fundus tissue and blood vessels in the human eye is not uniform. For example, there is almost no blood vessel distribution in the peripheral field fundus, and the image contrast is low, making it difficult to calculate the clarity of each position of the image. In order to make the refractive topography measurement more accurate so that ophthalmologists can better judge the health of the eyes, a refractive topography measurement system that can improve the accuracy of the refractive topography measurement is needed. Summary of the invention

[0003] The main purpose of the present invention is to provide a refractive topography measurement system, aiming to improve the accuracy of refractive topography measurement.

[0004] To achieve the above object, the refractive topography measurement system proposed in the present invention comprises:

[0005] A light projection assembly, comprising a light source and an adjustable space-frequency modulator, wherein the adjustable space-frequency modulator has a plurality of mutually spaced light holes, the light source is used to project light to the adjustable space-frequency modulator, and the output light of the adjustable space-frequency modulator is used to project illumination light to the fundus to be tested;

[0006] An image acquisition component is used to acquire reflected light of the outgoing light of the refractive topography measurement system and form an image; the image includes image information of the adjustable space-frequency modulator.

[0007] Optionally, the plurality of light holes are arranged in an array, and the arrangement period of the light holes is greater than or equal to 0.2Mmm and less than or equal to 0.3Mmm; wherein M is the imaging magnification when the fundus to be measured is imaged to the adjustable space-frequency modulator when the refractive topography measurement system and the fundus to be measured are in the measuring position.

[0008] Optionally, the light through hole includes a first light through hole and a second light through hole, and the first light through hole and the second light through hole are each provided in plurality, and the plurality of second light through holes are distributed around the plurality of first light through holes; the light through hole diameter of the first light through hole is smaller than the light through hole diameter of the second light through hole.

[0009] Optionally, the field angle of the light emitted from the plurality of first light holes is configured to be greater than or equal to 35° and less than or equal to 45°.

[0010] Optionally, the duty cycle of the first light-transmitting hole is configured to be greater than or equal to 15% and less than or equal to 25%; and / or

[0011] The duty cycle of the second light-transmitting hole is configured to be greater than or equal to 35% and less than or equal to 45%.

[0012] Optionally, the plurality of light-through holes are arranged in a hexagonal array.

[0013] Optionally, the position of the adjustable space-frequency modulator is adjustable.

[0014] Optionally, the light projection assembly further comprises a first light projection mirror group, wherein the first light projection mirror group is arranged on the optical path between the light source and the adjustable space-frequency modulator; and / or

[0015] The light projection assembly further comprises a second light projection mirror group, and the second light projection mirror group is arranged at the light output side of the adjustable space frequency modulator; and / or

[0016] The light source is configured as a ring-shaped light source.

[0017] Optionally, the image acquisition component includes a zoom imaging lens group and an image collector; the zoom imaging lens group is arranged on the light incident side of the image collector.

[0018] Furthermore, the refractive topography measurement system also includes a beam splitter and an eyepiece objective lens group, the beam splitter is arranged on the light input side of the image acquisition component and the light output side of the light projection component; the beam splitter is used to couple the optical paths of the light projection component and the image acquisition component; the eyepiece objective lens group is arranged on the optical path of the image acquisition component and the light projection component coupled by the beam splitter.

[0019] In the technical solution of the present invention, the light projection component includes an adjustable space-frequency modulator, and the light from the light source is projected onto the adjustable space-frequency modulator, so that the adjustable space-frequency modulator blocks part of the light, and the other part is emitted through the light hole; the emitted part finally emits the refractive topography measurement system and illuminates the fundus to be measured; this is equivalent to projecting the shadow of the opaque part of the adjustable space-frequency modulator onto the fundus. This part of the light is captured by the image acquisition component after being reflected, and the final image will show the pattern of the fundus and the pattern of the shadow of the adjustable space-frequency modulator. Since there is no light in the shadow of the adjustable space-frequency modulator, the brightness is very low; and the brightness of the illuminated part of the fundus is very high, this greatly improves the contrast of the final image, thereby making the clarity judgment more accurate, so that the accuracy of the refractive topography measurement can be further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0021] Figure 1 It is a structural schematic diagram of an embodiment of a refractive topography measurement system of the present invention;

[0022] Figure 2 It is a structural schematic diagram of a first embodiment of an adjustable space-frequency modulator;

[0023] Figure 3 It is a structural schematic diagram of a second embodiment of an adjustable space-frequency modulator;

[0024] Figure 4 This is the fundus image when the adjustable space frequency modulator is not used;

[0025] Figure 5 It is a curve diagram showing the variation of the signal intensity of the fundus image with the spatial frequency when the adjustable space frequency modulator is not used;

[0026] Figure 6 This is the fundus image when using an adjustable space-frequency modulator;

[0027] Figure 7 It is a curve diagram showing the variation of the signal intensity of the fundus image with the spatial frequency when the adjustable space frequency modulator is used;

[0028] Figure 8 is the first fundus image;

[0029] Fig. 9 is the second fundus image;

[0030] Fig.10 is the third fundus image;

[0031] Fig.11 is a curve diagram showing the variation of the signal intensity of the third fundus image with the spatial frequency;

[0032] Fig.12 is the fourth fundus image;

[0033] Fig.13 Graph showing signal intensity variation versus spatial frequency of the fourth fundus image.

[0034] Description of Figure Numbers:

[0035]

[0036] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0039] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0040] The invention provides a refractive topography measurement system.

[0041] In the embodiment of the present invention, reference Figures 1 to 3 , the refractive topography measurement system comprises:

[0042] The light projection assembly includes a light source 10 and an adjustable space frequency modulator 20. The adjustable space frequency modulator 20 has a plurality of mutually spaced light holes 21. The light source 10 is used to project light to the adjustable space frequency modulator 20. The output light of the adjustable space frequency modulator 20 is used to project illumination light to the fundus to be tested.

[0043] The image acquisition component is used to collect the reflected light of the outgoing light of the refractive topography measurement system and form an image; the image includes the image information of the adjustable space-frequency modulator 20.

[0044] The light projection component is used to transmit illumination light to the fundus so that the fundus image can be captured. The image acquisition component is used to acquire the fundus image. The adjustable space-frequency modulator 20 can use various types of spatial light modulators, such as a transmissive LCD (liquid crystal display), which controls the light transmission or light shielding of different pixel units on it to form a Figure 2 or Figure 3 As shown in the figure, the partially light-shielding and partially light-transmitting group (i.e., the light-through hole 21 structure) may be used; or a reflective DMD (digital micro-mirror device) may be used, so that some of the different pixel units on the DMD may reflect light and some may not reflect light, for example, Figure 2 or Figure 3 In the image shown, the pixel units corresponding to the black area are not reflective, while the pixel units corresponding to the white area are reflective. The light-through hole 21 is also formed by the reflective pixel units, and the non-reflective pixel units form the body of the adjustable space-frequency modulator 20. The adjustable space-frequency modulator 20 can also use an opaque plate, and punch holes in the opaque plate to form the light-through hole 21; the adjustable space-frequency modulator 20 can also use a patterned plate, that is, a plate having a patterned pattern as shown in FIG. Figure 2 and Figure 3 The pattern plate of the pattern shown, wherein the white position is the light-transmitting position, i.e., the light-transmitting hole 21 is formed, and the black position is the light-blocking position, forming the body of the adjustable space-frequency modulator 20. In general, the function of the adjustable space-frequency modulator 20 is to project the shadow of the adjustable space-frequency modulator body onto the fundus, so that there is a shadow image on the fundus photograph captured by the refractive topography measurement system. Therefore, the light-transmitting hole 21 is to be understood in a broad sense, and cannot be understood as a physical hole, or a hole through which light can pass, but should be understood as a structure that enables light to be emitted again after being incident; for example, the pixel unit that can reflect light in the above-mentioned DMD, the pixel unit that can transmit light in the LCD, the physical hole on the board, and the transparent hole on the pattern plate can all be the light-transmitting hole 21.

[0045] like Figure 4 As shown, it is an image of the fundus when the adjustable space-frequency modulator 20 is not used, that is, an image of the fundus imaging in the prior art; Figure 5for Figure 4 The distribution curve of signal intensity in the image with spatial frequency. It can be seen that even when the image is clear, the signal intensity of the high-frequency signal in the image is low, which makes it difficult to accurately calculate the image clarity. Figure 6 This is the fundus image when the adjustable space-frequency modulator 20 is used. It can be seen that the shadow of the adjustable space-frequency modulator 20 is projected onto the fundus, which makes the fundus image have additional high-frequency signal peaks at the spatial frequency of 4lp / mm compared with the fundus image when the adjustable space-frequency modulator 20 is not used. This is conducive to accurate analysis of clarity and thus improves the accuracy of refractive topography measurement.

[0046] refer to Figure 2 and Figure 3 Optionally, a plurality of light holes 21 are arranged in an array, and an arrangement period of the light holes 21 is greater than or equal to 0.2Mmm and less than or equal to 0.3Mmm; wherein M is an imaging magnification when the fundus to be measured is imaged to the adjustable space-frequency modulator 20 when the refractive topography measurement system and the fundus to be measured are in a measuring position.

[0047] The light holes 21 can be in an array such as a circular array or a square array, which is conducive to uniform distribution of light from the light holes 21 to the fundus, avoiding interference with clarity measurement due to different light brightness. The arrangement period of the light holes 21 has different meanings in different arrays. For example, in a square array, it can be the center distance between two adjacent light holes 21 in the same row or column; in a circular array, it can be the distance between the centers of two adjacent light holes 21 in the radial or circumferential direction. Regarding the period, different array distributions can be adaptively understood. The center of the light hole 21 refers to its geometric center, such as the center of a circular light hole 21, the intersection of the diagonals of a square light hole 21, or the intersection of the diagonals of a hexagonal light hole 21.

[0048] The period of the light-through hole 21 can actually affect the spatial period of the signal intensity enhanced for the imaged image: that is, Fig.10 and Fig.12 As shown, Fig.10 The arrangement period of the light-passing holes 21 of the adjustable space-frequency modulator 20 used in Fig.12 The arrangement period of the light-through holes 21 of the adjustable space-frequency modulator 20 used in the embodiment is large. Fig.11 and Fig.13 As shown, Fig.11 for Fig.10 The distribution curve of signal intensity versus spatial frequency in the image shows that the signal intensity is enhanced when the spatial frequency is equal to 2lp / mm; Fig.13 for Fig.12The distribution curve of the signal intensity in the image with the spatial frequency shows that the signal intensity is enhanced at a spatial frequency of 8lp / mm; it can be seen that the larger the arrangement period of the light holes 21, the smaller the spatial frequency corresponding to the position where the signal enhancement occurs. Therefore, when the arrangement period of the light holes 21 is too large, the enhanced signal intensity may be submerged in the low-frequency signal of the fundus image, which is already strong. Fig.11 When the arrangement period of the light-passing hole 21 is too small, the smaller the period is, the closer it is to the situation where the adjustable space-frequency modulator 20 is not used, or the shadow of the adjustable space-frequency modulator 20 is evenly distributed in the area, the enhanced signal strength will be weak, that is, Fig.13 When the arrangement period of the light-through holes 21 is within the above range, the above defects can be overcome.

[0049] In addition, the actual effect of the arrangement period of the light holes 21 on the spatial frequency at the enhanced signal intensity does not depend on the absolute arrangement period of the light holes 21, because in the process of light projection, the propagation direction of the light may be modulated, so that when the shadow of the main body of the adjustable space-frequency modulator 20 is projected onto the fundus, the size of the shadow is inconsistent with that of the main body. Therefore, the coefficient M, that is, the imaging magnification from the fundus to be measured to the adjustable space-frequency modulator 20, is set to eliminate the influence of the imaging magnification.

[0050] refer to Figure 3Optionally, the light hole 21 includes a first light hole 21a and a second light hole 21b, and a plurality of the first light hole 21a and the second light hole 21b are provided, and the plurality of second light holes 21b are distributed around the plurality of first light holes 21a; the diameter of the light hole 21 of the first light hole 21a is smaller than the diameter of the light hole 21 of the second light hole 21b. This makes the light flux of the first light hole 21a smaller, while the light flux of the second light hole 21b is larger. Since the reflectivity of different positions of the fundus of the human eye is different, if the fundus is illuminated with uniform light, the intensity distribution of the reflected light is uneven, which will cause uneven distribution of the brightness of the image. Usually, the reflectivity of the middle part of the fundus is higher, so making the light flux of the first light hole 21a smaller can make the final image brightness more uniform. Uniform brightness is conducive to collecting more comprehensive images of the fundus, avoiding overexposure of locations with high reflectivity and overdarkness of locations with low reflectivity during a single shooting process; overexposure or overdarkness will result in loss of image information, thus affecting the calculation of clarity. Therefore, providing the first light hole 21a and the second light hole 21b can make the acquisition of fundus refractive information more comprehensive. In addition, the fact that the diameter of the light hole 21 of the first light hole 21a is smaller than the diameter of the light hole 21 of the second light hole 21b does not mean that the apertures of different first light holes 21a are the same, nor does it mean that the apertures of different second light holes 21b are the same. For example, the apertures of all light holes 21 can present such a trend, that is, from the radial inward direction, the diameter component of the light hole 21 of the light hole 21 decreases, as long as the diameter of the light hole 21 of the first light hole 21a is smaller than the diameter of the light hole 21 of the second light hole 21b. Reference Figure 8 and Fig. 9 , Figure 8 This is a fundus photograph taken under normal conditions. It can be seen that the middle part is brighter, reflecting high reflectivity, while the edge is darker, reflecting low reflectivity. Fig. 9 This is a fundus photograph taken after adopting the above embodiment. It can be seen that the uniformity of fundus brightness is significantly improved.

[0051] refer to Figure 3 Optionally, the field of view angle of the emitted light of the multiple first light holes 21a is configured to be greater than or equal to 35° and less than or equal to 45°. Usually within a certain field of view angle, the reflectivity of the fundus is relatively high. If the field of view angle of the emitted light of the multiple first light holes 21a is too large, it may exceed the field of view angle of the high reflectivity area of ​​the fundus and reach the low reflectivity area of ​​the fundus, resulting in insufficient illumination of the low reflectivity area; and when the field of view angle of the emitted light of the multiple first light holes 21a is too small, the emitted light of the multiple first light holes 21a may not cover a sufficient area of ​​the high reflectivity area of ​​the fundus, resulting in uneven final imaging brightness. When the field of view angle of the emitted light of the multiple first light holes 21a is within the above range, the above defects can be overcome; for example, the field of view angle of the emitted light of the multiple first light holes 21a is set to 40°.

[0052] refer to Figure 2 and Figure 3 Optionally, the duty cycle of the first light-transmitting hole 21a is configured to be greater than or equal to 15% and less than or equal to 25%; and / or

[0053] The duty ratio of the second light-transmitting hole 21 b is configured to be greater than or equal to 35% and less than or equal to 45%.

[0054] If the duty cycle is too high, the shadow area of ​​the adjustable space-frequency modulator 20 will be too small, resulting in a smaller enhanced signal strength; and if the duty cycle is too high, the amount of light transmitted will be too small, and clear imaging cannot be achieved. When the duty cycle is between 15% and 45%, the above defects can be overcome. In particular, when the duty cycle of the first light hole 21a is configured to be greater than or equal to 15% and less than or equal to 25%, and the duty cycle of the second light hole 21b is configured to be greater than or equal to 35% and less than or equal to 45%, it can ensure that the aperture of the first light hole 21a is smaller than the aperture of the second light hole 21b, while also overcoming the above defects; for example, the duty cycle of the first light hole 21a can be configured to 20%, and the duty cycle of the second light hole 21b can be configured to 40%.

[0055] refer to Figure 2 and Figure 3 Optionally, the plurality of light holes 21 are arranged in a hexagonal array. The hexagonal array can ensure that the nearest light holes 21 around a light hole 21 (if the light hole 21 is not at the edge of the array, there should be six other light holes 21 adjacent to it) are at the same center distance, so that the array can be approximately isotropic and the fundus can be made to present a shape that conforms to the fundus itself as much as possible. In addition, in particular, in the hexagonal array, the array period refers to the center distance between two adjacent light holes 21.

[0056] refer to Figure 1 Optionally, the position of the adjustable space-frequency modulator 20 is adjustable. In order to project the shadow of the adjustable space-frequency modulator 20 onto the fundus, the adjustable space-frequency modulator 20 should be in an approximately conjugate position with the fundus, which requires that the relative position of the adjustable space-frequency modulator 20 and the fundus be adjustable. Adjusting the relative position of the adjustable space-frequency modulator 20 and the fundus can be to adjust the position of the human eye during use; or the adjustable space-frequency modulator 20 itself can have a motion mechanism so that it can adjust the position in the direction of the optical axis and / or the radial direction of the optical axis; of course, the clear imaging position of the adjustable space-frequency modulator 20 can also be adjusted by setting a lens group and adjusting the focal length of the lens group, so that the imaging position of the adjustable space-frequency modulator 20 approximately coincides with the fundus to be measured. The above embodiments are all embodiments in which the position of the adjustable space-frequency modulator 20 is adjustable. The adjustable position of the adjustable space-frequency modulator 20 can improve the adaptability of the refractive topography measurement system.

[0057] refer to Figure 1 Optionally, the light projection assembly further includes a first light projection mirror group 30, and the first light projection mirror group 30 is arranged on the optical path between the light source 10 and the adjustable space frequency modulator 20; and / or

[0058] The light projection assembly further includes a second light projection mirror group 40, and the second light projection mirror group 40 is arranged on the light output side of the adjustable space frequency modulator 20; and / or

[0059] The light source 10 is configured as a ring-shaped light source 10 .

[0060] The first projection lens group 30 can modulate the light emitted by the light source 10 so that it converges on the light guide plate. The second light transmission lens group can modulate the output light of the adjustable space frequency modulator 20 so that it is better projected onto the fundus to be measured. The light source 10 is configured as a ring light source 10 to avoid fundus reflection and improve imaging clarity.

[0061] refer to Figure 1 Optionally, the image acquisition component includes a zoom imaging lens group 50 and an image collector 60; the zoom imaging lens group 50 is arranged on the light incident side of the image collector 60. The zoom imaging lens group 50 can focus on different depths of the fundus, so that the image collector 60 can obtain the image required to construct the refractive topography. The image collector 60 can be a photosensitive element such as CMOS or CCD.

[0062] refer to Figure 1 Furthermore, the refractive topography measurement system further includes a beam splitter 70 and an eyepiece lens group 80. The beam splitter 70 is arranged at the light-incoming side of the image acquisition component and the light-outgoing side of the light-projecting component; the beam splitter 70 is used to couple the optical paths of the light-projecting component and the image acquisition component; the eyepiece lens group 80 is arranged on the optical paths of the image acquisition component and the light-projecting component coupled by the beam splitter 70. The beam splitter 70 can be a semi-reflective semi-transparent film or a Figure 1 The hollow reflector shown in the figure can be used to reflect the light from the fundus through the hole of the hollow reflector for imaging; the reflective surface of the hollow reflector can be used to reflect the emitted light of the projection assembly. The hollow reflector can improve the imaging clarity and can also better adapt to the annular light source 10.

[0063] In addition, the first light projection lens group 30, the second light projection lens group 40, the eyepiece lens group 80 and the zoom imaging lens group 50 can all be lens groups composed of a single lens or multiple lenses.

[0064] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A refractive topography measurement system, It is characterized in that include: A light projection assembly, comprising a light source and an adjustable space-frequency modulator, wherein the adjustable space-frequency modulator has a plurality of mutually spaced light holes, the light source is used to project light to the adjustable space-frequency modulator, and the output light of the adjustable space-frequency modulator is used to project illumination light to the fundus to be tested; An image acquisition component, the image acquisition component is used to collect reflected light of the outgoing light of the refractive topography measurement system and form an image; the image includes image information of the adjustable space-frequency modulator; The plurality of light holes are arranged in an array, and the arrangement period of the light holes is greater than or equal to 0.2Mmm and less than or equal to 0.3Mmm; wherein M is the imaging magnification when the fundus to be measured is imaged to the adjustable space-frequency modulator when the refractive topography measurement system and the fundus to be measured are in the measuring position.

2. The refractive topography measuring system according to claim 1, It is characterized in that The light-through holes include a first light-through hole and a second light-through hole. A plurality of the first light-through holes and a plurality of the second light-through holes are provided, and the plurality of the second light-through holes are distributed around the plurality of the first light-through holes. The light-through hole diameter of the first light-through hole is smaller than the light-through hole diameter of the second light-through hole.

3. The refractive topography measuring system according to claim 2, It is characterized in that The field angle of the light emitted from the plurality of first light holes is configured to be greater than or equal to 35° and less than or equal to 45°.

4. The refractive topography measuring system according to claim 2, It is characterized in that The duty cycle of the first light-transmitting hole is configured to be greater than or equal to 15% and less than or equal to 25%; and / or The duty cycle of the second light-transmitting hole is configured to be greater than or equal to 35% and less than or equal to 45%.

5. The refractive topography measurement system according to claim 1, It is characterized in that The plurality of light-through holes are arranged in a hexagonal array.

6. The refractive topography measuring system according to claim 1, It is characterized in that The position of the adjustable space-frequency modulator is adjustable.

7. The refractive topography measuring system according to claim 1, It is characterized in that The light projection assembly further comprises a first light projection mirror group, wherein the first light projection mirror group is arranged on the optical path between the light source and the adjustable space-frequency modulator; and / or The light projection assembly further comprises a second light projection mirror group, and the second light projection mirror group is arranged at the light output side of the adjustable space frequency modulator; and / or The light source is configured as a ring-shaped light source.

8. The refractive topography measuring system according to claim 1, It is characterized in that The image acquisition component comprises a zoom imaging lens group and an image collector; the zoom imaging lens group is arranged on the light incident side of the image collector.

9. The refractive topography measuring system according to claim 1, It is characterized in that The refractive topography measurement system also includes a beam splitter and an eyepiece objective lens group, the beam splitter is arranged on the light input side of the image acquisition component and the light output side of the light projection component; the beam splitter is used to couple the optical paths of the light projection component and the image acquisition component; the eyepiece objective lens group is arranged on the optical path of the image acquisition component and the light projection component coupled by the beam splitter.

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