CN215348892U - A calibration utensil for eye ground camera detects - Google Patents
A calibration utensil for eye ground camera detects Download PDFInfo
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- CN215348892U CN215348892U CN202121649807.XU CN202121649807U CN215348892U CN 215348892 U CN215348892 U CN 215348892U CN 202121649807 U CN202121649807 U CN 202121649807U CN 215348892 U CN215348892 U CN 215348892U
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Abstract
The application discloses a calibration instrument for fundus camera detection, this calibration instrument includes: fixing base, support and model eye, the bottom of support is fixed in the top of fixing base, and the model eye is installed at the top of support, and the model eye includes: the bionic cornea and the bionic lens are sequentially installed in the through hole, wherein the rear lens barrel is a cylinder, a hemispherical cavity is arranged on one side of the rear lens barrel, the rear lens barrel is connected with the front lens barrel, the hemispherical cavity is communicated with the through hole to simulate a human eye structure, and the plurality of resolution ratio plates are arranged on the inner wall of the hemispherical cavity. Through the technical scheme in this application, provide a simple structure, the low-cost calibration apparatus that can be applicable to different specification models eye ground camera to can simulate multiple eye pathological change, improve calibration apparatus's reliability.
Description
Technical Field
The application relates to the technical field of instrument detection, in particular to a calibration instrument for fundus camera detection.
Background
A Fundus Camera (Fundus Camera) is a medical ophthalmic optical instrument for observing and recording retinopathy, and mainly images the Fundus surface to store the Fundus condition in the form of a black-and-white or color image. The device has the advantages of simple structure, convenient operation, wide market range and the like, and is widely applied to the field of eyeground disease examination.
The main performance of the fundus camera includes resolution, field angle, diopter, power of vision, and the like, and the accuracy of these performance indexes directly relates to the effectiveness of diagnosis. With the development of the technology, the traditional fundus camera has more refined branches, such as a fundus camera specially used for infants, a portable fundus camera, a full-automatic fundus camera and the like, and imaging performance parameters of the fundus camera including resolution and a visual field angle are greatly improved. Therefore, the performance parameters of the fundus camera need to be detected and calibrated to ensure that the fundus camera can meet the current international and national industry standards.
The existing fundus camera detection and calibration devices are generally divided into two categories: one is a detection and calibration curtain, wherein a detection and calibration curtain containing a resolution line pair, a view field graduated scale and a fixed length scale is placed at a position 1m away from the exit pupil of the fundus camera, the resolution line pairs at the center (view field center), the middle (half view field position) and the edge (maximum view field position) of the curtain are respectively observed, and the resolution, the view field angle and the magnification of the center, the middle and the edge of the device are obtained according to the maximum observable view field scale and the length of the fixed length scale on the negative. The detection and calibration method usually has high requirements on the precision of the curtain and the precision of the distance between the curtain and the fundus camera, and is not easy to realize in narrow space of hospitals and crowded crowd environments.
The other type is a model eye for simulating the structure of human eyes, the structure of the existing model eye is complex, the model specifications of detection and calibration instruments of fundus cameras of different manufacturers and models are not uniform, the model eye is difficult to assemble, and the model eye has no universality; in addition, generally, one model can only simulate one eye condition, so that the equipment cost for detecting and calibrating the fundus camera is higher, and the popularization is not facilitated.
SUMMERY OF THE UTILITY MODEL
The purpose of this application lies in: to provide a fundus camera inspection aligner which has a simple structure and a low cost and can simulate a variety of ocular lesions.
The application provides a calibration instrument for fundus camera detection, the calibration instrument comprising: fixing base, support and model eye, the bottom of support is fixed in the top of fixing base, and the model eye is installed at the top of support, and the model eye includes: the bionic cornea and the bionic lens are sequentially installed in the through hole, wherein the rear lens barrel is a cylinder, a hemispherical cavity is arranged on one side of the rear lens barrel, the rear lens barrel is connected with the front lens barrel, the hemispherical cavity is communicated with the through hole to simulate a human eye structure, and the plurality of resolution ratio plates are arranged on the inner wall of the hemispherical cavity.
Among the above-mentioned any technical scheme, further, the inside through-hole of preceding lens cone is the multistage through-hole that the diameter distributes from little to big, and wherein, one-level through-hole sets up in the front end of preceding lens cone, and the second grade through-hole sets up in the rear side of one-level through-hole, and the model eye still includes: a corneal frame and a lens frame,
wherein, the center of the cornea mirror bracket is provided with a cornea mounting hole, the cornea mirror bracket is adhered to the rear side of the first-level through hole through a sealant, the cornea mounting hole is used for mounting a bionic cornea,
the lens frame is arranged on the rear side of the secondary through hole, and the lens mounting hole is used for mounting a bionic lens.
In any of the above technical solutions, further, the center of the hemispherical cavity in the rear barrel is located on the centerline of the lens mounting hole.
In any one of the above technical solutions, further, the edge of the lens frame is provided with a plurality of transverse through holes so that a liquid medium can be filled between the bionic lens and the bionic cornea.
In any one of the above technical solutions, further, a plurality of concentric rings are arranged on the inner wall of the hemispherical cavity, a first mounting groove is arranged at the position of the center of the concentric ring, and a second mounting groove is arranged between the plurality of concentric rings, wherein the second mounting grooves between different concentric rings are distributed along the radial direction of the concentric rings, the included angle between adjacent second mounting grooves on the same concentric ring is 90 °, and the first mounting groove and the second mounting groove are used for mounting the resolution ratio board.
In any of the above technical solutions, further, the first mounting groove and the second mounting groove are square grooves, and a vertical central line of the square groove is parallel to a cylindrical surface of the rear barrel, so that the resolution plate is parallel to a plane of the rear barrel.
In any of the above technical solutions, further, the second mounting grooves between different concentric rings are sequentially written as a secondary center mounting groove, a secondary edge mounting groove, and an edge mounting groove from inside to outside, wherein an included angle between a connecting line between center points of two secondary center mounting grooves located at opposite sides and the center of the concentric ring is 40 °, wherein an included angle between a connecting line between center points of two secondary edge mounting grooves located at opposite sides and the center of the concentric ring is 80 °, and wherein an included angle between a connecting line between center points of two edge mounting grooves located at opposite sides and the center of the concentric ring is 120 °.
In any one of the above technical solutions, further, the model eye further includes: the lens barrel comprises a sealing groove and a sealing rubber ring, wherein the sealing groove is arranged at the mounting end of the rear lens barrel and is positioned on the outer side of the hemispherical cavity, and the sealing rubber ring is mounted in the sealing groove so as to enable the front lens barrel to be connected with the rear lens barrel in a sealing mode.
In any of the above technical solutions, further, a liquid medium is filled between the front barrel and the rear barrel.
In any one of the above technical solutions, further, the calibration fixture further includes: the outer tube and the diopter frame, wherein, the outer wall of front lens cone is located to the one end cover of outer tube, and the diopter frame is installed to the other end of outer tube, and wherein, diopter frame's center department is provided with the dioptric lens mounting hole, and the dioptric lens mounting hole is used for installing the dioptric lens.
The beneficial effect of this application is:
the technical scheme aims to evaluate key performance parameters such as resolution, field angle and diopter of a fundus camera, design and manufacture a simulated eye for metering a fundus camera, and form an optical system of the model eye by utilizing a front lens cone, a rear lens cone and a cornea frame, a lens frame, a bionic cornea and a bionic lens which are arranged on the front lens cone so as to simulate physiological structures, optical parameters and refractive characteristics of real human eyes. And the detection and calibration of the fundus camera are realized by arranging resolution plates at different positions of the rear lens cone. Through verifying that the check gauge in this application not only can examine and determine traditional fundus camera, can also measure and detect the fundus camera, portable fundus camera, full-automatic fundus camera etc. that are used for the infant specially, the precision is high, application scope is wide, easy operation, stable performance and portable.
In a preferred implementation manner of the application, the calibration apparatus is further provided with an outer sleeve and a diopter frame, and the diopter frame is used for simulating near and far people by adjusting the diopter number of the diopter lens, so that the applicability of the calibration apparatus is improved.
Drawings
The advantages of the above and/or additional aspects of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a front view of a calibration fixture for fundus camera inspection according to one embodiment of the present application;
FIG. 2 is a cross-sectional view of a calibration fixture according to one embodiment of the present application;
fig. 3 is a schematic view of a rear barrel according to an embodiment of the present application;
fig. 4 is a cross-sectional view of a rear barrel according to an embodiment of the present application;
FIG. 5 is a schematic view of a resolution board according to one embodiment of the present application.
Detailed Description
In order that the above objects, features and advantages of the present application can be more clearly understood, the present application will be described in further detail with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, however, the present application may be practiced in other ways than those described herein, and therefore the scope of the present application is not limited by the specific embodiments disclosed below.
As shown in fig. 1 and 2, the present embodiment provides a calibration instrument for fundus camera inspection, the calibration instrument including: fixing base, support and model eye, the bottom of support is fixed in the top of fixing base, and the model eye is installed at the top of support, and the model eye includes: the lens cone comprises a front lens cone 5, a rear lens cone 6, a bionic cornea, a bionic lens and a resolution ratio plate, wherein the front lens cone 5 is a T-shaped cylinder, a through hole is formed in the front lens cone 5, the bionic cornea and the bionic lens are sequentially installed in the through hole, and an installation through hole is formed in the edge of the horizontal portion of the front lens cone 5.
The model eye in this example has the following optical technical parameters:
firstly, the refraction characteristic simulates the refraction tissue of a real human eye and is provided with a cornea, an anterior chamber, a crystalline lens, a vitreous cavity and a retina;
secondly, the curvature of the front surface of the cornea and the thickness of the cornea are designed to be 7.60mm and 0.50mm in thickness by referring to an actual eyeball;
the thickness of the crystalline lens refers to an actual eyeball, and the design value is 4.50 mm;
fourthly, the curvature radius of the retina refers to the actual eyeball, and the design value is 12.50 mm;
the axial length refers to the actual eyeball, and the design value is 25 mm;
sixthly, the refractive characteristics simulate the actual human eye refractive tissue, and the equivalent air focal length is 17 mm. Based on the above conditions, ZEMAX design is adopted, and the preset parameter Gen (aperture size) refers to the diameter of the pupil of 2-5mm when the human eye clearly views objects, and the diameter of the designed entrance pupil is 4 mm; the preset parameter Fie (field of view) refers to the clear photosensitive area of an actual human eye by 5-8 degrees, and the maximum field of view 2 omega is designed to be 20 degrees; the preset parameters Wav (wavelength) refer to the general requirements of the industry standard YY 0634-: the wavelength is 520nm to 560nm, and the visible light range (F ', e, C' light) is selected.
Further, the inside through-hole of front lens cone 5 is the multistage through-hole that the diameter distributes from small to big, and the through-hole is the echelonment, and the through-hole divide into the two-stage at least, and wherein, one-level through-hole sets up in the front end of front lens cone 5, and the second grade through-hole sets up in the rear side of one-level through-hole, and the model eye still includes: the cornea frame 3 and the lens frame 4, wherein, the center department of the cornea frame 3 is provided with the cornea mounting hole, and the cornea frame 3 passes through sealed glue and bonds in the rear side of one-level through-hole, and the cornea mounting hole is used for installing bionic cornea.
Specifically, the bionic cornea in the embodiment is made of an H-K9 glass material by using an optical processing technology. The cornea structure of the human eye is simulated by the cornea frame 3 and the bionic cornea.
In the embodiment, a lens mounting hole is formed in the center of the lens frame 4, the midline of the lens mounting hole coincides with the midline of the cornea mounting hole, the lens frame 4 is mounted on the rear side of the secondary through hole, and the lens mounting hole is used for mounting a bionic lens, wherein the bionic lens is made of H-K9 glass material and is manufactured by using an optical processing technology.
Specifically, the midline of the lens mounting hole coincides with the midline of the cornea mounting hole, and the midline of the two is used as the axis of the human eye.
Further, the edge of the lens frame 4 is provided with a plurality of transverse through holes so that a liquid medium can be filled between the bionic lens and the bionic cornea.
Specifically, the cornea frame 3 is arranged above the first-stage through hole, the lens frame 4 is arranged above the second-stage through hole, the distance between the first-stage through hole and the second-stage through hole in the front lens barrel 5, namely the depth of the second-stage through hole, is adjusted, a space can be formed between the bionic cornea and the bionic lens, and a plurality of transverse through holes are formed in the edge of the lens frame 4, so that liquid media such as water can be injected into the space, and the anterior chamber of a human eye can be simulated.
The lens frame 4 and the second-stage through hole in the embodiment are connected through screws, so that liquid media can be removed and cleaned, and the calibration tool can work normally.
In this embodiment, the rear barrel 6 is a cylinder, a hemispherical cavity is disposed on one side of the rear barrel 6, a mounting screw hole is disposed at the edge of the mounting end of the rear barrel 6 so as to be matched with a mounting through hole in the front barrel 5, the front barrel 5 is mounted on the rear barrel 6, after the rear barrel 6 is connected with the front barrel 5, the hemispherical cavity is communicated with the through hole to simulate a human eye structure, wherein the plurality of resolution plates are disposed on the inner wall of the hemispherical cavity of the rear barrel 6.
Preferably, the center of the hemisphere shaped cavity in the posterior barrel 6 is located on the midline of the lens mounting hole.
In the embodiment, the retina is simulated by using the hemispherical cavity in the rear lens cone 6, and the near-far vision people with different degrees are simulated by arranging the resolution plates at different positions of the hemispherical cavity and combining the refractors with different refractive powers.
Further, the model eye further includes: the lens barrel comprises a sealing groove 9 and a sealing rubber ring, wherein the sealing groove 9 is arranged at the mounting end of the rear lens barrel 6, the sealing groove 9 is positioned on the outer side of the hemispherical cavity, the sealing rubber ring is mounted in the sealing groove 9 so that the front lens barrel 5 is in sealing connection with the rear lens barrel 6, and a liquid medium is filled between the front lens barrel 5 and the rear lens barrel 6.
Specifically, the front lens cone 5 and the rear lens cone 6 are hermetically connected to simulate a vitreous cavity of a human eye, and a liquid medium, which can be water or other liquid, is injected to simulate the vitreous cavity liquid diseases such as muscae volitantes and the like.
The front lens cone 5, the rear lens cone 6 and the cornea frame 3, the lens frame 4, the bionic cornea and the bionic lens arranged on the front lens cone 5 in the embodiment jointly form an optical system of the model eye to simulate the human eye. And detection calibration of the fundus camera is realized by arranging resolution plates at different positions of the rear lens barrel 6.
Through test detection, the model eye in the embodiment has an optical system evaluation function of 0.20, the values of MTF curves of all fields at 100lp/mm are all larger than 0.5, the focal length is 16.99mm, the axial length is 25.03mm, all indexes meet the design requirements, and the model eye has good optical characteristics.
Further, as shown in fig. 3 and 4, a plurality of concentric rings 7 are arranged on the inner wall of the hemispherical cavity, a first mounting groove 8 is arranged at the position of the center of circle of the concentric rings 7, and second mounting grooves are arranged between the concentric rings 7, wherein the second mounting grooves between different concentric rings 7 are distributed along the radial direction of the concentric rings 7, the included angle between adjacent second mounting grooves on the same concentric rings 7 is 90 °, and the first mounting groove 8 and the second mounting groove are used for mounting a resolution ratio plate.
In this embodiment, an included angle between one concentric ring closest to the center of the concentric ring and the center of the concentric ring is set to be 30 °, and then a difference between included angles between two adjacent concentric rings and the center of the concentric ring is 10 °, that is, an initial value of the field scale is 30 ° and a grid value is 10 °. The maximum field angle test range is set to be 150 degrees, and the detection of the field angle of most fundus cameras on the market can be met.
Preferably, the inner wall of the hemispherical cavity is provided with a water injection hole so as to inject a liquid medium into the hemispherical cavity.
Further, the first mounting groove 8 and the second mounting groove are square grooves, and a vertical center line of the square groove is parallel to the cylindrical surface of the rear barrel 6, so that the resolution plate is parallel to the plane of the rear barrel 6.
Specifically, use precision machining technology on the inner wall of hemisphere cavity, make a plurality of concentric circles 7, and process a plurality of mounting grooves that are the cross form and distribute on a plurality of concentric circles 7, including being located the first mounting groove 8 of 7 centre of a circle positions departments of concentric circles, and be located the secondary center, the second mounting groove at secondary edge and edge, because first mounting groove 8 and each second mounting groove level set up, consequently, can place the resolution ratio board that processes in the mounting groove of square with the upward form of processing resolution ratio line pair face, it is sticky fixed, can detect the fundus camera resolution ratio of high accuracy.
Further, the second mounting grooves between the different concentric rings 7 are sequentially recorded as a secondary center mounting groove, a secondary edge mounting groove and an edge mounting groove from inside to outside, wherein an included angle between a connecting line between the center points of the two secondary center mounting grooves located at the opposite sides and the center of the concentric rings 7 is 40 °, an included angle between a connecting line between the center points of the two secondary edge mounting grooves located at the opposite sides and the center of the concentric rings 7 is 80 °, and an included angle between a connecting line between the center points of the two edge mounting grooves located at the opposite sides and the center of the concentric rings 7 is 120 °.
Specifically, the observable angle of the placing position of the resolution plate is set to be 0-120 degrees, so that three positions with the viewing angles of 0 degrees, 40 degrees, 80 degrees and 120 degrees are selected to respectively correspond to the first mounting groove 8, the secondary center, the secondary edge and the second mounting groove on the edge one by one. Through the above arrangement, thirteen resolution plates are collectively arranged in the rear barrel 6 of the model eye, so as to realize parameter detection of the center resolution and the edge resolution.
The embodiment also shows an implementation manner of the resolution board, as shown in fig. 5, the resolution board is a cuboid of 2 × 2 × 1mm, and micrometer-scale resolution line pairs are processed on the upper surface of the square of the resolution board as a tool for detecting the resolution capacity of the optical imaging device.
The resolution board was designed based on 1951-USAF resolution board, and 10 sets of line pairs were provided, wherein the line pairs of each set were designed with dimensions of 50 μm, 25 μm, 16.667 μm, 12.5 μm, 10 μm, 8.333 μm, 7.143 μm, 6.25 μm, 5.556 μm, and 5 μm, respectively, and the corresponding resolutions were 10lp/mm, 20lp/mm, 30lp/mm, 40lp/mm, 50lp/mm, 60lp/mm, 70lp/mm, 80lp/mm, 90lp/mm, and 100lp/mm, respectively.
Further, the calibration fixture further comprises: the outer tube 2 and the diopter frame 1, wherein, the outer wall of front lens cone 5 is located to the one end cover of outer tube 2, and diopter frame 1 is installed to the other end of outer tube 2, and the center department of diopter frame 1 is provided with the dioptric lens mounting hole, and the dioptric lens mounting hole is used for installing the dioptric lens.
In particular, the near and far vision eyes mostly have images not fallen on the surface of the retina due to the change of the refractive power of the crystalline lens; imaging behind the retina, being a hyperopic eye; the image is in front of the retina, and is a myopic eye. Therefore, in order to make the calibration instrument in the embodiment meet the requirements of near and far vision calibration, an outer sleeve 2 and a diopter frame 1 are further provided, wherein a diopter lens mounting hole is formed in the center of the diopter frame 1 for mounting the diopter lens. By adjusting the dioptric lenses with different dioptric powers, such as 10D, 5D and 2D diopters, the population with severe, moderate and mild hyperopic vision can be simulated.
According to the formula of single refraction spherical diopter, see formula 1, the formula of simultaneous power definition, see formula 2:
wherein l is an object distance, l ' is an image distance, n1 is an object-side refractive index, n ' is an image-side refractive index, r is a spherical radius of curvature, u is an object-side aperture angle, u ' is an image-side aperture angle, and h is an incident height.
Making incident light be a parallel light beam, wherein u is 0; when the object distance l is infinite, the image distance l 'tends to the image focal length f';
there is also a calculation formula:
the calculation formula 3 of the single refraction spherical power can be obtained:
for thick lens imaging, the lens can be regarded as a system formed by two single-refraction spherical surfaces, and the formula 4 is calculated according to the imaging diopter of the combined optical system:
in the formula, D1For the first refracting spherical power, D2Is the second refracting spherical power, n2 is the lens refractive index, d is the lens thickness.
For convenience of calculation, we choose a plano-convex/plano-concave lens to simulate near/far vision, when the back surface is a plane, r2→∞，D2The thickness d of the lens can be any value at this time, and for the convenience of processing, the PMMA material is taken, and d is designed to be 3. The back surface of the lens was specified to be 12mm from the corneal vertex of the model eye with reference to the lens-to-eye distance at the time of fitting, and the design results are shown in Table 2 below.
TABLE 2
| Type (B) | Severe myopia | Moderate myopia | Mild myopia | Slight hyperopia | Moderate hyperopia | Severe hyperopia |
| diopter/D | -10 | -5 | -2 | 2 | 5 | 10 |
| Radius of curvature | 49.1756 | 98.3512 | 245.878 | -245.878 | -98.3512 | -49.1756 |
In the embodiment, the added refractor forces the incident parallel light to converge/diverge before entering the bionic cornea, and the incident parallel light is focused in front of/behind the hemispherical cavity of the rear lens cone 6 after passing through the model eye optical system, so as to simulate near/far vision.
The technical scheme of the present application is explained in detail above with reference to the accompanying drawings, and the present application provides a calibration instrument for fundus camera detection, which comprises: fixing base, support and model eye, the bottom of support is fixed in the top of fixing base, and the model eye is installed at the top of support, and the model eye includes: the bionic cornea and the bionic lens are sequentially installed in the through hole, wherein the rear lens barrel is a cylinder, a hemispherical cavity is arranged on one side of the rear lens barrel, the rear lens barrel is connected with the front lens barrel, the hemispherical cavity is communicated with the through hole to simulate a human eye structure, and the plurality of resolution ratio plates are arranged on the inner wall of the hemispherical cavity. Through the technical scheme in this application, provide a simple structure, the low-cost calibration apparatus that can be applicable to different specification models eye ground camera to can simulate multiple eye pathological change, improve calibration apparatus's reliability.
In the present application, the terms "mounted," "connected," "fixed," and the like are used in a broad sense, and for example, "connected" may be a fixed connection, a detachable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
The shapes of the various elements in the drawings are illustrative and do not preclude the existence of certain differences from the actual shapes, and the drawings are used for the purpose of illustrating the principles of the present application and are not intended to limit the present application.
Although the present application has been disclosed in detail with reference to the accompanying drawings, it is to be understood that such description is merely illustrative and not restrictive of the application of the present application. The scope of the present application is defined by the appended claims and may include various modifications, adaptations, and equivalents of the subject application without departing from the scope and spirit of the present application.
Claims (10)
1. A calibration instrument for fundus camera inspection, the calibration instrument comprising: fixing base, support and model eye, the bottom of support is fixed in the top of fixing base, install at the top of support the model eye, the model eye includes: a front lens cone (5), a rear lens cone (6), a bionic cornea, a bionic lens and a resolution plate,
wherein, the inner part of the front lens cone (5) is provided with a through hole, the bionic cornea and the bionic lens are sequentially arranged in the through hole,
wherein, the rear lens cone (6) is a cylinder, one side of the rear lens cone (6) is provided with a hemispherical cavity, after the rear lens cone (6) is connected with the front lens cone (5), the hemispherical cavity is communicated with the through hole to simulate the structure of human eyes,
wherein, a plurality of resolution ratio boards set up in the inner wall of hemisphere cavity.
2. The calibrator for fundus camera inspection according to claim 1, wherein the through holes inside the front barrel (5) are multi-stage through holes having diameters distributed from small to large, wherein a first-stage through hole is provided at the front end of the front barrel (5) and a second-stage through hole is provided at the rear side of the first-stage through hole, the model eye further comprising: a cornea frame (3) and a lens frame (4),
wherein, the center of the cornea mirror bracket (3) is provided with a cornea mounting hole, the cornea mirror bracket (3) is adhered to the rear side of the first-level through hole through a sealing gum, the cornea mounting hole is used for mounting the bionic cornea,
the center of the lens frame (4) is provided with a lens mounting hole, the midline of the lens mounting hole is superposed with the midline of the cornea mounting hole, the lens frame (4) is mounted on the rear side of the secondary through hole, and the lens mounting hole is used for mounting the bionic lens.
3. Calibration device for fundus camera inspection according to claim 2, characterized in that the sphere centre of the hemispherical cavity in the rear barrel (6) is located on the midline of the lens mounting hole.
4. Calibration device for fundus camera inspection according to claim 2 characterized in that the edge of the lens holder (4) is provided with a plurality of transversal through going holes to enable filling of liquid medium between the biomimetic lens and the biomimetic cornea.
5. The calibration instrument for fundus camera inspection according to claim 1, wherein a plurality of concentric rings (7) are provided on the inner wall of said hemispherical cavity, a first mounting groove (8) is provided at the position of the center of the concentric rings (7), a second mounting groove is provided between a plurality of said concentric rings (7),
wherein the second mounting grooves between different concentric rings (7) are distributed along the radial direction of the concentric rings (7), the included angle between the adjacent second mounting grooves on the same concentric rings (7) is 90 degrees,
wherein the first mounting groove (8) and the second mounting groove are used for mounting the resolution plate.
6. The calibration instrument for fundus camera inspection according to claim 5, wherein said first mounting groove (8) and said second mounting groove are square grooves having vertical median lines parallel to the cylindrical surface of said rear barrel (6) so that said resolution plate is disposed parallel to the plane of said rear barrel (6).
7. Calibration device for fundus camera inspection according to claim 5, characterized in that the second mounting grooves between the different concentric rings (7) are sequentially written from inside to outside as a sub-central mounting groove, a sub-edge mounting groove and an edge mounting groove,
wherein the included angle between the connecting line between the center points of the two sub-center mounting grooves on the opposite side and the circle center of the concentric ring (7) is 40 degrees,
wherein the included angle of the connecting line between the center points of the two secondary edge mounting grooves positioned at the opposite sides and the circle center of the concentric ring (7) is 80 degrees,
wherein, the included angle between the connecting line between the center points of the two edge mounting grooves at the opposite sides and the center of the concentric ring (7) is 120 degrees.
8. The calibration instrument for fundus camera inspection according to claim 1, wherein said model eye further comprises: a sealing groove (9) and a sealing rubber ring,
wherein the sealing groove (9) is arranged at the mounting end of the rear lens barrel (6), the sealing groove (9) is positioned at the outer side of the hemispherical cavity,
the sealing rubber ring is arranged in the sealing groove (9) so that the front lens cone (5) is connected with the rear lens cone (6) in a sealing mode.
9. Calibration instrument for fundus camera inspection according to claim 8, characterized in that a liquid medium is filled between the front barrel (5) and the rear barrel (6).
10. Calibration device for fundus camera inspection according to any of claims 1 to 9, characterized in that it further comprises: an outer sleeve (2) and a diopter frame (1),
wherein one end of the outer sleeve (2) is sleeved on the outer wall of the front lens barrel (5), the other end of the outer sleeve (2) is provided with the diopter lens frame (1),
the center of the diopter lens frame (1) is provided with a diopter lens mounting hole, and the diopter lens mounting hole is used for mounting a diopter lens.
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