A subjective optometry system and device

Abstract

The present application relates to a subjective optometry system and device, belonging to the field of optometry, wherein the subjective optometry system comprises a plane reflector, a positive focal lens group of at least one lens, and a diopter arranged in sequence along an optical axis, wherein the plane reflector is movable along the optical axis; when the real image formed by the positive focal lens group is located at the side focus of the plane reflector, the subjective optometry system detects a diopter of zero; the focal length of the positive focal lens group is f, the moving range of the plane reflector is d, and d and f satisfy the following relationship: 0<d<2f. The subjective optometry device using the subjective optometry system eliminates the size deformation of the sight mark after passing through the lens, ensures the accuracy of vision detection, is portable, and realizes astigmatism detection that can be independently operated by an individual.

Description

Technical Field

[0001] The present application relates to the field of optometry, and in particular to a subjective optometry system and a subjective optometry device based on the system. Background Art

[0002] With the popularization of the Internet and intelligent terminal devices, the application of mobile phones in daily life has spread to all aspects. Watching the mobile phone screen for a long time can cause vision damage. The continuous increase in the myopia rate among teenagers in recent years is not unrelated to the use of mobile phones. People usually use a vision chart to test their own vision, but the vision chart can only roughly reflect the vision of the eyes. By the time the vision is found to be impaired through the vision chart, the vision damage is often quite serious. In order to better prevent vision damage and prepare for vision protection as soon as possible, it is necessary to have a more detailed understanding of your vision in advance. A portable and quick-to-operate vision detection device is a convenient way to understand the exact vision parameters.

[0003] Applications with publication numbers CN105662329A and CN109567736A fail to eliminate the change in the visual angle in the test eye caused by the sight mark passing through the lens, which will lead to inaccurate test results; application with publication number TW202402229A is limited by its optical structure and cannot detect astigmatism. Summary of the invention

[0004] In view of the above-mentioned defects of the prior art, the present application provides an optical subjective optometry system and a subjective optometry device based on the above-mentioned system.

[0005] The technical solution of the present invention is as follows: a subjective optometry system, comprising a plane reflector, a positive power lens group of at least one lens, and a spectroscope arranged in sequence along an optical axis, wherein the plane reflector is movable along the optical axis; when the real image formed by the positive power lens group is located at the side focus of the plane reflector, the subjective optometry system detects that the refractive power is zero; the focal length of the positive power lens group is f, the moving range of the plane reflector is d, and d and f satisfy the following relationship: 0<d<2f.

[0006] Furthermore, when the positive focal length lens group is composed of a spherical lens and a cylindrical lens, the cylindrical lens is composed of two groups of cylindrical lenses, cylindrical lens A and cylindrical lens B, each group of at least one cylindrical lens having the same optical focal length; the two groups of cylindrical lenses are rotatable, the rotation axes of the two groups of cylindrical lenses are coaxial with the optical axis, the intersection of the cylindrical lens axes of the two groups of cylindrical lenses is located on the optical axis, and the cylindrical lens axes of the two groups of cylindrical lenses are perpendicular to the optical axis.

[0007] Furthermore, the reflecting surface of the plane reflector forms an angle of 90 degrees with the optical axis, and the reflecting surface of the beam splitter forms an angle of 45 degrees with the optical axis.

[0008] Furthermore, it is detected that the eye is located on the optical axis, and the distance between the light-transmitting surface of the near-eye end of the beam splitter and the cornea of ​​the eye is consistent with the lens-eye distance of the eye wearing frame glasses.

[0009] Furthermore, the sight mark used for detection by the subjective optometry system is an international or domestic standard sight mark on a vision chart, or other sight marks made according to vision detection standards, or other devices with a detection distance determined by the subjective optometry system.

[0010] A subjective optometry device adopts the above-mentioned subjective optometry system and also includes a diopter adjustment device and a diopter display device. The diopter adjustment device is used to drive the plane reflector to move along the optical axis, and the diopter display device is used to display the detected diopter of the subjective optometry device according to the position of the plane reflector on the optical axis.

[0011] Furthermore, it includes the subjective optometry device body, the positive focal lens group is fixedly arranged at the near-eye end of the subjective optometry device body, the subjective optometry device body is provided with a movable lens barrel as the diopter adjustment device, the plane reflector is fixed to the movable lens barrel, the movable lens barrel enables the plane reflector to move along the optical axis, the diopter display device includes a diopter pointer and a diopter scale, the diopter pointer and the diopter scale are respectively connected to the movable lens barrel and the subjective optometry device body, and when the movable lens barrel moves, the position of the diopter pointer on the diopter scale is changed to display the detected diopter of the subjective optometry device.

[0012] Another subjective optometry device adopts the above-mentioned subjective optometry system, and specifically also includes: a diopter adjustment device and a diopter display device, an astigmatism adjustment device and an astigmatism display device, an astigmatism axis adjustment device and an astigmatism axis display device; the diopter adjustment device is used to drive the plane reflector to move along the optical axis, and the diopter display device is used to display the detected diopter of the subjective optometry device according to the position of the plane reflector on the optical axis; the astigmatism adjustment device is used to drive the two groups of cylindrical lenses to present different cylindrical axis angles, and the astigmatism display device is used to display the calculated astigmatism according to the different cylindrical axis angles of the two groups of cylindrical lenses; the astigmatism axis adjustment device is used to drive the two groups of cylindrical lenses to rotate synchronously with the optical axis as the axis, and the astigmatism axis display device is used to display the detected astigmatism axis of the subjective optometry device at the circumferential position of the optical axis according to the angular bisector of the cylindrical axis angle of the two groups of cylindrical lenses.

[0013] Furthermore, the invention comprises a subjective optometry device body, wherein the spherical lens and two groups of cylindrical lenses, the cylindrical lens A and the cylindrical lens B, are arranged on a rotatable lens barrel at the near-eye end of the subjective optometry device; the rotatable lens barrel has two parts, namely, a lens barrel to which the spherical lens and the cylindrical lens A are fixed and a lens barrel to which the cylindrical lens B is fixed; the subjective optometry device is provided with a movable lens barrel as the diopter adjustment device, the plane reflector is fixed to the movable lens barrel, the movable lens barrel enables the plane reflector to move along the optical axis, and the diopter display The device comprises a diopter pointer and a diopter scale, wherein the diopter pointer and the diopter scale are respectively connected to the movable lens barrel and the subjective optometry device body, and when the movable lens barrel moves, the position of the diopter pointer on the diopter scale is changed to display the detected diopter of the subjective optometry device; the astigmatism adjustment device and the astigmatism display device are composed of the lens barrel of the cylindrical lens B and the lens barrel of the cylindrical lens A, and when the astigmatism adjustment device and the astigmatism display device are used, the lens barrel of the cylindrical lens B can be The cylindrical lens B is rotated separately, and when the lens barrel of the cylindrical lens B rotates, the angle between the cylindrical lens axis of the cylindrical lens B and the cylindrical lens A is changed, so that the two groups of cylindrical lenses can be combined to produce different astigmatism. The astigmatism display device is composed of an astigmatism pointer and an astigmatism scale respectively connected to the lens barrel of the cylindrical lens B and the lens barrel of the cylindrical lens A. The rotation of the lens barrel of the cylindrical lens B drives the position change of the astigmatism pointer on the astigmatism scale to achieve the purpose of displaying the astigmatism detected by the subjective optometry device; the rotatable lens barrel is connected to the subjective optometry device. The optical device body serves as the astigmatism axis adjustment device and the astigmatism axis display device. When serving as the astigmatism axis adjustment device and the astigmatism axis display device, the two rotatable lens barrels can rotate synchronously. The lens barrel of the cylindrical lens A is connected with an astigmatism axis pointer, and the subjective refraction device body is connected with an astigmatism axis scale. When the rotatable lens barrel rotates, the astigmatism degree pointer and the astigmatism axis pointer on the astigmatism axis scale are driven to change their positions, so as to achieve the purpose of displaying and detecting the astigmatism axis by the subjective refraction device.

[0014] The technical solution provided by the present invention has the following advantages:

[0015] The subjective optometry device using the subjective optometry system eliminates the size deformation of the sight mark after passing through the lens, ensures the accuracy of vision detection, is portable and realizes astigmatism detection that can be independently operated by individuals. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of the optical structure of the subjective optometry system of an embodiment;

[0017] Figure 2 1 is a schematic diagram of a local structure when the positive focal power lens group of the embodiment is composed of a spherical lens and a cylindrical lens A and a cylindrical lens B;

[0018] Figure 3 is a schematic cross-sectional structural diagram of the subjective optometry device of Example 1;

[0019] Figure 4 is a schematic cross-sectional structural diagram of a subjective optometry device of Example 2;

[0020] Figure 5 is a schematic diagram of a diopter scale of Example 2;

[0021] Figure 6 is a schematic diagram of the astigmatism pointer and the astigmatism scale of Example 2;

[0022] Figure 7 It is a schematic diagram of the astigmatism axis pointer and the astigmatism axis scale of Example 2.

[0023] Description of reference numerals:

[0024] 1. Plane reflector; 2. Lens group; 3. Beam splitter; 4. Eye; 5. Sight mark; 11. Moving lens barrel; 12. Lens barrel; 13. Beam splitter barrel; 21. Spherical lens; 22. Cylindrical lens A; 23. Cylindrical lens B; 31. Diopter pointer; 32. Diopter scale; 41. Astigmatism pointer; 42. Astigmatism scale; 51. Astigmatism axis pointer; 52. Astigmatism axis scale; 121. The lens barrel of cylindrical lens A; 122. The lens barrel of cylindrical lens B. DETAILED DESCRIPTION

[0025] The present invention is further described below in conjunction with examples. It should be understood that these examples are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading this description, various equivalent modifications to the description by technicians all fall within the scope defined by the claims of this application.

[0026] Embodiment, the optical structure of the subjective optometry system involved in this embodiment is as follows Figure 1 As shown, it includes a plane reflector 1, a positive focal lens group 2 of at least one lens, and a diopter 3 arranged in sequence along the optical axis, wherein the plane reflector 1 is movable along the optical axis; when the real image formed by the positive focal lens group 2 is located at the side focus of the plane reflector 1, the refractive power detected by the subjective optometry system is zero; the focal length of the positive focal lens group 2 is f, the moving range of the plane reflector 1 is d, and d and f satisfy the following relationship: 0<d<2f.

[0027] When the positive focal length lens group 2 is composed of a spherical lens 21 and a cylindrical lens, the cylindrical lens is composed of two groups of cylindrical lenses, cylindrical lens A22 and cylindrical lens B23, each group of which has at least one cylindrical lens with the same optical focal length; the two groups of cylindrical lenses are rotatable, the rotation axes of the two groups of cylindrical lenses are coaxial with the optical axis, the intersection of the cylindrical lens axes of the two groups of cylindrical lenses is located at the optical axis, and the cylindrical lens axes of the two groups of cylindrical lenses are perpendicular to the optical axis.

[0028] The reflecting surface of the plane reflector 1 is at an angle of 90 degrees to the optical axis, and the reflecting surface of the beam splitter 3 is at an angle of 45 degrees to the optical axis, so as to ensure that the light from the sight mark 5 can enter the detection eye 4 after passing through the beam splitter 3 and the positive focal lens group 2 and then being reflected by the plane reflector 1 and passing through the positive focal lens group 2 again.

[0029] When the subjective optometry system performs detection, it detects that the eye 4 is on the optical axis, and the distance between the light-transmitting surface of the near-eye end of the dichroic mirror 3 and the cornea of ​​the eye 4 is consistent with the eye-eye distance of the eye wearing frame glasses.

[0030] The standard eye chart sight marks used in daily life generally have clear detection distance requirements when conducting vision tests. For example, the detection distances of common eye charts in China are five meters and three meters. The subjective optometry system also has detection distance requirements. For example, if a eye chart sight mark with a detection distance requirement of three meters is used, a subjective optometry system with a detection distance of three meters should be used. If the optometry board sight mark that is reduced in size according to the vision testing standard is used within the subjective optometry system, there is no detection distance requirement for the tester. The sight mark used for detection in the subjective optometry system is a sight mark of an international or domestic standard vision chart or other sight marks made according to the vision detection standard or other devices of the detection distance determined by the subjective optometry system, hereinafter referred to as sight mark 5. The distance between the sight mark 5 and the optical center of the positive focal lens group 2 is greater than twice the focal length of the positive focal lens group 2. The light from the sight mark 5 is reflected by the reflection surface of the diopter 3 and passes through the positive focal lens group 2 to form a real image near its image side focus. The real image is reflected by the plane reflector 1 and enters the eye 4 of the tester through the positive focal lens group 2 and the light-transmitting surface of the diopter 3 again; the positive focal lens group 2 is both an objective lens and an eyepiece in the subjective optometry system, which can effectively eliminate the size deformation of the sight mark caused by the different focal lengths of the objective lens and the eyepiece after passing through the optometry system, especially when performing detection with astigmatism, the accuracy of the diopter detection is guaranteed; when the positive focal lens group 2 is used as an objective lens, the real image of the sight mark formed will change the distance from the optical center when the positive focal lens group 2 is used as an eyepiece as the plane reflector 1 moves. The distance between the sight mark 5 and the optical center of the positive focal lens group 2 remains unchanged, and the change in the distance between the real image formed when the positive focal lens group 2 is driven as an objective lens and the optical center when the positive focal lens group 2 is used as an eyepiece is realized by the plane reflecting mirror 1; when the positive focal lens group 2 is used as an objective lens, when the real image formed by the sight mark is at the side focus of the plane reflecting mirror 1, the detection diopter of the subjective optometry system is zero, when the real image formed by the sight mark is within the above-mentioned focus, the detection diopter is negative optical focality, that is, the real image formed by the sight mark is reflected by the plane reflecting mirror 1 and passes through the positive focal lens group 2 again to form a virtual image, and when the real image formed by the sight mark is outside the above-mentioned focus, the detection diopter is positive optical focality, that is, the real image formed by the sight mark is reflected by the plane reflecting mirror 1 and passes through the positive focal lens group 2 again to form a real image.

[0031] The distance between the real image of the sight mark formed by the positive lens group 2 as an objective lens and the optical center of the positive lens group 2 as an eyepiece is determined by the refractive power of the eye 4 of the subject. When the eye 4 can clearly see the sight mark 5 specified in the vision detection standard through the subjective optometry system, the distance between the real image of the sight mark formed by the positive lens group 2 as an objective lens and the optical center of the positive lens group 2 as an eyepiece is determined. At this time, the real image or virtual image of the sight mark formed by the positive lens group 2 as an objective lens after being reflected by the plane reflector 1 and passing through the positive lens group 2 again falls on the far point of the eye 4 to be detected. In this way, the corrected vision of the eye 4 to be detected is the best. Therefore, the distance from the optical center of the positive lens group 2 to the real image or virtual image formed when the positive lens group 2 is used as an eyepiece can be regarded as the far point distance of the eye 4. Therefore, the refractive power of the eye 4 is equal to the reciprocal of the distance from the optical center of the positive lens group 2 to the real image or virtual image formed when it is used as an eyepiece. At the same time, because of the presence of the beam splitter 3, the distance between the cornea of ​​the eye 4 and the back vertex of the lens of the positive power lens group 2 is greater than the distance between the eyes when the eyes wear frame glasses, so it is necessary to convert the effective degree according to the formula. The formula is as follows:

[0032] Fs=Fo / (1-d×Fo)

[0033] Fs is the effective degree, Fo is the degree detected by the subjective optometry system, and d is the distance between the light-transmitting surface near the eye end of the beam splitter and the back vertex of the positive focal lens group.

[0034] The refractive power scale used in the subjective optometry system is a scale converted from effective power and can directly display the effective power of the tested eye.

[0035] When the subjective optometry system is used for testing, the distance between the cornea of ​​the eye 4 and the light-transmitting surface near the eye end of the spectroscope 3 is consistent with the distance between the eye and the frame glasses when the eye is wearing the frame glasses. This distance ensures that the effective diopter of the glasses is consistent with the degree when the subjective optometry system is used for testing.

[0036] Because the sight mark 5 cannot be at infinite distance in theory, the real image of the sight mark 5 formed by the positive focal lens group 2 will not be at the image-side focus of the positive focal lens group 2. According to the distance between the optical center of the sight mark 5 and the positive focal lens group 2 and the focal length of the positive focal lens group 2, the distance between the real image of the sight mark formed by the positive focal lens group 2 as an objective lens and the optical center of the positive focal lens group 2, i.e., the image distance of the sight mark 5, can be calculated by the Gauss imaging formula; combined with the above distances, according to the distance between the reflecting surface of the plane reflector 1 and the optical center of the positive focal lens group 2, the distance between the real image of the sight mark formed by the positive focal lens group 2 as an objective lens and the optical center of the positive focal lens group 2 as an eyepiece can be calculated, and the calculation formula is as follows:

[0037] u2=2d-v1 Formula 1

[0038] u2 is the distance between the real image of the sight mark after being reflected by the plane reflector 1 and the optical center of the positive focal lens group when the positive focal lens group 2 is used as the objective lens, d is the distance between the optical center of the positive focal lens group 2 and the reflecting surface of the plane reflector 1, and v1 is the distance between the real image of the sight mark 5 after passing through the positive focal lens group 2 and the optical center of the positive focal lens group 2.

[0039] According to u2 and the focal length of the positive lens group 2, the distance between the optical center of the positive lens group 2 and the real image or virtual image formed when the positive lens group 2 is used as an eyepiece can be calculated, and the reciprocal of this distance is the diopter of the test subject's eye 4. That is, the Gaussian imaging formula needs to be used twice to calculate the diopter of the test eye through the subjective optometry system.

[0040] The Gaussian imaging formula is as follows: 1 / u+1 / v=1 / f Formula 2

[0041] u is the object distance, v is the image distance, and f is the focal length of the positive power lens group.

[0042] When the Gaussian imaging formula is used for the first time, u is the distance from the sight mark 5 to the optical center of the positive focal lens group 2, and v is the distance from the optical center of the positive focal lens group 2 to the real image formed by the sight mark when it is used as an objective lens; when the Gaussian imaging formula is used for the second time, u is the distance from the real image formed by the sight mark when the positive focal lens group 2 is used as an objective lens to the optical center when the positive focal lens group 2 is used as an eyepiece, and v is the inverse of the refractive power of the detected eye.

[0043] Combining the above formula 1 with formula 2, the formula for calculating the refractive power of the test eye is:

[0044] D=1 / f-(u1-f) / (2d(u1-f)-u1f)

[0045] D is the diopter of the eye being tested, f is the focal length of the positive lens group, u1 is the distance between the sight mark and the optical center of the positive lens group, and d is the distance between the reflective surface of the plane reflector and the optical center of the positive lens group. Therefore, the diopter of the tested eye can be calculated through u1 and d.

[0046] When performing astigmatism detection, the astigmatism detection includes astigmatism degree detection and astigmatism axis position detection. The rotation of the cylindrical lens B23 with the optical axis of the subjective optometry system as the axis can change the angle between the axis of the cylindrical lens A22 and the axis of the cylindrical lens B23, thereby causing the astigmatism degree of the combined cylindrical lens composed of the cylindrical lens A22 and the cylindrical lens B23 to change. The cylindrical lens A22 and the cylindrical lens B23 can also rotate synchronously without changing the angle between the axes of the two, but only changing the circumferential position of the axes of the two on the optical axis of the subjective optometry system, thereby realizing the detection of the astigmatism axis position.

[0047] According to the Thompson formula of the cylindrical lens combination, the astigmatism of the cylindrical lens combination is C, the diopter is D', and the astigmatism axis β is determined by the angle α (α < 90°) between the axis of the cylindrical lens A22 and the axis of the cylindrical lens B23 and the optical focal length E and F of the cylindrical lens A22 and the cylindrical lens B23, that is:

[0048] C 2 =E 2 +F 2 +2EFcos2α

[0049] D`=(E+FC) / 2

[0050] Sin2β=(F / C)sin2α

[0051] When the axis of cylinder A22 and the axis of cylinder B23 are perpendicular, the astigmatism of the combined cylinder is zero. When the angle between the axis of cylinder A22 and the axis of cylinder B23 changes, the astigmatism of the combined cylinder composed of cylinder A22 and cylinder B23 changes, thereby detecting the astigmatism of the eye. When the subjective optometry system detects the astigmatism, because the light from the sight mark 5 passes through the cylinder combination of cylinder A22 and cylinder B23 twice, the astigmatism value obtained by the above formula is actually half of the astigmatism of the astigmatism cylinder composed of cylinder A22 and cylinder B23. Since the above two cylinders can rotate synchronously around the optical axis of the subjective optometry system without changing the angle between the axes of cylinder A22 and cylinder B23, the axis position of the eye astigmatism can be detected, and the axis position of the astigmatism during the detection is the angle bisector of the angle between the axes of cylinder A22 and cylinder B23. As the astigmatism of the combined cylindrical lens composed of the cylindrical lens A22 and the cylindrical lens B23 increases, the refractive power of the combined cylindrical lens will decrease. Therefore, in order to make the refractive power detection more accurate when performing the refractive power detection with astigmatism, the following method can be used: Figure 5 The astigmatism corresponding to the diopter of the combined cylindrical lens composed of the cylindrical lens A22 and the cylindrical lens B23 shown is used as the diopter scale.

[0052] Embodiment 1: A subjective optometry device is manufactured based on the subjective optometry system of the above embodiment. The cross-sectional structure of the subjective optometry device is as follows: Figure 3 As shown, it includes a subjective optometry device body, and the subjective optometry device body is provided with a subjective optometry system. The structure of the subjective optometry device body mainly includes a plane reflector 1, a positive focal lens group 2, and a beam splitter 3 arranged in sequence along the optical axis, the plane reflector 1 is fixed to a movable lens barrel 11, the positive focal lens group 2 is arranged on a lens barrel 12, and the beam splitter 3 is arranged on a beam splitter barrel 13, the movable lens barrel 11 can move axially along the lens barrel 12, the movable lens barrel 11 is connected to a diopter pointer 31, and the lens barrel 12 is connected to a diopter scale 32, and the movement of the movable lens barrel 11 synchronously drives the position change of the diopter pointer 31 on the diopter scale 32 to display the detection diopter of the subjective optometry device.

[0053] Embodiment 2: Based on the subjective optometry system of the above embodiment, another subjective optometry device is manufactured. The cross-sectional structure of the subjective optometry device is as follows: Figure 4 As shown, the subjective optometry device body is provided with a subjective optometry system. The structure of the subjective optometry device body mainly includes a plane reflector 1, a positive focal lens group 2, and a beam splitter 3 arranged in sequence along the optical axis. The positive focal lens group 2 is composed of a spherical lens 21, a cylindrical lens A22, and a cylindrical lens B23. The plane reflector 1 is fixed to a movable lens barrel 11, and the positive focal lens group 2 is arranged in a lens barrel 12. The specific arrangement is that the spherical lens 21 and the cylindrical lens A22 are arranged in a lens barrel 121 of the cylindrical lens A, and the cylindrical lens B23 is arranged in a lens barrel 122 of the cylindrical lens B. The beam splitter 3 is arranged in the beam splitter barrel, and the movable lens barrel 11 can be moved along the lens barrel 11. The lens barrel 12 moves axially, the movable lens barrel 11 is connected to a diopter pointer 31, and the lens barrel 12 is connected to a diopter scale 32. The movement of the movable lens barrel 11 synchronously drives the position change of the diopter pointer 31 on the diopter scale 32 to display the detection diopter of the subjective optometry device; when the astigmatism detection is performed, the lens barrel 122 of the cylinder B can be rotated separately, the lens barrel 122 of the cylinder B is connected to an astigmatism pointer 41, the lens barrel 121 of the cylinder A is connected to an astigmatism scale 42, and the lens barrel 122 of the cylinder B is rotated along the light When the shaft rotates in the circumferential direction, the position of the astigmatism pointer 41 on the astigmatism scale 42 changes to display the astigmatism detected by the subjective ophthalmometer. When the astigmatism pointer 41 points to the value of 0 on the astigmatism scale 42, the axis of the cylinder A22 is perpendicular to the axis of the cylinder B23, that is, the astigmatism of the combined cylinder ball composed of the cylinder A22 and the cylinder B23 is zero. At this time, the subjective ophthalmometer can only detect the diopter but not the astigmatism. When the astigmatism axis position is detected, the lens barrel 122 of the cylinder B and the lens barrel 121 of the cylinder A can be synchronized. Rotate, the lens barrel 121 of cylindrical lens A is connected with an astigmatism axis pointer 51, and the lens barrel 12 is connected with an astigmatism axis scale 52. When the astigmatism axis is detected, the lens barrel 121 of cylindrical lens A and the lens barrel 122 of cylindrical lens B rotate synchronously and drive the astigmatism axis pointer 51 and the astigmatism degree pointer 41 to change the position of the astigmatism axis scale 52 connected to the lens barrel 12 to display the detected astigmatism axis of the subjective ophthalmology device at the position of the astigmatism axis scale 52 through the bisector of the angle between the astigmatism degree pointer 41 and the astigmatism axis pointer 51.

[0054] The detection method using the subjective ophthalmometer of Example 2 is as follows: the detection eye is in a suitable position according to the distance required by the sight mark used, and the astigmatism pointer 41 is pointed to the 0 degree value of the astigmatism scale 42 by rotating the lens barrel 122 of the cylindrical lens B of the subjective ophthalmometer. Cover one eye and use the other eye to observe the sight mark through the subjective ophthalmometer. The subject's left and right hands respectively control the moving lens barrel 11 and the lens barrel 12 of the subjective ophthalmometer, and change the position of the moving lens barrel 11 in the lens barrel 12 axially repeatedly to change the distance between the optical centers of the plane reflector 1 and the positive focal lens group 2 until the sight mark specified in the vision detection standard can be clearly seen. At this time, the diopter indication on the diopter scale 32 pointed to by the diopter pointer 31 is the diopter of the eye being tested. Perform the above method three times and take the average value. Change the eye and repeat the above operation.

[0055] Astigmatism detection: By rotating the lens barrel 122 of the cylindrical lens B, the astigmatism pointer 41 is rotated to the 0.25 or 0.5 scale of the astigmatism scale 42, so that the combined cylindrical lens composed of the cylindrical lens A22 and the cylindrical lens B23 has an astigmatism of 0.25D or 0.5D. Rotate the lens barrel 121 of the cylindrical lens A. If the sight mark is fuzzy at any position, it means that the tested eye has no astigmatism. If it is relatively clear when it is rotated to a certain position and fuzzy at other positions, it means that the tested eye has astigmatism. Further rotate the lens barrel 122 of the cylindrical lens B to adjust the astigmatism degree and push the movable lens barrel 11 to adjust the diopter. You can also rotate the lens barrel 121 of the cylindrical lens A at the same time to adjust the astigmatism axis until you can see the sight mark specified in the vision detection standard clearly. At this time, the optical cross prescription can be obtained according to the diopter value indicated by the diopter pointer 31 on the diopter scale 32, the astigmatism value indicated by the astigmatism pointer 41 on the astigmatism scale 42, the angle of the astigmatism pointer 41 on the astigmatism axis scale 52 and the angle value of the bisector of the angle of the astigmatism axis pointer 51 on the astigmatism axis scale 52.

Claims

1. A subjective optometry system, characterized in that: The invention comprises a plane reflector, a positive power lens group of at least one lens, a beam splitter, and a sight mark arranged in sequence along an optical axis, wherein the plane reflector is movable along the optical axis; the distance between the sight mark and the optical center of the positive power lens group is greater than twice the focal length of the positive power lens group; the light in the direction of the sight mark passes through the positive power lens group after passing through the reflecting surface of the beam splitter and forms a real image near the focus of the positive power lens group; the plane reflector drives the real image to pass through the positive power lens group again and enter the detection eye through the light transmission surface of the beam splitter; When the real image is located at the side focus of the plane reflector, the refractive power detected by the subjective optometry system is zero; The positive power lens group is both an objective lens and an eyepiece in the subjective optometry system. The focal length of the positive power lens group is f. The moving range of the plane reflector is d. d and f satisfy the following relationship: 0<d<2f.

2. The subjective optometry system according to claim 1, characterized in that: The reflecting surface of the plane reflector forms an angle of 90 degrees with the optical axis, and the reflecting surface of the beam splitter forms an angle of 45 degrees with the optical axis.

3. The subjective optometry system according to claim 1, characterized in that: The detection eye is located on the optical axis, and the distance between the light-transmitting surface of the near-eye end of the spectroscope and the cornea of ​​the eye is consistent with the lens-eye distance of the eye when wearing frame glasses.

4. The subjective optometry system according to claim 1, characterized in that: The sight mark used for detection by the subjective optometry system is an international or domestic standard sight mark on a vision chart or other sight marks made according to vision detection standards or other devices with a detection distance determined by the subjective optometry system.

5. A subjective refraction device, using the system according to any one of claims 1 to 4, characterized in that: It comprises a diopter adjustment device and a diopter display device, wherein the diopter adjustment device is used to drive the plane reflector to move along the optical axis, and the diopter display device is used to display the detected diopter of the subjective optometry device according to the position of the plane reflector on the optical axis.

6. The subjective optometry device according to claim 5, characterized in that: The device comprises a subjective optometry device body, wherein the positive power lens group is fixedly arranged at the near-eye end of the subjective optometry device body, the subjective optometry device body is provided with a movable lens barrel as the diopter adjustment device, the plane reflector is fixed to the movable lens barrel, and the movable lens barrel enables the plane reflector to move along the optical axis, and the diopter display device comprises a diopter pointer and a diopter scale, wherein the diopter pointer and the diopter scale are respectively connected to the movable lens barrel and the subjective optometry device body, and when the movable lens barrel moves, the position of the diopter pointer on the diopter scale is changed to display the detected diopter of the subjective optometry device.

7. A subjective refraction device, using the system according to any one of claims 1 to 4, characterized in that: When the positive focal lens group is composed of a spherical lens and a cylindrical lens, the cylindrical lens is composed of two groups of cylindrical lenses, cylindrical lens A and cylindrical lens B, each group of at least one cylindrical lens has the same optical focal length; the two groups of cylindrical lenses are rotatable, the rotation axes of the two groups of cylindrical lenses are coaxial with the optical axis, the intersection of the cylindrical lens axes of the two groups of cylindrical lenses is located at the optical axis, and the cylindrical lens axes of the two groups of cylindrical lenses are perpendicular to the optical axis; specifically comprising: a diopter adjustment device and a diopter display device, an astigmatism adjustment device and an astigmatism display device, an astigmatism axis adjustment device and an astigmatism axis display device; the diopter adjustment device is used to drive the plane reflector to move along the optical axis, the The diopter display device is used to display the detected diopter of the subjective optometry device according to the position of the plane reflector on the optical axis; the astigmatism adjustment device is used to drive the two groups of cylindrical lenses to present different cylindrical axis angles, and the astigmatism display device is used to display the calculated astigmatism according to the different cylindrical axis angles of the two groups of cylindrical lenses; the astigmatism axis position adjustment device is used to drive the two groups of cylindrical lenses to rotate synchronously with the optical axis as the axis, and the astigmatism axis position display device is used to display the detected astigmatism axis position of the subjective optometry device at the circumferential position of the optical axis according to the angular bisector of the cylindrical axis angle of the two groups of cylindrical lenses.

8. The subjective optometry device according to claim 7, characterized in that: The invention comprises a subjective optometry device body, wherein the spherical lens and two groups of cylindrical lenses, the cylindrical lens A and the cylindrical lens B, are arranged on a rotatable lens barrel at the near-eye end of the subjective optometry device; the rotatable lens barrel has two parts, namely, a lens barrel on which the spherical lens and the cylindrical lens A are fixed and a lens barrel on which the cylindrical lens B is fixed; the subjective optometry device is provided with a movable lens barrel as the diopter adjustment device, the plane reflector is fixed on the movable lens barrel, and the movable lens barrel enables the plane reflector to move along the optical axis, and the diopter display device comprises A diopter pointer and a diopter scale, the diopter pointer and the diopter scale are respectively connected to the movable lens barrel and the subjective optometry device body, and when the movable lens barrel moves, the position of the diopter pointer on the diopter scale is changed to display the detected diopter of the subjective optometry device; the astigmatism adjustment device and the astigmatism display device are composed of the lens barrel of the cylindrical lens B and the lens barrel of the cylindrical lens A, and when used as the astigmatism adjustment device and the astigmatism display device, the lens barrel of the cylindrical lens B can be independently The lens barrel of the cylindrical lens B rotates, and when the lens barrel of the cylindrical lens B rotates, the angle between the cylindrical lens axis of the cylindrical lens B and the cylindrical lens A is changed, so that the two groups of cylindrical lenses can be combined to produce different astigmatism. The astigmatism display device is composed of an astigmatism pointer and an astigmatism scale respectively connected to the lens barrel of the cylindrical lens B and the lens barrel of the cylindrical lens A. The rotation of the lens barrel of the cylindrical lens B drives the position change of the astigmatism pointer on the astigmatism scale to achieve the purpose of displaying the astigmatism detected by the subjective optometry device; the rotatable lens barrel and the subjective optometry The device body serves as the astigmatism axis adjustment device and the astigmatism axis display device. When serving as the astigmatism axis adjustment device and the astigmatism axis display device, the two rotatable lens barrels can rotate synchronously. The lens barrel of the cylindrical lens A is connected to an astigmatism axis pointer, and the subjective optometry device body is connected to an astigmatism axis scale. When the rotatable lens barrel rotates, the astigmatism degree pointer and the astigmatism axis pointer on the astigmatism axis scale are driven to change their positions, so as to achieve the purpose of displaying and detecting the astigmatism axis by the subjective optometry device.

Images