Vision detection optical system and vision detection method

Abstract

The present invention relates to the field of vision detection technology, and discloses a vision detection optical system and vision detection method. The system includes: a detection subsystem, including an illumination device, a focusing module, and an acquisition device, wherein the illumination device is used to illuminate the target to be detected; a virtual sight mark subsystem, including a virtual sight mark device, a distance adjustment device, and a virtual image imaging device; wherein the distance adjustment device is used to adjust the distance between the virtual sight mark device and the virtual image imaging device, and the virtual image imaging device is used to reflect the light emitted by the virtual sight mark device to the focusing module; the virtual sight mark subsystem is used to generate a virtual sight mark at a preset distance; and a control subsystem is used to adjust the focusing module according to the light spot pattern acquired by the acquisition device until the acquisition device acquires a light spot pattern that meets the preset clarity. The present invention combines subjective and objective optometry, and can simulate the optical environment of natural viewing distance in a limited physical space, effectively improving inspection efficiency and accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of vision detection, and in particular to a vision detection optical system and a vision detection method. Background Art

[0002] As people's lifestyles and work styles continue to change, refractive errors such as myopia, hyperopia, and astigmatism are becoming increasingly common. Currently, vision testing plays a crucial role in clinical optometry and daily optometry services. Currently, vision testing relies primarily on two main methods: subjective refraction and objective refraction.

[0003] Among them, subjective refraction is one of the most commonly used optometry methods in clinical practice. Its basic principle is to test the subject's vision at a certain distance using an eye chart. This method requires the subject to judge and select the clearest image based on their own subjective visual experience to determine the refractive state. Although subjective refraction has the advantages of intuitive measurement and simple equipment, it has high site requirements, which limits its application. Objective refraction technology uses professional instruments combined with computer calculations to directly detect the refractive parameters of the eyeball. It does not rely on the subjective judgment of the subject and can provide a relatively fast and accurate indication of the eye's refractive state.

[0004] However, although objective optometry technology can reduce errors caused by subjective judgment, in the actual detection process, since the imaging distance inside the instrument and the display is usually short and fixed, it cannot fully simulate long-distance imaging. There are deficiencies in the "long-distance" visual field experience, which may cause the subject's adjustment reaction, thereby affecting the test results. Summary of the Invention

[0005] In view of this, the present invention provides a vision detection optical system and a vision detection method to solve the problem in the prior art that when performing refractive detection based on objective optometry technology, it is difficult to simulate long-range imaging like subjective optometry, thereby affecting the accuracy of refractive detection.

[0006] In a first aspect, the present invention provides a vision detection optical system, the system comprising:

[0007] The detection subsystem includes an illumination device, a focusing module, and an acquisition device. The illumination device is used to illuminate the target to be detected.

[0008] The virtual sight mark subsystem includes a virtual sight mark device, a distance adjustment device, and a virtual image forming device; wherein the distance adjustment device is used to adjust the distance between the virtual sight mark device and the virtual image forming device, and the virtual image forming device is used to reflect the light emitted by the virtual sight mark device to the focusing module; the virtual sight mark subsystem is used to generate a virtual image sight mark at a preset distance;

[0009] The control subsystem is used to adjust the focusing module according to the light spot pattern collected by the collection device until the collection device collects a light spot pattern that meets the preset clarity.

[0010] In an optional embodiment, the virtual image forming device includes:

[0011] The housing comprises a light entrance hole and a light exit hole;

[0012] A reflector is provided in the housing. The light emitted by the virtual sight mark device is transmitted to the reflector through the light entrance hole. The reflector is used to reflect the light emitted by the virtual sight mark device.

[0013] A semi-transparent and semi-reflective mirror is arranged in the housing, and is arranged parallel to the reflector and on the reflected light path of the reflector; the light forms multiple reflections in the reflector and the semi-transparent and semi-reflective mirror;

[0014] An aspheric reflector is arranged in the shell and is arranged on the reflected light path of the last reflection of the semi-transparent and semi-reflective mirror; the aspheric reflector is used to reflect the light reflected by the semi-transparent and semi-reflective mirror for the last time, and the reflected light is transmitted to the focusing module through the light exit hole.

[0015] In an optional embodiment, the virtual image forming apparatus further includes:

[0016] The magnifying lens is arranged on the path of the reflected light of the aspheric reflector.

[0017] In an optional embodiment, the collection device includes:

[0018] a first lens group, for transmitting light emitted by the illumination device;

[0019] The second lens group is arranged in the light-emitting direction of the first lens group to output parallel light;

[0020] a first beam splitter, disposed in the light-emitting direction of the second lens group and the focusing module, for combining the light emitted by the second lens group with the light transmitted by the focusing module;

[0021] A second beam splitter is provided in the light-emitting direction of the first beam splitter and is used to transmit the combined light to the target to be detected;

[0022] The reflected light sensor is used to collect the light reflected by the target to be detected to form a light spot pattern.

[0023] In an optional embodiment, the reflector is made of glass material;

[0024] The surface of the reflector is coated with a reflective film;

[0025] The length of the reflector is 60mm to 100mm;

[0026] The included angle between the reflector and the virtual sight mark device is 115°.

[0027] In an optional embodiment, the semi-transparent and semi-reflective mirror is made of glass material;

[0028] The semi-transparent and semi-reflective mirror adopts a multi-faceted and multi-reflective mode and a segmented coating method; the semi-transparent and semi-reflective mirror is divided into segment A and segment B on the same surface, wherein the surface of segment A is coated with a silver reflective film, and the surface of segment B is coated with a semi-transparent and semi-reflective film in the visible light band;

[0029] The length of the reflector is 70mm to 110mm;

[0030] The parallel distance between the semi-transparent mirror and the reflecting mirror is 33mm to 35mm.

[0031] In an optional embodiment, the aspheric reflector is an even-order aspheric reflector;

[0032] The curvature radius of the aspheric mirror is 330mm to 404mm;

[0033] The length of the aspheric mirror is 37mm to 39mm;

[0034] The included angle between the aspheric reflector and the reflector is 155°.

[0035] In an optional embodiment, the virtual sight mark device includes:

[0036] A display screen, used for displaying sight mark patterns;

[0037] The display uses silicon-based organic light-emitting diodes;

[0038] The display screen has a width of 16mm to 25mm and a height of 15mm to 20mm;

[0039] The display resolution is greater than or equal to 1920×1080 and less than or equal to 3840×2160.

[0040] In an optional embodiment, the distance between the display screen and the light incident hole is 9.5 mm to 18 mm.

[0041] In a second aspect, the present invention provides a method for detecting vision, the method comprising:

[0042] controlling the virtual sight mark device to display the sight mark pattern;

[0043] Controlling the distance adjustment device to adjust the distance between the virtual sight mark device and the virtual image forming device;

[0044] Acquire a light spot image collected by a collection device;

[0045] Based on the spot pattern, the focusing module is adjusted until the spot pattern acquired by the acquisition device meets the preset clarity, and the refractive data is output;

[0046] Obtaining the user's subjective visual mark recognition results;

[0047] Based on the subjective sight mark recognition results and refractive data, a comprehensive vision assessment report is output.

[0048] The present invention provides a vision detection optical system and method, which is a fusion optometry that combines subjective and objective refraction. By constructing an adjustable virtual sight mark subsystem within the ophthalmometer, an optical environment with a natural viewing distance of 2.5 meters to 5 meters can be simulated within a limited physical space, placing the subject's eyeball in a relaxed state similar to long-distance observation, thereby significantly reducing the interference of ciliary muscle adjustment tension on the optometry results, improving the detection accuracy of objective optometry and user experience. It can effectively solve the problem of adjustment error caused by close-range sight marks in related optometry technologies, as well as the problem of insufficient detection efficiency caused by the separation of subjective and objective optometry equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0050] Figure 1 is a schematic structural diagram of a vision detection optical system according to an embodiment of the present invention;

[0051] Figure 2 is a structural diagram of a virtual sight mark subsystem according to an embodiment of the present invention;

[0052] Figure 3 is another structural diagram of a virtual sight mark subsystem according to an embodiment of the present invention;

[0053] Figure 4 is a schematic diagram of a light path of a virtual image forming device according to an embodiment of the present invention;

[0054] Figure 5 is a schematic flow chart of a method for detecting vision according to an embodiment of the present invention;

[0055] Explanation of the accompanying drawings: 1-detection subsystem, 11-illumination device, 12-focusing module, 13-acquisition device, 14-pupil camera, 130-tenth lens group, 131-first lens group, 132-second lens group, 133-first beam splitter, 134-second beam splitter, 135-reflected light sensor, 136-third lens group, 137-third beam splitter, 138-fourth lens group, 139-fifth lens group, 2-virtual sight mark subsystem, 21-virtual sight mark device, 22-distance adjustment device, 23-virtual image imaging device, 231-housing, 2311-light entrance hole, 2312-light exit hole, 232-reflector, 233-semi-transparent and semi-reflective mirror, 234-aspherical reflector. DETAILED DESCRIPTION

[0056] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are 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 those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0057] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0058] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components; wireless connections or wired connections. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0059] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0060] In this embodiment, a vision detection optical system is provided, which can be used to detect the refractive state of the human eye. Figure 1 2 is a schematic structural diagram of a vision detection optical system according to an embodiment of the present invention, including a detection subsystem 1, a virtual sight mark subsystem 2, and a control subsystem (not shown in the figure), specifically as follows.

[0061] The detection subsystem 1 includes an illumination device 11, a focusing module 12, and a collection device 13. The illumination device 11 is used to illuminate the target to be detected. In this embodiment, the illumination device 11 may be an infrared light source. The infrared light source illuminates the target to be detected, i.e., the retina. The light reflected from the retina is detected by the collection device 13.

[0062] The virtual sight mark subsystem 2 includes a virtual sight mark device 21, a distance adjustment device 22 and a virtual image forming device 23; wherein the distance adjustment device 22 is used to adjust the distance between the virtual sight mark device 21 and the virtual image forming device 23, and the virtual image forming device 23 is used to reflect the light emitted by the virtual sight mark device 21 to the focusing module 12; the virtual sight mark subsystem 2 is used to generate a virtual image sight mark of a preset distance.

[0063] In traditional computerized optometry, the position and size of the sight mark have no direct bearing on refractive accuracy and are not directly involved in calculating the eye's diopter. Their primary purpose is to provide the examinee with a stable fixation target, keeping the eye in a relaxed position. Therefore, simple graphics, such as a blue sky or grassy landscape, are typically used, with a brightly colored target (a balloon, a house, etc.) centered in the image to facilitate focus. The sight mark is typically held approximately 50 cm from the retina, and this distance is not a particular concern. Therefore, the sight mark assembly in traditional ophthalmometers typically consists of a printed material with a colorful pattern and illumination sources positioned either above or below, or to the left or right.

[0064] This invention utilizes a virtual image sight mark subsystem, replacing traditional fixed sight marks, based on traditional computerized optometry. During the computerized optometry process, the examinee sees virtual sight marks at distances of 2.5 to 5 meters, generated by an aspheric reflector 234. These sight marks are dynamically generated by the Micro-OLED display and strictly follow the relevant eye chart generation rules, such as the GB / T11533-2011 "Standard Logarithmic Eye Chart," to ensure compliance with standard objective optometry testing requirements.

[0065] The generation and calculation of virtual image sight mark are as follows:

[0066] After reflection by the aspheric reflector 234 , the virtual image sight mark at 5 meters is approximately 21 inches (diagonal), and its size can be optimized by adjusting the curvature radius of the reflector 232 .

[0067] The resolution of the Micro-OLED in this embodiment is 1920×1080, and the physical size of the pixels of the corresponding virtual image target is approximately 0.243 mm / pixel.

[0068] The side length of the standard sight mark of 5.0 (1.0 visual acuity) at 5 meters should be 7.27mm, and the corresponding virtual image sight mark is about 30 pixels (7.27mm÷0.243mm / pixel).

[0069] For every line reduction (visual acuity value decreases by 0.1), the side length of the sight mark is reduced by 26% and converted into the corresponding number of pixels.

[0070] In this embodiment, an "E"-shaped sight mark (three horizontal lines of equal length and random opening directions) is used.

[0071] A 5.0 sight mark (1.0 visual acuity) corresponds to a 1′ visual angle. The formula for calculating the side length of the sight mark is:

[0072] Side length of sight mark = 5 × tan(1′) × detection distance = 7.27 mm (at 5 meters);

[0073] Each row of visual signs changes logarithmically to ensure compliance with the five-point recording method (5.0 to 4.0).

[0074] Automatically adjust the pixel size of the sight mark according to the detection distance (2.5 meters or 5 meters) to ensure consistent viewing angle.

[0075] While the examinee is undergoing objective computer refraction (automatic measurement of refraction), he or she only needs to identify the opening direction of the virtual image sight mark to simultaneously complete the subjective refraction (vision test), thereby improving the test efficiency.

[0076] The virtual image sight mark subsystem of the present invention comprises a virtual image forming device 23 and a virtual sight mark device 21. The virtual sight mark device 21 can employ a small-sized Micro-OLED display. The virtual sight mark device 21 is used to display a virtual image of a standard eye chart. The virtual image forming device 23 utilizes a multi-mirror set 232 and a free-form optical assembly. The distance between the virtual sight mark device 21 and the virtual image forming device 23 is adjusted by a distance adjustment device 22. This allows for flexible control of the distance simulated by the virtual sight mark, achieving virtual image projection equivalent to a long distance (2.5 to 5 meters).

[0077] The control subsystem is used to adjust the focusing module 12 according to the light spot pattern collected by the collection device 13 until the collection device 13 collects a light spot pattern that meets the preset clarity.

[0078] Light emitted by the illumination device 11 passes through a lens assembly, a beam splitter, and other structures before being focused onto the retina. It is then reflected by the retina and ultimately forms a light spot pattern on the CMOS camera of the reflected light sensor 135 in the acquisition device 13. While the reflected light sensor 135 continuously detects light, the control subsystem uses computer control to adjust the forward and backward position of the focusing module 12 until a clear light spot pattern is formed on the reflected light sensor 135. At this point, the current refractive power of the eye can be calculated by calculating the position of the focusing module 12, thus achieving objective optometry. During this process, the pupil of the eye and the reflected light sensor 135 of the computer optometry system must always maintain a conjugate relationship.

[0079] The present invention provides an optical system for vision testing, a fusion optometry system that combines subjective and objective refraction. By constructing an adjustable virtual sight mark subsystem 2 within the ophthalmometer, an optical environment with a natural viewing distance of 2.5 to 5 meters can be simulated within a limited physical space, placing the subject's eye in a relaxed state similar to that of long-distance observation. This significantly reduces the interference of ciliary muscle adjustment tension on the optometry results, improving the detection accuracy and user experience of objective refraction. This system can effectively address the problem of adjustment errors caused by close-range sight marks in related optometry technologies, as well as the problem of insufficient detection efficiency caused by the separation of subjective and objective refraction equipment.

[0080] In some optional embodiments, referring to Figure 2 and Figure 3 As shown, the virtual image forming device 23 includes:

[0081] The housing 231 includes a light entrance hole 2311 and a light exit hole 2312 .

[0082] The reflector 232 is disposed in the housing 231 . The light emitted by the virtual sight mark device 21 is transmitted to the reflector 232 through the light entrance hole 2311 . The reflector 232 is used to reflect the light emitted by the virtual sight mark device 21 .

[0083] The semi-transparent mirror 233 is disposed in the housing 231 . The semi-transparent mirror 233 is disposed parallel to the reflector 232 and is disposed on the reflected light path of the reflector 232 . The light is reflected multiple times in the reflector 232 and the semi-transparent mirror 233 .

[0084] The aspheric reflector 234 is arranged in the shell 231. The aspheric reflector 234 is arranged on the reflected light path of the last reflection of the semi-transparent and semi-reflective mirror 233; the aspheric reflector 234 is used to reflect the light reflected by the semi-transparent and semi-reflective mirror 233 for the last time, and the reflected light is transmitted to the focusing module 12 through the light outlet 2312.

[0085] The light path in this embodiment refers to Figure 4As shown, the light emitted by the virtual sight mark device 21 is transmitted to the reflector 232 through the light entrance hole 2311. The reflector 232 reflects the light emitted by the virtual sight mark device 21 to the semi-transparent and semi-reflective mirror 233. The light is reflected multiple times in the parallel reflector 232 and the semi-transparent and semi-reflective mirror 233 and then enters the aspheric reflector 234. Finally, the light is reflected by the aspheric reflector 234 and then emitted from the light exit hole 2312 to the focusing module 12.

[0086] Under the action of the distance adjustment device 22, the distance between the virtual sight mark device 21 and the virtual image imaging device 23 can be adjusted, and then the distance between the aspheric reflector 234 and the virtual sight mark device 21 can be adjusted. At this time, the virtual image sight mark distance will change within 2.5 meters to 5 meters as the distance between the virtual sight mark device 21 and the aspheric reflector 234 is adjusted.

[0087] The present invention utilizes multiple key links, such as the basic principles of optical imaging, the design of multiple groups of reflectors 232 and optical elements, optical path planning, and precise control of the virtual image position, to achieve multiple light reflections in a limited space and generate a controllable virtual image at a distance of 2.5 meters to 5 meters. In the present invention, the long-distance sight mark required for subjective optometry and computer optometry are integrated into the same device, which can achieve an effective fusion of subjective and objective optometry, and the fused device has the characteristics of precision, miniaturization, and intelligence. By flexibly controlling the distance simulated by the virtual image sight mark, the detection needs of patients with different refractive powers can be effectively adapted, and it is widely applicable to various application scenarios such as clinical optometry, vision screening, and telemedicine.

[0088] In some optional embodiments, the virtual image forming device 23 further includes:

[0089] The magnifying lens (not shown) is arranged on the reflected light path of the aspheric reflector 234. Specifically, it can be arranged on the light outlet.

[0090] In this embodiment, a magnifying lens is provided on the reflected light path of the aspheric reflector 234 to control the magnification of the virtual image sight mark, thereby achieving precise control of the size of the sight mark image.

[0091] In some optional embodiments, the collection device 13 includes:

[0092] The first lens group 131 is used to transmit the light emitted by the illumination device 11;

[0093] The second lens group 132 is arranged in the light emitting direction of the first lens group 131 to output parallel light;

[0094] A first beam splitter 133 is provided in the light emitting direction of the second lens group 132 and the focusing module 12, and is used to combine the light emitted by the second lens group 132 with the light transmitted by the focusing module 12;

[0095] The second beam splitter 134 is provided in the light-emitting direction of the first beam splitter 133 and is used to transmit the combined light to the target to be detected;

[0096] The reflected light sensor 135 is used to collect light reflected from the target to be detected to form a light spot pattern.

[0097] Reference Figure 1 The specific collection process is as follows:

[0098] Near-infrared light emitted by the illumination device 11 is converted into parallel light after passing through the first lens group 131 and the second lens group 132. After being reflected by the aspheric reflector 234, the light emitted from the light exit hole 2312 is combined with the parallel light at the first beam splitter 133 by the focusing module 12. The combined light is focused onto the retina of the human eye by the second beam splitter 134, the third lens group 136, the third beam splitter 137, and the fourth lens group 138. After being reflected by the retina, the light passes through the fourth lens group 138, the third beam splitter 137, the third lens group 136, the second beam splitter 134, and the fifth lens group 139, ultimately forming a light spot pattern on the CMOS camera of the reflected light sensor 135. While the reflected light sensor 135 continuously detects light, the control subsystem adjusts the front-to-back position of the focusing module 12 through computer control until a clear light spot pattern is formed on the reflected light sensor 135. At this point, the current refractive power of the human eye can be determined by calculating the position of the focusing module 12.

[0099] The acquisition device 13 also includes a pupil camera 14, which can be used to detect the size and position of the human pupil in real time, ensuring that the pupil center coincides with the optical axis. The pupil's reflected light passes through the fourth lens group 138, the third beam splitter 137, and the tenth lens group 130 before being imaged on the pupil camera 14, enabling real-time monitoring of the human pupil image.

[0100] In this embodiment, a virtual image generating device is used to replace the sight mark system in a traditional computer ophthalmometer, and subjective and objective ophthalmology are combined. This can effectively solve the adjustment error problem caused by close-range sight marks in related ophthalmology technologies, as well as the problem of insufficient detection efficiency caused by the separation of subjective and objective ophthalmology equipment, thereby effectively improving inspection efficiency and accuracy.

[0101] In some optional embodiments, the reflector 232 is made of glass material.

[0102] The surface of the reflector 232 is coated with a reflective film.

[0103] The length of the reflector 232 is 60 mm to 100 mm; specifically, it can be 65 mm, 70 mm, 75 mm, 80 mm, 85 mm, 90 mm, 95 mm, etc., which is not specifically limited here and can be selected according to actual needs.

[0104] The included angle between the reflector 232 and the virtual sight mark device 21 is 115°.

[0105] In this embodiment, the reflector 232 is made of high-purity K9 / BK7 glass material with a reflective film coated on the surface. The length is about 60 mm and it forms an angle of 115° with the Micro-OLE display screen.

[0106] In some optional embodiments, the semi-transparent and semi-reflective mirror 233 is made of glass material;

[0107] The semi-transparent and semi-reflective mirror 233 adopts a multi-faceted and multi-reflective mode and a segmented coating method; the semi-transparent and semi-reflective mirror 233 is divided into segment A and segment B on the same surface, wherein the surface of segment A is coated with a silver-plated reflective film, and the surface of segment B is coated with a semi-transparent and semi-reflective film in the visible light band.

[0108] The length of the reflector 232 is 70 mm to 110 mm, and can be 75 mm, 80 mm, 85 mm, 90 mm, 95 mm, 100 mm, 105 mm, etc., which is not specifically limited here and can be selected according to actual needs.

[0109] The parallel distance between the half mirror 233 and the reflecting mirror 232 is 33 mm to 35 mm.

[0110] The light is reflected by the reflector 232 onto the semi-transparent and semi-reflective mirror 233. In this embodiment, the semi-transparent and semi-reflective mirror 233 is made of high-purity K9 / BK7 glass material and adopts a multi-faceted and multi-reflective mode. The semi-transparent and semi-reflective mirror 233 adopts a segmented coating method and is divided into segment A and segment B on the same surface. Among them, segment A is 30 mm long and is coated with a silver-plated reflective film. The length of segment B is 41 mm and is coated with a semi-transparent and semi-reflective film in the visible light band. The semi-transparent and semi-reflective mirror 233 remains parallel to the reflector 232, and the parallel distance is 34 mm.

[0111] In some optional implementations, the aspheric reflector 234 is an even-order aspheric reflector 234 .

[0112] The curvature radius of the aspheric reflector 234 is 330 mm to 404 mm, and can be 340 mm, 353 mm, 340 mm, 350 mm, 360 mm, 370 mm, 380 mm, 390 mm, 400 mm, etc., which is not specifically limited here and can be selected according to actual needs.

[0113] The length of the aspherical mirror 234 is 37 mm to 39 mm.

[0114] The included angle between the aspheric reflector 234 and the reflector 232 is 155°.

[0115] After multiple reflections from parallel reflector 232 and semi-transparent mirror 233, the light enters aspheric reflector 234. In this embodiment, aspheric reflector 234 is a high-performance even-order aspheric reflector with a radius of curvature ranging from 353 mm to 404 mm. The magnification of the virtual image can be controlled by adjusting the radius of curvature and design parameters of aspheric reflector 234 or by adding a magnifying lens to light exit aperture 2312. Aspheric reflector 234 forms a 155° angle with reflector 232 and is approximately 38 mm long. This precision design ensures optimal light transmission.

[0116] In this embodiment, the reflector 232 includes fourth-, sixth-, and eighth-order terms, effectively compensating for optical distortion and amplifying the image on the Micro-OLED display. The unique shape of the even-order aspheric surface significantly reduces aberrations. In this embodiment, the distance between the aspheric reflector 234 and the Micro-OLED display is not fixed and can be adjusted within a range of 57 mm to 64 mm. The distance to the virtual image sight mark varies within a range of 2.5 to 5 meters as the distance between the Micro-OLED display and the aspheric reflector 234 is adjusted.

[0117] In some optional embodiments, the virtual sight mark device 21 includes:

[0118] A display screen, used for displaying sight mark patterns;

[0119] The display uses silicon-based organic light-emitting diodes;

[0120] The display screen has a width of 16mm to 25mm and a height of 15mm to 20mm;

[0121] The display resolution is greater than or equal to 1920×1080 and less than or equal to 3840×2160.

[0122] In some optional embodiments, the distance between the display screen and the light incident hole 2311 is 9.5 mm to 18 mm.

[0123] In the present invention, virtual sight marks replace traditional sight marks. The virtual sight mark device 21 displays the sight mark pattern on a small-sized Micro-OLED display. Micro-OLED is a microscopic organic light-emitting diode display technology based on a silicon substrate. It directly manufactures the light-emitting layer and driving circuit on the silicon wafer, enabling ultra-small pixel sizes (typically less than 10 microns) and ultra-high pixel densities (up to 3,000-5,000 PPI). Using a Micro-OLED display can meet the micro-high-resolution display requirements of the present invention. Micro-OLEDs are self-luminous, eliminating the need for a dedicated lighting source. Furthermore, the Micro-OLED screen has a communication interface, and the pattern displayed on the interface can be changed at any time via the ophthalmometer's control system.

[0124] The Micro-OLED display in this embodiment measures approximately 25mm x 20mm. It is connected to a distance adjustment device 22, which can be a stepper motor. The stepper motor can control the Micro-OLED display's forward and backward movement within a 10mm range. The Micro-OLED display's closest distance to the light entry hole 2311 is approximately 9.5mm, allowing the virtual image target to reach 5 meters. The Micro-OLED display can be moved to a maximum distance of 18mm from the light entry hole, allowing the virtual image target to reach 2.5 meters. Light from the Micro-OLED display enters the virtual image forming device 23 and strikes the reflector 232.

[0125] In some optional embodiments, the overall size of the virtual sight mark device 21 is less than or equal to 15 cm×20 cm×8 cm.

[0126] In this embodiment, a vision detection method is also provided, which can be executed by the vision detection optical system described in any of the above embodiments, or by a server, terminal, mobile terminal or other device. Figure 5 is a flow chart of a method for visual acuity detection according to an embodiment of the present invention. Figure 5 As shown, the process includes the following steps:

[0127] Step S101 , controlling the virtual optotype device 21 to display an optotype pattern.

[0128] Step S102 , controlling the distance adjustment device 22 to adjust the distance between the virtual sight mark device 21 and the virtual image forming device 23 .

[0129] Step S103 , obtaining the light spot pattern collected by the collection device 13 .

[0130] Step S104: Based on the spot pattern, the focusing module 12 is adjusted until the spot pattern acquired by the acquisition device 13 meets the preset clarity, and the refractive data is output.

[0131] Step S105: Obtain the user's subjective optotype recognition result.

[0132] Step S106: output a comprehensive vision assessment report based on the subjective sight mark recognition result and the refractive data.

[0133] The present invention dynamically displays optotypes on a Micro-OLED display screen, then uses a virtual image forming device to generate a virtual image of a standard eye chart at distances between 2.5 and 5 meters. This virtual image of the eye chart replaces the optotype function in traditional computer ophthalmometers, enabling computerized optometry (objective refraction). While undergoing objective refraction, the examinee can simultaneously identify the direction of the virtual optotype (subjective refraction). Finally, a comprehensive vision assessment report is generated based on the optotype recognition results and refractive data.

[0134] This invention combines subjective and objective refraction. By constructing an adjustable virtual sight mark subsystem within the ophthalmometer, it can simulate an optical environment with a natural viewing distance of 2.5 to 5 meters within a limited physical space. This allows the subject's eyeball to be in a relaxed state similar to that of long-distance observation, significantly reducing the interference of ciliary muscle adjustment tension on the refraction results, improving the detection accuracy and user experience of objective refraction. This effectively addresses the problem of accommodation error caused by close-range sight marks in related optometry technologies, as well as the insufficient detection efficiency caused by the separation of subjective and objective refraction equipment.

[0135] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention. Such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A vision detection optical system, characterized in that: The system comprises: A detection subsystem (1) comprises an illumination device (11), a focusing module (12), and a collection device (13), wherein the illumination device (11) is used to illuminate a target to be detected; A virtual sight mark subsystem (2) comprises a virtual sight mark device (21), a distance adjustment device (22) and a virtual image forming device (23); wherein the distance adjustment device (22) is used to adjust the distance between the virtual sight mark device (21) and the virtual image forming device (23); and the virtual image forming device (23) is used to reflect light emitted by the virtual sight mark device (21) to the focusing module (12); the virtual sight mark subsystem (2) is used to generate a virtual image sight mark of a preset distance; A control subsystem, configured to adjust the focusing module (12) according to the light spot pattern collected by the collection device (13), until the collection device (13) collects a light spot pattern that meets a preset clarity; The virtual image forming device (23) comprises: The housing (231) includes a light entrance hole (2311) and a light exit hole (2312); A reflector (232) is disposed in the housing (231), and the light emitted by the virtual sight mark device (21) is transmitted to the reflector (232) through the light entrance hole (2311). The reflector (232) is used to reflect the light emitted by the virtual sight mark device (21); A semi-transparent and semi-reflective mirror (233) is arranged in the housing (231), the semi-transparent and semi-reflective mirror (233) is arranged in parallel with the reflector (232), and is arranged on the reflected light path of the reflector (232); light forms multiple reflections in the reflector (232) and the semi-transparent and semi-reflective mirror (233); An aspheric reflector (234) is arranged in the housing (231), and the aspheric reflector (234) is arranged on the path of the reflected light of the last reflection of the semi-transparent and semi-reflective mirror (233); the aspheric reflector (234) is used to reflect the light of the last reflection of the semi-transparent and semi-reflective mirror (233), and the reflected light is transmitted to the focusing module (12) through the light exit hole (2312).

2. The system according to claim 1, wherein: The virtual image forming device (23) further includes: A magnifying lens is arranged on the reflected light path of the aspheric reflector (234).

3. The system according to claim 1, wherein: The collecting device (13) comprises: A first lens group (131) is used to transmit light emitted by the lighting device (11); A second lens group (132) is arranged in the light-emitting direction of the first lens group (131) to output parallel light; a first beam splitter (133), arranged in the light-emitting direction of the second lens group (132) and the focusing module (12), and used for combining the light emitted by the second lens group (132) with the light transmitted by the focusing module (12); a second beam splitter (134), arranged in the light-emitting direction of the first beam splitter (133), and used for transmitting the combined light to the target to be detected; The reflected light sensor (135) is used to collect the light reflected by the target to be detected to form the light spot diagram.

4. The system according to claim 1, wherein: The reflector (232) is made of glass material; The surface of the reflector (232) is coated with a reflective film; The length of the reflector (232) is 60 mm to 100 mm; The included angle between the reflector (232) and the virtual sight mark device (21) is 115°.

5. The system according to claim 1, wherein: The semi-transparent and semi-reflective mirror (233) is made of glass material; The semi-transparent and semi-reflective mirror (233) adopts a multi-faceted and multi-reflective mode and a segmented coating method; the semi-transparent and semi-reflective mirror (233) is divided into a segment A and a segment B on the same surface, wherein the surface of segment A is coated with a silver-plated reflective film, and the surface of segment B is coated with a semi-transparent and semi-reflective film in the visible light band; The length of the reflector (232) is 70 mm to 110 mm; The parallel distance between the semi-transparent and semi-reflective mirror (233) and the reflecting mirror (232) is 33 mm to 35 mm.

6. The system according to claim 1, wherein: The aspheric reflector (234) is an even-order aspheric reflector (234); The curvature radius of the aspheric reflector (234) is 330 mm to 404 mm; The length of the aspheric reflector (234) is 37 mm to 39 mm; The included angle between the aspheric reflector (234) and the reflector (232) is 155°.

7. The system according to claim 1, wherein: The virtual sight mark device (21) comprises: A display screen, used for displaying sight mark patterns; The display screen adopts silicon-based organic light-emitting diodes; The display screen has a width of 16 mm to 25 mm and a height of 15 mm to 20 mm; The resolution of the display screen is greater than or equal to 1920×1080 and less than or equal to 3840×2160.

8. The system according to claim 7, characterized in that The distance between the display screen and the light entrance hole (2311) is 9.5 mm to 18 mm.

9. A method for visual acuity detection, characterized in that: The vision detection optical system according to any one of claims 1 to 8, wherein the method comprises: controlling the virtual sight mark device (21) to display a sight mark pattern; Controlling the distance adjustment device (22) to adjust the distance between the virtual sight mark device (21) and the virtual image forming device (23); Obtaining a light spot image collected by a collection device (13); Based on the light spot diagram, adjusting the focusing module (12) until the light spot diagram collected by the collection device (13) meets a preset clarity, and outputting refractive data; Obtaining the user's subjective visual mark recognition results; Based on the subjective sight mark recognition result and the refractive data, a comprehensive vision assessment report is output.

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