Vision detection optical system and vision detection method

Abstract

The invention relates to the technical field of vision detection, and discloses a vision detection optical system and a vision detection method.The system comprises a detection subsystem which comprises a lighting device, a focusing module and a collecting device, and the lighting device is used for lighting a to-be-detected target; the virtual sighting mark subsystem comprises a virtual sighting mark device, a distance adjusting device and a virtual image imaging device; wherein the distance adjusting device is used for adjusting the distance between the virtual sighting mark device and the virtual image imaging device, and the virtual image imaging device is used for reflecting light rays emitted by the virtual sighting mark device to the focusing module; the virtual sighting mark subsystem is used for generating a virtual image sighting mark with a preset distance; and the control subsystem is used for adjusting the focusing module according to the light spot pattern acquired by the acquisition device until the acquisition device acquires the light spot pattern meeting the preset definition. According to the invention, subjective optometry and objective optometry are combined, an optical environment of a natural sight distance can be simulated in a limited physical space, and the inspection efficiency and accuracy are effectively improved.

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] With the continuous changes in people's living and working styles, refractive errors such as myopia, hyperopia, and astigmatism have become increasingly common. At present, vision detection plays a very important role in clinical optometry and daily optometry services. Currently, vision examinations mainly rely on two major types of detection methods, namely subjective optometry and objective optometry.

[0003] Among them, the subjective optometry method is one of the most commonly used optometry means in clinical practice. Its basic principle is to enable the person being tested to conduct a vision test at a certain distance through a vision chart. This method requires the person being tested to judge and select the clearest image based on their own visual subjective feelings, so as to determine the refractive state. Although subjective optometry has the advantages of intuitive measurement and simple equipment, subjective optometry has high requirements for the venue, which limits its application. Objective optometry technology directly detects the refractive parameters of the eyeball through professional instruments combined with computer calculations, without relying on the subjective judgment of the person being tested, and can relatively quickly and accurately give the refractive state of the eye.

[0004] However, although objective optometry technology can reduce the errors caused by subjective judgment, in the actual detection process, due to the usually short and fixed imaging distance inside the instrument and the display, it is impossible to fully simulate the long-distance imaging, and there is a deficiency in the "long-distance" visual field experience, which may cause the accommodation reaction of the person being tested, thus affecting the detection result. 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 the long-distance imaging like subjective optometry, thus affecting the accuracy of refractive detection.

[0006] In a first aspect, the present invention provides a vision detection optical system, which includes: A detection subsystem, including an illumination device, a focusing module, and an acquisition device, where the illumination device is used to illuminate the target to be detected; A virtual visual target subsystem, including a virtual visual target 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 visual target device and the virtual image imaging device, and the virtual image imaging device is used to reflect the light emitted by the virtual visual target device to the focusing module; the virtual visual target subsystem is used to generate a virtual visual target at a preset distance; A control subsystem for adjusting a focusing module according to a spot pattern collected by a collection device until the collection device collects a spot pattern that meets a preset clarity.

[0007] In an optional implementation, a virtual image imaging device includes: A housing including a light input hole and a light output hole; A reflecting mirror disposed inside the housing, light rays emitted by a virtual reticle device are transmitted through the light input hole to the reflecting mirror, and the reflecting mirror is used for reflecting the light rays emitted by the virtual reticle device; A semi-transmissive semi-reflective mirror disposed inside the housing, the semi-transmissive semi-reflective mirror is arranged in parallel with the reflecting mirror and is disposed on the reflection light path of the reflecting mirror; multiple reflections are formed by the light rays in the reflecting mirror and the semi-transmissive semi-reflective mirror; An aspherical reflecting mirror disposed inside the housing, the aspherical reflecting mirror is disposed on the reflection light path of the last reflection of the semi-transmissive semi-reflective mirror; the aspherical reflecting mirror is used for reflecting the light rays of the last reflection of the semi-transmissive semi-reflective mirror, and the reflected light rays are transmitted through the light output hole to the focusing module.

[0008] In an optional implementation, the virtual image imaging device further includes: An amplifying lens disposed on the reflection light path of the aspherical reflecting mirror.

[0009] In an optional implementation, the collection device includes: A first lens group for transmitting the light rays emitted by an illumination device; A second lens group disposed in the light output direction of the first lens group to output parallel light rays; A first beam splitter disposed in the light output direction of the second lens group and the focusing module, for combining the light rays emitted by the second lens group and the light rays transmitted by the focusing module; A second beam splitter disposed in the light output direction of the first beam splitter, for transmitting the combined light rays to a target to be detected; A reflected light sensor for collecting the light reflected by the target to be detected to form a spot pattern.

[0010] In an optional implementation, the reflecting mirror is made of a glass material; The surface of the reflecting mirror is coated with a reflective film; The length of the reflecting mirror is 60 mm to 100 mm; The included angle between the reflecting mirror and the virtual reticle device is 115°.

[0011] In an optional implementation, the semi-transmissive semi-reflective mirror is made of a glass material; The semi-transmissive and semi-reflective mirror adopts a multi-faceted and multi-reflection mode and a segmented coating method; the semi-transmissive and semi-reflective mirror is divided into section A and section B on the same surface. Among them, a silver-coated reflective film is deposited on the surface of section A, and a visible light band semi-transmissive and semi-reflective film is deposited on the surface of section B; The length of the reflector is 70 mm to 110 mm; The parallel distance between the semi-transmissive and semi-reflective mirror and the reflector is 33 mm to 35 mm.

[0012] In an optional embodiment, the aspherical reflector is an even aspherical reflector; The radius of curvature of the aspherical reflector is 330 mm to 404 mm; The length of the aspherical reflector is 37 mm to 39 mm; The included angle between the aspherical reflector and the reflector is 155°.

[0013] In an optional embodiment, the virtual target device includes: A display screen for displaying a target pattern; The display screen adopts silicon-based organic light-emitting diodes; The width of the display screen is 16 mm to 25 mm, and the height is 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.

[0014] In an optional embodiment, the distance between the display screen and the light incident hole is 9.5 mm to 18 mm.

[0015] In a second aspect, the present invention provides a vision detection method, which includes: Controlling the virtual target device to display a target pattern; Controlling the distance adjustment device to adjust the distance between the virtual target device and the virtual image imaging device; Obtaining the spot pattern collected by the collection device; Based on the spot pattern, adjusting the focusing module until the spot pattern collected by the collection device meets the preset clarity, and outputting refractive data; Obtaining the user's subjective target recognition result; Based on the subjective target recognition result and the refractive data, outputting a comprehensive vision assessment report.

[0016] The present invention provides a vision detection optical system and a vision detection method, which is a fusion optometry that combines subjective and objective optometry. By constructing an adjustable virtual target subsystem inside the optometer, an optical environment with a natural viewing distance of 2.5 meters to 5 meters can be simulated within a limited physical space, enabling the eyeballs of the examinees to be in a relaxed state similar to observing at a long distance, thereby significantly reducing the interference of ciliary muscle accommodation tension on the optometry result and improving the detection accuracy and user experience of objective optometry. It can effectively solve the accommodation error problem caused by near-distance targets in related optometry technologies and the problem of insufficient detection efficiency caused by the separation of subjective and objective optometry devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 is a schematic structural diagram of a vision detection optical system according to an embodiment of the present invention; Figure 2 is a schematic structural diagram of a virtual target subsystem according to an embodiment of the present invention; Figure 3 is another schematic structural diagram of a virtual target subsystem according to an embodiment of the present invention; Figure 4 is a schematic optical path diagram of a virtual image forming device according to an embodiment of the present invention; Figure 5 is a schematic flow diagram of a vision detection optical method according to an embodiment of the present invention; Description of the reference numerals: 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 target subsystem, 21 - virtual target device, 22 - distance adjustment device, 23 - virtual image forming device, 231 - housing, 2311 - light incident hole, 2312 - light exit hole, 232 - mirror, 233 - semi-transparent semi-reflective mirror, 234 - aspherical mirror. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts fall within the protection scope of the present invention.

[0020] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0021] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and can also be the communication inside two elements. It can be a wireless connection or a wired connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0023] 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 It is a schematic structural diagram of the vision detection optical system according to the embodiment of the present invention, including a detection subsystem 1, a virtual visual target subsystem 2, and a control subsystem (not shown in the figure), specifically as follows.

[0024] 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. The illumination device 11 used in this embodiment can be an infrared illumination light source. By using the infrared illumination light source to illuminate the target to be detected, that is, the eye retina, the light reflected from the retina will be detected by the collection device 13.

[0025] The virtual target subsystem 2 includes a virtual target device 21, a distance adjustment device 22, and a virtual image imaging device 23. Among them, the distance adjustment device 22 is used to adjust the distance between the virtual target device 21 and the virtual image imaging device 23, and the virtual image imaging device 23 is used to reflect the light emitted by the virtual target device 21 to the focusing module 12. The virtual target subsystem 2 is used to generate a virtual target at a preset distance.

[0026] In traditional computer optometry technology, the position and size of the target have no direct relation to the accuracy of optometry and do not directly participate in the calculation of the refractive power of the human eye. It mainly provides a stable fixation target for the examinee to keep the eyeball in a relaxed state as much as possible. Therefore, simple graphics are generally used, such as blue sky or grassland patterns, with brightly colored targets (such as balloons, houses, etc.) in the center of the screen to facilitate eye fixation. The target is generally about 50 cm away from the human eye retina, and the distance of the target is not specifically concerned. Therefore, the target device in traditional optometers generally consists of printed matter with colored patterns and illumination sources placed vertically or horizontally.

[0027] Based on traditional computer optometry, the present invention uses a virtual target subsystem to replace the traditional fixed target. During computer optometry, the examinee sees virtual targets at a distance of 2.5 m to 5 m formed by the aspherical mirror 234. These targets are dynamically generated by the Micro-OLED display screen and are strictly generated in accordance with relevant visual acuity chart generation rules, such as GB / T 11533-2011 Standard Logarithmic Visual Acuity Chart, to ensure compliance with the requirements of standard objective optometry detection.

[0028] The generation and calculation of the virtual target are as follows: After being reflected by the aspherical mirror 234, the virtual target at 5 m is about 21 inches (diagonal), and its size can be optimized by adjusting the radius of curvature of the mirror 232.

[0029] The Micro-OLED in this embodiment has a resolution of 1920×1080, and the physical pixel size of the corresponding virtual target is about 0.243 mm / pixel.

[0030] The standard side length of the 5.0 target (visual acuity of 1.0) at 5 m should be 7.27 mm, and the corresponding virtual target is about 30 pixels (7.27 mm÷0.243 mm / pixel).

[0031] For each row reduction (visual acuity value decreases by 0.1), the side length of the target is reduced by 26% and converted into the corresponding number of pixels.

[0032] In this embodiment, the "E"-shaped target (three horizontal lines of equal length, random opening direction) is adopted.

[0033] The 5.0 visual acuity chart (1.0 eyesight) corresponds to a 1′ visual angle. The calculation formula for the side length of the visual acuity chart is: Side length of the visual acuity chart = 5 × tan(1′) × detection distance = 7.27 mm (at 5 meters); Each row of the visual acuity chart changes in a logarithmic gradient to ensure compliance with the five-point recording method (from 5.0 to 4.0).

[0034] According to the detection distance (2.5 meters or 5 meters), the pixel size of the virtual visual acuity chart is automatically adjusted to ensure a consistent visual angle.

[0035] While the subject is undergoing objective computer optometry (automatic refractometry), they only need to identify the opening direction of the virtual visual acuity chart to simultaneously complete subjective optometry (visual acuity detection), improving the detection efficiency.

[0036] The virtual visual acuity chart subsystem of the present invention consists of a virtual image imaging device 23 and a virtual visual acuity chart device 21. The virtual visual acuity chart device 21 can be a small-sized Micro-Oled display screen. Among them, the virtual visual acuity chart device 21 is used to display the virtual image of the standard visual acuity chart, and the virtual image imaging device 23 uses a multi-mirror 232 group and a free-form optical component. By adjusting the distance between the virtual visual acuity chart device 21 and the virtual image imaging device 23 through the distance adjustment device 22, the distance simulated by the virtual visual acuity chart can be flexibly controlled to achieve a virtual image projection equivalent to a long distance (from 2.5 meters to 5 meters).

[0037] The control subsystem is used to adjust the focusing module 12 according to the spot pattern collected by the acquisition device 13 until the acquisition device 13 collects a spot pattern that meets the preset clarity.

[0038] The light emitted by the lighting device 11 passes through structures such as a lens group and a beam splitter and is focused on the human eye retina. Then, after being reflected by the retina, it finally forms a spot pattern on the CMOS camera of the reflected light sensor 135 in the acquisition device 13. During the continuous detection of the reflected light sensor 135, the control subsystem controls and adjusts the front and back positions of the focusing module 12 through a computer until a clear spot pattern is formed on the reflected light sensor 135. At this time, the refractive power of the current human eye can be obtained by calculating the position where the focusing module 12 moves, that is, objective optometry is achieved. During this process, the human eye pupil and the reflected light sensor 135 of the computer optometry system must always maintain a conjugate relationship.

[0039] The present invention provides a vision detection optical system, which is a fusion optometry that combines subjective and objective optometry. By constructing an adjustable virtual target subsystem 2 inside the optometer, an optical environment with a natural viewing distance of 2.5 meters to 5 meters can be simulated within a limited physical space, enabling the eyes of the examinee to be in a relaxed state similar to observing at a long distance, thereby significantly reducing the interference of ciliary muscle accommodation tension on the optometry result and improving the detection accuracy and user experience of objective optometry. It can effectively solve the accommodation error problem caused by near targets in related optometry technologies and the problem of insufficient detection efficiency caused by the separation of subjective and objective optometry devices.

[0040] In some alternative embodiments, referring to Figure 2 and Figure 3 as shown, the virtual image forming device 23 includes: A housing 231, including a light incident hole 2311 and a light exit hole 2312.

[0041] A reflecting mirror 232, disposed inside the housing 231. The light emitted by the virtual target device 21 is transmitted to the reflecting mirror 232 through the light incident hole 2311, and the reflecting mirror 232 is used to reflect the light emitted by the virtual target device 21.

[0042] A semi-transmissive and semi-reflective mirror 233, disposed inside the housing 231. The semi-transmissive and semi-reflective mirror 233 is arranged in parallel with the reflecting mirror 232 and is disposed on the reflection light path of the reflecting mirror 232; the light forms multiple reflections in the reflecting mirror 232 and the semi-transmissive and semi-reflective mirror 233.

[0043] An aspherical reflecting mirror 234, disposed inside the housing 231. The aspherical reflecting mirror 234 is disposed on the reflection light path of the last reflection of the semi-transmissive and semi-reflective mirror 233; the aspherical reflecting mirror 234 is used to reflect the light of the last reflection of the semi-transmissive and semi-reflective mirror 233, and the reflected light is transmitted to the focusing module 12 through the light exit hole 2312.

[0044] The light path in this embodiment refers to Figure 4 as shown. The light emitted by the virtual target device 21 is transmitted to the reflecting mirror 232 through the light incident hole 2311. The reflecting mirror 232 reflects the light emitted by the virtual target device 21 to the semi-transmissive and semi-reflective mirror 233. The light forms multiple reflections in the parallel reflecting mirror 232 and semi-transmissive and semi-reflective mirror 233 and then enters the aspherical reflecting mirror 234. Finally, the light is reflected by the aspherical reflecting mirror 234 and exits from the light exit hole 2312 to the focusing module 12.

[0045] Under the action of the distance adjustment device 22, the distance between the virtual vision target device 21 and the virtual image imaging device 23 can be adjusted. Furthermore, the distance between the aspherical mirror 234 and the virtual vision target device 21 can be adjusted. At this time, the virtual image vision target distance will vary between 2.5 meters and 5 meters as the distance between the virtual vision target device 21 and the aspherical mirror 234 is adjusted.

[0046] The present invention utilizes multiple key aspects such as the basic principle of optical imaging, the design of multiple groups of mirrors 232 and optical elements, optical path planning, and precise control of the virtual image position, etc., to achieve multiple light reflections within a limited space and generate a controllable virtual image at a distance between 2.5 meters and 5 meters. In the present invention, the long-distance vision target required for subjective optometry and computer optometry are integrated into the same device, which can effectively integrate subjective and objective optometry. Moreover, the integrated device has characteristics such as precision, miniaturization, and intelligence. By flexibly controlling the distance simulated by the virtual image vision target, the detection requirements 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.

[0047] In some alternative embodiments, the virtual image imaging device 23 further includes: A magnifying lens (not shown in the figure), which is arranged on the reflection light path of the aspherical mirror 234. Specifically, it can be arranged at the light exit.

[0048] In this embodiment, arranging a magnifying lens on the reflection light path of the aspherical mirror 234 can control the magnification of the virtual image vision target and achieve precise control of the imaging size of the vision target.

[0049] In some alternative embodiments, the acquisition device 13 includes: A first lens group 131, which is used to transmit the light emitted by the illumination device 11; A second lens group 132, which is arranged in the light exit direction of the first lens group 131 to output parallel light; A first beam splitter 133, which is arranged in the light exit 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 and the light transmitted by the focusing module 12; A second beam splitter 134, which is arranged in the light exit direction of the first beam splitter 133 and is used to transmit the combined light to the target to be detected; A reflected light sensor 135, which is used to collect the light reflected by the target to be detected to form a spot pattern.

[0050] Refer to Figure 1 As shown, the specific acquisition process is as follows: The near-infrared light emitted by the lighting device 11 forms parallel light after passing through the first lens group 131 and the second lens group 132. The light emitted from the light exit hole 2312 after being reflected by the aspherical mirror 234 is combined with the parallel light at the first beam splitter 133 through the focusing module 12. The combined light is focused on the human eye retina through the second beam splitter 134, the third lens group 136, the third beam splitter 137, and the fourth lens group 138. Then, after being reflected by the retina, it 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, and finally forms a spot pattern on the CMOS camera of the reflected light sensor 135. During the continuous detection of the reflected light sensor 135, the control subsystem controls and adjusts the front-back position of the focusing module 12 through a computer until a clear spot pattern is formed on the reflected light sensor 135. At this time, the diopter of the current human eye can be obtained by calculating the moving position of the focusing module 12.

[0051] The acquisition device 13 further includes a pupil camera 14, which can be used to detect the size and position of the human eye pupil in real time to ensure that the pupil center coincides with the optical axis. The reflected light of the pupil passes through the fourth lens group 138, the third beam splitter 137, and the tenth lens group 130, and then is imaged on the pupil camera 14 to realize the real-time monitoring of the human eye pupil image.

[0052] In this embodiment, a virtual image generating device is used to replace the target system in the traditional computer optometry instrument, combining subjective and objective optometry, which can effectively solve the accommodation error problem caused by near targets in related optometry technologies and the problem of insufficient detection efficiency caused by the separation of subjective and objective optometry devices, and effectively improve the inspection efficiency and accuracy.

[0053] In some alternative embodiments, the mirror 232 is made of glass material.

[0054] The surface of the mirror 232 is coated with a reflective film.

[0055] The length of the mirror 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. No specific limitation is made here, and it can be selected according to actual needs.

[0056] The included angle between the mirror 232 and the virtual target device 21 is 115°.

[0057] In this embodiment, the mirror 232 is made of high-purity K9 / BK7 glass material, the surface is coated with a reflective film, the length is about 60 mm, and the included angle with the Micro-OLED display screen is 115°.

[0058] In some alternative embodiments, the semi-transmissive semi-reflective mirror 233 is made of glass material; The semi-transmissive and semi-reflective mirror 233 adopts a multi-faceted and multi-reflection mode and a segmented coating method; the semi-transmissive and semi-reflective mirror 233 is divided into section A and section B on the same surface. Among them, a silver-coated reflective film is deposited on the surface of section A, and a visible light band semi-transmissive and semi-reflective film is deposited on the surface of section B.

[0059] The length of the mirror 232 is from 70 mm to 110 mm. Specifically, it can be 75 mm, 80 mm, 85 mm, 90 mm, 95 mm, 100 mm, 105 mm, etc. No specific limitation is made here, and it can be selected according to actual needs.

[0060] The parallel distance between the semi-transmissive and semi-reflective mirror 233 and the mirror 232 is from 33 mm to 35 mm.

[0061] The light is reflected by the mirror 232 onto the semi-transmissive and semi-reflective mirror 233. In this embodiment, the semi-transmissive and semi-reflective mirror 233 is made of high-purity K9 / BK7 glass material, adopts a multi-faceted and multi-reflection mode, and the semi-transmissive and semi-reflective mirror 233 adopts a segmented coating method. It is divided into section A and section B on the same surface. Among them, section A has a length of 30 mm and is coated with a silver-coated reflective film, section B has a length of 41 mm and is coated with a visible light band semi-transmissive and semi-reflective film. The semi-transmissive and semi-reflective mirror 233 is parallel to the mirror 232, and the parallel distance is 34 mm.

[0062] In some alternative embodiments, the aspherical mirror 234 is an even aspherical mirror 234.

[0063] The radius of curvature of the aspherical mirror 234 is from 330 mm to 404 mm. Specifically, it can be 340 mm, 353 mm, 340 mm, 350 mm, 360 mm, 370 mm, 380 mm, 390 mm, 400 mm, etc. No specific limitation is made here, and it can be selected according to actual needs.

[0064] The length of the aspherical mirror 234 is from 37 mm to 39 mm.

[0065] The included angle between the aspherical mirror 234 and the mirror 232 is 155°.

[0066] The light forms multiple reflections in the parallel mirrors 232 and semi-transmissive and semi-reflective mirror 233 and then enters the aspherical mirror 234. The aspherical mirror 234 in this embodiment is a high-performance even aspherical mirror 234, and its radius of curvature is from 353 mm to 404 mm. By adjusting the radius of curvature of the aspherical mirror 234 and the design parameters of the aspherical mirror 234 or adding a magnifying lens at the light exit hole 2312, the virtual image magnification can be controlled. The included angle between the aspherical mirror 234 and the mirror 232 is 155°, and the length is about 38 mm. After precise design, it is ensured that the light reaches the best effect.

[0067] In this embodiment, the mirror 232 includes fourth-order, sixth-order, and eighth-order terms, which can effectively compensate for optical distortion, magnify the image of the Micro-OLED display screen, and the special shape of the even aspherical surface greatly reduces aberration. In this embodiment, the distance between the aspherical mirror 234 and the Micro-OLED display screen is not fixed and can be adjusted within the range of 57 mm to 64 mm. The distance of the virtual image target will change within the range of 2.5 meters to 5 meters as the distance between the Micro-OLED display screen and the aspherical mirror 234 is adjusted.

[0068] In some alternative embodiments, the virtual target device 21 includes: A display screen for displaying a target pattern; The display screen uses silicon-based organic light-emitting diodes; The width of the display screen is 16 mm to 25 mm, and the height is 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.

[0069] In some alternative embodiments, the distance between the display screen and the light incident hole 2311 is 9.5 mm to 18 mm.

[0070] In the present invention, the virtual image target replaces the traditional target. The virtual target device 21 displays the target pattern with a small-sized Micro-OLED display screen. Micro-OLED is a micro organic light-emitting diode display technology based on a silicon substrate. It directly fabricates the light-emitting layer and driving circuit on a silicon wafer, which can achieve an ultra-small pixel size, usually less than 10 microns, and an ultra-high pixel density (up to 3000 - 5000 PPI). Using a Micro-OLED display screen can meet the requirements of micro high-resolution display in the present invention. Micro-OLED can emit light by itself, so there is no need to configure a dedicated illumination light source. And the Micro-OLED screen has a communication interface, and the pattern displayed on the interface can be changed at any time through the control system of the optometer.

[0071] The size of the Micro-OLED display screen in this embodiment is approximately 25 mm×20 MM. The Micro-OLED display screen is connected to the distance adjustment device 22, and the distance adjustment device 22 can be a stepper motor. The stepper motor can control the Micro-OLED display screen to move back and forth within a range of 10 mm. The closest distance between the Micro-OLED display screen and the light incident hole 2311 is approximately 9.5 mm, and at this time, the virtual image target can reach 5 meters; the farthest distance that the Micro-OLED display screen can move is 18 mm away from the light incident hole, and at this time, the virtual image target is 2.5 meters. The light of the MicroOLED display screen enters the virtual image imaging device 23 and irradiates the mirror 232.

[0072] In some alternative embodiments, the overall size of the virtual target device 21 is less than or equal to 15 cm × 20 cm × 8 cm.

[0073] 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 devices such as a server, a terminal, a mobile terminal, etc. Figure 5 It is a flowchart of the vision detection method according to an embodiment of the present invention, as Figure 5 shown, and this process includes the following steps: Step S101, control the virtual target device 21 to display a target pattern.

[0074] Step S102, control the distance adjustment device 22 to adjust the distance between the virtual target device 21 and the virtual image forming device 23.

[0075] Step S103, obtain the spot pattern collected by the collection device 13.

[0076] Step S104, based on the spot pattern, adjust the focusing module 12 until the spot pattern collected by the collection device 13 meets the preset clarity, and output refractive data.

[0077] Step S105, obtain the subjective target recognition result of the user.

[0078] Step S106, based on the subjective target recognition result and the refractive data, output a comprehensive vision assessment report.

[0079] The present invention can dynamically display a target through a Micro-OLED display screen, and then generate a virtual image of a standard eye chart at a distance of 2.5 meters to 5 meters through the virtual image forming device. The virtual image of the eye chart replaces the target function in a traditional computer optometer to achieve the computer optometry (objective optometry) function; when the subject undergoes objective optometry, the subject can simultaneously identify the direction of the virtual target (subjective optometry); finally, according to the target recognition result and the refractive data, a comprehensive vision assessment report is output.

[0080] The present invention combines subjective and objective optometry. By constructing an adjustable virtual target subsystem inside the optometer, an optical environment with a natural viewing distance of 2.5 meters to 5 meters can be simulated within a limited physical space, enabling the subject's eyeball to be in a relaxed state similar to observing at a long distance, thereby significantly reducing the interference of ciliary muscle accommodation tension on the optometry result and improving the detection accuracy and user experience of objective optometry. It can effectively solve the problem of accommodation error caused by close-range targets in related optometry technologies, as well as the problem of insufficient detection efficiency caused by the separation of subjective and objective optometry devices.

[0081] While embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations fall within the scope defined by the appended claims.

Claims

1. An optical system for vision detection, characterized in that, The system includes: A detection subsystem (1), including an illumination device (11), a focusing module (12), and a collection device (13), where the illumination device (11) is used to illuminate the target to be detected; A virtual reticle subsystem (2), including a virtual reticle device (21), a distance adjustment device (22), and a virtual image imaging device (23); wherein, the distance adjustment device (22) is used to adjust the distance between the virtual reticle device (21) and the virtual image imaging device (23), and the virtual image imaging device (23) is used to reflect the light emitted by the virtual reticle device (21) to the focusing module (12); the virtual reticle subsystem (2) is used to generate a virtual reticle at a preset distance; A control subsystem, configured to adjust the focusing module (12) according to the spot pattern collected by the collection device (13) until the collection device (13) collects a spot pattern that meets the preset clarity.

2. The system according to claim 1, wherein, The virtual image imaging device (23) includes: A housing (231), including a light incident hole (2311) and a light exit hole (2312); A reflecting mirror (232), disposed inside the housing (231), and the light emitted by the virtual reticle device (21) is transmitted to the reflecting mirror (232) through the light incident hole (2311), and the reflecting mirror (232) is used to reflect the light emitted by the virtual reticle device (21); A semi-transmissive semi-reflective mirror (233), disposed inside the housing (231), the semi-transmissive semi-reflective mirror (233) is arranged in parallel with the reflecting mirror (232) and is disposed on the reflection light path of the reflecting mirror (232); the light forms multiple reflections between the reflecting mirror (232) and the semi-transmissive semi-reflective mirror (233); An aspherical reflecting mirror (234), disposed inside the housing (231), the aspherical reflecting mirror (234) is disposed on the reflection light path of the last reflection of the semi-transmissive semi-reflective mirror (233); the aspherical reflecting mirror (234) is used to reflect the light of the last reflection of the semi-transmissive semi-reflective mirror (233), and the reflected light is transmitted to the focusing module (12) through the light exit hole (2312).

3. The system according to claim 2, wherein The virtual image imaging device (23) further includes: An amplifying lens, disposed on the reflection light path of the aspherical reflecting mirror (234).

4. The system according to claim 2, wherein The collection device (13) includes: A first lens group (131), used to transmit the light emitted by the illumination device (11); A second lens group (132), disposed in the light exit direction of the first lens group (131) to output parallel light; A first beam splitter (133), disposed in the light exit directions of the second lens group (132) and the focusing module (12), and used to combine the light emitted by the second lens group (132) and the light transmitted by the focusing module (12); A second beam splitter (134), disposed in the light exit direction of the first beam splitter (133), and used to transmit the combined light to the target to be detected; A reflected light sensor (135) for collecting the light reflected by the target to be detected to form the spot pattern.

5. The system according to claim 2, characterized in that, The mirror (232) is made of glass material; The surface of the mirror (232) is coated with a reflective film; The length of the mirror (232) is 60 mm to 100 mm; The angle between the mirror (232) and the virtual target device (21) is 115°; 6. The system according to claim 2, wherein The semi-transmissive semi-reflective mirror (233) is made of glass material; The semi-transmissive semi-reflective mirror (233) adopts a multi-faceted multi-reflection mode and a segmented coating method; the semi-transmissive semi-reflective mirror (233) is divided into section A and section B on the same surface, where the surface of section A is coated with a silver-coated reflective film, and the surface of section B is coated with a visible light band semi-transmissive semi-reflective film; The length of the mirror (232) is 70 mm to 110 mm; The parallel distance between the semi-transmissive semi-reflective mirror (233) and the mirror (232) is 33 mm to 35 mm; 7. The system according to claim 2, wherein The aspherical mirror (234) is an even aspherical mirror (234); The radius of curvature of the aspherical mirror (234) is 330 mm to 404 mm; The length of the aspherical mirror (234) is 37 mm to 39 mm; The angle between the aspherical mirror (234) and the mirror (232) is 155°; 8. The system according to claim 2, wherein The virtual target device (21) includes: A display screen for displaying a target pattern; The display screen uses silicon-based organic light-emitting diodes; The width of the display screen is 16 mm to 25 mm, and the height is 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; 9. The system according to claim 8, wherein The distance between the display screen and the light incident hole (2311) is 9.5 mm to 18 mm; 10. A vision detection method, characterized in that, Applicable to the vision detection optical system according to any one of the above claims 1-9, the method includes: Controlling the virtual target device (21) to display a target pattern; Controlling the distance adjustment device (22) to adjust the distance between the virtual target device (21) and the virtual image imaging device (23); Obtaining the spot pattern collected by the collection device (13); Based on the spot pattern, adjusting the focusing module (12) until the spot pattern collected by the collection device (13) meets the preset clarity, and outputting refractive data; Obtaining the user's subjective target recognition result; Based on the subjective target recognition result and the refractive data, outputting a comprehensive vision assessment report.

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