Space visual chart
By designing a spatial vision chart with multiple character surfaces perpendicular to the horizontal plane and vision test lines, the limitations of existing vision charts in large outdoor venues and at fixed distances are overcome, enabling vision testing in multi-distance and dynamic environments, and making it suitable for visual assessment in large indoor and outdoor spaces.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-22
- Publication Date
- 2026-04-07
AI Technical Summary
Existing indoor static planar vision charts are not suitable for large outdoor spaces and can only test vision at a fixed distance, with the optotypes located on the same plane.
Design a spatial vision chart including multiple character surfaces perpendicular to the horizontal plane. Each character surface is equipped with an optotype of the same length in the vertical direction. The distance between the character surface and the vision test line is different. The test subject moves along different test lines to conduct vision tests, simulating the visual needs in real-world scenarios.
It enables multi-distance and dynamic vision assessment in large indoor and outdoor spaces, simulating visual needs in real-world scenarios, and is suitable for vision testing in open spaces such as sports fields and squares.
Smart Images
Figure CN224085303U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of vision testing technology, specifically relating to a spatial vision chart. Background Technology
[0002] A visual acuity chart is an instrument used to measure visual acuity (visual acuity refers to the eye's ability to distinguish details between two objects) in order to accurately measure visual acuity. Existing visual acuity charts are designed as static, planar charts that can standardize and reflect an individual's visual acuity level at a specific distance. The symbols on the chart (hereinafter referred to as optotypes) are designed with standardized proportions, taking into account the visual acuity level required to correctly identify them at a given distance. For example, in the most commonly used "E-chart" (standard logarithmic visual acuity chart) in my country, each character has the same length and width along the vertical direction, while the width of each line is one-fifth of the total length of the character. The letter "E" is designed in different directions (up, down, left, right), and the observer needs to point out the direction of the opening of the letter "E" at a fixed distance (such as 3m, 5m, etc.). There are also various other forms, such as the Snellen chart (alphabet chart) and the Landolt circular visual acuity chart (C-chart chart).
[0003] However, existing indoor static planar vision charts have the following problems in use:
[0004] 1. Not suitable for outdoor spaces with a large proportion of outdoor areas.
[0005] 2. Vision can only be tested at a fixed distance.
[0006] 3. All targets are located on the same plane. Summary of the Invention
[0007] To address the shortcomings of the aforementioned technical problems, the purpose of this utility model is to provide a spatial vision chart that allows vision testing to be conducted in space.
[0008] Another objective of this invention is to provide a method for testing visual acuity based on the aforementioned spatial visual acuity chart.
[0009] The objective of this utility model is achieved through the following technical solution.
[0010] A spatial vision chart includes: n+1 character faces, which stand upright on a surface and perpendicular to a horizontal plane. The n+1 character faces are parallel to each other. Each character face has at least one optotype. When multiple optotypes are formed on each character face, all optotypes on the character face have the same vertical length. M vision detection lines parallel to the character faces are formed on the surface. The n+1 character faces are located on one side of the M vision detection lines, and optotype 1 faces the M vision detection lines. The distances of the n+1 character faces from the same vision detection line are different. There is no visual obstruction between the tester and the optotypes on all character faces at each vision detection line. The visual size of the optotypes on the n+1 character faces gradually decreases from near to far.
[0011] In the above technical solution, n is an integer greater than or equal to 1.
[0012] In the above technical solutions, the character surface is either a physical surface or a virtual plane.
[0013] In the above technical solution, when multiple icons are formed on each character surface, the multiple icons are located in the same row or different rows.
[0014] In the above technical solution, M is an integer greater than 1.
[0015] In the above technical solution, the M vision testing lines are parallel to each other.
[0016] In the above technical solution, taking the direction towards the vision test line as the front, the following conditions are met: y j H is the distance between the top of the viewpoint on the j-th character face and the horizontal plane. 人 H represents the test subject's line of sight height. j-1 Let y be the vertical length of the viewpoint on the character face preceding the j-th character face. j-1 x is the distance between the top of the viewpoint on the character face preceding the j-th character and the horizontal plane. j Let x be the distance between the line formed by the projection of the j-th character onto the horizontal plane and the vision test line. j-1 The distance between the line formed by the projection of the j-th character face onto the horizontal plane and the aforementioned visual acuity detection line.
[0017] In the above technical solutions, the surface is either a plane or an inclined plane.
[0018] In the above technical solution, the angle between the inclined plane and the horizontal plane is less than 90°.
[0019] The method for testing visual acuity using the aforementioned spatial visual acuity chart includes: the test subject first stands on one of the visual acuity testing lines. If all optotypes can be clearly observed, the test subject moves towards another visual acuity testing line in a direction away from the character surface, until the test subject observes at least one optotype on a character surface that is blurred. This visual acuity testing line is then used as a fixed line. The visual acuity test result—visual acuity V—is obtained based on the character surface where the test subject observes the clearest optotype that is furthest from the test subject while standing on the fixed line. Where, x i H is the distance between the line formed by the projection of the character surface of the clearest and farthest visual target observed by the tester from the fixed line onto the horizontal plane and the fixed line, and H is the vertical length of the clearest and farthest visual target 1 observed by the tester from the fixed line.
[0020] This utility model's spatial vision chart can be set up in large indoor spaces or open outdoor spaces, such as sports fields, squares, or parks. It can perform vision assessments at multiple distances and with dynamic adjustments within the space, simulating visual needs in real-world scenarios. By moving back and forth to view the spatial vision chart, it enables vision testing of the visual representation in a three-dimensional spatial environment. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of the spatial visual acuity chart.
[0022] Figure 2 This is a schematic diagram of the spatial visual acuity chart.
[0023] Figure 3 This is a schematic diagram of the spatial visual acuity chart.
[0024] Figure 4 This is a schematic diagram of the spatial vision chart.
[0025] Among them, 1 is the visual target, 2 is the surface, 3 is the vision test line, and 4 is the character surface. Detailed Implementation
[0026] The spatial vision chart of this utility model will now be described in detail with reference to the accompanying drawings and embodiments.
[0027] Example 1
[0028] As attached Figure 1 As shown, a spatial vision chart includes: n+1 character surfaces 4, which stand on surface 2 and are perpendicular to the horizontal plane. The n+1 character surfaces are parallel to each other, where n is an integer greater than or equal to 1. The character surfaces 4 can be physical surfaces or non-existent virtual planes. Each character surface has at least one optotype 1 (e.g., the "E" optotype). When multiple optotypes are formed on each character surface, the multiple optotypes can be located in the same row (e.g., ...). Figure 3 (as shown) or different rows (such as) Figure 4 As shown), all optotypes on the character surface have the same vertical length. M visual acuity testing lines 3, parallel to the character surface, are formed on surface 2, where M is an integer greater than 1. The M visual acuity testing lines are parallel to each other. The n+1 character surfaces are located on one side of the M visual acuity testing lines 3, and the optotype 1 faces the M visual acuity testing lines 3. The distances of the n+1 character surfaces from the same visual acuity testing line 3 are different. There is no visual obstruction between the tester and the optotype 1 on all character surfaces at each visual acuity testing line 3. The visual size of the optotypes on the n+1 character surfaces gradually decreases from near to far.
[0029] The method for testing visual acuity using the aforementioned spatial visual acuity chart includes: the test subject first stands on one of the visual acuity testing lines 3. If all optotypes 1 can be clearly observed, the test subject moves towards another visual acuity testing line 3 in a direction away from the character surface, until the test subject observes at least one character surface where optotype 1 appears blurred. This visual acuity testing line 3 (where the test subject is currently located) is used as a fixed line. The visual acuity test result—visual acuity V (expressed in decimal form)—is obtained based on the character surface where the test subject observes the clearest optotype and is furthest from the test subject while standing on the fixed line. Where, x i H is the distance between the fixed line and the line formed by the projection of the character face of the target that is clear and furthest from the tester when standing at the fixed line onto the horizontal plane. s The vertical length of the target 1 that is clear and furthest from the tester when standing on the fixed line.
[0030] Example 2
[0031] Based on Example 1, surface 2 can be a plane or an inclined plane. For example... Figure 2 As shown, the surface is an inclined plane (e.g., a slightly sloping hillside), and the angle between the inclined plane and the horizontal plane is less than 90°. The character surface 4 is directly fixed to the surface 2 or fixed to the surface 2 through a support structure such as a support frame.
[0032] like Figure 1 , Figure 3 and Figure 4 As shown, surface 2 is a plane parallel to the horizontal plane, and character surface 4 is directly fixed on surface 2 or fixed on surface 2 through support structures such as support frames.
[0033] Example 3
[0034] Based on Example 2, to ensure that the test subject has no visual obstruction between each visual acuity test line 3 and the optotypes 1 on all character surfaces, the optotypes 1 on the character surfaces are staggered. For example... Figure 3 As shown.
[0035] Example 4
[0036] Based on Example 2, the distances from the top of the optotype 1 on the n+1 character surfaces, from near to far from the same visual acuity testing line 3, to the horizontal plane are y0, y1, ..., y2. n The distances between the lines formed by the projections of the n+1 character faces from the same visual acuity test line 3 (from closest to furthest) onto the horizontal plane and the visual acuity test line 3 are x0, x1, ..., x2. n+1 .
[0037] Taking the direction towards visual acuity test line 3 as the front, in order for the forward optotype 1 not to obstruct the rear optotype 1, the following must be satisfied: y j H is the distance between the top of the viewpoint 1 on the j-th character face and the horizontal plane. 人 The test subject's line of sight height (line of sight height: the distance from the test subject's eyes to the horizontal plane, typically H for adults). 人 For 1.5m, the child's H 人 (0.5m), H j-1 Let y be the vertical length of the viewpoint 1 on the character face preceding the j-th character face. j-1 x is the distance between the top of the viewpoint 1 on the character face preceding the j-th character and the horizontal plane. j Let x be the distance between the line formed by the projection of the j-th character onto the horizontal plane and the vision test line 3. j-1 The distance between the line formed by the projection of the j-th character face onto the horizontal plane and the aforementioned visual acuity test line 3.
[0038] Example 5
[0039] Based on Example 4, when all H of the target 1 s When both are 0.072m, Different x i The visual acuity measurements are shown in Table 1.
[0040] Table 1
[0041]
[0042]
[0043] The above description of the present utility model is exemplary. It should be noted that, without departing from the core of the present utility model, any simple modifications, alterations, or other equivalent substitutions that can be made by those skilled in the art without creative effort fall within the protection scope of the present utility model.
Claims
1. A spatial vision chart, characterized in that, include: There are n+1 character surfaces (4), which stand on the surface (2) and are perpendicular to the horizontal plane. The n+1 character surfaces (4) are parallel to each other. Each character surface (4) has at least one optotype (1). When multiple optotypes (1) are formed on each character surface (4), all optotypes (1) on the character surface (4) have the same length in the vertical direction. M vision detection lines (3) are formed on the surface (2) that are parallel to the character surfaces (4). The n+1 character surfaces (4) are located on one side of the M vision detection lines (3) and the optotypes (1) face the M vision detection lines (3). The distances between the n+1 character surfaces (4) and the same vision detection line (3) are different. There is no visual obstruction between the tester and the optotypes (1) on all the character surfaces (4) at each vision detection line (3). The visual size of the optotypes (1) on the n+1 character surfaces (4) gradually decreases from near to far.
2. The spatial vision chart according to claim 1, characterized in that, n is an integer greater than or equal to 1.
3. The spatial vision chart according to claim 1, characterized in that, The character surface (4) is either a physical surface (2) or a virtual plane.
4. The spatial vision chart according to claim 1, characterized in that, When multiple viewpoints (1) are formed on each character face (4), the multiple viewpoints (1) are located in the same row or different rows.
5. The spatial visual acuity chart according to claim 1, characterized in that, M is an integer greater than 1.
6. The spatial vision chart according to claim 1, characterized in that, The M vision test lines (3) are parallel to each other.
7. The spatial vision chart according to claim 1, characterized in that, Taking the direction towards the visual acuity test line (3) as the front, the following conditions are met: y j H is the distance between the top of the viewpoint (1) on the j-th character face (4) and the horizontal plane. 人 H represents the test subject's line of sight height. j-1 Let y be the vertical length of the viewpoint (1) on the preceding character face (4) of the j-th character face (4). j-1 x is the distance between the top of the viewpoint (1) on the previous character face (4) of the j-th character face (4) and the horizontal plane. j x is the distance between the line formed by the projection of the j-th character face (4) onto the horizontal plane and the vision test line (3). j-1 The distance between the line formed by the projection of the j-th character surface (4) onto the horizontal plane and the aforementioned visual acuity detection line (3).
8. The spatial vision chart according to claim 1, characterized in that, Surface (2) is a plane or an inclined plane.
9. The spatial vision chart according to claim 8, characterized in that, The angle between the inclined plane and the horizontal plane is less than 90°.