CN201987544U - Circular visual testing chart - Google Patents
Circular visual testing chart Download PDFInfo
- Publication number
- CN201987544U CN201987544U CN2011200458505U CN201120045850U CN201987544U CN 201987544 U CN201987544 U CN 201987544U CN 2011200458505 U CN2011200458505 U CN 2011200458505U CN 201120045850 U CN201120045850 U CN 201120045850U CN 201987544 U CN201987544 U CN 201987544U
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- China
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- visual testing
- testing chart
- viewport
- chart
- visual
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- Expired - Fee Related
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Abstract
A circular visual testing chart mainly solves the problem of the traditional visual testing chart that the pointing directions of characters are easily written down in advance to lead to inaccurate measurement result. The circular visual testing chart comprises a visual testing chart body and is characterized in that the visual testing chart body comprises an endless band and a viewport, wherein visual testing characters arranged abreast are arranged on the endless band respectively, the viewport is a fixed framework with a transparent middle, and the endless band penetrates the viewport and is movably connected with the viewport. When the circular visual testing chart is used, the viewport is adjusted to the height corresponding to the body height of an examinee and fixed, and an operator rotates the endless band to determine the vision of the examinee. The result of testing the vision is more scientific and more accurate, the preliminary conditions of visual function can be understood simply and rapidly, and the circular visual testing chart effectively reduces and avoids the problem of great test deviation due to the human factors in the traditional visual testing chart and has significance in clinical diagnosis and treatment of eye diseases.
Description
Technical field
This utility model relates to a kind of visual acuity chart, specifically a kind of Landolt.
Background technology
Visual acuity chart is according to the principle design at visual angle.So-called visual angle is exactly by extraneous 2 light that send, through the formed angle of ophthalmic node.Under the normal condition, the formed visual angle of minimum range that human eye can be told point-to-point transmission is the minimum visual angle, promptly one minute visual angle.Visual acuity chart is that unit designs with one fen visual angle.But what traditional visual acuity chart was mainly checked is central vision, promptly check the recessed visual acuity of macula retinae district center, often the gradient of height and health and visual acuity chart suspension height and operator teach bar sensing and shading situation to influence the result of test because anthropic factor such as examinee stand when measuring vision; Character that traditional visual acuity chart is also in advance write down each row by the people easily towards, cause test result inaccurate.
The utility model content
The purpose of this utility model is to provide a kind of Landolt, and this visual acuity chart can science, measure people's vision exactly.
The technical scheme in the invention for solving the technical problem is: a kind of Landolt, comprise the visual acuity chart body, it is characterized in that, described visual acuity chart body is made of endless belt and vision window, on the endless belt, be provided with the eyesight testing character that is arranged side by side, the vision window is middle penetrating fixed frame, and the endless belt is passed the vision window and flexibly connected with its formation.
The beneficial effects of the utility model are: the test result that can make vision is science, accurately more, can simply promptly recognize the preliminary situation of visual performance, the big problem of test deviation that effectively reduces and avoided traditional visual acuity chart to cause because of anthropic factor has great significance to the clinical diagnosis of oculopathy treatment.
Description of drawings
Fig. 1 is a structural representation of the present utility model.
Among the figure: 1 endless belt, 2 vision windows.
The specific embodiment
As shown in Figure 1.A kind of Landolt, comprise the visual acuity chart body, described visual acuity chart body is made of endless belt 1 and vision window 2, is provided with the eyesight testing character that is arranged side by side on endless belt 1, vision window 2 is middle penetrating fixed frame, and endless belt 1 is passed vision window 2 and flexibly connected with its formation.
During use, vision window 2 is adjusted to and the corresponding height of examinee's height and fix, the operator rotates the vision of endless belt 1 with definite examinee.The test result that this utility model can make vision is science, accurately more, can simply promptly recognize the preliminary situation of visual performance, the big problem of test deviation that effectively reduces and avoided traditional visual acuity chart to cause because of anthropic factor has great significance to the clinical diagnosis of oculopathy treatment.
Claims (1)
1. a Landolt comprises the visual acuity chart body, it is characterized in that, described visual acuity chart body is made of endless belt and vision window, be provided with the eyesight testing character that is arranged side by side on the endless belt, the vision window is middle penetrating fixed frame, and the endless belt is passed the vision window and flexibly connected with its formation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200458505U CN201987544U (en) | 2011-02-22 | 2011-02-22 | Circular visual testing chart |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200458505U CN201987544U (en) | 2011-02-22 | 2011-02-22 | Circular visual testing chart |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201987544U true CN201987544U (en) | 2011-09-28 |
Family
ID=44664056
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200458505U Expired - Fee Related CN201987544U (en) | 2011-02-22 | 2011-02-22 | Circular visual testing chart |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201987544U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105996974A (en) * | 2016-06-25 | 2016-10-12 | 利辛县眼病防治所 | Portable and changeable visual acuity chart box |
-
2011
- 2011-02-22 CN CN2011200458505U patent/CN201987544U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105996974A (en) * | 2016-06-25 | 2016-10-12 | 利辛县眼病防治所 | Portable and changeable visual acuity chart box |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110928 Termination date: 20120222 |