Near vision chart with distance marking rod
A near-sighted chart and distance technology, which is applied in the fields of eye testing equipment, medical science, diagnosis, etc., can solve the problems of large differences in test results, and achieve the effect of treating or correcting myopia and accurate test results
Inactive Publication Date: 2012-04-18
南通盛利重工机械制造有限公司
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Problems solved by technology
[0002] The existing near vision chart generally specifies a detection distance of 250 mm or 400 mm when testing eyesight. Unlike the distance vision chart, the detection distance is 5000 mm or 5 meters away, and the distance difference is dozens of times when testing vision. mm does not affect the accuracy of judging vision
However, the detection distance of the near vision chart differs by tens of millimeters, and the detection results are quite different.
Method used
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specific Embodiment approach 1
[0010] Specific implementation mode one: combine Figure 1 ~ Figure 3 Describe this embodiment, this embodiment comprises visual target substrate 1, the first sign post 2, the second sign post 3, the first forehead plate 4 and the second forehead plate 5, one end of the first sign post 2 and visual target substrate 1 Fixedly connected, the other end of the first marking rod 2 is hinged with one end of the second marking rod 3, and the first forehead plate 4 is hinged on the end of the hinge between the first marking rod 2 and the second marking rod 3, and the second marking rod 3. A second frontal plate 5 is hinged on the end of the other end.
specific Embodiment approach 2
[0011] Specific implementation mode two: combination figure 2 To describe this embodiment, the distance L between the first forehead plate 4 and the layout of the visual target substrate 1 in this embodiment is 250 mm. The distance V between the second forehead plate 5 and the layout of the visual target substrate 1 is 400mm. Others are the same as the first embodiment.
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The invention discloses a near vision chart with a distance marking rod. The near vision chart comprises a sighting target base plate, a first mark rod, a second mark rod, a first frontal plate and a second frontal plate, wherein one end of the first mark rod is fixedly connected with the sighting target base plate; the other end of the first mark rod is hinged with one end of the second mark rod; the first frontal plate is hinged on an end head of a hinging position of the first mark rod and the second mark rod; and the second frontal plate is hinged on an end head of the other end of the second mark rod. When the test distance is 250mm, only the first mark rod is used; when the test distance is 400mm, the first frontal plate is screwed up and the second mark rod is screwed forwards so as to keep the first mark rod and the second mark rod on the same straight line, and the position of the second frontal plate is regulated well; when the near vision chart with the distance marking rod is used for testing vision, the two test distances can be selected, and the forehead of a testee is adhered to the frontal plate; and the distance between the frontal plate and the sighting target base plate is fixed, so that the test result of the vision is accurate.
Description
technical field [0001] The invention relates to a near vision chart. Background technique [0002] The existing near vision chart generally specifies a detection distance of 250 mm or 400 mm when testing vision. Unlike a distance vision chart, the detection distance is 5000 mm or 5 meters, and the distance difference is dozens of times when testing vision. Millimeters do not affect the accuracy of judging vision. However, the detection distance of the near vision chart differs by tens of millimeters, and the detection results are quite different. How to control the distance between the human eye and the eye chart at a standard distance is a problem that needs to be solved. Contents of the invention [0003] The purpose of the present invention is to solve the problem that the detection distance specified by the existing near vision chart is 250 millimeters or 400 millimeters when detecting eyesight. Unlike the distance vision chart, the detection distance is 5000 millime...
Claims
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Inventor 谢友国张广勤
Owner 南通盛利重工机械制造有限公司