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A kind of calibrated eye chart and using method of eye chart

A vision chart and visual target technology, which is applied in the field of calibration vision chart, can solve the problems of distortion of test results, etc., and achieve the effects of high accuracy, simple structure, easy recording and statistical analysis

Active Publication Date: 2022-04-19
朱爱斌
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In addition, for various reasons, some children have memorized the entire standard visual acuity chart. As long as the children can recognize the position of "E", they can accurately tell the direction of E according to their previous memory, which will also directly lead to distortion of test results

Method used

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  • A kind of calibrated eye chart and using method of eye chart
  • A kind of calibrated eye chart and using method of eye chart
  • A kind of calibrated eye chart and using method of eye chart

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Embodiment Construction

[0032] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0033] like figure 2 and image 3 Shown is the structural schematic diagram of the calibration vision chart of the present invention, a calibration vision chart of the present invention, including multiple rows of "E" word optotypes arranged from top to bottom from large to small, and the size of "E" word optotypes in each row Identical and equal spacing, described E " word visual mark comprises 3 black stripes I that are arranged in parallel, the black stripe II that is connected at the end of 3 black stripes I and is vertical with black stripe I and is arranged on adjacent black stripes I. Between the white stripes, the multi-line "E" optotypes contain the "E" optotypes with different black and white contrast ratios of black stripe I and white stripes, and different width contrasts of black stripe I and white stripes.

[0034] In a pre...

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Abstract

The invention discloses a calibration eye chart, which comprises a plurality of rows of "E" optotypes arranged from large to small and from top to bottom. The "E" optotypes in each row have the same size and equal spacing. Including 3 black stripes I arranged in parallel, black stripes II connected to the ends of the 3 black stripes I and perpendicular to the black stripes I, and white stripes arranged between adjacent black stripes I, with multiple lines of "E" The visual standard contains the "E" word visual standard with different black and white contrast ratios of black stripes I and white stripes and different width contrast ratios of black stripes I and white stripes; the present invention sets the "black and white contrast" and "spatial frequency The calibrated eye chart designed according to these technical parameters objectively and scientifically reflects the eye's perception of changes in contrast sensitivity; it is not only suitable for the health checkup of people with normal vision, but also suitable for the detection of various people with low vision Diagnostics, opticians and corrective rehabilitation.

Description

technical field [0001] The invention belongs to equipment for testing eyes; the technical field of instruments for inspecting eyes, in particular to a calibration eye chart and a method for using the eye chart. Background technique [0002] For the detection of children's vision in modern medical care, a standard visual acuity comparison table is generally used (by identifying the orientation of different sizes of E to determine the subject's vision level), and adults need to ask children questions to obtain the corresponding detection results; The visual acuity chart is scaled into the LCD touch screen according to a certain distance ratio (the spatial distance between the subject and the calibrated visual chart: the distance between the subject's eyes and the above-mentioned LCD touch screen), and is used as a detection image to detect children. If so, adults still need to guide the children to ask questions, and let the children say the corresponding results. [0003] Ho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B3/00A61B3/032A61B3/04
CPCA61B3/032A61B3/04A61B3/0041
Inventor 朱爱斌吕银月陈威
Owner 朱爱斌
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