CN110652282A - Resolution grade visual chart - Google Patents
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- CN110652282A CN110652282A CN201810688544.XA CN201810688544A CN110652282A CN 110652282 A CN110652282 A CN 110652282A CN 201810688544 A CN201810688544 A CN 201810688544A CN 110652282 A CN110652282 A CN 110652282A
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- A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
- A61B3/02—Subjective types, i.e. testing apparatus requiring the active assistance of the patient
- A61B3/028—Subjective types, i.e. testing apparatus requiring the active assistance of the patient for testing visual acuity; for determination of refraction, e.g. phoropters
- A61B3/032—Devices for presenting test symbols or characters, e.g. test chart projectors
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Abstract
The invention discloses a resolution-level visual chart, which comprises a visual chart light box and an LED light source arranged in the visual chart light box, wherein a visual target group is arranged on a light box sheet of the visual chart light box, ten levels of visual target rows are arranged on the visual target group according to target values, three visual targets are arranged on each visual target row, the patterns of the visual targets are uniform black-white line pair patterns, the widths of black lines and white lines are the same, the line direction of each visual target is randomly set to be vertical, 45 degrees inclined to the left or 45 degrees inclined to the right, and the decimal visual target values of the ten levels of the visual target rows are 0.9, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.8 and 2.0 in sequence. The invention can quantitatively evaluate the fine vision of the testee, thereby judging whether the resolution ability of the human eyes can feel the fine dot matrix image obtained by electronic means, and quantitatively evaluating the fine vision of the testee, thereby carrying out comparative evaluation on the vision of various vision correction means by a fine quantitative analysis means.
Description
Technical Field
The invention relates to an eye chart, in particular to a resolution level eye chart.
Background
Considering that the high contrast logarithmic visual chart visual target value used at present in international and domestic routine reaches 1.0 or more and only has 3 rows (1.0, 1.2 and 1.5), the visual resolution capability can be evaluated by judging the gap direction of the E visual target. The defects are that there is no subdivision gradient between the 3 lines of visual targets, the vision is better than 1.5, there is no more precise quantitative evaluation level, and the tested eye can judge that the gap direction of the E visual target is not equal to the content contained in the E visual target clearly.
In view of the fact that current video terminals such as cameras, video recorders, televisions, mobile phones and the like are frequently quantized into tens of millions of pixels, commonly called high definition or ultra definition, but there is no quantitative analysis means for the fine resolution capability of human eyes, and there is a possibility that the resolution capability of human eyes is limited by physiological limits, and the high-quality dot matrix images obtained by electronic means cannot be resolved and experienced at all, or the difference of the definition of electronic images after reaching a certain pixel is not large when being seen by normal human eyes.
In view of the fact that the prior various vision correction means such as femtosecond laser keratectomy, high-resolution contact lenses, holographic frame glasses and the like are claimed to have high-resolution or ultra-clear functions, however, the quantitative test results of the vision obtained by the correction means with the high-resolution or ultra-clear functions and the common correction glasses are not greatly different by adopting the conventional visual acuity chart test, and possibly, the advanced vision correction means can really bring clearer visual perception to human beings, and the advanced vision correction means cannot be contrastively evaluated due to the fact that the resolution capability of the conventional visual acuity chart to human eyes lacks of fine quantitative analysis means.
Disclosure of Invention
The present invention is directed to solving the problems of the background art described above by providing a resolution-level visual acuity chart for performing comparative evaluation of visual acuity in various visual acuity correction means by a fine quantitative analysis means.
In order to achieve the purpose, the invention provides the following technical scheme:
the utility model provides a resolution level visual chart, includes the visual chart lamp house and arranges in the inside LED light source of visual chart lamp house, be provided with visual target group on the lamp house piece of visual chart lamp house, visual target group is provided with the visual target line of ten grades according to the mark value, and every visual target line is provided with three visual target, the figure of visual target is even black and white line to figure, and black line is the same with white line width, and the lines direction of every visual target sets up to perpendicular, left skew 45 or right skew 45 at random.
As a further scheme of the invention:
the visual chart lamp box is a milky PC lamp box.
As a further scheme of the invention:
the decimal sighting mark values of the ten-level sighting mark rows are 0.9, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.8 and 2.0 in sequence.
As a further scheme of the invention:
the distance between each row of sighting marks and the distance between each column of sighting marks are both larger than or equal to the diameter of the sighting marks.
As a further scheme of the invention:
the diameter of the sighting mark is a perfect circle of 35mm or 7 mm.
As a still further scheme of the invention:
when the diameter of the sighting mark is 35mm, the detection distance of the visual chart is 5 m; the diameter of the optotype is 7mm, and the detection distance of the visual chart is 0.4 m.
Compared with the prior art, the invention has the beneficial effects that:
the invention can quantitatively evaluate the fine vision of the testee, thereby judging whether the resolution ability of the human eyes can feel the fine dot matrix image obtained by electronic means, and quantitatively evaluating the fine vision of the testee, thereby carrying out comparative evaluation on the vision of various vision correction means by a fine quantitative analysis means.
Drawings
Fig. 1 is one of the principle diagrams of the vision test of the present invention.
Fig. 2 is a second schematic diagram illustrating the principle of performing a vision test according to the present invention.
Fig. 3 is a schematic diagram of the design principle of the present invention.
Detailed Description
The technical solution of the present patent will be described in further detail with reference to the following embodiments.
Referring to fig. 1-3, a resolution level visual acuity chart comprises a visual acuity chart light box and an LED light source arranged in the visual acuity chart light box, wherein a visual target group is arranged on a light box sheet of the visual acuity chart light box, ten levels of visual target rows are arranged in the visual target group according to target values, the decimal visual target values of the ten levels of the visual target rows are sequentially 0.9, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.8 and 2.0, three visual targets are arranged in each visual target row, the visual target patterns are uniform black and white line patterns, the width of the black line and the white line is the same, the contrast of the black line and the white line is not less than 95%, the line direction of each visual target is randomly set to be vertical, 45 degrees to the left oblique or 45 degrees to the right oblique, and the difficulty in distinguishing the horizontal lines when the tested eye squints is detected is not set, so that the horizontal lines are not set.
The visual chart lamp box is a milky PC lamp box. The distance between each row of sighting marks and the distance between each column of sighting marks are both larger than or equal to the diameter of the sighting marks. The diameter of the sighting mark is a perfect circle of 35mm or 7 mm. When the diameter of the sighting mark is 35mm, the detection distance of the visual chart is 5 m; the diameter of the optotype is 7mm, and the detection distance of the visual chart is 0.4 m.
The principle of the vision test of the resolution level visual acuity chart is as follows: light emitted by a light-emitting point target enters eyes with normal vision or eyes with normal vision level through refractive correction, sharp image points are not formed on a retina focal image surface of the eyes, and a circle of confusion image with a certain diameter is formed. It is known that if a static visual cell which is not subjected to light stimulation can be separated between two circle images formed by two adjacent luminous point targets on a retina focal image plane, a fixation eye can distinguish the two adjacent luminous points into two independent targets, as shown in fig. 1, and if a static visual cell which is not subjected to light stimulation cannot be accommodated between the two circle images formed by the two adjacent luminous point targets on the retina focal image plane, the fixation eye can only understand the two adjacent luminous points as one target, as shown in fig. 2. In actual detection, the individual difference exists in the value of the distance between the centers of the two circle of confusion images, and the method can be used for quantifying the vision of the tested eye. The E-shaped visual target of the visual chart is gradually reduced, so that the distance between two white lines among three black transverse lines of the E-shaped visual target is gradually close, when the last static visual cell which is not subjected to light stimulation between the two white lines on the dispersed image on the retina is stimulated by light, the tested eye cannot recognize the direction of the E-shaped visual target, and the method can be used for quantifying the critical vision of the tested eye.
The design principle of the resolution level visual acuity chart is as follows: and if the elevation of the E visual target is h, the h is equal to the product of the tangent of the E visual target to the visual angle of the tested eye and the testing distance d, and the calculation formula is as follows.
Formula (1)
As shown in fig. 3, when the testing distance d is 5m, the elevation of the visual target h is determined by the minimum visual target which can be distinguished by the tested eye to the visual angle α of the eye, since the visual angle is positively correlated with the elevation and the elevation is negatively correlated with the vision, and v =1/α when the vision is v. When the gazing distance is 5m, the visual angle of the minimum visual target which can be distinguished by the tested eye to the eye is 5 degrees, the E visual target transversely is 5 black-white alternating horizontal lines with equal width, each horizontal line has a visual angle of 1 degree to the tested eye, as mentioned above, if the image of the black line between two white lines on the retina can cover a static visual cell which is not subjected to light stimulation, the tested eye can separate the two white lines into two targets, and can distinguish the direction of the E visual target, so the critical vision is equal to one of 1 minute visual angle, v =1/1, also called 1.0. This is a quantitative method of fractional vision.
As shown in fig. 3, when the viewing angle is 5 °, the minimum distinguishable visual target determines the elevation of the visual target h for the distance d from the measured eye at the viewing angle of 5 ° to the measured eye. If the vision is v, v =5/d, where 5 is the fixation distance (m is a unit), and d is the distance from the measured eye when the minimum visual target capable of being resolved makes a 5 ° visual angle with the measured eye. When the minimum visual target capable of being resolved has a distance of 5m to the measured eye at a viewing angle of 5 ° to the measured eye, the visual acuity is v =5/5 (1.0), and when the minimum visual target capable of being resolved has a distance of 50m to the measured eye at a viewing angle of 5 ° to the measured eye, the visual acuity is v =5/50 (0.1). This is a quantitative method of fractional vision.
The method for calculating the elevation and the standard width of the resolution level visual chart comprises the following steps: when the distance from the measured eye to the minimum visual target capable of being resolved to the measured eye at the visual angle of 5 degrees is d, the formula (1) gives a calculation method of the elevation h of the visual chart, the denominator of the fractional vision is multiplied by tan5 degrees (constant 0.001454), the elevation of the visual target can be obtained, and the elevation value is divided by 5 to obtain the target width of the visual target.
For example: the 0.5 optotype has a fractional vision of 5/10, i.e., a chart with a standard test distance of 5m, and the 0.5 optotype calculates the 5' viewing angle of the eye to be tested at 10m, substituting d equal to 10m into equation (1).
The elevation of the 0.5E-target is 14.54mm and the width of each line is 2.91 mm.
The line widths of the resolution level hyperopia levels with a gaze distance of 5m can be calculated according to the above calculation method, as shown in table 1.
TABLE 1 Scale Width of each level of distant resolution level eye chart with fixation distance of 5m
| Decimal vision | Fractional vision | Line width (mm) |
| 0.9 | 5000/5556 | 1.616 |
| 1.0 | 5000/5000 | 1.454 |
| 1.1 | 5000/4545 | 1.322 |
| 1.2 | 5000/4167 | 1.212 |
| 1.3 | 5000/3846 | 1.118 |
| 1.4 | 5000/3571 | 1.039 |
| 1.5 | 5000/3333 | 0.969 |
| 1.6 | 5000/3125 | 0.909 |
| 1.8 | 5000/2778 | 0.808 |
| 2.0 | 5000/2500 | 0.727 |
Diameter of visual mark 35mm
Similarly, the line widths for each level of the resolution level near vision chart can be calculated for a gaze distance of 0.4m, as shown in Table 2.
TABLE 2 elevation and standard width of each level of short-distance resolution level eye chart with 0.4m fixation distance
| Decimal vision | Fractional vision | Line width (mm) |
| 0.9 | 400/444 | 0.129 |
| 1.0 | 400/400 | 0.116 |
| 1.1 | 400/364 | 0.106 |
| 1.2 | 400/333 | 0.097 |
| 1.3 | 400/308 | 0.090 |
| 1.4 | 400/286 | 0.083 |
| 1.5 | 400/267 | 0.969 |
| 1.6 | 400/250 | 0.073 |
| 1.8 | 400/222 | 0.065 |
| 2.0 | 400/200 | 0.058 |
Diameter of visual mark 7mm
The invention can quantitatively evaluate the fine vision of the testee, thereby judging whether the resolution ability of the human eyes can feel the fine dot matrix image obtained by electronic means, and quantitatively evaluating the fine vision of the testee, thereby carrying out comparative evaluation on the vision of various vision correction means by a fine quantitative analysis means.
Although the preferred embodiments of the present patent have been described in detail, the present patent is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present patent within the knowledge of those skilled in the art.
Claims (6)
1. The utility model provides a resolution level visual chart, its characterized in that includes the visual chart lamp house and arranges in the inside LED light source of visual chart lamp house, be provided with the sighting target group on the lamp house piece of visual chart lamp house, the sighting target group is provided with the sighting target line of ten grades according to the mark value, and every sighting target line is provided with three sighting target, the figure of sighting target is even black and white line to figure, and black line is the same with white line width, and the lines direction of every sighting target sets up to perpendicular, 45 or 45 of inclining to the left side at random.
2. The vision chart of claim 1, wherein the vision chart light box is a milky white PC light box.
3. The visual acuity chart of claim 1, wherein the decimal scale values of the ten-level visual acuity row are 0.9, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.8 and 2.0 in sequence.
4. The resolution-level eye chart of claim 1, wherein the spacing between each row of optotypes and each column of optotypes is greater than or equal to the diameter of the optotypes.
5. The vision table of claim 1, wherein the optotype has a diameter of 35mm or 7mm perfect circle.
6. The visual acuity chart of claim 5, wherein the visual acuity chart has a detection distance of 5m when the visual target has a diameter of 35 mm; the diameter of the optotype is 7mm, and the detection distance of the visual chart is 0.4 m.
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| CN201810688544.XA CN110652282A (en) | 2018-06-28 | 2018-06-28 | Resolution grade visual chart |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1266667A (en) * | 2000-01-20 | 2000-09-20 | 周祥烈 | Visual chart for both hyperopia and myopia |
| CN1273079A (en) * | 2000-04-11 | 2000-11-15 | 周祥烈 | Metric unit method of vision and equipment for examining vision |
| CN1586391A (en) * | 2004-06-30 | 2005-03-02 | 中国人民解放军海军总医院 | General type visual chart |
| CN201414787Y (en) * | 2009-07-13 | 2010-03-03 | 李洪彦 | Visual testing chart light box for preventing visual testing chart from being memorized |
| CN104706314A (en) * | 2015-03-19 | 2015-06-17 | 京东方科技集团股份有限公司 | Vision detection device and method |
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- 2018-06-28 CN CN201810688544.XA patent/CN110652282A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1266667A (en) * | 2000-01-20 | 2000-09-20 | 周祥烈 | Visual chart for both hyperopia and myopia |
| CN1273079A (en) * | 2000-04-11 | 2000-11-15 | 周祥烈 | Metric unit method of vision and equipment for examining vision |
| CN1586391A (en) * | 2004-06-30 | 2005-03-02 | 中国人民解放军海军总医院 | General type visual chart |
| CN201414787Y (en) * | 2009-07-13 | 2010-03-03 | 李洪彦 | Visual testing chart light box for preventing visual testing chart from being memorized |
| CN104706314A (en) * | 2015-03-19 | 2015-06-17 | 京东方科技集团股份有限公司 | Vision detection device and method |
Non-Patent Citations (1)
| Title |
|---|
| 齐备: ""视力表（一）"", 《中国眼镜科技杂志》 * |
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