CN201157349Y - Simple sight test card - Google Patents
Simple sight test card Download PDFInfo
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- CN201157349Y CN201157349Y CNU2008200321303U CN200820032130U CN201157349Y CN 201157349 Y CN201157349 Y CN 201157349Y CN U2008200321303 U CNU2008200321303 U CN U2008200321303U CN 200820032130 U CN200820032130 U CN 200820032130U CN 201157349 Y CN201157349 Y CN 201157349Y
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- sighting target
- vision
- visual
- test
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Abstract
The utility model relates to a simple vision test card which is provided with a card, the facade of the car is white and the central position of the facade of the card is provided with a black visual mark. 3 to 81 black visual marks of the same size with the visual mark on the facade and of random facing directions are arranged on the back of the card, and the visual marks on the back are arrayed in a central symmetry mode. The visual marks can change the facing directions with the rotation of the card to increase the credibility of the test. The vision of a testee can be determined by changing the distance between the test card and the eyes of the testee. The back of the card is designed to test whether a crowded phenomenon happens to the vision. The simple vision test card is smart and portable and can find out the vision of a testee rapidly and exclude the interference of memory because the facing directions of the visual mark gaps are arbitrarily arranged. In addition, a mixed use of single visual marks and multiple visual marks can help to find out rapidly whether a crowded phenomenon happens to the tested eyes.
Description
Technical field
This utility model relates to a kind of eyesight testing instrument, particularly a kind of simple and easy eyesight testing card.
Background technology
In the prior art, the mode of the most frequently used survey vision is: by the standard visual acuity chart of a set form, after setting measuring distance, with the people who shows tested person one by one of the sighting target on the visual acuity chart, according to the position of the minimum sighting target that the people saw clearly of tested person, how many visions that draws the tested person people is.Its weak point is: owing to the number of the every capable sighting target of standard visual acuity chart, be oriented fixed number, and the interference that the accuracy that vision detects is remembered easily, even might be recited by the person who is ambitious or tenacious of purpose, do not reach the purpose of test.
Summary of the invention
The technical problems to be solved in the utility model is at the deficiencies in the prior art, has proposed the simple and convenient simple and easy accurately eyesight testing card of a kind of test.
The technical problems to be solved in the utility model is achieved through the following technical solutions, and a kind of simple and easy eyesight testing card is characterized in: be provided with a card, the front of card is a white, is provided with a black sighting target in the card face center.
The technical problems to be solved in the utility model can also come to realize that further described sighting target is E word or C word by the following technical programs.
The technical problems to be solved in the utility model can also come to realize that further described card is circle or regular polygon by the following technical programs.
The technical problems to be solved in the utility model can also come further to realize by the following technical programs, the back side of card is white, be provided with at the back side of card 3～81 the same with positive sighting target size, towards at random black sighting target, the sighting target at the back side layout that is centrosymmetric.
The technical problems to be solved in the utility model can also be come by the following technical programs further to realize, is provided with 3～25 sighting targets at the back side of card.
The technical problems to be solved in the utility model can also come further to realize by the following technical programs, the center of card back be provided with one with the card face sighting target towards consistent sighting target.
Eyesight testing card of the present utility model is a hand-holdable card, white gravoply, with black engraved characters, sighting target can with the rotation of card change towards, increase the credibility of test.By changing the distance between test chart and the experimenter's eyes, according to formula
Can determine tested person people's vision.Wherein, V is tested person person's a vision, and d is the distance that tested person person's reality can be seen sighting target clearly, and D is the standard testing distance, and V1 is for seeing the standard vision of this sighting target clearly at gauged distance, and the default value of V1 is 1.0.For getting rid of crowding phenomenon, so be provided with a plurality of sighting targets of the layout that is centrosymmetric at the back side of this test chart.Described crowding phenomenon is meant: point of fixation and close between the sighting target unusual profile and influence each other, cause the more single sighting target of ability of differentiating the sighting target that is arranged in rows poor.Compared with prior art, this simple and easy eyesight testing card lightly is easy to carry, can understand those who are investigated's vision situation rapidly, and because the sighting target breach towards any appearance, can get rid of memory and disturb, haplopia mark and many sighting targets mix to use to understand quickly to be examined whether crowding phenomenon is arranged in addition.
Description of drawings
Fig. 1 is a Facad structure sketch of the present utility model.
Fig. 2 is a kind of schematic rear view of test chart of the present utility model.
The specific embodiment
A kind of simple and easy eyesight testing card is provided with a card 1, and the front of card 1 is a white, is provided with a black sighting target 2 in the card face center.The sighting target type can be designed to E word or C word etc.The single sighting target of black is placed on the center of the regular polygon of white background or circular flat, the any optional paper wood of the material of card, plastics, lucite, glass, film or the like, but to conveniently grasp or rotate, flat shape also can be any, but will note and can not shape facility that be convenient to the memorize direction be arranged to those who are investigated, preferably selects circle or regular polygon.
Be to get rid of crowding phenomenon, the back side of card also is made as white, be provided with at the back side of card 3～81 with positive sighting target big or small the same, towards at random black sighting target, the sighting target at the back side layout that is centrosymmetric.The optimum number of the sighting target at the back side of card is 3～25 sighting targets.The center that is preferably in card back be provided with one with the card face sighting target towards consistent sighting target.Like this, just card can be turned over, just can know indicating whether correctly of tested person person behind at card.
Design the sighting target size according to the measuring distance of wanting:
The normal eye wants to differentiate two points, and the visual angle of actual needs approximates 1 ' angle greatly, so 1 ' angle is located at the visual angle of minimum.
The E word symbol of 1.0 row on the international standard visual acuity chart, see at 5 meters, its whole character forms 5 ' angle on retina, the width of its each stroke and each are gesticulated a space and are respectively formed 1 ' angle, if can correctly be familiar with the character of this delegation, equal 1 ' angle, that is this eye has twenty-twenty vision with regard to the minimum visual angle that means this, so be recorded as 1.0
h＝Dtg1′
H＝5h＝5Dtg1′
Wherein: D is the standard testing distance,
H is stroke width or stroke gap length,
H is the sighting target height,
tg1′＝0.00029。
When being made as 5 meters as D, the actual distance that can see this sighting target clearly of normal eye also should be 5 meters, H=5Dtg1 '=5 * 5 * 0.00029=0.00725 (rice)=7.25 (millimeter) then,
When D was 5 meters, the height of sighting target should be 7.25 millimeters.
When if D is made as 6 meters, H=5Dtg1 '=5 * 6 * 0.00029=0.0087 (rice)=8.7 (millimeter) then, the height of sighting target should be 8.7 millimeters.
Inspection method is given an example: employing D is 5 meters a sighting target, sighting target places bright place, examiner's hand-held target (sighting target be examined eye contour) is (examiner is relative with the those who are investigated front) from 5 meters of those who are investigated, those who are investigated see sighting target with a glance (verification certificate eye vision) or eyes (looking into binocular vision), can not judge the sighting target direction as those who are investigated, then those who are investigated can progressively come into sighting target and plant oneself after can just judging the sighting target direction, the examiner rotates sighting target, can not judge that as those who are investigated other directions then allow those who are investigated's sighting target of can suitably reacceesing, can judge all directions of sighting target until those who are investigated.
According to formula
Can determine tested person people's vision, wherein: V is tested person person's a vision, and d is the distance that tested person person's reality can be seen sighting target clearly, and D is the standard testing distance, and V1 is for seeing the standard vision of this sighting target clearly at gauged distance.
Attention: apart from the d value should be the distance of those who are investigated's eye and sighting target, rather than examiner and those who are investigated's distance.
(profile influences each other point of fixation with closing between the sighting target unusually in order to get rid of crowding phenomenon, cause the more single sighting target of ability of differentiating the sighting target that is arranged in rows poor), during d value that the d value of measuring when the front is measured greater than the back side; get back side d value and calculate vision; and should suspect that there is crowding phenomenon in those who are investigated; as above checking eyesight after the suggestion those who are investigated correct defects of vision, get rid of whether have crowding phenomenon really, if still there is the reason of answering the medical check crowding phenomenon to occur.
Claims (6)
1. simple and easy eyesight testing card is characterized in that: be provided with a card (1), the front of card (1) is a white, is provided with a black sighting target (2) in card (1) front center position.
2. simple and easy eyesight testing card according to claim 1 is characterized in that: described sighting target (2) is E word or C word.
3. simple and easy eyesight testing card according to claim 1 is characterized in that: described card (1) is circle or regular polygon.
4. simple and easy eyesight testing card according to claim 1, it is characterized in that: the back side of card (1) is white, be provided with at the back side of card (1) 3～81 the same with positive sighting target size, towards at random black sighting target, the sighting target at the back side layout that is centrosymmetric.
5. simple and easy eyesight testing card according to claim 4 is characterized in that: be provided with 3～25 sighting targets at the back side of card (1).
6. simple and easy eyesight testing card according to claim 4 is characterized in that: the center at card (1) back side is provided with a sighting target with card face towards consistent sighting target.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200321303U CN201157349Y (en) | 2008-03-11 | 2008-03-11 | Simple sight test card |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200321303U CN201157349Y (en) | 2008-03-11 | 2008-03-11 | Simple sight test card |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201157349Y true CN201157349Y (en) | 2008-12-03 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200321303U Expired - Fee Related CN201157349Y (en) | 2008-03-11 | 2008-03-11 | Simple sight test card |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201157349Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2613100A1 (en) * | 2017-03-27 | 2017-05-22 | Universidad Complutense De Madrid | Set and method of assessment of simultaneous vision and eye suppression for people with intellectual disabilities (Machine-translation by Google Translate, not legally binding) |
| CN113807375A (en) * | 2020-06-12 | 2021-12-17 | 海信视像科技股份有限公司 | Display device |
-
2008
- 2008-03-11 CN CNU2008200321303U patent/CN201157349Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2613100A1 (en) * | 2017-03-27 | 2017-05-22 | Universidad Complutense De Madrid | Set and method of assessment of simultaneous vision and eye suppression for people with intellectual disabilities (Machine-translation by Google Translate, not legally binding) |
| CN113807375A (en) * | 2020-06-12 | 2021-12-17 | 海信视像科技股份有限公司 | Display device |
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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: 20081203 Termination date: 20110311 |