CN209172277U - Astigmatic chart that is a kind of readily discernible and using - Google Patents

Abstract

The utility model relates to astigmatic charts that is a kind of readily discernible and using, with the multiple long lines and multiple short-terms of the concyclic heart on carrier, multiple long line and multiple short-terms are uniformly arranged the horizontal top where the center of circle, it is arranged between a short-term or two short-terms between two long lines and a long line is set, the angle between two adjacent long lines is identical as the angle between two adjacent short-terms.In the utility model, the setting of long short-term greatly improves the identification of ordinary consumer, and the setting of mark further improves identification, and central area increases a circular arc, improve visual effect, it only needs the region of substantially semicircle to complete the function of conventional astigmatic table simultaneously, is the high novel astigmatic table of a kind of miniaturization, fining, identification.

Description

Astigmatic chart that is a kind of readily discernible and using

Technical field

The utility model astigmatism table structure improved technologyField, the especially a kind of readily discernible and astigmatic chart that uses.

Background technique

Astigmatism refers to that parallel rays after the refraction of eye refraction system, does not gather for single point, but many scattered Light image, it may also be said to be to make different directions meridian since the curvature of cornea or lens surface different directions is inconsistent Refractive index it is inconsistent, prevent being referred to as by these meridianal external lights from focusing on same focus, such case For astigmatism, astigmatism is divided into two class of regular astigmatism and irregular astigmatism.Astigmatic chart method, crack mirror can be used when astigmatism axial direction optometry Piece method and cross cylinder method, several concentric straight lines are arranged in the first on the carriers such as cardboard, screen, straight by eye-observation Line is deep or light, variation of actual situation judges or calculate astigmatism axial direction；Second is that a piece of crack eyeglass is placed on trial frame, by this Mirror is rotated along each radial line, and until line footpath concentration each on astigmatic chart is consistent, astigmatism axial direction is consistent with crack direction at this time； The third is formed by stacking two cylindrical mirrors that degree is equal, symbol is opposite are axially orthogonal, and cylindrical mirror reciprocating rotary works as eyesight Axle position where the cylindrical mirror rotated when clearest is astigmatism axial direction.The method operation of the first and second is easier, but It is required to using astigmatic chart, existing astigmatic chart is as shown in Figure 2,3, 4, and there are some problems: 1. as shown in Fig. 2, 6 mistake of straight line More, when use, is not easy to observe, and without any mark assisted in identifying, in addition the central area 5 of black is in certain journey The result of observation can be interfered on degree；2. being provided with angle on the outside of each straight line as shown in figure 3, being provided with the straight line 6 of covering hemicycle The mark 7 of degree, but the angle between straight line is larger, has a certain impact for subsequent judgement, calculating；3. as shown in figure 4, straight Line 6 is excessive, and mark 7 is less, the region that covering is entirely justified.

In conclusion the astigmatic chart of above-mentioned Fig. 2,3,4 is there are various problems, the problem of most critical is that identification is poor, smart It spends poor, is not easy to observe.

Utility model content

The purpose of the utility model is to overcome the deficiencies in the prior art, provide that identification is high, area occupied is small and precision High one kind is readily discernible and the astigmatic chart that uses.

The technical scheme adopted by the utility model is that:

Astigmatic chart that is a kind of readily discernible and using, it is characterised in that: more with the concyclic heart on carrier including carrier A long line and multiple short-terms, multiple long line and multiple short-terms are uniformly arranged the horizontal top where the center of circle, two long lines Between be arranged between a short-term or two short-terms a long line be set, angle and two phases between two adjacent long lines Angle between adjacent short-term is identical.

Moreover, the short-term of two horizontal directions is arranged in the two sides in the center of circle, nine are provided in the region above two short-terms A long line and eight short-terms.

Moreover, the long line of two horizontal directions is arranged in the two sides in the center of circle, eight are provided in the region above two long lines A long line and nine short-terms.

Moreover, a white space is arranged in the center point.

Moreover, the angle between the adjacent long line and short-term is 10 degree.

Moreover, the angle between the adjacent long line and short-term is 10 degree.

Moreover, being provided with the mark with the contraposition of long line on carrier on the outside of each long line.

Moreover, being provided with the mark with the contraposition of long line on carrier on the outside of each long line.

Moreover, being provided with the mark with short-term contraposition on carrier on the outside of each short-term.

Moreover, a long line or short-term is respectively set in the two sides where the center of circle below horizontal line, the long line or short-term and horizontal The angle of line is 10 degree and has the mark of contraposition.

The advantages and positive effects of the utility model are as follows:

Multiple long lines for being uniformly arranged in the utility model, on carrier where the center of circle above horizontal line and multiple short Line, the angle between adjacent long line and short-term are 10 degree, and each long line and each short-term all have the mark of contraposition, angle compared with It is small, the identification of astigmatism axial direction can be made to be accurate to 10 degree, and the setting of long short-term mentions the identification of ordinary consumer substantially Height, and the setting identified further improves identification, and central area increases a circular arc, improves vision effect Fruit, while needing the region of substantially semicircle only to complete the function of conventional astigmatic table is a kind of to minimize, refine, distinguishing The high novel astigmatic table of knowledge and magnanimity.

Detailed description of the invention

Fig. 1 is the structural schematic diagram of the utility model；

Fig. 2 is a kind of schematic diagram of the astigmatic chart of prior art；

Fig. 3 is the schematic diagram of the astigmatic chart of another prior art；

Fig. 4 is the schematic diagram of the astigmatic chart of the third prior art.

Specific embodiment

Below with reference to embodiment, the present invention will be further described, and it is not limited that following embodiments, which are illustrative, , the protection scope of the utility model cannot be limited with following embodiments.

Astigmatic chart that is a kind of readily discernible and using, as shown in Figure 1, the innovation of the utility model is: including carrier, With the multiple long lines 1 and multiple short-terms 2 of concyclic heart O on carrier, multiple long line and multiple short-terms are uniformly arranged in center of circle institute In the top of horizontal line (digital 1 corresponding straight line), it is arranged between a short-term or two short-terms between two long lines and is arranged One long line, the angle between two adjacent long lines is identical as the angle between two adjacent short-terms, i.e. β=2 × θ.

In the present embodiment, carrier can be the carrier in kind constituted such as paper, metal plate, plastic plate, can also be by mobile phone The display unit of the electronic products such as screen, computer display screen is as carrier.

As shown in Figure 1, the short-term of two horizontal directions is arranged in the two sides of center of circle O, set in the region above two short-terms It is equipped with nine long lines and eight short-terms.It is of course also possible to which the long line of two horizontal directions, two long lines are arranged in the two sides in the center of circle Eight long lines and nine short-terms are provided in the region of top.

A white space 5 is arranged in the center point can be in the white space of the center point in order to further increase visual effect One circular arc 5 is set with the joint of long line, short-term, is conducive to ordinary consumer and long line, short-term is observed.

Angle β between two adjacent long lines is 20 degree, and the angle theta between adjacent long line and short-term is 10 degree. As shown in Figure 1, being labeled with the number of even number on carrier on the outside of each long line, and surprise is labeled on the carrier on the outside of each short-term Several numbers, these even number numbers and odd number have been differently formed the identification marking 3,4 different to long line, short-term.

A long line or short-term is respectively set in two sides below digital 1 corresponding short-term, the long line or short-term and horizontal line Angle be 10 degree and have contraposition mark.This place is provided with two long lines, and mark is respectively 18 and 2, it is meant that itself and number The corresponding long line of number 18 and 2 above the corresponding short-term of word 1 is on the same line.

The printed words in the center of circle " O " are nonessential mark, and drawing out in figure is for the ease of verbal description.In addition, in Fig. 1 Even number number and odd number can be of different sizes, can also be different with color, such as: even number number is small No. three words, and odd Number number is No. four words.Further more, different types of line style can be used in long line, short-term, and such as: long line can be dotted line, short-term It can be solid line, for another example: long line can be chain-dotted line, and short-term can be dotted line.No matter digital font size, color and line style Variation is to improve identification as principle.

Process when the utility model is used is:

The wire size that long line or short-term is arranged is X, astigmatism axial direction D.

Ordinary consumer covers eyes, observes astigmatism disk, and remembers that thickness, deep or light changed long line or short-term are corresponding Wire size, calculated according to 30 times of rules of astigmatism, specifically:

If wire size X is 1~10 (including 1 and 10), astigmatism axial direction D are as follows: D=90 °-* 10 ° of (X-1)；

If wire size X is 11~18 (including 11 and 18), astigmatism axial direction D are as follows: D=270 °-* 10 ° of (X-1).

Such as: 7 direction of wire size is seen than more visible, black, astigmatism axial direction D is 90 °-(7-1) × 10 °=30 °, for another example: 15 direction of wire size is seen than more visible, black, astigmatism axial direction D is 270 °-(15-1) × 10 °=130 °.

The number that above-mentioned long line, short-term mark can be any, for example mark English alphabet, Roman character are also possible, But need to convert for from the right by the number counted counterclockwise.In addition, 1/5th or more of the length of short-term greater than long line are It can be with that is, long line, the length of short-term are unlimited, and short-term is not too short and more shorter than long line, as long as the length between long line and short-term Degree difference is more apparent.

Multiple long lines for being uniformly arranged in the utility model, on carrier where the center of circle above horizontal line and multiple short Line, the angle between adjacent long line and short-term are 10 degree, and each long line and each short-term all have the mark of contraposition, angle compared with It is small, the identification of astigmatism axial direction can be made to be accurate to 10 degree, thus provide more accurate initial value for the calculating of software algorithm, The setting for keeping calculated result more accurate, and the setting of long short-term greatly improves the identification of ordinary consumer, and identifying Identification is further improved, and central area increases a circular arc, improves visual effect, while only needing substantially half Round region can complete the function of conventional astigmatic table, be a kind of miniaturization, fining, the high novel astigmatic table of identification.

Claims (10)

1. astigmatic chart that is a kind of readily discernible and using, it is characterised in that: multiple with the concyclic heart on carrier including carrier Long line and multiple short-terms, multiple long line and multiple short-terms are uniformly arranged the horizontal top where the center of circle, two long lines it Between be arranged between a short-term or two short-terms a long line be set, the angle between two adjacent long lines is adjacent with two Short-term between angle it is identical.

2. one kind according to claim 1 is readily discernible and the astigmatic chart that uses, it is characterised in that: set in the two sides in the center of circle The short-term of two horizontal directions is set, nine long lines and eight short-terms are provided in the region above two short-terms.

3. one kind according to claim 1 is readily discernible and the astigmatic chart that uses, it is characterised in that: set in the two sides in the center of circle The long line of two horizontal directions is set, eight long lines and nine short-terms are provided in the region above two long lines.

4. one kind according to claim 1 or 2 or 3 is readily discernible and the astigmatic chart that uses, it is characterised in that: the center of circle One white space of place's setting.

5. one kind according to claim 1 or 2 or 3 is readily discernible and the astigmatic chart that uses, it is characterised in that: described adjacent Long line and short-term between angle be 10 degree.

6. one kind according to claim 4 is readily discernible and the astigmatic chart that uses, it is characterised in that: the adjacent long line Angle between short-term is 10 degree.

7. one kind according to claim 5 is readily discernible and the astigmatic chart that uses, it is characterised in that: on the outside of each long line The mark with the contraposition of long line is provided on carrier.

8. one kind according to claim 6 is readily discernible and the astigmatic chart that uses, it is characterised in that: on the outside of each long line The mark with the contraposition of long line is provided on carrier.

9. one kind according to claim 7 or 8 is readily discernible and the astigmatic chart that uses, it is characterised in that: outside each short-term The mark with short-term contraposition is provided on the carrier of side.

10. one kind according to claim 9 is readily discernible and the astigmatic chart that uses, it is characterised in that: horizontal where the center of circle A long line or short-term is respectively set in two sides below line, and the long line or short-term and horizontal angle are 10 degree and have contraposition Mark.