CN110346364B - Lensometer and method for measuring torsional degree of lens by lensometer - Google Patents
Lensometer and method for measuring torsional degree of lens by lensometer Download PDFInfo
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Abstract
The invention provides a lensmeter and a method for measuring the torsional degree of a lens by the lensmeter, comprising the following steps: obtaining a light spot image of the lens, dividing the light spot image into N matrix points, respectively calculating the vertex power of each matrix point to obtain the vertex power of the N matrix points, then averaging the vertex powers of the N matrix points to obtain a standard vertex power, comparing the vertex power of the N matrix points with the standard vertex power to obtain the vertex power difference value of the N matrix points, then comparing the top focal power difference of the N matrix points with the standard tolerance to obtain the standard difference of the N matrix points, then selecting M matrix points distributed around the center of the lens from the N matrix points, and the standard difference values of the M matrix points are subjected to difference value weighting operation to obtain the torsion resistance of the lens, so that the abrasion degree of the lens can be judged, and thus, the user can be more intuitively and clearly informed whether the own lens is worn or not and the wear degree.
Description
Technical Field
The invention relates to the technical optical measurement field, in particular to a lensometer and a method for measuring the torsional resistance of a lens by using the lensometer.
Background
A lensmeter is an instrument that projects a light beam emitted from a light source toward a lens to be detected, detects the light quantity distribution of the light transmitted through the lens to be detected by a light detection device, and measures the refractive characteristics of the lens to be detected based on the detection result.
The lensometer is used as a lens-matching measuring instrument to quantitatively measure various parameters of lenses, but the traditional lensmeter can only measure parameters of lenses such as a sphere, a cylindrical lens, a prism and the like, and has no related index for judging and identifying the wear degree of the lenses, so that a user cannot intuitively and clearly learn whether the lenses are worn and the wear degree.
Disclosure of Invention
In view of this, the present invention provides a lensometer and a method for measuring the torsional resistance of a lens thereof, so as to solve the problem that the existing lensometer cannot measure the wear degree, i.e. the torsional resistance of the lens.
In order to achieve the purpose, the invention provides the following technical scheme:
a method for measuring the torsion resistance of a lens by a lensmeter comprises the following steps:
acquiring a light spot image of a lens, dividing the light spot image into N matrix points, and respectively calculating the vertex power of each matrix point to obtain the vertex power of the N matrix points;
averaging the top focal power of the N matrix points to obtain standard top focal power, and comparing the top focal power of the N matrix points with the standard top focal power to obtain the top focal power difference of the N matrix points;
comparing the top focal power difference values of the N matrix points with a standard tolerance to obtain standard difference values of the N matrix points;
selecting M matrix points distributed around the center of the lens from the N matrix points, and performing difference value weighting operation on standard difference values of the M matrix points to obtain a distortion value of the lens;
wherein M, N is a natural number greater than 1.
Optionally, comparing the difference of the top focal power of the N × N matrix points with a standard tolerance to obtain the standard difference of the N × N matrix points, including:
if the top power difference is less than 2% of the standard tolerance, the standard difference is equal to 0;
if the top power difference is higher than 2% of the standard tolerance but equal to 25% of the standard tolerance, the standard difference is equal to 1;
if the top power difference is greater than 25% of the standard tolerance but less than or equal to 50% of the standard tolerance, then the standard difference is equal to 2;
if the top power difference is greater than 50% of the standard tolerance but less than or equal to 75% of the standard tolerance, then the standard difference is equal to 3;
if the top power difference is greater than 75% of the standard tolerance but less than or equal to 100% of the standard tolerance, then the standard difference is equal to 4;
if the top power difference is greater than 100% of the standard tolerance but less than or equal to 125% of the standard tolerance, then the standard difference is equal to 5;
if the power difference is greater than 125% of the standard tolerance but less than or equal to 150% of the standard tolerance, then the standard difference is equal to 6.
Alternatively, N equals 9 and M equals 8.
Optionally, performing a difference weighting operation on the standard deviation values of the 8 matrix points, and obtaining the torsion resistance value of the lens includes:
if the operation result is equal to 8, the twist value is equal to 0;
if the operation result is more than 9 and less than 25, the twist value is equal to 25%;
if the operation result is more than 26 and less than 30, the twist value is equal to 50%;
if the operation result is more than 31 and less than 35, the torsion value is equal to 75 percent;
if the operation result is more than 36 and less than 40, the torsion value is equal to 100%;
if the operation result is more than 41 and less than 45, the torsion value is equal to 125%;
if the operation result is greater than 46, the torsion value is equal to 150%.
A lensmeter, comprising:
the image acquisition unit is used for acquiring a light spot image of the lens;
the vertex power calculation unit is used for dividing the light spot image into N matrix points, and respectively calculating the vertex power of each matrix point to obtain the vertex power of the N matrix points;
the top focal power difference calculation unit is used for averaging the top focal powers of the N x N matrix points to obtain standard top focal power, and comparing the top focal powers of the N x N matrix points with the standard top focal power to obtain top focal power difference values of the N x N matrix points;
the standard difference value calculation unit is used for comparing the top focal power difference values of the N matrix points with a standard tolerance to obtain the standard difference values of the N matrix points;
and the torsion degree calculating unit is used for selecting M matrix points distributed around the center of the lens from the N x N matrix points and carrying out difference value weighting operation on the standard difference values of the M matrix points to obtain the torsion degree of the lens, wherein M, N is a natural number greater than 1.
Optionally, the step of comparing the top power difference of the N × N matrix points with a standard tolerance by the standard difference calculation unit to obtain the standard difference of the N × N matrix points includes:
if the top power difference is less than 2% of the standard tolerance, the standard difference is equal to 0;
if the top power difference is higher than 2% of the standard tolerance but equal to 25% of the standard tolerance, the standard difference is equal to 1;
if the top power difference is greater than 25% of the standard tolerance but less than or equal to 50% of the standard tolerance, then the standard difference is equal to 2;
if the top power difference is greater than 50% of the standard tolerance but less than or equal to 75% of the standard tolerance, then the standard difference is equal to 3;
if the top power difference is greater than 75% of the standard tolerance but less than or equal to 100% of the standard tolerance, then the standard difference is equal to 4;
if the top power difference is greater than 100% of the standard tolerance but less than or equal to 125% of the standard tolerance, then the standard difference is equal to 5;
if the power difference is greater than 125% of the standard tolerance but less than or equal to 150% of the standard tolerance, then the standard difference is equal to 6.
Alternatively, N equals 9 and M equals 8.
Optionally, the performing, by the torsion degree calculating unit, a difference value weighting operation on the standard deviation values of the 8 matrix points, and obtaining the torsion degree value of the lens includes:
if the operation result is equal to 8, the twist value is equal to 0;
if the operation result is more than 9 and less than 25, the twist value is equal to 25%;
if the operation result is more than 26 and less than 30, the twist value is equal to 50%;
if the operation result is more than 31 and less than 35, the torsion value is equal to 75 percent;
if the operation result is more than 36 and less than 40, the torsion value is equal to 100%;
if the operation result is more than 41 and less than 45, the torsion value is equal to 125%;
if the operation result is greater than 46, the torsion value is equal to 150%.
Optionally, the lensmeter includes a display, and the torsion degree calculation unit is further configured to control the display to display a standard deviation value of each matrix point in a torsion degree display area, where the number of pixels in the display area where the standard deviation value is different.
Optionally, the torsion degree calculating unit is further configured to control the display to display the torsion degree value in a torsion degree display area.
Compared with the prior art, the technical scheme provided by the invention has the following advantages:
the lensmeter and the method for measuring the torsional degree of the lens provided by the invention are characterized in that after a facula image of the lens is obtained, the facula image is divided into N matrix points, the vertex power of each matrix point is calculated to obtain the vertex power of the N matrix points, then the vertex power of the N matrix points is averaged to obtain the standard vertex power, the vertex power of the N matrix points is compared with the standard vertex power to obtain the vertex power difference of the N matrix points, then the vertex power difference of the N matrix points is compared with the standard tolerance to obtain the standard difference of the N matrix points, then M matrix points distributed around the center of the lens are selected from the N matrix points, and the standard difference of the M matrix points is subjected to difference weighting operation to obtain the torsional degree of the lens, so that the degree of wear of the lens can be judged, and thus, the user can be more intuitively and clearly informed whether the own lens is worn or not and the wear degree.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a flowchart of a method for measuring the torsional strength of a lens by a lensometer according to an embodiment of the invention;
fig. 2 is a schematic distribution diagram of 9 × 9 matrix points according to an embodiment of the present invention;
fig. 3 is a schematic distribution diagram of 8 matrix points according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a lensmeter according to an embodiment of the present invention;
fig. 5 is a schematic view of a display interface of a torsion resistance according to an embodiment of the present invention;
fig. 6 is a schematic view of another display interface with a twist degree according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, so that the above is the core idea of the present invention, and the above objects, features and advantages of the present invention can be more clearly understood. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention provides a method for measuring the torsion resistance of a lens by a lensmeter, which comprises the following steps of:
s101: acquiring a light spot image of a lens, dividing the light spot image into N matrix points, and respectively calculating the vertex power of each matrix point to obtain the vertex power of the N matrix points;
in the embodiment of the invention, the lensometer comprises a measuring light source, an image acquisition unit, a display, a processing unit, a memory and the like, wherein after the measuring light source emits light and irradiates the lens, the image acquisition unit acquires the light which passes through the lens to obtain a light spot image of the lens and transmits the light spot image to the processing unit, the processing unit divides the light spot image into N matrix points, as shown in figure 2, the light spot image is divided into 9 matrix points, and the vertex power of the N matrix points is calculated by respectively carrying out vertex power on each matrix point to obtain the vertex power of the N matrix points.
S102: averaging the top focal power of the N matrix points to obtain standard top focal power, and comparing the top focal power of the N matrix points with the standard top focal power to obtain the top focal power difference of the N matrix points;
and averaging the calculated top focal power of the N matrix points to obtain a standard top focal power, and comparing the top focal power of each matrix point in the N matrix points with the standard top focal power to obtain the top focal power difference value of the N matrix points. That is, the top focal power of each matrix point in the N × N matrix points is subtracted from the standard top focal power to obtain the top focal power difference of the N × N matrix points.
S103: comparing the top focal power difference values of the N matrix points with a standard tolerance to obtain standard difference values of the N matrix points;
and comparing the top focal power difference values of the N matrix points with the standard tolerance to obtain the standard difference values of the N matrix points. Optionally, the standard tolerance is a GB standard tolerance, i.e. an international standard tolerance.
The comparison and assignment were performed according to the following criteria:
if the top power difference is less than 2% of the standard tolerance, the standard difference is equal to 0;
if the top power difference is higher than 2% of the standard tolerance but equal to 25% of the standard tolerance, the standard difference is equal to 1;
if the top power difference is greater than 25% of the standard tolerance but less than or equal to 50% of the standard tolerance, then the standard difference is equal to 2;
if the top power difference is greater than 50% of the standard tolerance but less than or equal to 75% of the standard tolerance, then the standard difference is equal to 3;
if the top power difference is greater than 75% of the standard tolerance but less than or equal to 100% of the standard tolerance, then the standard difference is equal to 4;
if the top power difference is greater than 100% of the standard tolerance but less than or equal to 125% of the standard tolerance, then the standard difference is equal to 5;
if the power difference is greater than 125% of the standard tolerance but less than or equal to 150% of the standard tolerance, then the standard difference is equal to 6.
That is, if the difference in the vertex power of the matrix points is greater than 2% of the GB standard tolerance but equal to 25% of the GB standard tolerance, the standard difference is 1, if the difference in the vertex power of the matrix points is greater than 25% of the GB standard tolerance but less than or equal to 50% of the GB standard tolerance, the standard difference is 2, and so on.
Wherein the standard tolerances for different types of lenses or lenses with different top powers are different as shown in the following table:
s104: selecting M matrix points distributed around the center of the lens from the N matrix points, and performing weighted operation on standard difference values of the M matrix points to obtain the torsion of the lens;
wherein M, N is a natural number greater than 1. Alternatively, N is equal to 9, and M is equal to 8, which is only used as an example in the embodiments of the present invention, but not limited thereto.
As shown in fig. 3, 8 matrix points distributed around the center of the lens, i.e. 8 matrix points that are thickened in the figure, are selected from 9 × 9 matrix points, and the standard deviation values of the 8 matrix points are subjected to weighting operation, optionally, the degree of torsion is equal to the sum of the standard deviation values of the 8 matrix points, and then the degree of torsion of the lens can be obtained according to the operation result:
if the operation result is equal to 8, the torsion resistance value is equal to 0;
if the operation result is more than 9 and less than 25, the torsion value is equal to 25 percent;
if the operation result is more than 26 and less than 30, the torsion value is equal to 50 percent;
if the operation result is more than 31 and less than 35, the torsion value is equal to 75 percent;
if the operation result is more than 36 and less than 40, the torsion value is equal to 100 percent;
if the operation result is more than 41 and less than 45, the torsion value is equal to 125 percent;
if the operation result is greater than 46, the torsion value is equal to 150%.
The method for measuring the torsion degree of the lens by the lensmeter comprises the steps of obtaining a light spot image of the lens, dividing the light spot image into N matrix points, calculating the vertex power of each matrix point to obtain the vertex power of the N matrix points, averaging the vertex power of the N matrix points to obtain standard vertex power, comparing the vertex power of the N matrix points with the standard vertex power to obtain the vertex power difference value of the N matrix points, comparing the vertex power difference value of the N matrix points with standard tolerance to obtain the standard difference value of the N matrix points, selecting M matrix points distributed around the center of the lens from the N matrix points, performing weighted difference operation on the standard difference value of the M matrix points to obtain the torsion degree of the lens, and further judging the abrasion degree of the lens, and thus, the user can be more intuitively and clearly informed whether the own lens is worn or not and the wear degree.
The embodiment of the present invention further provides a lensmeter, as shown in fig. 4, including an image obtaining unit 10, a top power calculating unit 11, a top power difference calculating unit 12, a standard difference calculating unit 13, and a torsion degree calculating unit 14.
It should be noted that, in the embodiment of the present invention, the lensmeter includes a measurement light source, an image acquisition unit, a display, a processing unit, a memory, and the like, where the processing unit includes a vertex power calculation unit, a vertex power difference calculation unit, a standard difference calculation unit, a torsion degree calculation unit, and the like.
In the embodiment of the present invention, the image obtaining unit 10 is configured to obtain a light spot image of a lens;
the vertex power calculation unit 11 is configured to divide the spot image into N × N matrix points, and perform vertex power calculation on each matrix point to obtain vertex powers of the N × N matrix points;
the vertex power difference calculation unit 12 is configured to calculate a mean value of vertex powers of the N × N matrix points to obtain a standard vertex power, and compare the vertex powers of the N × N matrix points with the standard vertex power to obtain vertex power differences of the N × N matrix points;
a standard deviation value calculation unit 13, configured to compare the vertex power deviation values of the N × N matrix points with a standard tolerance, so as to obtain standard deviation values of the N × N matrix points;
and the torsion degree calculating unit 14 is configured to select M matrix points distributed around the center of the lens from the N × N matrix points, and perform difference weighting operation on the standard differences of the M matrix points to obtain the torsion degree of the lens, where M, N is a natural number greater than 1.
Optionally, the standard deviation value calculating unit 13 compares the top power deviation values of the N × N matrix points with a standard tolerance to obtain the standard deviation values of the N × N matrix points, including:
if the top power difference is less than 2% of the standard tolerance, the standard difference is equal to 0;
if the top power difference is higher than 2% of the standard tolerance but equal to 25% of the standard tolerance, the standard difference is equal to 1;
if the top power difference is greater than 25% of the standard tolerance but less than or equal to 50% of the standard tolerance, then the standard difference is equal to 2;
if the top power difference is greater than 50% of the standard tolerance but less than or equal to 75% of the standard tolerance, then the standard difference is equal to 3;
if the top power difference is greater than 75% of the standard tolerance but less than or equal to 100% of the standard tolerance, then the standard difference is equal to 4;
if the top power difference is greater than 100% of the standard tolerance but less than or equal to 125% of the standard tolerance, then the standard difference is equal to 5;
if the power difference is greater than 125% of the standard tolerance but less than or equal to 150% of the standard tolerance, then the standard difference is equal to 6.
Alternatively, N equals 9 and M equals 8. Of course, the present invention is not limited to this, and in other embodiments, values of N and M may be taken as needed.
Optionally, the step of performing a difference weighting operation on the standard deviation values of the 8 matrix points by the torsion degree calculation unit 14 to obtain the torsion degree value of the lens includes:
if the operation result is equal to 8, the twist value is equal to 0;
if the operation result is more than 9 and less than 25, the twist value is equal to 25%;
if the operation result is more than 26 and less than 30, the twist value is equal to 50%;
if the operation result is more than 31 and less than 35, the torsion value is equal to 75 percent;
if the operation result is more than 36 and less than 40, the torsion value is equal to 100%;
if the operation result is more than 41 and less than 45, the torsion value is equal to 125%;
if the operation result is greater than 46, the torsion value is equal to 150%.
The lensmeter in the embodiment of the present invention includes a display, and the torsion degree calculating unit 14 is further configured to control the display to display a standard deviation value of each matrix point in a torsion degree display area, where the number of pixels in display areas of matrix points is different when the standard deviation value is different.
If the lens is not distorted, the degrees of all positions in the measurement area are the same, and no display mark points appear, wherein the display mark points can be in a circular or square pattern or the like; if the lens has distortion, which indicates that the power (including spherical power and cylindrical power) of the non-lens center position and the lens center position in the measurement area is different, 8 display mark points appear, as shown in fig. 5.
Wherein, the power difference between the position of the 8 display mark points and the central position of the lens is different, the size of the 8 display mark points is different, as shown in fig. 5, the size of the 8 display mark points ● is different; the difference of the degrees of the positions of the 8 display mark points and the center position of the lens is the same, and then the sizes of the 8 display mark points are the same.
Each display mark point has 7 different sizes to show the degree difference between the point position and the lens center position. The correspondence between the sizes of the different display mark points and the standard deviation value a is as follows:
if A is equal to 0, the size of the display mark point is 1 pixel;
if A is equal to 1, the size of the display mark point is 4 pixels;
if A is equal to 2, the size of the display mark point is 8 pixels;
if A is equal to 3, the size of the display mark point is 12 pixels;
if A is equal to 4, the size of the display mark point is 16 pixels;
if A is equal to 5, the size of the display mark point is 20 pixels;
if A is equal to 6, the size of the display mark point is 24 pixels.
Further optionally, the torsion degree calculation unit 14 is further configured to control the display to display the torsion degree value in a torsion degree display area, so that a user can more intuitively and clearly learn whether the own lens is worn and the wear degree.
In the embodiment of the present invention, the distortion value may be displayed in percentage form, such as 25% or 50%, or the area of the region may be used to identify the degree of distortion, as shown in fig. 6, and the ratio of the polygonal area formed by the coordinates of the degrees of distortion of 8 points uniformly distributed in the region in the unit circle to the unit circle is the degree of distortion in the current view, taking the radius of the circle as a unit (100% degree of distortion). Of course, the invention is not limited in this regard and in other embodiments, the degree of twist may be displayed in other ways.
The lensmeter provided by the invention divides the light spot image into N x N matrix points after acquiring the light spot image of the lens, respectively calculating the vertex power of each matrix point to obtain the vertex power of N matrix points, then averaging the vertex powers of the N matrix points to obtain standard vertex power, comparing the vertex power of the N matrix points with the standard vertex power to obtain the vertex power difference value of the N matrix points, then comparing the top focal power difference of the N matrix points with the standard tolerance to obtain the standard difference of the N matrix points, then selecting M matrix points distributed around the center of the lens from the N matrix points, and the standard difference values of the M matrix points are subjected to difference value weighting operation to obtain the torsion resistance of the lens, so that the abrasion degree of the lens can be judged, and thus, the user can be more intuitively and clearly informed whether the own lens is worn or not and the wear degree.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A method for measuring the torsion resistance of a lens by a lensmeter is characterized by comprising the following steps:
acquiring a light spot image of a lens, dividing the light spot image into N matrix points, and respectively calculating the vertex power of each matrix point to obtain the vertex power of the N matrix points;
averaging the top focal power of the N matrix points to obtain standard top focal power, and comparing the top focal power of the N matrix points with the standard top focal power to obtain the top focal power difference of the N matrix points;
comparing the top focal power difference values of the N matrix points with a standard tolerance to obtain standard difference values of the N matrix points;
selecting M matrix points distributed around the center of the lens from the N matrix points, and performing difference value weighting operation on standard difference values of the M matrix points to obtain a distortion value of the lens;
wherein M, N is a natural number greater than 1.
2. The method of claim 1, wherein comparing the top power difference values of the N x N matrix points to a standard tolerance to obtain the standard difference values of the N x N matrix points comprises:
if the top power difference is less than 2% of the standard tolerance, the standard difference is equal to 0;
if the top power difference is higher than 2% of the standard tolerance but equal to 25% of the standard tolerance, the standard difference is equal to 1;
if the top power difference is greater than 25% of the standard tolerance but less than or equal to 50% of the standard tolerance, then the standard difference is equal to 2;
if the top power difference is greater than 50% of the standard tolerance but less than or equal to 75% of the standard tolerance, then the standard difference is equal to 3;
if the top power difference is greater than 75% of the standard tolerance but less than or equal to 100% of the standard tolerance, then the standard difference is equal to 4;
if the top power difference is greater than 100% of the standard tolerance but less than or equal to 125% of the standard tolerance, then the standard difference is equal to 5;
if the power difference is greater than 125% of the standard tolerance but less than or equal to 150% of the standard tolerance, then the standard difference is equal to 6.
3. Method according to claim 1 or 2, characterized in that N is equal to 9 and M is equal to 8.
4. The method of claim 3, wherein performing a difference weighting operation on the standard deviation values of the 8 matrix points to obtain the value of the degree of torsion of the lens comprises:
if the operation result is equal to 8, the twist value is equal to 0;
if the operation result is more than 9 and less than 25, the twist value is equal to 25%;
if the operation result is more than 26 and less than 30, the twist value is equal to 50%;
if the operation result is more than 31 and less than 35, the torsion value is equal to 75 percent;
if the operation result is more than 36 and less than 40, the torsion value is equal to 100%;
if the operation result is more than 41 and less than 45, the torsion value is equal to 125%;
if the operation result is greater than 46, the torsion value is equal to 150%.
5. A lensmeter, comprising:
the image acquisition unit is used for acquiring a light spot image of the lens;
the vertex power calculation unit is used for dividing the light spot image into N matrix points, and respectively calculating the vertex power of each matrix point to obtain the vertex power of the N matrix points;
the top focal power difference calculation unit is used for averaging the top focal powers of the N x N matrix points to obtain standard top focal power, and comparing the top focal powers of the N x N matrix points with the standard top focal power to obtain top focal power difference values of the N x N matrix points;
the standard difference value calculation unit is used for comparing the top focal power difference values of the N matrix points with a standard tolerance to obtain the standard difference values of the N matrix points;
and the torsion degree calculating unit is used for selecting M matrix points distributed around the center of the lens from the N x N matrix points and carrying out difference value weighting operation on the standard difference values of the M matrix points to obtain the torsion degree of the lens, wherein M, N is a natural number greater than 1.
6. The lensmeter of claim 5, wherein the standard deviation calculation unit compares the top power differences for the N x N matrix points to a standard tolerance to obtain the standard deviation for the N x N matrix points, comprising:
if the top power difference is less than 2% of the standard tolerance, the standard difference is equal to 0;
if the top power difference is higher than 2% of the standard tolerance but equal to 25% of the standard tolerance, the standard difference is equal to 1;
if the top power difference is greater than 25% of the standard tolerance but less than or equal to 50% of the standard tolerance, then the standard difference is equal to 2;
if the top power difference is greater than 50% of the standard tolerance but less than or equal to 75% of the standard tolerance, then the standard difference is equal to 3;
if the top power difference is greater than 75% of the standard tolerance but less than or equal to 100% of the standard tolerance, then the standard difference is equal to 4;
if the top power difference is greater than 100% of the standard tolerance but less than or equal to 125% of the standard tolerance, then the standard difference is equal to 5;
if the power difference is greater than 125% of the standard tolerance but less than or equal to 150% of the standard tolerance, then the standard difference is equal to 6.
7. The lensmeter of claim 5 or 6 wherein N is equal to 9 and M is equal to 8.
8. The lensmeter of claim 7, wherein the torsion degree calculating unit performs a difference weighting operation on the standard deviation values of the 8 matrix points, and obtaining the torsion degree value of the lens comprises:
if the operation result is equal to 8, the twist value is equal to 0;
if the operation result is more than 9 and less than 25, the twist value is equal to 25%;
if the operation result is more than 26 and less than 30, the twist value is equal to 50%;
if the operation result is more than 31 and less than 35, the torsion value is equal to 75 percent;
if the operation result is more than 36 and less than 40, the torsion value is equal to 100%;
if the operation result is more than 41 and less than 45, the torsion value is equal to 125%;
if the operation result is greater than 46, the torsion value is equal to 150%.
9. The lensmeter of claim 5, wherein the lensmeter comprises a display, and the twist level calculation unit is further configured to control the display to display a standard deviation value for each matrix point in a twist level display area, wherein the number of pixels in the display area is different for different matrix points.
10. The lensmeter of claim 9, wherein the twist level calculation unit is further configured to control the display to display the twist level value in a twist level display area.
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