CN115903262A - Lightweight customization method and device for glasses - Google Patents
Lightweight customization method and device for glasses Download PDFInfo
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- CN115903262A CN115903262A CN202211115492.XA CN202211115492A CN115903262A CN 115903262 A CN115903262 A CN 115903262A CN 202211115492 A CN202211115492 A CN 202211115492A CN 115903262 A CN115903262 A CN 115903262A
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- 239000011521 glass Substances 0.000 title claims abstract description 33
- 238000005457 optimization Methods 0.000 claims abstract description 35
- 238000013461 design Methods 0.000 claims abstract description 33
- 238000005259 measurement Methods 0.000 claims abstract description 32
- 238000009826 distribution Methods 0.000 claims description 16
- 210000001747 pupil Anatomy 0.000 claims description 16
- 201000009310 astigmatism Diseases 0.000 claims description 14
- 238000007688 edging Methods 0.000 claims description 13
- 238000005520 cutting process Methods 0.000 claims description 11
- 238000004364 calculation method Methods 0.000 claims description 7
- 239000000126 substance Substances 0.000 claims description 3
- 230000001179 pupillary effect Effects 0.000 claims description 2
- 239000013585 weight reducing agent Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 4
- 238000005452 bending Methods 0.000 abstract 1
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- 230000004330 high hyperopia Effects 0.000 description 2
- 208000010073 high hyperopia Diseases 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 201000009487 Amblyopia Diseases 0.000 description 1
- 238000012897 Levenberg–Marquardt algorithm Methods 0.000 description 1
- 208000029091 Refraction disease Diseases 0.000 description 1
- 230000004430 ametropia Effects 0.000 description 1
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Abstract
The invention discloses a method and a device for customizing lightweight glasses, which are characterized in that the minimum diameter is calculated according to measurement data of a user wearing a glasses frame and parameters of the glasses frame, and the lens to be customized is subjected to large-curve design and aspheric optimization, so that the central area and the edge area of the lens to be customized are optimized, and then a lens customization scheme is generated according to the optimized parameters. By adopting the embodiment of the invention, in the design scheme of customizing the lenses, the large-bending design and the aspheric surface optimization design are combined at the same time, so that the light weight of glasses customization is realized. In addition, the thickness of the customized lens is considered, meanwhile, the large-curve design and the aspheric surface design of the lens are also considered, the most appropriate lightweight customization scheme is provided after the three parameters are integrated, on one hand, the lightweight effect is improved, and on the other hand, the practicability of the customized lens is ensured.
Description
Technical Field
The invention relates to the technical field of glasses, in particular to a method and a device for lightweight customization of glasses.
Background
High hyperopia is the most common ametropia of preschool children and is also an important reason causing amblyopia of children, and the wearing of frame glasses is the main scheme for correcting the high hyperopia of children. Generally, the higher the distance vision power, the thicker the spectacle lens, and the thicker and heavier the lens of the high distance vision spectacles, which is not beautiful and inconvenient to use. Children are sexually active, and after wearing the glasses, the glasses often slip downwards due to the weight, or the optical center of the glasses is inconsistent with the pupil, so that the vision correction effect is influenced; or cause the glasses to fall and be damaged; the overweight of part of the glasses often causes the compression of the nose bridge and even influences the development.
The conventional method of spectacle customization currently on the market is to utilize conventional stock spectacle lenses for personalized customization. First, the vision parameters of the customer are measured by a measuring tool, whereby the corresponding stock ophthalmic lenses are matched. These ophthalmic lenses are pre-manufactured with a certain gauge of diameter. After the inventory of the spectacle lenses is matched, the spectacle lenses are cut and edged according to the shape of the spectacle frame selected by a customer, so that the spectacle lenses are matched with the spectacle frame, and then the spectacle lenses are installed on the spectacle frame, thus finishing the manufacture of the customized spectacles.
It can be seen that the conventional glasses are customized without considering the weight of the glasses, and according to the optical principle, the smaller the diameter of the lens is, the thinner the center thickness of the lens is, and the lighter the processed glasses lens is, under the condition that the thicknesses of the edges of the lens are consistent. However, customized lenses are not simply sought to be as small as possible, but rather are designed to simultaneously meet the requirement that the optical center response of the cut and edged lens, when fitted into a frame, is as close as possible to the geometric center and centered in the pupil. The existing automatic customization does not provide a relevant solution on how to perfectly balance parameters such as the interpupillary distance, the pupil height, the transverse diameter and the vertical height of the spectacle frame, the reservation of the processing cut edge and the like.
Disclosure of Invention
The embodiment of the invention provides a light-weight customization method and device for glasses.
The embodiment of the invention provides a lightweight customization method for glasses, which comprises the following steps:
the method comprises the steps of obtaining measurement parameters of a user wearing a first spectacle frame and spectacle frame parameters corresponding to the first spectacle frame;
calculating the minimum diameter of the spectacle lens to be determined according to the measurement parameters and the spectacle frame parameters;
acquiring diopter of the user, performing large-curve design on the spectacle lens to be customized according to the diopter and the minimum diameter, and determining front and back surface curvatures of the spectacle lens to be customized at the minimum weight;
according to the front surface curvature and the rear surface curvature, performing aspheric optimization on the spectacle lens to be customized, and optimizing the edge area of the spectacle lens to be customized;
and generating a spectacle lens customization scheme corresponding to the first spectacle frame according to the front and back surface curvatures and the related optimization parameters of the edge area.
Further, the step of calculating the minimum diameter of the spectacle lens to be determined according to the measurement parameters and the parameters of the spectacle frame specifically comprises:
the measurement parameters include: pupil distance and pupil height; the frame parameters include: the maximum horizontal width, the maximum vertical height, the geometric center distance of a left spectacle frame and a right spectacle frame and the minimum cutting edging amount of the spectacle frame;
judging whether the interpupillary distance meets a first preset requirement or not;
if so, the minimum diameter of the spectacle lens to be manufactured = the maximum frame diameter of the spectacle frame + (the geometric center distance-the interpupillary distance of the left and right spectacle frames) + the minimum cutting edging amount; wherein the maximum frame diameter of the spectacle frame takes a larger value of the maximum horizontal width and the maximum vertical height;
if not, the minimum diameter = the distance from the pupil center position to the farthest end of the spectacle frame multiplied by 2+ minimum cutting edging amount of the spectacle lens to be manufactured.
Further, according to the diopter and the minimum diameter, performing a large curve design on the spectacle lens to be customized, and determining the front and back surface curvatures of the spectacle lens to be customized at the minimum weight, specifically:
designing a large bend according to the following formula:
wherein V is the lens volume; d lens Is the diopter; n is the refractive index of the lens; t is the central thickness of the lens; r is 1 Front surface curvature; r is 2 Is the posterior surface curvature; r is half of the diameter of the preset lens;
and (3) deriving the lens volume, and determining the front and back surface curvature collocation of the spectacle lens to be customized under the minimum volume so as to determine the front and back surface curvatures of the spectacle lens to be customized under the minimum weight.
Further, the step of performing aspheric optimization on the spectacle lens to be customized according to the front and rear surface curvatures to optimize the edge area of the spectacle lens to be customized specifically comprises the steps of:
according to the curvature of the rear surface, combining a preset even-order aspheric high-order term to construct rise surface type distribution, which is specifically as follows:
wherein, the first and the second end of the pipe are connected with each other,
is in a rise surface type distribution; x is the distance from any point on the rear surface to the center of the circle; k is a conic coefficient, A, B, C, D, E is an even order aspheric higher order term;
calculating astigmatism of the spectacle lens to be customized in the edge area according to the sagittal height surface type distribution;
adjusting and optimizing the even order aspheric higher order term to make astigmatism of the edge area zero, thereby optimizing the edge area of the spectacle lens to be customized.
Further, before the calculating the minimum diameter of the spectacle lens to be manufactured according to the measurement parameters and the frame parameters, the method further comprises the following steps:
judging whether the user is suitable for the first spectacle frame or not according to the measurement parameters and the spectacle frame parameters;
if the user is determined not to be suitable, feeding back reselection information to the user so that the user can reselect and select the spectacle frame;
if the determination is appropriate, calculating the minimum diameter of the spectacle lens to be determined according to the measurement parameters and the parameters of the spectacle frame.
Further, the determining, according to the measurement parameter and the frame parameter, whether the user is suitable for the first spectacle frame specifically includes:
the measurement parameters comprise the interpupillary distance and the pupil height; the frame parameters include: the maximum vertical height of the spectacle frame and the distance between the geometric centers of the left spectacle frame and the right spectacle frame;
if (the distance between the geometric centers of the left and right spectacle frames and the pupillary distance)/2 is larger than 2.5mm or (the height of the pupils and the maximum vertical height of the spectacle frames/2) is larger than 2mm, determining that the user is not suitable for the first spectacle frame;
otherwise, determining that the user fits the first eyeglass frame.
Correspondingly, the embodiment of the invention also provides a recommendation method of the lightweight customization scheme of the glasses, which comprises the following steps:
the pupil distance and the diopter of a user are obtained, all spectacle frames in inventory are customized by combining the lightweight spectacle customization method, and a plurality of spectacle lens customization schemes are generated;
generating a weight gradient list of a full-inventory spectacle frame according to the weight of each spectacle lens customization scheme and the weight of the spectacle frame;
recommending the weight gradient list to a user so that the user can screen out the corresponding spectacle frame and spectacle lens customization scheme from the weight gradient list.
Correspondingly, the embodiment of the invention also provides a glasses lightweight customization device, which comprises: the device comprises an acquisition module, a calculation module, a large bend design module, an aspheric optimization module and a generation module;
the acquisition module is used for acquiring measurement parameters of a user wearing a first spectacle frame and spectacle frame parameters corresponding to the first spectacle frame;
the calculation module is used for calculating the minimum diameter of the spectacle lens to be determined according to the measurement parameters and the spectacle frame parameters;
the large curve design module is used for obtaining diopter of the user, performing large curve design on the spectacle lens to be customized according to the diopter and the minimum diameter, and determining front and back surface curvatures of the spectacle lens to be customized at the minimum weight;
the aspheric optimization module is used for carrying out aspheric optimization on the spectacle lens to be customized according to the front and back surface curvatures and optimizing the edge area of the spectacle lens to be customized;
the generation module is used for generating an eyeglass customization scheme corresponding to the first eyeglass frame according to the front and back surface curvatures and the related optimization parameters of the edge area.
Correspondingly, the embodiment of the invention also provides a system for recommending the lightweight customized scheme of the glasses, which comprises the following steps: the system comprises a user data acquisition module, a list generation module, a recommendation module and a light weight customization device of the glasses, wherein the user data acquisition module is used for acquiring a list of the glasses;
the user data acquisition module is used for acquiring the interpupillary distance and diopter of a user;
the glasses lightweight customizing device is used for customizing all spectacle frames in inventory according to the interpupillary distance and diopter of the user to generate a plurality of glasses customizing schemes;
the list generation module is used for generating a weight gradient list of a full-inventory spectacle frame according to the weight of each spectacle lens customization scheme and the weight of a spectacle frame;
the recommending module is used for recommending the weight gradient list to a user so that the user can screen out corresponding spectacle frame and spectacle lens customization schemes from the weight gradient list.
From the above, the embodiment of the invention provides a method and a device for lightweight spectacle lens customization, which are characterized in that the minimum diameter is calculated according to the measurement data of a user wearing a spectacle frame and the parameters of the spectacle frame, the maximum curve design and the aspheric optimization are carried out on the spectacle lens to be customized, so that the central area and the edge area of the spectacle lens to be customized are optimized, and then the spectacle lens customization scheme is generated according to the optimized parameters. Compared with the prior art that selection is only carried out according to inventory spectacle lenses and light weight of the spectacle lenses is not considered, the embodiment of the invention simultaneously combines large-curve design and aspheric surface optimization design in the design scheme of customized spectacle lenses to realize light weight of spectacle customization. In addition, the thickness of the customized lens is considered, meanwhile, the large-curve design and the aspheric surface design of the lens are also considered, the most appropriate lightweight customization scheme is provided after the three parameters are integrated, on one hand, the lightweight effect is improved, and on the other hand, the practicability of the customized lens is ensured.
Drawings
FIG. 1 is a schematic flow diagram of one embodiment of a method for lightweight eyewear customization provided by the present invention;
FIG. 2 is a schematic diagram of one embodiment of a rise distribution provided by the present invention;
FIG. 3 is a schematic flowchart of an embodiment of a method for recommending a lightweight customized eyewear solution according to the present invention;
FIG. 4 is a schematic diagram of one embodiment of a customization scheme provided by the present invention;
FIG. 5 is a schematic structural view of an embodiment of a lightweight eyeglass customization device provided in the present invention;
fig. 6 is a schematic structural diagram of an embodiment of a system for recommending a lightweight customized eyewear solution according to 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, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
Referring to fig. 1, fig. 1 is a schematic flow chart of an embodiment of a method for customizing lightweight glasses according to the present invention. As shown in fig. 1, the method includes steps 101 to 105, and each step is as follows:
step 101: the method comprises the steps of obtaining measurement parameters of a user wearing a first spectacle frame and spectacle frame parameters corresponding to the first spectacle frame.
In this embodiment, before customizing, the user often needs to give his/her own eye data, such as pupil distance and pupil height, which may be different due to different styles of spectacle frames. Therefore, the user needs to measure after selecting the spectacle frame, and the specific measuring method is the prior art and is not described herein again.
In this embodiment, the frame parameters of the spectacle frame may be, but are not limited to, collected in advance by using an automatic scanning device and stored in a database, so as to form a frame parameter database of all spectacle frames in a store, and the frame parameters may be directly called when needed without field collection. Frame parameters may include, but are not limited to: the maximum horizontal width, the maximum vertical height, the geometric center distance of the left and the right spectacle frames and the minimum cutting edging amount of the spectacle frame.
In the present embodiment, the minimum cutting edging amount is a necessary space reserved for cutting edging in accordance with the shape of the eyeglass frame in order to enable the custom lens to be mounted in the eyeglass frame. The minimum cut edging amount may be, but is not limited to, 1-2mm.
Step 102: and calculating the minimum diameter of the spectacle lens to be determined according to the measurement parameters and the parameters of the spectacle frame.
In this embodiment, step 102 specifically includes: judging whether the interpupillary distance meets a first preset requirement or not;
if yes, go to step 1021, otherwise go to step 1022.
Step 1021: the minimum diameter of the spectacle lens to be determined = the maximum frame diameter of the spectacle frame + (the distance between the geometric centers of the left and right spectacle frames-the interpupillary distance) + the minimum cutting edging amount; and the maximum frame diameter of the spectacle frame takes the larger value of the maximum horizontal width and the maximum vertical height, namely when the maximum horizontal width is larger than the maximum vertical height, the maximum frame diameter of the spectacle frame is equal to the maximum horizontal width, and when the maximum horizontal width is smaller than the maximum vertical height, the maximum frame diameter of the spectacle frame is equal to the maximum vertical height.
Step 1022: the minimum diameter = pupil center position to spectacle-frame farthest end distance x 2+ minimum cutting edging amount of spectacle lens to be made.
In this embodiment, the first preset requirement is used to determine whether the interpupillary distance is a special case, for example, it may be set whether (the distance between the geometric centers of the left and right frames-the interpupillary distance)/2 is greater than 2.5mm, if yes, it is determined as the special interpupillary distance, step 1022 is executed, if not, it is determined as the normal interpupillary distance, and step 1021 is executed.
Step 103: and acquiring the diopter of a user, performing large-curve design on the spectacle lens to be customized according to the diopter and the minimum diameter, and determining the front and back surface curvatures of the spectacle lens to be customized when the spectacle lens to be customized is at the minimum weight.
In this embodiment, step 103 specifically includes:
designing a large bend according to the following formula:
wherein V is the lens volume; d lens Is the diopter; n is the refractive index of the lens; t is the central thickness of the lens; r 1 Front surface curvature; r 2 Is the posterior surface curvature; r is half of the diameter of the preset lens;
and (3) deriving the lens volume, and determining the front and back surface curvature collocation of the spectacle lens to be customized under the minimum volume so as to determine the front and back surface curvatures of the spectacle lens to be customized under the minimum weight.
In this embodiment, diopter D of the user lens And the lens center thickness t are predetermined, diopters can be obtained by measuring the user's eye. The central thickness of the lens can be determined by the spectacle lenses in stock, or a fixed value can be preset, or corresponding thickness values can be configured for different spectacle frames.
In this embodiment, the lens consists of front and back surfaces, and the central thickness and the edge thickness are always controlled to be positive values to ensure that the physical meaning of the volume is effective. Referring to fig. 2, fig. 2 is a schematic diagram of one embodiment of the rise distribution provided by the present invention. As shown in FIG. 1, the single fan rise distribution formula is:
diopter
Front surface finish
Rear surface luminosity->
The rise distribution formula of any point of the Front surface (Front) is as follows:
the rise distribution formula of any point of the Back surface (Back) is as follows:
volume of mirror
The above formula is combined to obtain the calculation formula of step 103, and after obtaining the above expression, the curvature collocation of the front and back surfaces at the minimum volume (i.e. the lightest weight) is obtained by deriving the volume.
Step 104: and performing aspheric optimization on the spectacle lens to be customized according to the front and back surface curvatures, and optimizing the edge area of the spectacle lens to be customized.
In the present embodiment, after determining the front and rear surface curvatures, astigmatism is generated in the edge area due to the difference between the central area and the edge area. In order to optimize astigmatism, step 104 specifically includes:
according to the curvature of the rear surface, combining a preset even-order aspheric high-order term to construct rise surface type distribution, which is specifically as follows:
wherein the content of the first and second substances,
the distribution is a non-spherical sagittal high surface distribution of the back surface; x is the distance from any point on the rear surface to the center of the circle; k is a conic coefficient, A, B, C, D, E is an even order aspheric higher order term;
calculating astigmatism of the spectacle lens to be customized in the edge area according to the sagittal height surface type distribution;
adjusting and optimizing the even order aspheric higher order term to make astigmatism of the edge area zero, thereby optimizing the edge area of the spectacle lens to be customized.
In this embodiment, the rise of the front and back surfaces at different positions represents the combination of the curvature radii of the front and back surfaces at the position, and different combinations have different powers, that is, the central area is matched with the diopter of the user, but the edge areas are not matched, even aspheric high-order terms of the rise, namely k, B, C, D, E, need to be optimized to optimize the powers of the edge areas, and these wrong powers are astigmatism. In order to ensure the accuracy of the machined off-ball detection, the value of a is generally set to 0 by default.
The optimized direction is to eliminate oblique astigmatism and control distortion, and the expression is as follows:
seidel astigmatism equation:
seidel Fang Jibian route:
wherein the content of the first and second substances,
p is normalized caliber for normalized image height>
The included angle of the polar coordinates of the light rays with different angles falling in the visual field.
First, an evaluation function is defined
Wherein W i Is the weight absolute value (i.e. optimized side weight ratio), m is the total number of optimized aberrations, e i Initial value, t, before optimization i For the optimized target value, each in the evaluation functionThe independent aberration equation is f 1 ＝ i ( i I), in order to ensure the full-field imaging of the lens to be clear, the normalized angles of the oblique astigmatism in the field of view of 30 degrees are respectively: 0.3, 0.5, 0.7071, 0.85 and 1 field, with the oblique astigmatic aberration equations:
in addition, distortion does not affect sharpness and thus can reduce its weight fraction in total aberrations, i.e., W 6 The value is reduced;
Distortion＝f dist ＝W 6 (e 6 -t 6 )
the overall merit function can be written as:
MF＝[W 1 (e 1 -t 1 )] 2 +[W 2 (e 2 -t 2 )] 2 +[W 3 (e 3 -t 3 )] 2 +[W 4 (e 4 -t 4 )] 2 +[W 5 (e 5 -t 5 )] 2 +[W 6 (e 6 -t 6 )] 2
the 6 sub-evaluation functions are related to the even-order aspheric coefficients of the back surface, namely k, B, C, D and E, which are variables of the equation, and MF is the even-order aspheric coefficient functions of k, B, C, D, E and the like. According to the optimization requirements (eliminating oblique dispersion and ensuring minimum distortion), the weight distribution of astigmatism correlation in the evaluation function is 1, the distortion weight is 0.25, and each target value t i Are all equal to 0, the requirement is that the MF iteration converges around 0.
Iterative solution of k, B, C, D and E by adopting a damped least square method is carried out, and the initial value vectors of k, B, C, D and E before optimization are assumed to be expressed as
x 0 ＝(x 100 ,x 200 ,x 300 ,x 400 ,x 500 ；[x abc Subscript logic, a corresponds to variable, bc is the number of optimization runs])
Corresponding to an initial value of the evaluation function of e 100 ，e 200 ，e 300 ，e 400 ，e 500 ，
Let the initial aberration equation set as
f 0 ＝(f 101 ，f 201 ，f 301 ，f 401 ，f 501 ；[f abc Subscript logic, a corresponds to variable, bc is the number of optimization runs])
X and f after the first optimization are as follows:
x 1 ＝(x 101 ，x 201 ，x 301 ，x 401 ，x 501 )
f 1 ＝(f 101 ，f 201 ，f 301 ，f 401 ，f 501 )
meanwhile, let X = X 1 -x 0 Then, the value of the variable X is solved by adopting a least square method, namely:
X＝(A T A+P[I]) -1 A T f 0
wherein A is a 5x5 matrix, partial derivative
A T Obtaining a transposed matrix for A, P is a damping factor, I is an identity matrix, pair (A) T A+P[I]) -1 Is (A) T A+P[I]) Inversion is carried out, algebraic operation is carried out on the matrix once, X values obtained through first optimization can be obtained, and X = X is obtained 1 -x 0 Obtaining x 1 To thereby determine x 1 Corresponding to k 01 、B 01 、C 01 、D 01 、E 01 The optimized even aspheric surface can be optimized next time to obtain an initial structure, and the optimal solution can be obtained by repeating iterative solution by using a damping least square method.
The present embodiment optimizes the edge zone of the customized lens by adjusting and optimizing the even aspheric higher order term to make astigmatism zero.
Step 105: and generating a spectacle lens customization scheme corresponding to the first spectacle frame according to the front and back surface curvatures and the related optimization parameters of the edge area.
In this embodiment, after calculation and optimization, the related optimization parameters are recorded, and an eyeglass lens customization scheme corresponding to the first eyeglass frame is generated. The ophthalmic lens customization protocol may, but is not limited to, record: the method is characterized in that core elements such as the diameter, the optical center and the front and back surface curvatures of the customized lens can be customized, other elements such as weight, material and refractive index can be recorded, and the customized lens can be specifically set according to the requirements of users.
As an example of this embodiment, before step 102, the method further includes:
judging whether the user is suitable for the first spectacle frame or not according to the measurement parameters and the spectacle frame parameters; if the user does not select the spectacle frame, feeding back reselection information to the user for the user to reselect the spectacle frame; if the determination is appropriate, calculating the minimum diameter of the spectacle lens to be determined according to the measurement parameters and the parameters of the spectacle frame.
In this example, according to the measurement parameter and the frame parameter, it is determined whether the user is suitable for the first eyeglass frame, specifically: if (distance between geometric centers of left and right spectacle frames-interpupillary distance)/2 > 2.5mm, or (height of pupil-maximum vertical height of spectacle frame/2) > 2mm, determining that the user is not suitable for the first spectacle frame; otherwise, determining that the user fits the first eyeglass frame.
In this example, before customizing the spectacle lens, the primary judgment is carried out through the interpupillary distance and the pupil height, if the spectacle frame is not matched, the user is directly informed to reselect the spectacle frame, and if the spectacle frame is matched, the step 102 is executed, so that the effectiveness and the practicability of the customization are improved.
Correspondingly, the embodiment of the invention also provides a recommendation method of the glasses light weight customization scheme, and the recommendation method is shown in fig. 3. As shown in fig. 3, steps 301 to 303 of the recommendation method specifically include the following steps:
step 301: the pupil distance and the diopter of a user are obtained, all spectacle frames in the inventory are customized by combining the lightweight spectacle customization method, and a plurality of spectacle lens customization schemes are generated.
Step 302: a weight gradient list of a fully stocked spectacle frame is generated from the weight of each spectacle lens customization solution in combination with the weight of the spectacle frame.
Step 303: recommending the weight gradient list to a user so that the user can screen out the corresponding spectacle frame and spectacle lens customization scheme from the weight gradient list.
In the embodiment, the gradient list with weight as the priority is generated by fully customizing the inventory spectacle frames, so that the user can conveniently select the lightest spectacle frame. The invention can simply and conveniently compare and select different spectacle frames, lenses with different refractive indexes, lenses with different materials, an optimal customized lens scheme and the real weight of the processed spectacles; through repeated weighted comparison, the most preferable weight-reducing customized eyeglass design scheme can be obtained simply and conveniently on the basis of considering aesthetics. Compared with the conventional lens selecting mode, the weight of the lens can be reduced by 30-70% by using the scheme of the invention.
To better explain the principles of embodiments of the present invention, the following examples are presented. The lens degrees of the glasses fitting of both eyes of the customer are both +5.00D, the pupil distance is 54mm, and the customer executes the customization method after selecting the glasses frame by self or by a system.
1. After a customer selects or a system automatically selects a pair of spectacle frames, corresponding parameters are obtained: the maximum vertical height of the spectacle frame is 30mm, the maximum horizontal width is 42mm, and the geometric center distance of the left spectacle frame and the right spectacle frame is 54mm;
2. a customer wears the spectacle frame and measures the height of an acquisition pupil by 15mm;
3. and (3) calculating: (geometric center distance-interpupillary distance of the left and right spectacle frames)/2=0, (pupil height-vertical height of spectacle frame/2) =0, and the spectacle frame is determined to meet the spectacle dispensing condition;
4. the minimum diameter calculated to obtain a customized ophthalmic lens is: 42mm (taking the maximum horizontal width value of the spectacle frame) +0 (the distance between the geometric centers of the left and right spectacle frames-the interpupillary distance) +1mm (reserved for edging processing) =43mm;
5. optimizing and adjusting the large-curve design of the customized lens, substituting the preset diameter of 43mm and the diopter of a customer +5.00D of the customized lens into the formula in the step 103, and calculating the front and back surface curvatures of the customized spectacle lens with the minimum weight as follows: 92mm and 398mm;
6. substituting the front and back surface curvatures into the formula of step 104, and performing aspheric processing to further obtain parameters of the customized lens;
7. the parameters of the final customized lens are as shown in fig. 4, and the processed lens weight is 2.739g;
8. according to the refractive index of the lens being 1.6, the diameter of the conventional stock sheet is 65, and the weight of the processed lens is 10.857g, compared with the technical scheme of the invention, the weight of the customized lens is reduced by 75%.
Accordingly, referring to fig. 5, fig. 5 is a schematic structural diagram of an embodiment of the eyeglass light weight customization apparatus provided by the present invention, as shown in fig. 5, the apparatus includes: the system comprises an acquisition module 501, a calculation module 502, a large bend design module 503, an aspheric optimization module 504 and a generation module 505.
The obtaining module 501 is configured to obtain a measurement parameter when a user wears a first spectacle frame and a spectacle frame parameter corresponding to the first spectacle frame;
the calculating module 502 is configured to calculate a minimum diameter of the spectacle lens to be determined according to the measurement parameter and the frame parameter;
the large curve design module 503 is configured to obtain diopter of the user, perform large curve design on the spectacle lens to be customized according to the diopter and the minimum diameter, and determine front and back surface curvatures of the spectacle lens to be customized at a minimum weight;
the aspheric optimization module 504 is configured to perform aspheric optimization on the spectacle lens to be customized according to the front and rear surface curvatures, and optimize an edge area of the spectacle lens to be customized;
the generating module 505 is configured to generate an eyeglass lens customization scheme corresponding to the first eyeglass frame according to the front and back surface curvatures and the related optimization parameters of the edge regions.
The more detailed working principle and the step flow of the present device can be, but are not limited to, the related descriptions above.
Accordingly, referring to fig. 6, fig. 6 is a schematic structural diagram of an embodiment of the eyeglass light-weight customization scheme recommendation system provided by the present invention. As shown in fig. 6, the system includes: a user data obtaining module 601, a list generating module 603, a recommending module 604, and an eyeglass lightweight customizing device 604 according to an embodiment of the present invention.
The user data acquisition module 601 is configured to acquire the interpupillary distance and the diopter of a user;
the eyeglass lightweight customization device 602 is configured to customize all eyeglass frames in inventory according to the interpupillary distance and diopter of the user, so as to generate a plurality of eyeglass customization schemes;
the list generating module 603 is configured to generate a weight gradient list of a fully-stocked spectacle frame according to the weight of each spectacle lens customization scheme and in combination with the weight of the spectacle frame;
the recommending module 604 is configured to recommend the weight gradient list to the user, so that the user can select a corresponding spectacle frame and spectacle lens customization scheme from the weight gradient list.
Therefore, the embodiment of the invention provides a method and a device for lightweight spectacle customization, which are used for calculating the minimum diameter according to the measurement data of a user wearing a spectacle frame and parameters of the spectacle frame, performing macrobending design and aspheric optimization on a lens to be customized so as to optimize the central area and the edge area of the lens to be customized, and generating a spectacle lens customization scheme according to the optimized parameters. Compared with the prior art that selection is only carried out according to inventory spectacle lenses and light weight of the spectacle lenses is not considered, the embodiment of the invention simultaneously combines large-curve design and aspheric surface optimization design in the design scheme of customized spectacle lenses to realize light weight of spectacle customization. In addition, the thickness of the customized lens is considered, meanwhile, the large-curve design and the aspheric surface design of the lens are also considered, the most appropriate lightweight customization scheme is given after three parameters are integrated, on one hand, the lightweight effect is improved, and on the other hand, the practicability of the customized lens is ensured.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (9)
1. An eyeglass light weight customization method, comprising:
the method comprises the steps of obtaining measurement parameters of a user wearing a first spectacle frame and spectacle frame parameters corresponding to the first spectacle frame;
calculating the minimum diameter of the spectacle lens to be determined according to the measurement parameters and the parameters of the spectacle frame;
acquiring diopter of the user, performing large-curve design on the spectacle lens to be customized according to the diopter and the minimum diameter, and determining front and back surface curvatures of the spectacle lens to be customized at the minimum weight;
according to the front surface curvature and the rear surface curvature, performing aspheric optimization on the spectacle lens to be customized, and optimizing the edge area of the spectacle lens to be customized;
and generating a spectacle lens customization scheme corresponding to the first spectacle frame according to the front and back surface curvatures and the related optimization parameters of the edge area.
2. The eyeglass light weight customization method according to claim 1, wherein the calculating of the minimum diameter of the eyeglass lens to be customized based on the measurement parameters and the frame parameters is specifically:
the measurement parameters include: pupillary distance and height; the frame parameters include: the maximum horizontal width, the maximum vertical height, the geometric center distance of a left spectacle frame and a right spectacle frame and the minimum cutting edging amount of the spectacle frame;
judging whether the interpupillary distance meets a first preset requirement or not;
if so, the minimum diameter of the spectacle lens to be manufactured = the maximum frame diameter of the spectacle frame + (the geometric center distance-the interpupillary distance of the left and right spectacle frames) + the minimum cutting edging amount; wherein the maximum frame diameter of the spectacle frame takes a larger value of the maximum horizontal width and the maximum vertical height;
if not, the minimum diameter = the distance from the pupil center position to the farthest end of the spectacle frame x 2+ the minimum cutting edging amount of the spectacle lens to be manufactured.
3. The eyeglass lightweight customization method according to claim 1, wherein the eyeglass lens to be customized is designed to have a large curvature according to the diopter and the minimum diameter, and front and back surface curvatures of the eyeglass lens to be customized at the minimum weight are determined, specifically:
designing a large bend according to the following formula:
wherein V is the lens volume; d lens Is the diopter; n is the refractive index of the lens; t is the central thickness of the lens; r 1 Front surface curvature; r 2 Is the posterior surface curvature; r is half of the diameter of the preset lens;
and (3) deriving the lens volume, and determining the front and back surface curvature collocation of the spectacle lens to be customized under the minimum volume so as to determine the front and back surface curvatures of the spectacle lens to be customized under the minimum weight.
4. The eyeglass light weight customization method according to claim 3, wherein the eyeglass lens to be customized is optimized by aspheric optimization according to the front and back surface curvatures to optimize an edge area of the eyeglass lens to be customized, specifically:
according to the curvature of the rear surface, combining a preset even-order aspheric high-order term to construct rise surface type distribution, which is specifically as follows:
wherein the content of the first and second substances,
the distribution is of rise surface type; x is the distance from any point on the rear surface to the center of the circle; k is a conic coefficient, A, B, C, D, E is an even order aspheric higher order term;
calculating astigmatism of the spectacle lens to be customized in the edge area according to the sagittal height surface type distribution;
adjusting and optimizing the even order aspheric higher order term to make astigmatism of the edge area zero, thereby optimizing the edge area of the spectacle lens to be customized.
5. The eyeglass weight reduction customizing method according to any one of claims 1 to 4, further comprising, before the calculating a minimum diameter of the eyeglass lens to be customized based on the measurement parameter and the frame parameter:
judging whether the user is suitable for the first spectacle frame or not according to the measurement parameters and the spectacle frame parameters;
if the user is determined not to be suitable, feeding back reselection information to the user so that the user can reselect and select the spectacle frame;
if the position is determined to be proper, calculating the minimum diameter of the spectacle lens to be manufactured according to the measurement parameters and the parameters of the spectacle frame.
6. The eyeglass light weight customization method according to claim 5, wherein the determining whether the user fits the first eyeglass frame based on the measurement parameter and the frame parameter is specifically:
the measurement parameters comprise the interpupillary distance and the pupil height; the frame parameters include: the maximum vertical height of the spectacle frame and the distance between the geometric centers of the left spectacle frame and the right spectacle frame;
if (distance between geometric centers of left and right spectacle frames-interpupillary distance)/2 > 2.5mm, or (height of pupil-maximum vertical height of spectacle frame/2) > 2mm, determining that the user is not suitable for the first spectacle frame;
otherwise, determining that the user fits the first eyeglass frame.
7. An eyeglass lightweight customization scheme recommendation method, comprising:
the method comprises the steps of obtaining the interpupillary distance and diopter of a user, customizing all spectacle frames in inventory by combining the spectacle lightweight customizing method according to any one of claims 1 to 6, and generating a plurality of spectacle lens customizing schemes;
generating a weight gradient list of a full-inventory spectacle frame according to the weight of each spectacle lens customization scheme and the weight of the spectacle frame;
recommending the weight gradient list to a user so that the user can screen out the corresponding spectacle frame and spectacle lens customization scheme from the weight gradient list.
8. An eyeglass light-weight customization device, comprising: the device comprises an acquisition module, a calculation module, a large bend design module, a non-spherical optimization module and a generation module;
the acquisition module is used for acquiring measurement parameters of a user wearing a first spectacle frame and spectacle frame parameters corresponding to the first spectacle frame;
the calculation module is used for calculating the minimum diameter of the spectacle lens to be determined according to the measurement parameters and the spectacle frame parameters;
the large curve design module is used for obtaining diopter of the user, performing large curve design on the spectacle lens to be customized according to the diopter and the minimum diameter, and determining front and back surface curvatures of the spectacle lens to be customized at the minimum weight;
the aspheric optimization module is used for carrying out aspheric optimization on the spectacle lens to be customized according to the front and back surface curvatures and optimizing the edge area of the spectacle lens to be customized;
the generation module is used for generating an eyeglass customization scheme corresponding to the first eyeglass frame according to the front and back surface curvatures and the related optimization parameters of the edge area.
9. An eyeglass lightweight customization scheme recommendation system, comprising: a user data acquisition module, a list generation module, a recommendation module and the glasses lightweight customization device according to claim 8;
the user data acquisition module is used for acquiring the interpupillary distance and diopter of a user;
the glasses lightweight customizing device is used for customizing all spectacle frames in inventory according to the interpupillary distance and diopter of the user to generate a plurality of glasses customizing schemes;
the list generation module is used for generating a weight gradient list of a full-inventory spectacle frame according to the weight of each spectacle lens customization scheme and the weight of a spectacle frame;
the recommending module is used for recommending the weight gradient list to a user so that the user can screen out corresponding spectacle frame and spectacle lens customization schemes from the weight gradient list.
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