EP4466627A1 - Verfahren zur verbesserten bestimmung der fertigungskorrekturen - Google Patents
Verfahren zur verbesserten bestimmung der fertigungskorrekturenInfo
- Publication number
- EP4466627A1 EP4466627A1 EP23700276.1A EP23700276A EP4466627A1 EP 4466627 A1 EP4466627 A1 EP 4466627A1 EP 23700276 A EP23700276 A EP 23700276A EP 4466627 A1 EP4466627 A1 EP 4466627A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- parameters
- manufacturing
- lens
- correction
- model
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
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- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/27—Design optimisation, verification or simulation using machine learning, e.g. artificial intelligence, neural networks, support vector machines [SVM] or training a model
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B9/00—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor
- B24B9/02—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground
- B24B9/06—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain
- B24B9/08—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass
- B24B9/14—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass of optical work, e.g. lenses, prisms
- B24B9/148—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass of optical work, e.g. lenses, prisms electrically, e.g. numerically, controlled
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- G—PHYSICS
- G02—OPTICS
- G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
- G02C7/00—Optical parts
- G02C7/02—Lenses; Lens systems ; Methods of designing lenses
- G02C7/024—Methods of designing ophthalmic lenses
- G02C7/028—Special mathematical design techniques
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- G—PHYSICS
- G02—OPTICS
- G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
- G02C2202/00—Generic optical aspects applicable to one or more of the subgroups of G02C7/00
- G02C2202/08—Series of lenses, lens blanks
-
- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2111/00—Details relating to CAD techniques
- G06F2111/06—Multi-objective optimisation, e.g. Pareto optimisation using simulated annealing [SA], ant colony algorithms or genetic algorithms [GA]
Definitions
- the present invention relates to a computer-implemented method for specifying a manufacturing correction model, a storage device for storing the manufacturing correction model, a computer-implemented method for determining a manufacturing correction using the manufacturing correction model, and a corresponding manufacturing method. Furthermore, the invention relates to corresponding computer program products and devices.
- ophthalmic lenses such as spectacle lenses, contact lenses or intraocular lenses
- one task is to create the previously determined total surface area of the lens in a material.
- the overall surface of the lens can be defined, for example, by the edge contour, the front surface, the back surface, and the position and orientation of the front and back surfaces relative to one another.
- ophthalmic lenses are known in which at least part of the overall surface of an ophthalmic lens is a free-form surface.
- the free-form surface can be the back surface of the ophthalmic lens. It is also possible to design the front surface or both the front and back surfaces of the lens as free-form surfaces.
- the free-form surface can be parameterized by a set of so-called arrow heights.
- Other local representations such as a spline representation, or non-local representations, such as a Zernike decomposition, are also possible.
- one of the partial surfaces of the overall surface is a comparatively simple surface, such as a spherical surface
- only its curvature in a given reference point can be specified for this.
- the curvature of a spherical or rotationally symmetrical aspheric surface at a reference point is also referred to as a base curve.
- preliminary products also called semi-finished products or blanks
- a "finished" surface i.e. a surface whose geometry is not significantly changed in the subsequent processing steps (such as application of anti-reflection layers or other functional layers and/or coloring of the lens).
- the front surface of the preliminary product is the finished surface.
- the "finished" surface can be, for example, a spherical or a rotationally symmetrically aspherical surface.
- the "finished” surface can also be a toric, atoric, progressive or other free-form surface.
- a previously determined surface which is usually the back surface of the lens, is then applied to a previously selected preliminary product, for example with the aid of CNC surface processing machines.
- This surface is also referred to as the prescription surface and can be spherical, aspheric, cylindrical, atoric, progressive, or other free-form surface.
- the maximum permissible deviations of the previously determined surface (referred to below as the target surface) and the produced surface (referred to below as the actual surface) of the lens are limited by standards. Too large a deviation can, for example, not correct the ametropia sufficiently and/or negatively affect the tolerability of the lens.
- the deviations of the target and actual surface can be determined by measurable parameters be quantified or characterized.
- the optical measurement values of sphere, cylinder, axis and prism of the manufactured ophthalmic lens can be recorded in at least one point as well as the center thickness of the lens and compared with the corresponding target values in order to determine the deviations.
- An object of the present invention is to create an improved method that enables optimal manufacturing correction of the ophthalmic lenses
- This object is achieved by a computer-implemented method, a corresponding device and a corresponding computer program product for determining a manufacturing correction model, a storage device for storing a manufacturing correction model, a computer-implemented method, a corresponding device and a corresponding computer program product for determining a manufacturing correction, a method and a corresponding device for Manufacturing an ophthalmic lens having the features indicated in the respective independent claims.
- a computer-implemented A method of determining a manufacturing correction model for the manufacture of ophthalmic lenses is provided.
- the ophthalmic lenses can be spectacle lenses (such as single vision lenses, bi-focal or multifocal lenses, progressive lenses, etc.), contact lenses or intraocular lenses.
- the procedure includes:
- the manufacturing correction model being a mapping which—given the values of the model parameters—assigns at least one part of manufacturing corrections to each element of a selected definition set,
- the definition set comprises a multiplicity (ie two or more) of definition parameters and their variance, the definition parameters being parameters which characterize a lens to be produced and/or its production process; and the manufacturing corrections include correction parameters for describing a global and/or local change in at least one surface of an ophthalmic lens to be manufactured.
- the proposed flexible manufacturing correction model makes it possible to take into account the diverse influences on the quality of the finished ophthalmic lens and to determine corresponding manufacturing corrections quickly and efficiently. As a result, the manufacturing quality of lenses can be improved. It is also possible to continuously update and improve the surface model in a simple manner. Definition set and definition parameters
- a manufacturing correction model is determined to determine manufacturing corrections for the manufacture of ophthalmic lenses.
- the term “determine” in the sense of the present application also includes “determine”, “calculate”, “determine” and so on.
- a training data set comprising a first definition set and manufacturing corrections, which are assigned to the first definition set.
- the term “providing” as used in the present application includes “determining”, “transmitting”, “receiving”, “reading out”, “retrieving from a memory, a database and/or a table”, “receiving” and so on.
- the definition set includes a large number of definition parameters and their variance.
- the definition set includes a large number of definition parameters and their values.
- the large number of parameters are referred to as definition parameters.
- the definition parameters are parameters which characterize a lens to be produced and/or its production process.
- the definition parameters are order parameters and/or variables derived therefrom and/or production parameters.
- the manufacturing parameters are parameters that characterize the manufacturing process. The manufacturing parameters are preferably determinable before the ophthalmic lens is manufactured.
- the definition parameters can include at least one of the following parameters, for example:
- blank parameters including blank geometry, material and/or quality;
- the definition parameters can describe the lens geometry, for example.
- the parameters that describe the lens geometry can be, for example, parameters that describe the geometry of the front surface and/or the back surface of the ophthalmic lens and/or the position and/or orientation of the front surface and the back surface of the ophthalmic lens relative to one another.
- the surfaces can be spherical, toric, aspheric and atoric surfaces.
- the geometry of a spherical surface can be described, for example, by the parameters sphere or the curvature or base curve.
- the geometry of a toric surface can be described, for example, by the two principal curvatures and the direction of a principal curvature with respect to the glass horizontal or by the cylinder and the axis as parameters.
- the geometry of aspheric and atoric surfaces can be described, for example, by development coefficients (such as BSpline coefficients or Zernike coefficients) as parameters.
- the position and orientation of the two surfaces of the ophthalmic lens relative to one another can be described, for example, by a translation vector and a rotation matrix.
- the definition parameters can also be parameters that characterize the preliminary products (semi-finished products or blanks) used to produce ophthalmic lenses. These parameters are referred to below as blank parameters.
- the blank parameters include, for example, the blank geometry, the material and/or the quality of the blank.
- the blank geometry is determined by the geometry of the front and rear surfaces of the blank and the position and orientation of the two surfaces in relation to one another.
- the blank geometry can be characterized in an analogous manner by the parameters described in connection with the lens geometry. Of particular relevance is the area of the blank that is not processed further.
- the material of the blank can, for example, by a unique material names or the chemical and physical properties of the material. Exemplary properties of the material are density, Abbe number and refractive index.
- test results can contain, for example, the offsets or deviations of the finished surfaces from the target surfaces (given, for example, by the deviation of the base curve of the finished surface from the target value of the base curve).
- the definition parameters can also be parameters which characterize the properties of at least one machine used for production and/or at least one tool used for production and/or variables derived therefrom.
- Examples are the duration of use of the machine and/or tool; and/or control parameters of the at least one machine used, such as grinding machine, polishing machine, block station, tempering cabinet, etc.
- Other relevant definition parameters can be, for example, the location with environmental factors prevailing during the selection, number of work steps since the last maintenance, the tools to be used and work equipment and its properties, the operators of the machines and so on.
- the period of use of the tools and/or the machines in the manufacturing process has a significant influence on the quality of the manufactured ophthalmic lenses.
- the diamond tools in the grinding machines are rounded off with use, so that gradients in the finished surfaces are smaller than theoretically calculated.
- the quality of the tools is monitored and worn tools are serviced or replaced.
- the control parameters of the production machine are, for example, the processing speed of the grinding and polishing machine, the cooling times and/or the tempering times. These parameters have an impact on the quality of the ophthalmic lens as well as on the manufacturing time and costs.
- the control parameters of at least one of the production machines used for example, systematic deposits or deviations can be corrected. It is also possible to change the control parameters, even with the quality remaining the same, in such a way that the production time is shortened and/or the production costs are reduced.
- Ordering data or ordering parameters for the ophthalmic lens and/or sizes derived therefrom are ordersing data or ordering parameters for the ophthalmic lens and/or sizes derived therefrom.
- Examples of the environmental factors in manufacturing are humidity, temperature and/or air pressure. Taking these factors into account can increase the quality of the manufactured ophthalmic lenses and/or reduce manufacturing costs.
- ordering data or ordering parameters can be found in the current standards for spectacle lenses (see, for example, the EU Directive 93/42/EEC on medical devices).
- ordering data or ordering parameters of the lens are the desired thickness of the lens, the coating, the refraction or prescription data (such as sphere, cylinder, axis, if necessary addition or near refraction, prism with base), geometric parameters of a spectacle frame, intended use of the ophthalmic lens , physiological characteristics of the future wearer of the ophthalmic lens, biometric data of the eye(s) of the future wearer (e.g. position of the center of rotation of the eye, individual structure of the eye, pupil diameter, etc.), the future wearer's preferred viewing behavior, as well as other known parameters for individualization and personalization of ophthalmic lenses (e.g. mapped in a design characteristic or the location of the reference points, length of progression, etc.).
- variables derived from the order data is the target surface and its position and orientation.
- the target surface can be represented, for example, by a so-called sagittal field, by splines or Zernike coefficients, or in another suitable manner.
- the position and orientation of the target area can be represented by a translation vector and a rotation matrix, for example.
- the manufacturing corrections include parameters for describing global and/or local changes of at least one surface of the ophthalmic lens to be manufactured or one that has already been manufactured.
- the changes may include, for example, adjustments to the location and orientation of the surface, local changes to the surface at arbitrary points, adjustments to the versine field of the surface, and/or the spline or Zernike coefficients of the surface.
- the changes to the surface of the ophthalmic lens that is to be produced or produced can be made, for example, by overlaying this surface with a correction surface.
- the production corrections then include parameters of the correction surface.
- the correction surface can be a surface which, in at least one point, changes the spherical power of the previously refracted lens by the manufacturing correction of the spherical power.
- the position and orientation of the surface of the ophthalmic lens to be manufactured can be corrected such that the prismatic value of the lens is modified by the manufacturing correction of the prismatic value and/or the thickness value of the lens is modified by the manufacturing correction of the thickness value.
- the manufacturing corrections contained in the training data record can be determined in a manner known per se from ophthalmic lenses that have already been manufactured.
- At least two lenses that differ in the definition set can be manufactured for the training data contained in the training data set.
- the values of the definition parameters and the manufacturing corrections determined from the manufactured lens can be recorded in a manner known per se.
- the manufacturing corrections can include the parameters of a correction surface, the correction surface changing the spherical measured value of the finished lens in at least one point by the manufacturing correction of the spherical measured value.
- the position and orientation of the manufactured surface can be corrected, so that the prismatic measured value is modified by the manufacturing correction of the prismatic measured value and/or the thickness measured value by the manufacturing correction of the measured thickness value.
- providing a training dataset may include:
- the manufacturing correction for the lens is determined in such a way that the difference between at least one measured value of the finished lens and the corresponding target value is minimized.
- the production correction can be determined in such a way that the difference between at least one measured value of the finished lens and the corresponding desired value is equal to or within zero specified tolerances.
- the manufacturing corrections are determined based on the deviation between the actual surface of the finished lens and a target surface of the lens in such a way that the deviation is minimized.
- the manufacturing correction model is a mapping that associates at least a portion of the manufacturing corrections with each element of a selected definition set.
- the mapping can be any statistical model that is derived from the training data in the training data set using statistical methods. This derivation generally constitutes "training" an original, untrained manufacturing correction model.
- training in the context of the present application is generally understood to mean applying any statistical method to the training data set provided in order to determine values for at least some of the model parameters.
- all trainable model parameters of the production correction model can be determined with the aid of the training data set, in that a target function, which is evaluated with the training data set, is minimized or maximized by changing the trainable model parameters.
- the trained manufacturing correction model can be used to predict the manufacturing correction needed to manufacture an ophthalmic lens.
- the manufacturing correction model can: be or comprise a linear, multilinear or non-linear regression model, wherein the coefficients of the regression model represent at least part of the model parameters of the manufacturing correction model; and/or be or comprise a classification model; and/or be a neural network or at least comprise a neural network.
- the manufacturing correction model can be described by suitably defined model parameters, which are used together with at least some of the definition parameters for determining the manufacturing corrections.
- a production correction model defined by model parameters can be implemented as a classification method or contain one that contains at least a part or, for example, all definition parameters as input variables.
- the production correction model can be designed as a regression model or contain a regression model which contains at least some or, for example, all definition parameters as input variables.
- combinations of classification methods and regression models are also possible.
- the coefficients of the classification method and/or the regression model represent at least part of the model parameters of the production correction model.
- the regression model used in the manufacturing correction model or as the manufacturing correction model can be a linear regression model, which typically facilitates the calculations necessary to determine the manufacturing correction model since the model parameters can be determined from a linear equation system.
- a non-linear regression model can be used instead of a linear regression model.
- Such a model is more flexible and can depict more complex relationships between the definition parameters and the manufacturing corrections of the ophthalmic lenses.
- non-linear optimization algorithms are typically used for this purpose, which do not necessarily converge to the global optimum of the model parameters.
- neural networks or other machine learning models can be used as non-linear regression models.
- a neural network used in or as a manufacturing correction model may be, for example, a deep neural network having at least one hidden layer, a convolutional neural network, or another neural network.
- the input layer of such a neural network is assigned at least some of the definition parameters and/or auxiliary variables calculated therefrom.
- the output layer of the neural network outputs at least part of the manufacturing corrections.
- each neural network of the plurality of neural networks can predict a manufacturing correction, respectively.
- a multi-task model is also possible, with a neural network predicting a large number of production corrections (e.g. all production corrections).
- the weights of the neural network represent at least part of the trainable model parameters.
- the neural network can also contain one or more hidden layers in addition to the input and output layers.
- the way in which the neural network is constructed can be implicitly defined by hyperparameters, such as the number of layers, the number of neurons in the different layers, and the way in which the layers are linked to one another.
- the production correction model has a sufficiently large number of model parameters, eg more than 10, 30, 50, 100, 500, or 1000, 10000, 100000 or even more model parameters.
- Special methods of machine learning can be advantageous for designing and/or training the neural network. These include, for example, attention technique and/or convolutional neural network techniques.
- Attention technique With this method, the effect of important input data is amplified and unimportant ones are hidden. The importance of the input data is learned during the training of the model. The advantage of this technique is that it is not necessary to preselect the definition parameters, but the more important parameters still influence the model.
- Convolutional neural networks are specifically designed for processing multidimensional input data. These techniques can be used to find and categorize structures in multidimensional input data. For example, the categorizations sought are determined by a vector with fewer dimensions than the input object. This technique can be advantageous if the definition parameters contain aspheric and atoric surfaces represented by two-dimensional splines. With these techniques, the surfaces can be examined and relevant properties can be extracted for the determination of the manufacturing corrections. Examples of relevant properties are the strength and course of surface gradients. The properties found, described by a low-dimensional vector, are processed by further layers of the neural network, so that the production corrections can be determined from them.
- a so-called regularization can also be used in addition to or instead of a direct variation of the number of trainable parameters of the manufacturing correction model, in which further terms weighted with a factor are added to the target function of the trainable parameters of the manufacturing correction model .
- These can be, for example, quadratic terms in the trainable parameters. It is also possible to vary the number of model parameters in order to adjust the complexity of the (untrained) production correction model.
- a split can be given by e.g. 60%, 20% and 20%.
- the three sets of data can be used as follows:
- Training data set As described above, all trainable parameters of the production model are determined with the aid of the training data set by a target function being evaluated with the training data set by minimizing and maximizing changes in the trainable parameters.
- Non-trainable parameters called hyperparameters
- hyperparameters are determined with the help of the validation dataset. After the training of the model, a target function is evaluated with the validation data set and minimized by changing the non-trainable parameters. The method is also referred to as hyperparameter optimization.
- Test data set With the help of the test data set, the predictive power of the trained and hyperparameter-optimized model can be determined by comparing the predictions from the test data set with the actual values of the test data set.
- the computer-implemented method for determining a manufacturing correction model may further include:
- a hyperparameter is a parameter used to control a training algorithm and, unlike other parameters, its value must be set before actually training the model.
- the hyperparameters can be model parameters, for example, which cannot be trained with the training data set or are not trained.
- the values for the hyperparameters of the trained manufacturing correction model can be determined by means of a statistical method using the validation data set provided.
- a target function (validation target function) can be evaluated with the validation data set after the training of the production correction model and minimized or maximized by changing the hyperparameters.
- the validation objective function can be the same as or different from the objective function used in training the manufacturing correction model with the training data set.
- test data set comprising a third definition set and the third definition set assigned manufacturing corrections
- testing can:
- testing of the trained manufacturing correction model can be considered successful.
- the trained manufacturing correction model can then be used to predict the manufacturing corrections for the manufacture of ophthalmic lenses.
- training and optionally validating the manufacturing correction model can continue using additional training data.
- the manufacturing correction model can be expanded or modified.
- the method for determining a manufacturing correction model for the manufacture of at least one ophthalmic lens may further include storing the trained manufacturing correction model in a storage device.
- the storage device may be, for example, a database, a computer or data cloud, or other suitable storage medium that permanently or non-permanently stores the trained manufacturing correction model.
- the method may include transmitting the manufacturing correction model to an external entity, such as an ophthalmic lens manufacturer, manufacturing entity, manufacturing device, etc.
- the manufacturing correction model can optionally be stored together with at least part of the training data set used to determine the manufacturing correction model and, if necessary, transmitted to an external unit.
- a second aspect of the invention relates to a storage device for storing a manufacturing correction model determined according to the method described above.
- the storage device may be, for example, a database, a computer or data cloud, or other suitable storage medium that permanently or non-permanently stores the trained manufacturing correction model.
- a third aspect of the invention relates to a computer-implemented method for determining a manufacturing correction for at least one surface to be manufactured of an ophthalmic lens, comprising:
- lens parameters characterizing the lens to be produced and/or its production process
- the manufacturing correction comprises correction parameters for describing a global and/or local change in the at least one surface of the ophthalmic lens to be manufactured.
- the lens parameters can be the same parameters used in training the manufacturing correction model, with the lens parameters taking on values specific to the ophthalmic lens to be manufactured. At least some of the lens parameters provided represent the input variable of the provided production correction model. The output variable is the production correction determined or predicted for the lens to be produced.
- the production correction determined in this way can be stored permanently or non-permanently in a storage device. Furthermore, the manufacturing correction thus determined can be transmitted to an external entity such as an ophthalmic lens manufacturer, a manufacturing entity, a manufacturing device, etc.
- a fourth aspect of the invention relates to a computer program product which, when loaded into the memory of a computer and executed on it, causes the computer to carry out a method for determining a manufacturing correction model according to the first aspect described above and the exemplary embodiments and variants or a method to determine a production correction according to the third aspect described above and the exemplary embodiments and variants.
- a fifth aspect of the invention relates to a device for determining a production correction model for the production of ophthalmic lenses, the device comprising a computing device which is designed to carry out the method according to the first aspect described above and the exemplary embodiments and variants.
- a sixth aspect of the invention relates to a device for determining a manufacturing correction for at least one surface to be manufactured of an ophthalmic lens, the device comprising a computing device which is designed to carry out the method according to the third aspect described above and the exemplary embodiments and variants.
- a seventh aspect of the invention relates to a method for producing an ophthalmic lens comprising:
- lens parameters characterizing the lens to be produced and/or its production process
- An eighth aspect of the invention relates to a device for producing an ophthalmic lens, comprising: a lens parameter providing device for providing lens parameters, the lens parameters characterizing the lens to be produced and/or its production process;
- Area determining device for determining a first area to be manufactured of the ophthalmic lenses based on at least some of the lens parameters; and a device for determining a production correction for at least one surface to be produced according to the sixth aspect, wherein the surface determination device is further designed to determine a second corrected surface on the basis of the determined production correction by a combination of the determined production correction with the first surface; and wherein the apparatus for manufacturing an ophthalmic lens further comprises a manufacturing apparatus for manufacturing the ophthalmic lens having the second corrected surface.
- the above devices for providing, determining, specifying or calculating data can be implemented by suitably configured or programmed data processing devices (in particular specialized hardware modules, computers or computer systems, such as computer or data clouds) with appropriate computing units, electronic interfaces, memories and data transmission units.
- the above-mentioned devices can also have suitable interfaces that allow data (such as training data sets, definition sets, definition parameters, model data, model parameters, hyperparameters, target values, production correction data, surface data, etc.) to be transmitted or input or read out.
- the devices can also include at least one memory unit, e.g. in the form of a database, which stores the data used.
- the manufacturing device can, for example, at least one CNC-controlled machine direct processing of a blank according to the determined specifications (e.g. surface data and production correction data).
- the ophthalmic lens can be manufactured using a casting process.
- the finished ophthalmic lens preferably has a simple spherical or rotationally symmetrical aspherical surface and a surface which has been corrected using the production correction model according to one aspect of the method according to the invention.
- the simple spherical or rotationally symmetrical aspherical surface is the front surface (ie the object-side surface) of the ophthalmic lens.
- the surface corrected with the manufacturing correction model can also be corrected with the aid of the production correction model.
- the invention provides a use of an ophthalmic lens manufactured according to the manufacturing method according to the invention in a predetermined average or ideal usage position of the lens in front of the eyes of a specific wearer to correct ametropia of the wearer.
- the ophthalmic lens can in particular be a spectacle lens.
- the ophthalmic lens can also be a contact lens or an intraocular lens.
- FIG. 1A to 1C a graphical representation of the manufacturing corrections for the spherical value (FIG. 1A), the cylindrical value (FIG. 1B) and the lens thickness (FIG. 1C) of a spectacle lens as a function of the predicted using an exemplary linear manufacturing correction model from the base curve of the lens;
- Figures 2A through 2C are a graphical representation of the linear manufacturing correction model predicted manufacturing corrections for the spherical power (Fig. 2A), the cylindrical power (Fig. 2B) and the lens thickness (Fig. 2C) of a spectacle lens depending on the target value of the sphere of a spectacle lens;
- FIG. 3A to 3C a graphic representation of the manufacturing corrections for the spherical value (Fig. 3A), the cylindrical value (Fig. 3B) and the lens thickness (Fig. 3C) of a spectacle lens as a function of the target value of the lens, which were predicted using an exemplary linear manufacturing correction model lens cylinder;
- FIG. 4A to 4C a graphic representation of the manufacturing corrections for the spherical value (Fig. 4A), the cylindrical value (Fig. 4B) and the lens thickness (Fig. 4C) of a spectacle lens as a function of the target value of the lens, which were predicted using an exemplary linear manufacturing correction model lens thickness;
- FIG. 5A to 5C a graphical representation of the manufacturing corrections for the spherical value (Fig. 5A), the cylindrical value (Fig. 5B) and the lens thickness (Fig. 5C) of a spectacle lens as a function of the pre-decentration predicted using an exemplary linear manufacturing correction model a spectacle lens;
- FIG. 6A through 6C graphically depict the manufacturing corrections for the spherical power (FIG. 6A), the cylindrical power (FIG. 6B), and the lens thickness (FIG. 6C) of an eyeglass lens predicted using an exemplary multilinear manufacturing correction model;
- FIG. 7A through 7C graphically depict the manufacturing corrections for the spherical power (FIG. 7A), the cylindrical power (FIG. 7B), and the lens thickness (FIG. 7C) of an eyeglass lens predicted using an exemplary nonlinear manufacturing correction model.
- Exemplary manufacturing correction models and the predicted manufacturing corrections based thereon for the spherical power and the cylindrical power as well as for the lens thickness of a non-prismatic single vision lens made of a given material are described below.
- the definition parameters are particularly advantageous Parameters that describe the front and back surface of the calculated lens as well as the position and orientation of the two surfaces to each other and the blank geometry.
- the definition parameters are the curvature of the base curve in dpt ("BK”), the main curvature of the rear surface (described by the target value for the sphere in dpt ("sphSoll” or “sollSph” and the target value for the cylinder in dpt ("cylSoll” or “sollCyl” ), the pre-decentration in mm (“vordez”) and the thickness in mm (“dickSoll” or "sollDick”) of the spectacle lens.
- the manufacturing corrections to be predicted are the deviation in dpt ("sph”) of the spherical measured value from the spherical target value ("sphSoll” or “sollSph”), the deviation in dpt ("cyl”) of the cylindrical measured value from the cylindrical target value (“cylSoll” or “sollCyl”) and the deviation in mm of the measured glass thickness ("thick” ) of the lens from the target value for the glass thickness ("dickSoll” or "sollDick”).
- the production correction models were trained or statistically determined using a training data set comprising around 34,000 data sets.
- the predictions obtained using the trained manufacturing correction models are shown in FIGS. 1A to 7C, with the predictions being plotted against the true values from the training data set.
- the "true values” are the production corrections from the training data, i.e. the deviations of the measured values from the corresponding target values. For the sake of clarity, every 100th data set is shown in the figures.
- FIGS. 1 to 5 show the predicted manufacturing corrections, which were determined by means of a linear regression on the training data set.
- Xj denotes the value of the jth definition parameter
- a t j and denote the model parameters
- i G ⁇ sph, cyl, thick ⁇ denotes the ith predicted magnitude
- j G ⁇ BK, sollSph, sollCyl, sollDick, predec ⁇ denotes the j-th definition parameter.
- the variances of the production corrections cannot always be sufficiently predicted; only for individual models is the sum of the squared errors between the true value and the prediction smaller than the variance of the data.
- the models with a larger coefficient of determination are the spherical correction depending on the pre-decentration with a coefficient of determination of approx. 11%, the cylindrical correction depending on the cylindrical target value with a coefficient of determination of approx. 2% and the thickness correction depending on the pre-decentration with a coefficient of determination about 1%.
- FIGS. 6A to 6C show the predicted manufacturing corrections, which were determined by means of a multilinear regression on the training data set.
- a separate manufacturing correction model is determined for each prediction variable, taking into account a linear relationship with the definition parameters: where: y t denotes the predicted value for the ith predictor; Xj denotes the value of the jth definition parameter; a t j and ßi denote the model parameters; ie ⁇ sph, cyl, thick ⁇ denotes the ith predicted size; each ⁇ BK, sollSph, sollCyl, sollDick, vordez ⁇ designates the j-th definition parameter.
- the variances of the data are not always fully predictable, but the sum of the squared errors between the true value and the prediction is smaller than the variance of the data, so that the coefficient of determination for the prediction of the spherical correction is approx. 1 1% as well for the predictions of the cylindrical correction is about 3% and the thickness correction is about 2%.
- Figures 7A through 7C show the predicted manufacturing corrections determined using non-linear models.
- Each manufacturing correction model is a neural network with 5 fully connected layers of 5 neurons each and an output layer of 1 neuron.
- the degree of determination for all predictions can be increased.
- an increase in the coefficient of determination from approx. 3% to approx. 14% can be achieved from the multilinear to the nonlinear model.
- the determination dimension can be increased from approx. 2% to 4%.
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Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102022200462.0A DE102022200462B3 (de) | 2022-01-17 | 2022-01-17 | Computerimplementiertes Verfahren zum Bestimmen eines Fertigungskorrekturmodells für die Herstellung von ophthalmischen Linsen, Speichervorrichtung, Computerprogrammprodukt, Verfahren sowie Vorrichtung |
| PCT/EP2023/050604 WO2023135194A1 (de) | 2022-01-17 | 2023-01-12 | Verfahren zur verbesserten bestimmung der fertigungskorrekturen |
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| Publication Number | Publication Date |
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| EP4466627A1 true EP4466627A1 (de) | 2024-11-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| EP23700276.1A Pending EP4466627A1 (de) | 2022-01-17 | 2023-01-12 | Verfahren zur verbesserten bestimmung der fertigungskorrekturen |
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| Country | Link |
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| EP (1) | EP4466627A1 (de) |
| DE (1) | DE102022200462B3 (de) |
| WO (1) | WO2023135194A1 (de) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2891568C (en) | 2012-11-14 | 2021-11-02 | Essilor International(Compagnie Generale D'optique) | Method for determining the feasibility of an ophthalmic lens |
| MX347526B (es) | 2012-11-14 | 2017-04-27 | Essilor Int | Metodo para determinar los parametros opticos de una lente oftalmica. |
| EP3881129B1 (de) * | 2018-11-15 | 2025-08-20 | Essilor International | Verfahren und system zur bestimmung von parametern, die zur herstellung eines optischen artikels verwendet werden, und zugehöriger optischer artikel |
| DE102020004840A1 (de) | 2020-08-07 | 2022-02-10 | Rodenstock Gmbh | Verbesserte Berechnung ophthalmischer Linsen |
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| WO2023135194A1 (de) | 2023-07-20 |
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