A method of manufacturing a spectacle lens and computer program

Abstract

The invention relates to a method for producing a spectacle lens individualized by prescription data from a spectacle lens prefabricate (12) in a production process (10), which comprises the following steps: Providing spectacle lens prefabricates (12) and qualifying the spectacle lens prefabricates (12) by checking for the presence of a defect, and further treatment of the spectacle lens prefabricates (12) in the production process (10) as a function of quality information assigned to the spectacle lens prefabricates (12) during qualification. The quality information is quality information from the group "Quality information A: Spectacle lens prefabricate has no defect", "Quality information B: Spectacle lens prefabricate has a defect in an outer edge area and has no defect in an inner area complementary to the outer edge area", "Quality information C: Spectacle lens prefabricate has a defect in an inner area complementary to the outer edge area". A spectacle lens prefabricate (12), to which the quality information B is assigned, is linked with prescription data in a calculation engine (45) in order to generate shaping data for the spectacle lens prefabricate (12), wherein the generated shaping data is compared with the quality information B in order to determine whether a semi-finished spectacle lens product can be produced from the spectacle lens prefabricate (12) which has a shaping corresponding to the shaping data and which satisfies a predetermined quality standard. For checking the predetermined quality standard, it is determined whether the shaping data describe a semi-finished spectacle lens product for which an oversize edge area of the spectacle lens prefabricate (12) is removed which has an oversize towards the inside in relation to the outer edge area.

Description

[0001] u

[0002] - 1 -

[0003] A method of manufacturing a spectacle lens and computer program

[0004] Specification

[0005] The invention relates to a method for producing a spectacle lens individualized by prescription data from a spectacle lens prefabricate in a production process, which comprises the following steps: providing spectacle lens prefabricates and qualifying the spectacle lens prefabricates by checking for the presence of a defect and further treating the spectacle lens prefabricates in the production process as a function of quality information assigned to the spectacle lens prefabricates during qualification.

[0006] Such a process is known from EP 3 388 813 B1 and US 2022 / 308360 A1 . This describes how the manufacture of individualized spectacle lenses is based on so-called spectacle lens prefabricates which are selected in such a way that an area which has undesirable defects can be removed by a surfacing and / or a shaping process finalizing the manufacturing process without impairing the requirements placed on the individualized spectacle lens.

[0007] US 2020 / 371380 A1 describes the manufacture of spectacle lenses from spectacle lens prefabricates using a sticker on which, among other things, quality data relating to a spectacle lens blank is stored.

[0008] US 2020 / 142216 A1 discloses a method for manufacturing spectacle lenses that allows measured values for individual spectacle lenses to be retrieved.

[0009] The object of the invention is to provide a method for manufacturing a spectacle lens individualized by prescription data from a spectacle lens prefabricate, which enables the use of spectacle lens prefabricates with defects which can impair the result of processing and treatment steps required in the manufacture of spectacle lenses, and which ensures that a spectacle lens individualized by prescription data satisfies predetermined quality requirements. This problem is solved by the method specified in claim 1 for manufacturing a spectacle lens individualised by prescription data from a spectacle lens prefabricate in a production process.

[0010] Advantageous embodiments and further embodiments of the invention are given in dependent claims.

[0011] In a manufacturing process for spectacle lenses, spectacle lens prefabricates are subjected to machining in a so-called basic lens production process, which defines one of the two optically effective surfaces of the ophthalmic lens prefabricates and the edge of these surfaces.

[0012] Against this background, the invention is based on the idea of also using spectacle lens prefabricates, in particular in the form of so-called pucks or blanks with defects, during the manufacture of spectacle lenses which are individualised by prescription data, the defects being located in an area which is removed during spectacle lens manufacture. So-called pucks or blanks are normally circular blocks of glass or plastic which may have a curved and optically effective surface, whereby the diameter D of the circular blocks lies in a range for example: 50 mm < D < 85 mm. Such pucks or blanks may consist of various materials having a defined refractive index.

[0013] One idea of the invention is to check whether defects are located within an outer radius of, for example, 4 mm of the spectacle lens prefabricates during the manufacture of spectacle lenses. These spectacle lens prefabricates are then provided with a marking specifying these spectacle lens prefabricates during the production of spectacle lenses individualised by prescription data from spectacle lens prefabricates, i.e. in a production process, and stored separately from spectacle lens prefabricates which are without defects. The invention proposes that, as part of the production process for spectacle lenses which are individualised by prescription data, spectacle lens prefabricates are fed to a so-called prescription lens production facility for processing the spectacle lens prefabricates. A calculation engine then checks whether a predefined area, in particular an outer radius of e.g. 5 mm, is removed during the production of the prescription lenses as part of the so-called basic lens production.

[0014] If the calculation engine recognizes that a predefined area is removed during the production of prescription lenses as part of the basic lens production process, it provides information, e.g. for people working in the lens production facility, that such spectacle lens prefabricates can be used for the production of lenses individualized using prescription data.

[0015] The calculation engine checks whether the predefined area is removed during basic lens production and not only during the so-called surfacing and / or shaping process, which may conclude the production of lenses individualized using prescription data. In the surfacing and / or shaping process the optical effect is created by giving the puck a certain shape. The final step of producing a prescription lens then is the cutting, edging and fitting to get it to the frame shape.

[0016] Defects in a spectacle lens prefabricate can have a detrimental effect on the quality of coatings on a spectacle lens. In particular, the quality of an anti-re- flective coating, a hard coating or a clean coating can be impaired by defects.

[0017] The invention achieves that an area with defects in a spectacle lens prefabrication is removed during the basic lens production in accordance with the prescription data of a spectacle lens individualised with it in such a way that an individualised spectacle lens is not impaired by the material removal that takes place during the so-called basic lens production. The processed spectacle lens prefabricated product can then be coated after basic lens production without the coating being affected by defects.

[0018] The method specified in claim 1 for producing a spectacle lens individualized by prescription data from a spectacle lens prefabricated product in a production process comprises providing spectacle lens prefabricates, qualifying the spectacle lens prefabricates by checking for the presence of a defect and further treating the spectacle lens prefabricates in the production process as a function of quality information assigned to the spectacle lens prefabricates during qualification.

[0019] According to the invention, the quality information is quality information from the group "Quality information A: Spectacle lens prefabricate has no defect", "Quality information B: Spectacle lens prefabricate has a defect in an outer edge area and has no defect in an inner area complementary to the outer edge area", "Quality information C: Spectacle lens prefabricate has a defect in an inner area complementary to the outer edge area".

[0020] The invention proposes separating spectacle lens prefabricates to which the quality information C is assigned from the production process.

[0021] Spectacle lens prefabricates to which the quality information A or B is assigned are packaged, with the quality information A or B being stored on a storage medium that is connected to the packaging or integrated into the packaging. In this way, it is possible to ensure that the quality information assigned to a spectacle lens prefabricate is available in a prescription data production stage during further processing of the spectacle lens prefabricate. There is also the possibility to have no packaging at all in some production sites. In these sites the information is stored directly on the puck e.g. via a DMC Sticker.

[0022] A spectacle lens prefabricate, to which the quality information B is assigned, is linked with prescription data in a calculation engine in order to generate shaping data for the spectacle lens prefabricate, the generated shaping data being compared with the quality information B in order to determine whether a so-called semi-finished spectacle lens can be produced from the spectacle lens prefabricate. A semi-finished spectacle lens is a spectacle lens that has a shape corresponding to the cribbing shape data and that fulfils a specified quality standard, but which has not yet been adapted to the shape of the spectacle lens frames in a spectacle frame by grinding.

[0023] To check the specified quality standard, it is determined whether the shaping data describe a semi-finished spectacle lens product for which an oversize edge area of the spectacle lens prefabricate is removed, which has an oversize towards the inside in relation to the outer edge area.

[0024] The vertical projection of the edge area of the spectacle lens prefabricate can have a ring shape, for example. In particular, the vertical projection of the edge area of the spectacle lens prefabricate can be a circular ring. The circular ring may have an outer circle that coincides with an outer edge of the spectacle lens prefabricate.

[0025] In particular, the circular ring can have an inner circle whose radius ri satisfies the following relationship with the radius ra of the outer circle: ra - ri < 4 mm, preferably ra - ri = 4 mm. It is to be remarked that the circular ring could also have an inner circle whose radius ri satisfies the following relationship with the radius ra of the outer circle: ra - ri < 3 mm, preferably ra - ri = 2 mm or ra - ri < 8 mm, preferably ra - ri = 7 mm.

[0026] For example, the oversize edge area can have a circular ring shape with an inner circle whose radius r satisfies the following relation: ri - r > 1 mm, where ri is the radius of the inner circle of the circular ring.

[0027] One idea of the invention is that the spectacle lens prefabricate is only subjected to a surfacing process for a surface corresponding to the surface data for producing a spectacle lens semi-finished product if the comparison with the quality information assigned to the spectacle lens has shown that a semi-finished spectacle lens produced from the spectacle lens prefabricate satisfies the specified quality standard.

[0028] A high quality standard can be guaranteed by inspecting a semi-finished spectacle lens produced in the surfacing and / or shaping process for defects.

[0029] Within the scope of the invention, the semi-finished spectacle lens product passes the surfacing and / or shaping process before coating.

[0030] In particular, it is possible for the semi-finished spectacle lens product to be surfaced and / or shaped for mounting in an spectacle frame after coating.

[0031] The invention also relates to a computer program for use in a method described above for producing a spectacle lens individualized by prescription data from a spectacle lens prefabricate in a production process.

[0032] The computer program is adapted to assigning quality information to a spectacle lens prefabricate and to process spectacle lens prefabricate quality information from the group "Quality information A: Spectacle lens prefabricate has no defect", "Quality information B: Spectacle lens prefabricate has a defect in an outer edge area and has no defect in an inner area complementary to the outer edge area, "Quality information C: Spectacle lens prefabricate has a defect in an inner area complementary to the outer edge area".

[0033] The computer program is further adapted to link a spectacle lens prefabricate, to which the quality information B is assigned, with prescription data in a calculation engine in order to generate shaping data for the spectacle lens prefabricate, wherein the generated shaping data is compared with the quality information B in order to determine whether a semi-finished spectacle lens product can be produced from the semi-finished spectacle lens product which has a shaping corresponding to the shaping data and which satisfies a predetermined quality standard.

[0034] For checking the predetermined quality standard, the computer program is adapted to determine whether the shaping data describe a semi-finished spectacle lens product for which an oversize edge area of the spectacle lens prefabricate is removed which has an oversize towards the inside in relation to the outer edge area.

[0035] The invention is explained in more detail below with reference to the schematic embodiments shown in the drawing.

[0036] It shows:

[0037] Fig. 1 a production process for the manufacture of spectacle lenses individualised by prescription data with a preparation stage and with a prescription data production stage which has an order processing section, a calculation section and a machining section;

[0038] Fig. 2 a first process flow diagram for the preparation stage of the process;

[0039] Fig. 3 a second process flow diagram for the prescription data production stage of the process with the order processing section and with the calculation section;

[0040] Fig. 4 a spectacle lens prefabricate; and

[0041] Fig. 5 a third process flow diagram for the prescription data production stage of the process with the machining section.

[0042] The production process 10 shown in Fig. 1 for the manufacture of spectacle lenses individualized by prescription data has different process stages, which spectacle lens prefabricates 12 that may also be called pucks or lens blanks pass through depending on quality information assigned to the spectacle lens prefabricates 12 in the process. The production process 10 has a preparation stage 14 and contains a prescription data production stage 19 with an order processing section 15, a calculation section 16 and a processing section 18. The preparation stage 14 can be located at different locations as part of a mass production of spectacle lens prefabricates and the calculation section 16 and the processing section 18 in the prescription data production stage 19 of the production process 10.

[0043] Fig. 2 is a first process flow diagram for the preparation stage 14 of the production process 10. In the preparation stage 14, in a process step 20, mould shells 22 fed to the preparation stage 14 with spectacle lens preforms made of a plastic material accommodated therein are opened after the plastic material has been cast and hardened in order to remove the spectacle lens prefabricate 12.

[0044] The spectacle lens prefabricate 12 is then cleaned in a process step 24 following process step 20 and freed of unwanted residues from the casting process. This is followed by a process step 26 in which the spectacle lens prefabricates 12 are qualified for the presence of a defect. In process step 26, the position and type of defects of the spectacle lens prefabricates 12 are recorded using optical methods as quality information from the following group: "Quality information A: Spectacle lens prefabricate has no defect", "Quality information B: Spectacle lens prefabricate has a defect in an outer edge area and has no defect in an inner area complementary to the outer edge area", "Quality information C: Spectacle lens prefabricate has a defect in an inner area complementary to the outer edge area".

[0045] In a process step 28, spectacle lens prefabricates 12 are then fed to a process section P1 or a process section P2 depending on the quality information recorded for them. Spectacle lens prefabricates 12 with the quality information A assigned to them, i.e. spectacle lens prefabricates 12 that do not have any defects, arrive here on the process section P1 . In a process step 30, spectacle lens prefabricates 12 are individually packaged on the process section P1 , whereby each packaged spectacle lens prefabricate 12 is then provided with a data matrix code 33 in a process step 32 and made available in a warehouse 34 so that it can be fed from the warehouse to the prescription data production stage 19 of the production process 10. There is also the possibility to have no packaging at all in some production sites. In these sites the infomation is preferably stored directly on the puck e.g. via a DMC Sticker.

[0046] Spectacle lens prefabricates 12 with the quality information B or C, i.e. spectacle lens prefabricates 12 that have a defect, reach the process section P2 in the production process 10.

[0047] In a process step 35 on the process line P2, spectacle lens prefabricates 12 with the quality information C are separated from the production process 10 and fed to a waste station 37.

[0048] Spectacle lens prefabricates 12 with the quality information B assigned to them are then in turn individually packaged on the process section P2 in a process step 36, wherein each packaged spectacle lens prefabricate 12 is provided with a data matrix code containing the quality information and is provided in a warehouse 40. The warehouse 40, like the warehouse 34, is used for supplying spectacle lens prefabricates 12 with the quality information B to the calculation section 16 of the production process 10. There is also the possibility to have no packaging at all and to store the information directly on the puck e.g. via a DMC Sticker. Fig. 3 is a second process flow diagram for the prescription data production stage 19 of the production process 10 with the order processing section 15 and with the calculation section 16.

[0049] In the order processing section 15, spectacle lens prefabricates 12 received in a package with a DataMatrix code as a storage medium for quality information or with a Data Matrix code attached to the puck or laser-engraved in the puck or etched in the puck are then provided in a spectacle lens prefabricate provision stage 41 in order to process and finish them according to predetermined prescription data.

[0050] When an order for the production of an individualised spectacle lens is placed by means of an ordering system, the product code 43 of a suitable spectacle lens prefabricate 12 available at the spectacle lens prefabricate provision stage 41 is provided by means of a computer unit 42. A person working in the prescription data production stage 19 can then take a spectacle lens prefabricate 12 corresponding to the product code 43 from the spectacle lens prefabricate provision stage 41 and transfer it to a process input stage 44 on a process section P3, wherein the computer unit 42 provides the prescription data for the individualized spectacle lens for linking with the spectacle lens prefabricate 12 by a calculation engine 45 in the calculation section 16.

[0051] In the calculation section 16 of the production process 10, surfacing and / or shaping data for a surfacing and / or shaping process in the processing section 18 of the prescription data production stage 19 is then determ ined for the spectacle lens prefabricate 12 on the basis of the prescription data provided in a process step 46 by means of a calculation engine 45. The shaping process is used to define the geometry of the spectacle lens prefabricate 12 processed into an individualized spectacle lens.

[0052] The calculation engine 45 uses a calculation rule for the prescription data and the geometry of the spectacle lens prefabricate 12 to calculate the spectacle lens so that it is as thin and smooth as possible in order to meet the aesthetic requirements of spectacle wearers.

[0053] It should be noted that the production steps for a spectacle lens customized using prescription data are particularly stable if the processing of a spectacle lens prefabricate 12 only requires a small amount of material to be removed and the diameter of the spectacle lens prefabricate 12 is as large as possible.

[0054] Then, in a process step 48, the quality information assigned to the semi-finished spectacle lens is utilized to check whether the semi-finished spectacle lens to be processed can be shaped in accordance with the shaping data and then meets a specified quality standard.

[0055] Fig. 4 shows a spectacle lens prefabricate 12 with an outer edge area 50. To check the specified quality standard, it is determined in process step 48 whether the shaping data describe a semi-finished spectacle lens for which an oversize edge area 52 of the spectacle lens prefabricate 12 is removed, which has an inward oversize relative to the outer edge area 50. The vertical projection of the edge area of the spectacle lens prefabricate 12 has the shape of a circular ring. This circular ring has an outer circle 54, which coincides with an outer edge 56 of the spectacle lens prefabricate 12, and an inner circle 58, the radius ri of which satisfies the following relationship with the radius ra of the outer circle 50: ra - ri < 4 mm, preferably ra - ri = 4 mm. The oversize edge area also has a circular ring shape with an inner circle 58 whose radius r satisfies the following relation: ri - r > 1 mm, where ri is the radius of the inner circle of the circular ring.

[0056] A spectacle lens prefabricate 12 with the quality information A passes through process step 48 to process section P4.

[0057] If a spectacle lens prefabricate 12 is assigned the quality information B, it is only subjected to a surfacing and / or shaping process for a surfacing and / or shaping corresponding to the surfacing and / or shaping data for the production of a semi-finished spectacle lens product on a process section P5 if the comparison with the quality information assigned to the spectacle lens prefabricate 12 has shown that a semi-finished spectacle lens produced from the spectacle lens prefabricate 12 satisfies the specified quality standard.

[0058] If the comparison with the quality information assigned to the spectacle lens prefabricate 12 shows that a semi-finished spectacle lens product manufactured from the spectacle lens prefabricate 12 does not meet the specified quality standard, the spectacle lens prefabricate 12 is returned to the spectacle lens prefabricate preparation stage 14.

[0059] The computer unit 42 as a program memory in which a computer program is loaded which is adapted to assigning quality information to a spectacle lens prefabricate 12 and to process spectacle lens prefabricate quality information from the group "Quality information A: Spectacle lens prefabricate has no defect", "Quality information B: Spectacle lens prefabricate has a defect in an outer edge area and has no defect in an inner area complementary to the outer edge area, "Quality information C: Spectacle lens prefabricate has a defect in an inner area complementary to the outer edge area". This computer program is further adapted to link a spectacle lens prefabricate 12, to which the quality information B is assigned, with prescription data in the calculation engine 45 in order to generate shaping data for the spectacle lens prefabricate 12, wherein the generated shaping data is compared with the quality information B in order to determine whether a semi-finished spectacle lens product can be produced from the semi-finished spectacle lens product which has a shaping corresponding to the shaping data and which satisfies a predetermined quality standard. For checking the predetermined quality standard, the computer program is adapted to determine whether the shaping data describe a semi-finished spectacle lens product for which an oversize edge area of the spectacle lens prefabricate 12 is removed which has an oversize towards the inside in relation to the outer edge area. Fig. 5 shows a third process flow diagram for the prescription data production stage 19 of the process with the processing section 18. In the processing section 18, the spectacle lens prefabricate 12 is machined on the process section P5 in a processing station 60 by means of milling and grinding as well as polishing in order to give the spectacle lens prefabricate 12 the shape corresponding to the shaping data. Here, the spectacle lens prefabricate 12 is processed to give it a predetermined centering shape, whereby the defects in the edge area of the spectacle lens prefabricates 12 corresponding to the quality information B are all removed.

[0060] On the process section P5, the machined spectacle lens prefabricate 12 is then coated in a coating station 62. Here, the machined spectacle lens prefabricate 12 is given a hard coating, an anti-reflective coating or a coating against dirt, for example.

[0061] The spectacle lens prefabricate 12 can then, if necessary, be edged in a mould edging station 64 on the process section P5 in order to provide a spectacle lens individualized in this way for an end customer by means of prescription data.

[0062] To summarize, the following preferred features of the invention should be noted in particular: The invention relates to methods for producing a spectacle lens individualised by prescription data from a spectacle lens prefabricate 12 in a production process 10, which comprises the following steps:

[0063] Providing spectacle lens prefabricates 12 and qualifying the spectacle lens prefabricates 12 by checking for the presence of a defect, and further treatment of the spectacle lens prefabricates 12 in the production process 10 depending on quality information assigned to the spectacle lens prefabricates 12 during qualification. The quality information is quality information from the group "Quality information A: Spectacle lens prefabricate has no defect", "Quality information B: Spectacle lens prefabricate has a defect in an outer edge area and has no defect in an inner area complementary to the outer edge area", "Quality information C: Spectacle lens prefabricate has a defect in an inner area complementary to the outer edge area".

[0064] A spectacle lens prefabricate 12, to which the quality information B is assigned, is linked with prescription data in a calculation engine 45 in order to generate shaping data for the spectacle lens prefabricate 12, wherein the generated shaping data is compared with the quality information B in order to determine whether a semi-finished spectacle lens product can be produced from the spectacle lens prefabricate 12 which has a shaping corresponding to the shaping data and which satisfies a predetermined quality standard.

[0065] For checking the predetermined quality standard, it is determined whether the shaping data describe a semi-finished spectacle lens product for which an oversize edge area of the spectacle lens prefabricate 12 is removed which has an oversize towards the inside in relation to the outer edge area.

[0066] The invention relates in particular to the following aspects:

[0067] 1 . Method for producing a spectacle lens individualised by prescription data from a spectacle lens prefabricated product (12) in a production process (10), which comprises the following steps:

[0068] Providing ophthalmic lens prefabricated parts (12) and qualifying the ophthalmic lens prefabricated parts (12) by checking for the presence of a defect, Further treatment of the ophthalmic lens prefabricates (12) in the production process (10) as a function of quality information assigned to the ophthalmic lens prefabricates (12) during qualification, characterized in that the quality information is quality information from the group "Quality information A: Spectacle lens prefabrication has no defect", "Quality information B: Spectacle lens prefabrication has a defect in an outer edge area and has no defect in an inner area complementary to the outer edge area", "Quality information C: Spectacle lens prefabrication has a defect in an inner area complementary to the outer edge area". Method according to aspect 1 , characterized in that spectacle lens prefabricates (12) to which the quality information C is assigned are rejected from the production process (10). Method according to aspect 1 or aspect 2, characterized in that ophthalmic lens prefabricated products (12) to which the quality information A or B is assigned are packaged, the quality information A or B being stored on a storage medium which is connected to the packaging or integrated into the packaging or which is connected to or integrated into the ophthalmic lens prefabricated products (12). Method according to one of aspects 1 to 3, characterized in that a spectacle lens prefabricate (12), to which the quality information B is assigned, is linked with prescription data in a calculation engine (45) in order to generate shaping data for the spectacle lens prefabricate (12), wherein the generated shaping data is compared with the quality information B in order to determine whether a semi-finished spectacle lens product can be produced from the semi-finished spectacle lens product (12) which has a shaping corresponding to the shaping data and which satisfies a predetermined quality standard. Method according to aspect 4, characterized in that, for checking the predetermined quality standard, it is determined whether the shaping data describe a semi-finished ophthalmic lens product for which an oversize edge region of the ophthalmic lens pre-product (12) is removed which has an oversize towards the inside in relation to the outer edge region. Method according to aspect 5, characterized in that the vertical projection of the edge region of the ophthalmic lens preform (12) has a ring shape. Method according to aspect 6, characterized in that the vertical projection of the edge region of the ophthalmic lens preform (12) is a circular ring. Method according to aspect 7, characterized in that the circular ring has an outer circle which coincides with an outer edge of the spectacle lens prefabrication (12). Method according to aspect 8, characterized in that the circular ring has an inner circle (58) which radius ri with the radius ra of the outer circle satisfies the following relationship: ra - ri < 4 mm, preferably ra - ri = 4 mm or ra - ri < 3 mm, preferably ra - ri = 2 mm or ra - ri < 8 mm, preferably ra - ri = 7 mm. The method according to aspect 9, characterized in that the oversize edge region has a circular ring shape with an inner circle (58) which radius r satisfies the following relation: ri - r > 1 mm, where ri is the radius of the inner circle (58) of the circular ring. Method according to one of aspects 4 to 10, characterized in that the ophthalmic lens prefabricate (12) is only subjected to a shaping process for a shaping corresponding to the shaping data for the production of an ophthalmic lens semi-finished product if the comparison with the quality information assigned to the ophthalmic lens has shown that an ophthalmic lens semi-finished product produced from the ophthalmic lens prefabricate (12) satisfies the predetermined quality standard. Method according to aspect 11 , characterized in that the semi-finished ophthalmic lens product produced in the shaping process is inspected for defects. Method according to aspect 11 or 12, characterized in that the semifinished ophthalmic lens product passes the surfacing and / or shaping process before coating. Method according to aspect 13, characterized in that the semi-finished spectacle lens product is edged after coating for mounting in a spectacle frame. Computer program for qualifying spectacle lens prefabricates (12) by means of image evaluation in a method according to one of aspects 1 to 14 for producing a spectacle lens individualised by prescription data from a spectacle lens prefabricate (12) in a production process (10) by assigning quality information to a spectacle lens prefabricate (12), characterized in that the quality information is quality information from the group "Quality information A: Spectacle lens prefabrication has no defect", "Quality information B: Spectacle lens prefabrication has a defect in an outer edge area and has no defect in an inner area complementary to the outer edge area", "Quality information C: Spectacle lens prefabrication has a defect in an inner area complementary to the outer edge area". List of reference symbols:

[0069] 10 production process

[0070] 12 spectacle lens prefabricate

[0071] 14 preparation stage

[0072] 15 order processing section

[0073] 16 calculation section

[0074] 18 processing section

[0075] 19 prescription data production stage

[0076] 20 process step

[0077] 22 mould shells

[0078] 24 process step

[0079] 26 process step

[0080] 28 process step

[0081] 30 process step

[0082] 32 process step

[0083] 34 warehouse

[0084] 35 process step

[0085] 37 waste station

[0086] 40 warehouse

[0087] 41 spectacle lens prefabricate provision stage

[0088] 42 computer unit

[0089] 43 product code

[0090] 44 process input stage

[0091] 45 calculation engine

[0092] 46 process step

[0093] 48 process step

[0094] 50 margin

[0095] 52 oversize edge area

[0096] 54 outside circle

[0097] 56 outer edge

[0098] 58 inner circle processing station coating station mould edging station

Claims

Claims1 . Method for producing a spectacle lens individualised by prescription data from a spectacle lens prefabricate (12) in a production process (10), which comprises the following steps:Providing spectacle lens prefabricates (12) and qualifying the spectacle lens prefabricates (12) by checking for the presence of a defect, further treatment of the spectacle lens prefabricates (12) in the production process (10) as a function of quality information assigned to the spectacle lens prefabricates (12) during qualification, wherein the quality information is quality information from the group "Quality information A: Spectacle lens prefabricate has no defect", "Quality information B: Spectacle lens prefabricate has a defect in an outer edge area and has no defect in an inner area complementary to the outer edge area", "Quality information C: Spectacle lens prefabricate has a defect in an inner area complementary to the outer edge area", and wherein a spectacle lens prefabricate (12), to which the quality information B is assigned, is linked with prescription data in a calculation engine (45) in order to generate shaping data for the spectacle lens prefabricate (12), wherein the generated shaping data is compared with the quality information B in order to determine whether a semi-finished spectacle lens product can be produced from the spectacle lens prefabricate (12) which has a shaping corresponding to the shaping data and which satisfies a predetermined quality standard, characterized in that,for checking the predetermined quality standard, it is determined whether the shaping data describe a semi-finished spectacle lens product for which an oversize edge area of the spectacle lens prefabricate (12) is removed which has an oversize towards the inside in relation to the outer edge area.

2. Method according to claim 1 , characterized in that spectacle lens prefabricates (12) to which the quality information C is assigned are rejected from the production process (10).

3. Method according to claim 1 or claim 2, characterized in that spectacle lens prefabricates (12) to which the quality information A or B is assigned are packaged, the quality information A or B being stored on a storage medium which is connected to the packaging or integrated into the packaging or which is connected to or integrated into the spectacle lens prefabricates (12).

4. Method according to one of the claims 1 to 3, characterized in that the vertical projection of the edge area of the spectacle lens prefabricates (12) has a ring shape.

5. Method according to claim 4, characterized in that the vertical projection of the edge area of the spectacle lens prefabricate (12) is a circular ring.

6. Method according to claim 5, characterized in that the circular ring has an outer circle which coincides with an outer edge of the spectacle lens prefabricate (12).

7. Method according to claim 6, characterized in that the circular ring has an inner circle (58) which radius ri with the radius ra of the outer circle satisfies the following relationship: ra - ri < 4 mm, preferably ra - ri = 4 mm or ra - ri < 3 mm, preferably ra - ri = 2 mm or ra - ri < 8 mm, preferably ra - ri = 7 mm.

8. The method according to claim 7, characterized in that the oversize edge area has a circular ring shape with an inner circle (58) which radius r satisfies the following relation: ri - r > 1 mm, where ri is the radius of the inner circle of the circular ring.

9. Method according to one of claims 1 to 8, characterized in that the spectacle lens prefabricate (12) is only subjected to a shaping process for a shaping corresponding to the shaping data for the production of a spectacle lens semi-finished product if the comparison with the quality information assigned to the spectacle lens has shown that a spectacle lens semi-finished product produced from the spectacle lens prefabricate (12) satisfies the predetermined quality standard.

10. Method according to claim 9, characterized in that the semi-finished spectacle lens product produced in the shaping process is inspected for defects.

11. Method according to claim 9 or 10, characterized in that the semi-finished spectacle lens product passes the surfacing and / or shaping process before coating.

12. Method according to claim 11 , characterized in that the semi-finished spectacle lens product is edged after coating for mounting in a spectacle frame.

13. Computer program for use in a method according to one of claims 1 to 12 for producing a spectacle lens individualized by prescription data from a spectacle lens prefabricate (12) in a production process (10), the computer program being adapted to assigning quality information to a spectacle lens prefabricate (12) and to process spectacle lens prefabricate quality information from the group "Quality information A: Spectacle lens prefabricate has no defect", "Quality information B: Spectacle lensprefabricate has a defect in an outer edge area and has no defect in an inner area complementary to the outer edge area, "Quality information C: Spectacle lens prefabricate has a defect in an inner area complementary to the outer edge area", the computer program further being adapted to link a spectacle lens prefabricate (12), to which the quality information B is assigned, with prescription data in a calculation engine (45) in order to generate shaping data for the spectacle lens prefabricate (12), wherein the generated shaping data is compared with the quality information B in order to determine whether a semi-finished spectacle lens product can be produced from the semi-finished spectacle lens product (12) which has a shaping corresponding to the shaping data and which satisfies a predetermined quality standard, characterized in that, for checking the predetermined quality standard, the computer program is adapted to determine whether the shaping data describe a semi-finished spectacle lens product for which an oversize edge area of the spectacle lens prefabricate (12) is removed which has an oversize towards the inside in relation to the outer edge area.

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