Method for compensating for position errors during the edging process or during the fixing of a finished spectacle lens with a raw edge and device therefor

Abstract

The subject of the invention is a method for compensating for position errors during the edging process or during the fixing process of a raw-edged finished spectacle lens, the method comprising: - determining a centering deviation parameter, wherein the centering deviation parameter is indicative of the occurrence of a position error of the raw-edged finished spectacle lens during the fixing process and / or during a subsequent edging process; - changing control information by means of the determined centering deviation parameter so that the position error of the raw-edged finished spectacle lens is compensated for and / or taken into account. Furthermore, the subject of the invention is a corresponding device.

Description

Technical Field

[0001] This invention relates to a method and apparatus for compensating for positional errors during the trimming or fixing process of finished spectacle lenses with rough edges. Background Technology

[0002] As is known in the prior art, in order to trim the rough edges of finished eyeglass lenses, the lenses are clamped or locked and then ground into a frame shape using tools (milling and / or grinding). This process is also known as grinding, trimming, or edge finishing.

[0003] For processing, the eyeglass lenses can be clamped without locking, or secured by one or more locking elements and / or adhesive pads. Milling or grinding tools are used for edge finishing, by which the lenses are ground or milled into a frame shape. To control the tools, centering data and shape data are used, which preset coordinates and shapes for the trimming process.

[0004] In this case, deviations can occur during the grinding process, for example, due to geometric effects, such as the tilting of the lens during locking or clamping.

[0005] However, this method cannot be used on particularly smooth lens surfaces, as the lens may slip out of its holding or locking position. Incorrect lens positioning can lead to incorrect edge finishing in subsequent steps, such as trimming. Summary of the Invention

[0006] The object of the present invention is to provide a method suitable for taking into account or compensating for positional errors of a lens, so that the lens can be trimmed into a desired shape.

[0007] The objective is achieved by means of the method according to the main claim and the apparatus according to the parallel claims.

[0008] The invention will now be described in more detail (with reference to the accompanying drawings). It should be noted that different aspects are described herein, and these aspects can be used individually or in combination. That is, any aspect can be used with different embodiments of the invention unless explicitly described as a purely alternative.

[0009] Furthermore, for simplicity, only one entity will generally be referred to below. However, the invention can also have multiple related entities, unless otherwise explicitly stated. In this regard, the use of the terms "a," "an," and "an" is understood to simply indicate the use of at least one entity in a simple embodiment.

[0010] If the methods are described below, the steps of the methods can be set up and / or combined in any order, unless the relationship explicitly leads to a difference. Furthermore, the methods—unless otherwise explicitly stated—can be combined with each other.

[0011] Numerical descriptions should not be interpreted as exact values, but also include tolerances of + / -1% to + / -10%.

[0012] References to standards, specifications, or norms should be understood as applicable on the date of application and / or the date of priority claim (if priority is claimed). However, this should not be construed as a general exclusion of the applicability of any subsequent or alternative standards, specifications, or norms.

[0013] In the following text, "adjacent" explicitly includes, but is not limited to, a relationship of immediate proximity. In the following text, "between" explicitly includes locations where the portion located between is immediately adjacent to the surrounding portion.

[0014] A method for compensating for positional errors during the trimming or fixing process of a finished spectacle lens with a rough edge, exemplarily comprising the following steps: determining a centering deviation parameter. Here, the centering deviation parameter indicates the movement of the finished spectacle lens with a rough edge (during the (mechanical) fixing process). Such movement results in positional errors. The (mechanical) fixing process, taking into account the determined centering deviation parameter, can proceed in a manner that compensates for the movement of the finished spectacle lens with a rough edge. At the end of the mechanical fixing process, the finished spectacle lens with a rough edge can be fixed in a way that prevents further movement of the finished spectacle lens with a rough edge during a subsequent (grinding) process. For example, control information can be changed in another step. The control information can be changed, taking into account the determined centering deviation parameter, to compensate for or account for the positional errors of the finished spectacle lens with a rough edge.

[0015] This has the following advantages: even with a highly smooth surface, the lens can be properly reprocessed, such as ground or trimmed, at low cost and quickly.

[0016] A device suitable for fixing and / or compensating for positional errors in finished spectacle lenses with burrs, such as a device for a grinding / trimming process of finished spectacle lenses with burrs, exemplarily includes: a determining mechanism for determining a (centering) deviation parameter. Furthermore, the device can have a fixing mechanism for fixing the finished spectacle lenses with burrs, such that the finished spectacle lenses with burrs can be prevented from continuing to move during a subsequent (grinding) process. Furthermore, the device can have a control mechanism for changing control information based on the determined (centering) deviation parameter, wherein the (centering) deviation parameter indicates a positional error in the finished spectacle lenses with burrs that occurs during the fixing process and / or during a subsequent trimming process. Furthermore, the device can have a fixing mechanism for initiating a mechanical fixing process of the finished spectacle lenses with burrs by means of a fixing mechanism based on the determined centering deviation parameter, wherein the centering deviation parameter indicates movement of the finished spectacle lenses with burrs during the mechanical fixing process, and the mechanical fixing process is performed taking into account the determined centering deviation parameter in order to compensate for the movement of the finished spectacle lenses with burrs. In addition, the device can have a control unit for transmitting control information, based on which a fixing process and / or a subsequent trimming process can be performed to compensate for or account for positional errors in the finished eyeglass lens with rough edges.

[0017] This has the following advantages: even with a highly smooth surface, the lens can be properly ground / trimmed quickly and at low cost.

[0018] According to the first exemplary design, the method further comprises: the movement of the finished spectacle lens with rough edges during the mechanical fixing process is caused by the mechanical fixing process, especially until the mechanical fixing process ends.

[0019] This design has the following advantages: because it makes full use of the state that the movement of the lens only begins when the chuck physically contacts or is about to contact the lens, the computational cost is reduced.

[0020] According to the first exemplary design, the method further includes the following: the positional error of the finished eyeglass lens with rough edges is caused by the fixing process and / or the subsequent trimming process.

[0021] This design has the following advantages: because it takes full advantage of the fact that lens positional error only occurs when the lens is in physical contact with the chuck and / or the trimming tool, the required determination costs are less, and the positional error can be fully compensated for or accounted for.

[0022] According to another exemplary design, the method further includes: the movement of the finished spectacle lens with rough edges during the mechanical fixing process includes the movement and / or rotation of the finished spectacle lens with rough edges.

[0023] This design has the following advantages: because it makes full use of the following state: the lens is placed on the disk, thus having fewer degrees of freedom for the movement of the lens, so less computation is required.

[0024] According to another exemplary design, the method further includes: the occurrence of positional error in the finished spectacle lens with rough edges includes: movement and / or rotation of the finished spectacle lens with rough edges during the fixing process and / or in the subsequent trimming process.

[0025] This design has the following advantages: because it makes full use of the following states, the corresponding (centering) deviation can be easily determined, so the required determination cost will be less.

[0026] According to another exemplary design, the method further includes: compensating for the movement of the finished spectacle lens with rough edges during the mechanical fixing process by: changing the location of a predetermined fixing point on the finished spectacle lens with rough edges at the end of the mechanical fixing process.

[0027] This design has the following advantages: by determining a new holding point for the lens, i.e., a fixed point for the lens after movement, which corresponds in location to the original fixed point on the lens, the centering data up to the present can be continued, thereby further reducing computational costs.

[0028] According to another exemplary design, the method further includes: determining the centering deviation parameter includes reading in a predetermined centering deviation parameter.

[0029] The design scheme has the following advantages: it can determine the centering deviation parameters with minimal cost.

[0030] According to another exemplary design, the method further includes: compensating for the movement of the finished spectacle lens with rough edges during the mechanical fixing process by: changing a predetermined fixing point on the finished spectacle lens with rough edges at the location at the start of the mechanical fixing process, such that the predetermined fixing point is changed so that the finished spectacle lens with rough edges is fixed at an alternative fixing point, at which the movement of the finished spectacle lens with rough edges during the mechanical fixing process is minimized.

[0031] This design has the following advantages: it can continue to use the centering data so far, thereby further reducing computational costs.

[0032] According to another exemplary design, the method further includes: changing the control information by: changing the location of a predetermined fixing point on the finished eyeglass lens with a rough edge, such that the predetermined fixing point is changed to fix the finished eyeglass lens with a rough edge on an alternative fixing point, at which the occurrence of positional error of the finished eyeglass lens with a rough edge is minimized during the fixing process and / or the subsequent trimming process.

[0033] This design has the following advantages: the original centering and / or shape data can be used for subsequent trimming processes, thereby minimizing determination costs.

[0034] According to another exemplary design, the method further includes: determining the centering deviation parameter by reading a predetermined centering deviation parameter.

[0035] The design has the following advantages: it can implement the fixation method very quickly and has low computational cost during the fixation process.

[0036] According to another exemplary design, the method further includes: determining the centering deviation parameter by reading and / or determining centering data and / or shape data for corresponding modifications to the subsequent trimming process.

[0037] This design has the following advantages: it enables the modification of control information with minimal cost.

[0038] According to another exemplary design, the method further includes: determining the centering deviation parameter by reading and / or determining centering data for corresponding modifications to the subsequent grinding process.

[0039] This design offers the following advantages: it allows for the re-determination of centering data, enabling increased flexibility even when the motion is not fully understood, thus allowing for continued precise grinding.

[0040] According to another exemplary design, the method further comprises: determining the centering deviation parameter based on the positional error of the finished eyeglass lens, which is tactilely identified as having rough edges, during the fixing process and / or during the subsequent shaping process.

[0041] This design has the following advantages: it can compensate for or account for positional errors that occur during the fixing process and / or during the subsequent trimming process in a personalized or precise manner.

[0042] According to another exemplary design, the method further comprises: determining the centering deviation parameter based on the movement of the finished eyeglass lens, which is tactilely defined as having rough edges, during the mechanical fixing process.

[0043] This design has the following advantages: it enables personalized and precise movement during a fixed process.

[0044] According to another exemplary design, the method further comprises: determining the centering deviation parameter based on the determination of a position error, the determination of the position error being achieved by determining the position of at least one engraved portion on the finished spectacle lens with rough edges during the fixing process and / or during the subsequent trimming process.

[0045] This design has the following advantages: it can compensate for or account for positional errors that occur during the fixing process and / or during the subsequent trimming process in a personalized or precise manner.

[0046] According to another exemplary design, the method further includes: determining the centering deviation parameter based on measurements of the movement of at least one engraved portion on the finished spectacle lens with rough edges during the mechanical fixing process.

[0047] This design has the following advantages: it enables personalized and precise movement during a fixed process.

[0048] According to another exemplary design, the method further includes: changing control information to additionally fix the rough edges of the finished eyeglass lens, such that positional errors are minimized or completely prevented from occurring during the initial fixing process and / or the subsequent trimming process.

[0049] This design has the following advantages: it can prevent positional errors during the fixing process and / or during the subsequent trimming process, thereby enabling more precise trimming of the lens.

[0050] Finished spectacle lenses with rough edges can be conventionally coated here. In some so-called outer coatings, an extremely smooth surface is produced. Super outer coatings with a limited layer thickness, for example, can be 9 nm. This results in a reproducible and exceptionally smooth surface. If such a lens is now clamped, i.e. fixed, by means of a conventional commercially available lockless grinder, the smooth lens surface will cause the lens to move out of the holding position. To hold / clamp the lens, the lens is placed on a disc in a defined orientation in the grinder in a horizontal manner. By means of a vacuum suction device, the lens is sucked from above and lifted from the disc. For mechanical fixation, a so-called chuck approaches from the underside of the lens, so that the lens is pressed in the holding position along the vertical direction and thus ideally fixed. Due to the existing optical action of the lens and / or due to the interaction of the optical action with the current eccentricity, and often due to the curvature of the lens, a wedge, i.e., a geometric prism, is present in the holding point. By applying a force (orthogonally) to the wedge during the pressing process, a lens, especially one with an (extremely) smooth surface, can be pressed out of its holding position (e.g., in a horizontal plane). The force applied to the wedge during pressing can be orthogonal, substantially orthogonal, or non-orthogonal relative to the sides of the wedge. The resulting force can press the lens out of its holding position. The direction of pressing the lens can be, for example, in a horizontal plane, but is not limited thereto. The manifestation of this movement is related to the thickness of the prism present at the holding point, and can also be related to the type of lens, such as the positive or negative action and clamping force in the lens, the material properties of the lens—e.g., mechanical hardness, the refractive index of the lens, the surface properties of the lens, and / or the characteristics of the lens housing of the grinding machine.

[0051] A prism existing at a holding point can be described by components P_hor and P_ver, representing the thickness of the prism in the x or y direction, respectively. See [reference needed]. Figure 1cSimilarly, deviations from the desired centering data in the x and y directions and possible deviations from the axis position that occur during the grinding / trimming process can be described and measured separately; these deviations are collectively referred to as centering deviations. To compensate for these centering deviations, the prism at the holding point can be calculated, for example, in the first step. This can be done using a calculation tool. The extension of the chuck, i.e., the contact surface of the chuck at the lens's holding point, can be considered, and the prism can be calculated via this extension. In the next step, the centering deviations occurring during the grinding / trimming process, such as movement and / or rotation, can be systematically determined (e.g., calculated) for different (any) prisms. This can be done by trimming the finished spectacle lens with suitable optical action and drawing appropriate conclusions from the measurement of the centering deviations. Thus, from now on, the positional errors of the lens that occur during fixing and / or subsequent trimming, such as undesirable movement of the lens (at the holding point), i.e., movement and / or rotation, can be determined. Centering deviations are related to P_hor and P_ver when the grinding machine's process parameters are appropriate. Therefore, with sufficient knowledge of this relationship, the holding position can be adjusted / changed with respect to the control information, allowing for the corresponding compensation or consideration of anticipated positional errors (e.g., caused by movement) during fixing and / or subsequent trimming processes. The actual positional error—i.e., the actual movement of the lens—can also be determined by a suitable method, enabling the modification of the control information for personalized lenses, thereby improving the accuracy of compensation or consideration of positional errors. The control information can be, for example, centering data and / or shape data, transmitted to the grinding machine for the trimming process, and describing, for example, the shape of the centering and / or edge processing. Furthermore, the control information can be, for example, a holding position in which the lens is fixed. Thus, as described above, by adjusting the control information, misalignment of the lens during the fixing process and / or during the trimming process can be appropriately compensated for or considered. Possible tilting of the lens can also be compensated for using this method. Therefore, compensatory movement and / or rotation of the holding position can be performed corresponding to the actual movement of the lens during the fixing process.

[0052] This method can also be used to compensate for lens tilt.

[0053] Because it can calculate the prism at the holding point for any surface geometry, this method can also be applied to any surface geometry of the lens.

[0054] Therefore, it is possible to improve the scrap rate with respect to grinding errors, such as centering deviations outside the allowable tolerances—for example, deviations in centering data in the x and / or y directions and / or rotations of the shaft position, the latter also known as shaft rotations—thereby saving costs and shortening delivery time.

[0055] Compensation for or consideration of positional errors, such as lens movement during the fixing process, can also be achieved by determining alternative holding points, in which the prism should be small enough to minimize or completely prevent lens movement. This allows the use of control information that remains unchanged for the trimming process.

[0056] Compensation or consideration of lens positional errors during the fixing process can also be achieved by determining alternative holding points, which are selected such that the lens slides or presses into the initially intended holding position. This allows the use of control information that remains unchanged for the trimming process.

[0057] Alternatively, it is feasible to apply tactile measurements to observe / measure the positional error, such as movement, of the lens during the fixing process and / or the subsequent trimming process, and to adjust control data (or centering data) accordingly, for example, to enable the lens to continue to be ground / trimmed correctly or more precisely.

[0058] Positional errors (e.g., motion) can also be determined by optical measurements, such as by a vertex refractive index meter (examiner) or by functional engraving applied to the lens.

[0059] Compensation for or consideration of positional errors of the lens during the fixing process can also be achieved by temporary additional fixing—e.g., mechanical means—to minimize or completely prevent positional errors from occurring during the fixing process and / or during the subsequent trimming process. This allows the use of control information that remains unchanged for the trimming process. Detailed Implementation

[0060] exist Figures 1a to 1c In the diagram, a schematic view of centering correction can be seen. Here, in Figure 1a and 1b The finished eyeglass lens with a rough edge is shown as a circular outline (solid line). The desired edged lens is illustrated with respect to its outline as the corresponding portion shown in white. If a positional change occurs, shown as the displacement from the desired centering point to the uncorrected centering point, then the finished eyeglass lens with a rough edge moves to an uncentered position, which is shown as a circular outline filled with dashed lines. That is, if the edging process is performed now, the edged lens would be unusable with such a large deviation as shown. To overcome this, as in... Figure 1b As shown, the centering point or centering data is corrected so that the finished eyeglass lens with rough edges can still be properly trimmed despite changes in position.

[0061] from Figure 2a and2b The changes in control information can be observed.

[0062] exist Figure 2a The diagram first shows the unchanged control information for the trimming process of a finished spectacle lens with a rough edge, without considering positional errors. The finished spectacle lens 1 with a rough edge and the control information 3 (in this example, the centering point and shape for the trimming process) in the same reference system 2 are described here.

[0063] Positional errors during the fixing process of the finished spectacle lens with rough edges and / or during the subsequent trimming process can cause a displacement 4 of the spectacle lens relative to the desired position, as illustrated here by a finished spectacle lens with rough edges and a positional error 5. Without determining changes to the centering deviation parameters and control information, the control information continues to relate to the reference system 2 of the unmoved spectacle lens 1, thus the positional error is not compensated.

[0064] In this example, the original control information 3 (i.e., the centering point and shape of the original reference system 2) is used during trimming, which results in an erroneous grinding result shape 3 (the erroneous centering point position and shape on the lens) due to position error 5 for the moved lens.

[0065] exist Figure 2b The diagram illustrates the control information for the alteration of the finishing process of the finished spectacle lens with burrs when considering positional errors. The finished spectacle lens 1 with burrs and the control information 3 in the same (x, y) reference system 2 are described again here (in this example, the centering point (x, y) and shape (x, y) for the finishing process).

[0066] Positional errors during the fixing process of the finished spectacle lens with rough edges and / or during the subsequent trimming process of the finished spectacle lens with rough edges can cause a displacement 4 of the spectacle lens relative to the desired position, as shown here by a finished spectacle lens with rough edges having a positional error 5.

[0067] As previously mentioned, it is now possible to modify the control information by determining the centering deviation parameter, thereby enabling the compensation or consideration of positional errors in finished eyeglass lenses with rough edges.

[0068] In this example, the centering deviation parameter 8 is the displacement 4 of the finished spectacle lens with a rough edge in the (x, y) reference system. In this example, the change in control information includes a translation 8 (x→x', y→y') of the centering point and correspondingly a translation of the shape (x→x', y→y'). ​​The changed control information 6 is moved relative to the original (x, y) reference system 2, or is fixed in location in the moved (x', y') reference system 7.

[0069] In this example, the displacement is compensated by using control information for changes in the trimming process, thereby producing the correct grinding result shape 6 (correct centering point position and shape on the lens) for the moved lens despite the position error 5.

[0070] In this example, the displacement is compensated by using control information for changes in the trimming process, thereby producing the correct grinding result shape 6 (correct centering point position and shape on the lens) for the moved lens despite the position error 5.

[0071] Figure 3A shows the measurement results of the horizontal centering deviation without considering positional errors, while Figure 3B shows the measurement results of the horizontal centering deviation with considering positional errors. Here, after the trimming process, the centering deviation of the finished spectacle lens with rough edges is shown in relation to the prism at the holding point. Lenses with centering deviations outside the tolerance limits are considered defective. In Figure 3A, positional errors are not considered, as shown regarding... Figure 2a As described. Positional errors are considered in Figure 3B, as per [the description of positional errors]. Figure 2b As described. Taking positional errors into account, the scrap rate was significantly reduced (specifically, the x-deviation was 0% overall in both tests).

[0072] Figure 4A shows the measurement results of vertical centering deviation without considering positional errors, while Figure 3B shows the measurement results of vertical centering deviation with considering positional errors. After the trimming process, the centering deviation of the finished spectacle lens with rough edges is shown in relation to the prism at the holding point. Lenses with centering deviations outside the tolerance limits are considered defective. In Figure 4A, positional errors are not considered, as shown regarding... Figure 2a As described. Positional errors are considered in Figure 4B, as per [the description of positional errors]. Figure 2b As described. Taking positional errors into account, the scrap rate was significantly reduced (specifically, the overall y-deviation was 2.7% in both tests).

[0073] exist Figure 5 The example illustrates the good / bad rates of two representative tests. For both tests, finished eyeglass lenses with similar rough edges are trimmed. For test A (… Figure 5 (Left side), positional errors not considered, such as regarding Figure 2a As described, a high scrap rate (27%) exists. For test B / Figure 5 (Right side), taking positional errors into account, such as regarding Figure 2b As described, the scrap rate decreased significantly (2%).

Claims

1. A method for compensating for positional errors during the trimming process of finished spectacle lenses with rough edges, the method comprising: - Determine the centering deviation parameter, wherein the centering deviation parameter indicates the positional error of the finished spectacle lens with the rough edge during the fixing process and the subsequent trimming process, and - By using the determined centering deviation parameter to modify the control information, the positional error of the finished eyeglass lens is compensated for and / or taken into account. Its features are, Due to the existing optical effects of the lens and / or the interaction between the optical effects and the current eccentricity, and due to the curvature of the lens, a wedge-shaped portion, i.e. a geometric prism, exists at the holding point, wherein the geometric prism comprises a vertical portion (P_ver) and a horizontal portion (P_hor), such that the geometric prism enables the determination of the positional error of the lens that occurs during fixing and in the subsequent trimming process, and wherein the determination of the centering deviation parameter includes calculating the prism at the holding point.

2. The method according to claim 1, wherein the positional error of the finished spectacle lens with burrs is caused by the fixing process and / or the subsequent trimming process.

3. The method according to claim 1 or 2, wherein the positional error of the finished spectacle lens with rough edges during the fixing process includes: The rough-edged finished eyeglass lens moves and / or rotates during the fixing process and / or during the subsequent trimming process.

4. The method according to claim 1 or 2, wherein determining the centering deviation parameter includes reading in a predetermined centering deviation parameter.

5. The method according to claim 1 or 2, wherein the change of control information includes changing the location of a predetermined fixing point on the finished spectacle lens with the rough edge.

6. The method according to claim 1 or 2, wherein the change of the control information includes: The predetermined fixing point on the finished spectacle lens with the rough edge is changed in location, such that the predetermined fixing point is changed so that the finished spectacle lens with the rough edge is fixed on an alternative fixing point, at which the occurrence of positional error of the finished spectacle lens with the rough edge during the fixing process and / or the subsequent trimming process is minimized.

7. The method according to claim 1 or 2, wherein the change of the control information includes: Read in and / or determine the centering data and / or shape data for the corresponding modifications used in the subsequent trimming process.

8. The method according to claim 1 or 2, wherein the centering deviation parameter is determined based on the tactile determination of the positional error of the finished spectacle lens with the rough edge during the fixing process and / or during the subsequent trimming process.

9. The method according to claim 1 or 2, wherein the centering deviation parameter is determined based on the determination of a positional error, the determination of the positional error being carried out by means of determining the position of at least one engraved portion on the finished spectacle lens with rough edges during the fixing process and / or during a subsequent trimming process.

10. The method according to claim 1 or 2, wherein the change in the control information causes additional fixing of the finished spectacle lens with the rough edge, thereby minimizing or completely preventing positional errors from occurring during the initial fixing process and / or the subsequent trimming process.

11. The method of claim 1 or 2, wherein determining the centering deviation parameter includes reading in a predetermined centering deviation parameter, wherein the change of control information includes changing the location of a predetermined fixing point on the finished spectacle lens with the rough edge, wherein the change of control information causes additional fixing of the finished spectacle lens with the rough edge, thereby minimizing or completely preventing the occurrence of positional errors during the initial fixing process and / or the subsequent trimming process.

12. The method according to claim 1 or 2, wherein determining the centering deviation parameter includes reading in a predetermined centering deviation parameter, wherein the change in the control information includes: The predetermined fixing point on the finished spectacle lens with the rough edge is changed in location, such that the predetermined fixing point is changed so that the finished spectacle lens with the rough edge is fixed at an alternative fixing point, at which the occurrence of positional error of the finished spectacle lens with the rough edge during the fixing process and / or the subsequent trimming process is minimized, wherein the change of control information causes additional fixing of the finished spectacle lens with the rough edge, thereby minimizing or completely preventing the occurrence of positional error during the initial fixing process and / or the subsequent trimming process.

13. The method according to claim 1 or 2, wherein determining the centering deviation parameter includes reading in a predetermined centering deviation parameter, wherein the change in the control information includes: Read in and / or determine centering data and / or shape data for corresponding modifications to the subsequent trimming process, wherein the change in the control information causes additional fixation of the finished eyeglass lens with the rough edge, thereby minimizing or completely preventing positional errors from occurring during the initial fixation process and / or the subsequent trimming process.

14. The method of claim 1 or 2, wherein the change of control information includes changing the location of a predetermined fixation point on the finished spectacle lens with the rough edge, wherein the centering deviation parameter is determined based on the tactile determination of the positional error of the finished spectacle lens with the rough edge during the fixing process and / or during the subsequent trimming process, wherein the change of control information causes additional fixing of the finished spectacle lens with the rough edge to minimize or completely prevent the occurrence of positional error during the initial fixing process and / or the subsequent trimming process.

15. The method according to claim 1 or 2, wherein the change of the control information includes: A predetermined fixing point on the finished spectacle lens with a rough edge is changed in location, such that the predetermined fixing point is changed so that the finished spectacle lens with a rough edge is fixed at an alternative fixing point, at which the occurrence of positional error of the finished spectacle lens with a rough edge during the fixing process and / or the subsequent trimming process is minimized, wherein the centering deviation parameter is determined based on the tactile determination of the positional error of the finished spectacle lens with a rough edge during the fixing process and / or the subsequent trimming process, wherein the change of control information causes additional fixing of the finished spectacle lens with a rough edge, thereby minimizing or completely preventing the occurrence of positional error during the initial fixing process and / or the subsequent trimming process.

16. The method according to claim 1 or 2, wherein the change of the control information includes: Centering data and / or shape data for corresponding modifications in the subsequent trimming process are read in and / or determined, wherein the centering deviation parameter is determined based on the tactile determination of the positional error of the finished spectacle lens with the rough edge during the fixing process and / or during the subsequent trimming process, wherein the change in the control information causes additional fixing of the finished spectacle lens with the rough edge, thereby minimizing or completely preventing the occurrence of positional error during the initial fixing process and / or the subsequent trimming process.

17. The method of claim 1 or 2, wherein the change of control information comprises changing the location of a predetermined fixing point on the finished spectacle lens with the rough edge, wherein a centering deviation parameter is determined based on a determination of a positional error, the determination of the positional error being carried out by means of determining the position of at least one engraved portion on the finished spectacle lens with the rough edge during the fixing process and / or during a subsequent trimming process, wherein the change of control information causes additional fixing of the finished spectacle lens with the rough edge, such that the occurrence of positional error during the initial fixing process and / or the subsequent trimming process is minimized or completely prevented.

18. The method according to claim 1 or 2, wherein the change of the control information includes: A predetermined fixing point on the finished spectacle lens with a rough edge is changed in location, such that the predetermined fixing point is changed so that the finished spectacle lens with a rough edge is fixed at an alternative fixing point, at which the occurrence of positional error of the finished spectacle lens with a rough edge during the fixing process and / or the subsequent trimming process is minimized, wherein a centering deviation parameter is determined based on the determination of the positional error, the determination of the positional error is carried out by means of determining the position of at least one engraved portion on the finished spectacle lens with a rough edge during the fixing process and / or the subsequent trimming process, wherein the change of control information causes additional fixing of the finished spectacle lens with a rough edge, thereby minimizing or completely preventing the occurrence of positional error during the initial fixing process and / or the subsequent trimming process.

19. The method according to claim 1 or 2, wherein the change of the control information comprises: Centering data and / or shape data for corresponding modifications in subsequent trimming processes are read in and / or determined, wherein a centering deviation parameter is determined based on the determination of positional errors, said determination of positional errors is carried out by means of determining the position of at least one engraved portion on the finished spectacle lens with burrs during said fixing process and / or during the subsequent trimming process, wherein said change in control information causes additional fixing of the finished spectacle lens with burrs, thereby minimizing or completely preventing the occurrence of positional errors during the initial fixing process and / or the subsequent trimming process.

20. An apparatus for compensating for positional errors in finished spectacle lenses with rough edges during the trimming process, for implementing the method according to any one of claims 1 to 19, the apparatus comprising: - Determine the mechanism used to determine the centering deviation parameters. - A control mechanism for modifying control information based on a determined centering deviation parameter, wherein the centering deviation parameter indicates a positional error in the finished spectacle lens with the rough edge during the fixing process and the subsequent trimming process. - A control unit for transmitting the control information and, based on the control information, performing a fixing process and / or a subsequent trimming process to compensate for or account for positional errors in the finished eyeglass lens due to rough edges. Its features are, Due to the existing optical function of the lens and / or due to the interaction of the optical function with the current eccentricity, and due to the curvature of the lens, a wedge-shaped portion, i.e., a geometric prism, exists at the holding point, wherein the geometric prism includes a vertical portion (P_ver) and a horizontal portion (P_hor), such that the geometric prism enables the determination of the positional error of the lens that occurs during fixing and in the subsequent trimming process; wherein the device further includes a chuck for holding the finished spectacle lens with the rough edge substantially centered; and The determining mechanism is configured such that the determination of the centering deviation parameter is based on the prism in the holding point.

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