Determination of an optical lens machining process signature

A system for compensating a signature of an optical lens machining process, the system being configured to:

• determine
• at least two error maps associated respectively with at least two optical lenses machined using the optical lens machining process
• at least one surfacing defect in a first of the at least two error maps,
• at least one surfacing defect in a second of the at least two error maps,
• remove from the first of the at least two error maps the at least one surfacing defect in the first of the at least two error maps to obtain a first updated error map,
• remove from the second of the at least two error maps the at least one surfacing defect in the second of the at least two error maps to obtain a second updated error map,
• determine the signature of the optical lens machining process by averaging at least the first updated error map and the second updated error map,
• wherein the system is further configured to use the signature of the optical lens machining process to adapt the optical lens machining process when used to machine a third optical lens such that a third optical parameter map of the third optical lens is closer to a third target map than what the first optical parameter map is from the first target map or what the second optical parameter map is from the second target map,
• the third optical parameter map comprising values of an optical parameter of the third optical lens at the plurality of the control points, the third target map comprising third target values of the optical parameter at the plurality of the control points.

A method for determining an optical lens machining process signature, the method comprising:

• determining:
• at least two error maps associated respectively with at least two optical lenses machined using the optical lens machining process,
• at least one surfacing defect in a first of the at least two error maps,
• at least one surfacing defect in a second of the at least two error maps,
• removing from the first of the at least two error maps the at least one surfacing defect in the first of the at least two error maps to obtain a first updated error map,
• removing from the second of the at least two error maps the at least one surfacing defect in the second of the at least two error maps to obtain a second updated error map,
• determining the signature of the optical lens machining process by averaging at least the first updated error map and the second updated error map.

A method for compensating a signature of an optical lens machining process, the method comprising:

• machining at least two optical lenses using the optical lens machining process,
• determining the optical lens machining process signature comprising:
• determining
• at least two error maps associated respectively with the at least two optical lenses machined using the optical lens machining process
• at least one surfacing defect in a first of the at least two error maps,
• at least one surfacing defect in a second of the at least two error maps,
• removing from the first of the at least two error maps the at least one surfacing defect in the first of the at least two error maps to obtain a first updated error map,
• removing from the second of the at least two error maps the at least one surfacing defect in the second of the at least two error maps to obtain a second updated error map,
• determining the signature of the optical lens machining process by averaging at least the first updated error map and the second updated error map.
• recording the optical lens machining process signature,
• wherein, the method further comprises:
• using the signature of the optical lens machining process to adapt the optical lens machining process when used to machine a third optical lens such that a third optical parameter map of the third optical lens is closer to a third target map than what the first optical parameter map is from the first target map or what the second optical parameter map is from the second target map,
• the third optical parameter map comprising values of an optical parameter of the third optical lens at the plurality of the control points, the third target map comprising third target values of the optical parameter at the plurality of the control points.

A computer program product comprising one or more stored sequences of instructions that are accessible to a processor and which, when executed by the processor, causes the processor to carry out at the steps of a method for determining a signature of an optical lens machining process, the method comprising:

• determining:
• at least two error maps associated respectively with at least two optical lenses machined using the optical lens machining process
• at least one surfacing defect in a first of the at least two error maps,
• at least one surfacing defect in a second of the at least two error maps,
• removing from the first of the at least two error maps the at least one surfacing defect in the first of the at least two error maps to obtain a first updated error map,
• removing from the second of the at least two error maps the at least one surfacing defect in the second of the at least two error maps to obtain a second updated error map,
• determining the signature of the optical lens machining process by averaging at least the first updated error map and the second updated error map.