There is provided a circumference calculating device including an expected shape specifying part 201b configured to obtain an expected finish shape of a bevel in consideration of an interference amount of a beveling tool when beveling is performed to an uncut spectacle lens; and a theoretical circumference calculating part 201d configured to obtain a bevel circumference of the spectacle lens having the expected finish shape obtained by the expected shape specifying part 201b, as a theoretical circumference of this spectacle lens.

There is provided a surfacing station for processing of surfaces of optical elements as workpieces, including a processing unit configured to process surfaces of optical elements; a controller unit configured to communicate with a database containing processing protocols, which can be carried out by the surfacing station, and to control operation of the processing unit in accordance with the processing protocols; and an identification tag base configured to communicate with the controller unit and configured to determine identification tags of consumable items used by the surfacing station, the controller unit being configured to enable a surfacing protocol for processing of the optical elements as workpieces in function of an identified consumable item.

A tool, a device, and a method for zonal polishing of optical workpieces, wherein the tool has a preformed cap for forming a polishing surface, and the tool is placed against the workpiece that is to be polished in such a way that the tilt angle of the axis of rotation of the tool to the normal of the contact surface on the workpiece remains at least essentially constant and/or the size of the contact surface remains at least essentially constant.

A spectacle lens processing device includes a drilling tool and a processor. The processor acquires a position of a hole formed in a lens and a pantoscopic angle. The pantoscopic angle is an angle in a vertical plane between a visual axis of a user and an optical axis of the lens when the user wears spectacles in which the lens after processing is mounted and faces forward. The processor determines, based on the acquired pantoscopic angle, a relative angle between the drilling tool and the lens when the hole is formed in the lens in the position of the hole.

A working machine, in particular a combine harvester, having multiple working elements for carrying out or assisting work, and a driver assistance system for controlling the working elements according to at least one processing strategy which can be specified by the operator and directed to the fulfillment of at least one quality criterion. The driver assistance system has a memory for storing data characterizing the processing strategy, a computing device for processing the data stored in the memory, and a graphical user interface. Competing quality criteria, weighted with respect to each other according to a weighting variable, are incorporated into the processing strategy. The weighting variable is visualized via a virtual control element of the graphical user interface and can be specified by the operator. The driver assistance system registers the strategy selection of the operator, predicts an optimization goal, and presents an optimization proposal for this predicted optimization goal.

A provisional lens structure has a grip tab region that allows the provisional lens structure to be supported and maneuvered, for example during subsequent manufacturing operations to produce a finished lens, thereby reducing the risk of damage to the provisional lens structure as compared to conventional approaches in which the provisional lens is supported and maneuvered directly by the edge of the provisional lens.

A provisional lens structure has a grip tab region that allows the provisional lens structure to be supported and maneuvered, for example during subsequent manufacturing operations to produce a finished lens, thereby reducing the risk of damage to the provisional lens structure as compared to conventional approaches in which the provisional lens is supported and maneuvered directly by the edge of the provisional lens.

A provisional lens structure has a grip tab region that allows the provisional lens structure to be supported and maneuvered, for example during subsequent manufacturing operations to produce a finished lens, thereby reducing the risk of damage to the provisional lens structure as compared to conventional approaches in which the provisional lens is supported and maneuvered directly by the edge of the provisional lens.

A provisional lens structure has a grip tab region that allows the provisional lens structure to be supported and maneuvered, for example during subsequent manufacturing operations to produce a finished lens, thereby reducing the risk of damage to the provisional lens structure as compared to conventional approaches in which the provisional lens is supported and maneuvered directly by the edge of the provisional lens.

The method includes applying glue onto one surface of one component of the tool placed in a support of a first supporting member and/or onto one surface of another component of the tool placed in a support of a second supporting member while the support of the first supporting member and the support of the second supporting member are side by side; then driving the first supporting member and the second supporting member relative to one another to a second position where the support of the first supporting member and the support of the second supporting member are aligned; and then pressing the first supporting member and the second supporting member towards one another for applying onto each other the one surface of the one component and the one surface of the another component.