Manufacturing method for manufacturing a spectacle lens, spectacle lens and lens design method

The present disclosure relates to manufacturing method (100) of manufacturing a spectacle lens (1), the method comprising the steps of: obtaining prescription data descriptive of an ophthalmic prescription of a user in the plus prescription range (101); obtaining frame data descriptive of a perimete...

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Bibliographische Detailangaben
Hauptverfasser:	ELLINGER, Philipp, GALL, Michael, NOLAN, Angela, SPRATT, Ray Steven
Format:	Patent
Sprache:	eng
Schlagworte:	CONTACT LENSES DRESSING OR CONDITIONING OF ABRADING SURFACES FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS GRINDING MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING OPTICS PERFORMING OPERATIONS PHYSICS POLISHING SPECTACLES SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURESAS SPECTACLES TRANSPORTING
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Beschreibung
Zusammenfassung:	The present disclosure relates to manufacturing method (100) of manufacturing a spectacle lens (1), the method comprising the steps of: obtaining prescription data descriptive of an ophthalmic prescription of a user in the plus prescription range (101); obtaining frame data descriptive of a perimeter of a spectacle frame in which the lens is to be mounted (102); providing a lens blank (5) having a convex front surface (3) and a back surface (4) (103); determining a final cutting surface (7) to be machined on the back surface (4) of the lens blank in a final cutting phase (104); determining an intermediate cutting surface (8) to be machined on the back surface of the lens blank in an initial cutting phase (105), wherein the intermediate cutting surface is different from the final cutting surface; wherein the final cutting surface (7) comprises a prescription zone (32), in which the final cutting surface (7) together with the front surface (3) fulfills the ophthalmic prescription of the user; and wherein a boundary perimeter of the prescription zone encloses the perimeter of the spectacle frame (20); and a non-prescription blending zone (35) surrounding the prescription zone; in which the final cutting surface (7) together with the front surface (3) provides at least a predetermined minimum thickness of the spectacle lens; wherein said intermediate cutting surface (8) is determined based on the final cutting surface (7); wherein a maximum curvature of the intermediate cutting surface is smaller than a maximum curvature of the final cutting surface; and wherein a lens thickness provided by the intermediate cutting surface exceeds a lens thickness provided by the final cutting surface at least within the prescription zone (32); machining said intermediate cutting surface on the back surface of the lens blank in said initial cutting phase (106); and machining said first final cutting surface on the back surface of the lens blank in said final cutting phase (107).