Spectacle lens comprising spherical front side and multi-focal back side and method for its production

The requirements of the spectacles prescription, comprising spherical or astigmatic or prismatic effect and their distribution on the prescription surface of the spectacles lens are fulfilled. The rear surface of the spectacles lens is a multi-focal surface without point or axis symmetry. The convex...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	HOF, ALBRECHT, HANSEN, ADALBERT
Format:	Patent
Sprache:	eng ; fre ; ger
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 requirements of the spectacles prescription, comprising spherical or astigmatic or prismatic effect and their distribution on the prescription surface of the spectacles lens are fulfilled. The rear surface of the spectacles lens is a multi-focal surface without point or axis symmetry. The convex spherical front surface of the lens is held, during shaping of the rear surface, on a matching concave spherical surface with circular grooves (Si) connected to a vacuum source. The rear surface of the spectacles lens is so formed that it evolves from the addition of a spherical or toric effect component with a bifocal or trifocal component. An individual optimisation of the dioptric values, e.g. sphere, astigmatism, prism, in all points on the surface of the spectacles lens facing the eye is provided.