Abstract:
The invention concerns a method for producing multifocal correction lenses from semi-finished lenses (1) having at least a first positioning marker M, associated with a correction A called distant vision correction, and a second positioning marker M' associated with a correction B called near vision correction. The method comprises a step which consists in a surface grinding of the semi-finished lens (1) on an internal surface of said lens. The latter is inclined at a specific angle ( beta ), for example using a wedge, so as to induce a prism of prismatic deviation such that the distant vision and the near vision optical centres are brought together and merge. The invention also concerns a system controlled by a data processing device, for example a micro-computer (8), for automatically carrying out the surface grinding step using a recorded programme and parameters input (80) by an operator.
Abstract:
Method for determining movement data representing the movement of a machining tool of an optical lens 3D machining device for machining a surface of an optical lens, wherein the method comprises: ▪ a machining tool data providing stage, ▪ a surface data providing stage, ▪ a machining rule providing stage, ▪ a 3D surface determining stage in which the 3D surface corresponding to the surface consisting of all the positions of the reference point of the machining tool that allow the profile of the cutting edge of the machining tool to tangent the derivable surface of the optical lens is determined, ▪ a movement data determining stage.
Abstract:
A method of forming a photochromic segmented multifocal lens is described. The method involves, forming a segmented multifocal lens blank by molding, in which the segmented multifocal lens blank has a front surface and a rear surface. The front surface of the segmented multifocal lens blank includes a segmented optical power addition portion. The method further includes, grinding the rear surface of the segmented multifocal lens blank, thereby forming a segmented multifocal finished lens having a front surface and a rear surface. The front surface of the segmented multifocal finished lens includes the segmented optical power addition portion. The method additionally includes, forming a photochromic coating layer over at least a portion of the rear surface of the segmented multifocal finished lens. The photochromic coating layer includes at least one photochromic compound.
Abstract:
A method of determining the blocking position of an optical lens Method for determining a position of an optical lens member placed on a lens blocking ring (22), the method comprising: - a reference system providing step (S1), - a blocking ring data providing step (S2), - an optical lens member surface data providing step (S3), - a position parameters providing step (S4) during which position parameters defining a position of a reference point of the surface of the lens member with respect to the main plane of the reference system and an orientation, about the main axis of said placed surface at said reference point, - an initial position determining step (S5) during which the position of the placed surface is determined according to the position parameters, - a repositioning step (S6) during which the placed surface is virtually translated and rotated, - an altitude determination step (S7) during which a difference in position between the blocking ring and the placed surface is determined, the repositioning and altitude determining steps (S6, S7) are repeated so as to minimizing the difference in position between the blocking ring and the placed surface.
Abstract:
The invention concerns a process for measuring and/or controlling a polishing process of an ophthalmic element (1) comprising the steps of -manufacturing at least two cavities (2, 3) on the surface of the element to be polished, the depth of the first cavity (2) being smaller than the depth of the second cavity (3) -operating the polishing process -considering the element (1), in order to check that the first cavity (2) is suppressed and that the second cavity (3) is present.
Abstract:
The invention concerns a process for measuring and/or controlling a polishing process of an ophthalmic element (1) comprising the steps of -manufacturing at least two cavities (2, 3) on the surface of the element to be polished, the depth of the first cavity (2) being smaller than the depth of the second cavity (3) -operating the polishing process -considering the element (1), in order to check that the first cavity (2) is suppressed and that the second cavity (3) is present.
Abstract:
Method for machining a face (1) of an optical object (6), comprising a step of providing a machine tool which itself comprises: a bed (1) for locating an object to be machined, this bed (1), which has a receiving surface (3), being angularly adjustable about an axis perpendicular to the receiving surface (3); a spindle (8) suitable for rotating a machining tool (9) about an axis essentially parallel to the receiving surface (3) of the bed (1) and suitable for moving this machining tool (9) translationally in a plane essentially parallel or perpendicular to the receiving surface (3) of the bed (1).
Abstract:
Method for machining a face (1) of an optical object (6), comprising a step of providing a machine tool which itself comprises: a bed (1) for locating an object to be machined, this bed (1), which has a receiving surface (3), being angularly adjustable about an axis perpendicular to the receiving surface (3); a spindle (8) suitable for rotating a machining tool (9) about an axis essentially parallel to the receiving surface (3) of the bed (1) and suitable for moving this machining tool (9) translationally in a plane essentially parallel or perpendicular to the receiving surface (3) of the bed (1).
Abstract:
The present invention relates to a method of coating a lens, such as a segmented multifocal lens. The method includes, providing a lens support (1), which is in the form of a ring, that includes a central axis (11), an outer wall (14), an inner wall (17) that is positioned between the central axis and the outer wall, an upper beveled surface (20) that converges downward toward the central axis, and a lower surface (29). The method further includes positioning a lens (3) such that an outer edge (74) of a forward surface (65) thereof abuts a portion of the upper beveled surface of the lens support. At least one coating composition is applied over the rear surface (68) of the lens, so as to form a coated lens (3') having at least one coating layer (89) over the rear surface thereof.