Abstract: Disclosed is a method of preparing an operation of surfacing of a lens blank to transform the lens blank into a generated lens having a predetermined prism corresponding to an inclination between a front surface and a back surface of the generated lens at least locally. The method includes: for a plurality of devices destined to interact with the lens blank during the operation of surfacing to manufacture the predetermined prism of the generated lens, attributing a priority order to each; based on the priority order, attributing to each device a prism portion which is zero or included in a respective range delimited by a respective minimum prism portion and a respective maximum prism portion, the prism portion representing contribution of the corresponding device to the prism of the generated lens, for further interaction of each device with the lens blank during the operation of surfacing.

Abstract: Method implemented by computer means for determining an ophthalmic lens adapted to a wearer and to a spectacle frame, the method comprising: providing wearer data comprising the wearer's ophthalmic prescription, providing mounting data comprising at least the tie points of the ophthalmic lens to be mounted in the spectacle frame, providing thickness requirement data comprising the minimum thickness of the ophthalmic lens at the tie points, determining ophthalmic lens data based on the wearer data, the ophthalmic lens data comprising the two optical surfaces of the ophthalmic lens and their relative positions, an oversize creating step (S5), during which the ophthalmic lens determined during the ophthalmic lens data determining step is locally thickened by creating an oversize at the tie points, so that the thickness of the ophthalmic lens at the tie points is greater than or equal to the minimum thickness.

Abstract: A method for manufacturing an optical lens, includes the steps of providing a blank (1) which includes an upper surface and a lower surface (33) for forming first and second lens surfaces (2), an edge surface (4) forming a first mechanical positioning reference point and a ramp portion (5) provided between the edge surface and the upper surface, which forms a second positioning reference point; providing a positioning ring (10) including a cavity defining an inner contour (20) concentric with the edge surface which forms a first complementary control reference point and a shoulder (21) forming a second complementary control reference point; fitting the blank into the cavity, the edge surface being in contact with the inner contour and the ramp portion being in contact with the shoulder; and locking the blank in position on a locking and supporting pin, the ring then being positioned there between.

Abstract: The disclosed embodiments include a method for determining a geometric definition of a piece of personalized optical equipment adapted to its wearer, comprising at least one geometric definition of a personalized frame of this piece of personalized equipment. In one embodiment, the geometric definition of said personalized frame is determined depending on at least one geometric parameter of personalization of the frame and on a reference frame chosen by the wearer. Further, the value of said at least one geometric parameter of personalization of the frame being determined on the basis of the acquisition of data relating to at least one morphological quantity of the head of the wearer, in such a way that the personalized frame is adjusted to conform with a least one criterion of adjustment of personalization of the geometry of the frame with respect to the morphological quantity of the head of the wearer.

Abstract: A method for designing a mould (120) for casting a semi-finished ophthalmic lens blank, wherein the surface of the mould (120) is designed so that the surface of the mould fits a predetermined closed curve, wherein the predetermined closed curve is representative of the geometry of a gasket (160) to be used in association with the mould (10). A method for assembling a mould assembly (100) and a method for casting a semi-finished ophthalmic lens blank, and a computer program product including software code portions for performing steps of these methods are also described.

Abstract: Disclosed is a method for determining location of a lens machining tool (24) having an offset location according to a first direction (Y) smaller than a first predetermined threshold, including the steps of manufacturing a calibration piece (10) according to a predetermined theoretical geometry by using the lens machining tool for providing a at least partially annular groove in a main surface of the calibration piece, the at least partially annular groove being configured to form at least one sharp edge defining a slope discontinuity on the main surface; measuring a distance between the at least one sharp edge and a turning center of the calibration piece for providing data of geometrical characteristics of the calibration piece; and deducing from the measured data a location of the lens machining tool according to a second direction (X) distinct from the first direction.

Abstract: Disclosed is a method for deducing geometrical defects of an optical article turning machine, including a defect value deducing step, during which at least one geometrical defect value is deduced based at least on an indicative information of an optical and/or geometrical data related to an optical and/or geometrical characteristic of a checking piece (10).

Abstract: Disclosed is a method implemented by computer for determining a lens blank intended to be used for the manufacturing of a finished optical article. The method includes: —a virtual volume data determining step, during which virtual volume data are determined based at least on finished optical article data representative of the volume of the finished optical article and over-thickness data representative of over-thickness requirements, the virtual volume data are determined so that the virtual volume defined by the virtual volume data includes the volume of the finished optical article volume of the finished optical article and the over-thickness, —a lens blank determining step, during which a lens blank is determined based on the virtual volume data so as to include the virtual volume defined by the virtual volume data.

Abstract: The present invention relates to a method for transforming an initial progressive ophthalmic surface which has to be manufactured by a manufacturing method, the transformation method comprising: a step of selecting a manufacturing method intended to be implemented, in which said manufacturing method introduces a reproducible surface defect, a step of selecting a predictive model of said reproducible surface defect, a step of selecting an initial progressive ophthalmic surface S intended to be manufactured, a step of determining (S1), during which there is determined, by means of said predictive model, a surface defect value D which would be introduced if the initial progressive ophthalmic surface S were produced by said manufacturing method, a transformation step (S2), during which said initial progressive ophthalmic surface S is transformed into a transformed progressive ophthalmic surface S* by compensating the defect value D determined during the step (S1), such that the subsequent manufacture of the tr

Abstract: Methods for determining a progressive ophthalmic lens are described, the lens comprising a near and a far vision area, a main meridian separating the lens into a nasal and a temporal area. The method includes determining a first and a second surface of the lens, determining the second surface to provide, in combination with the first surface, vision correcting properties, and determining a spherical area on the first surface of the lens having a constant sphere value and including a far vision diopter measurement position. The far vision diopter measurement position and a near vision diopter measurement position have substantially the same mean sphere value. The method also includes determining the first surface to reduce the lens distortion by defining a toric area extending outside the spherical area on the first surface in at least one of the nasal and the temporal area, in which characteristics of the toric area are related to the lens astigmatism.

Abstract: The disclosed embodiments include a method for determining a geometric definition of a piece of personalized optical equipment adapted to its wearer, comprising at least one geometric definition of a personalized frame of this piece of personalized equipment. In one embodiment, the geometric definition of said personalized frame is determined depending on at least one geometric parameter of personalization of the frame and on a reference frame chosen by the wearer. Further, the value of said at least one geometric parameter of personalization of the frame being determined on the basis of the acquisition of data relating to at least one morphological quantity of the head of the wearer, in such a way that the personalized frame is adjusted to conform with a least one criterion of adjustment of personalization of the geometry of the frame with respect to the morphological quantity of the head of the wearer.

Abstract: Disclosed is a progressive ophthalmic lens including a front surface and a rear surface, each surface having in each point an altitude, a mean sphere value and a cylinder value, the front surface of the lens including: —a far vision zone having a far vision reference point; —a near vision zone having a near vision reference point; —a main meridian, wherein the front surface is regressive and has: —a sphere gradient normalized value of less than 7.50·10?1 mm?1 at any point in a central portion of the lens including a portion of the main meridian (32), the far vision reference point (FV) and the near vision reference point (NV); —a cylinder gradient normalized value of less than 1.45 mm?1 at any point in the central portion of the lens.

Abstract: A method for manufacturing an ophthalmic lens by machining, includes the steps of providing and mounting a blank on a first supporting device having a first machining reference frame in a first position in which a lower surface of the blank is opposite the first device; machining, in the first position in the first reference frame, an upper surface of the blank, machining in a second predetermined machining reference frame which is known relative to the first at least one mechanical referencing element on the blank, and providing a second supporting device including at least one complementary mechanical referencing element configured such as to engage with the at least one mechanical referencing element so that the latter is positioned and supported on the second device in a second predetermined position.

Abstract: Disclosed is a progressive ophthalmic lens including a front surface and a rear surface, each surface having in each point an altitude, a mean sphere value and a cylinder value, the front surface of the lens including: —a far vision zone having a far vision reference point; —a near vision zone having a near vision reference point; —a main meridian, wherein the front surface is regressive and has: —a sphere gradient normalized value of less than 7.50·10?1 mm?1 at any point in a central portion of the lens including a portion of the main meridian (32), the far vision reference point (FV) and the near vision reference point (NV); —a cylinder gradient normalized value of less than 1.45 mm?1 at any point in the central portion of the lens.

Abstract: Method implemented by computer means for determining an ophthalmic lens adapted to a wearer and to a spectacle frame, the method comprising: providing wearer data comprising the wearer's ophthalmic prescription, providing mounting data comprising at least the tie points of the ophthalmic lens to be mounted in the spectacle frame, providing thickness requirement data comprising the minimum thickness of the ophthalmic lens at the tie points, determining ophthalmic lens data based on the wearer data, the ophthalmic lens data comprising the two optical surfaces of the ophthalmic lens and their relative positions, an oversize creating step (S5), during which the ophthalmic lens determined during the ophthalmic lens data determining step is locally thickened by creating an oversize at the tie points, so that the thickness of the ophthalmic lens at the tie points is greater than or equal to the minimum thickness.

Abstract: A method for manufacturing an optical lens, includes the steps of providing a blank (1) which includes an upper surface and a lower surface (33) for forming first and second lens surfaces (2), an edge surface (4) forming a first mechanical positioning reference point and a ramp portion (5) provided between the edge surface and the upper surface, which forms a second positioning reference point; providing a positioning ring (10) including a cavity defining an inner contour (20) concentric with the edge surface which forms a first complementary control reference point and a shoulder (21) forming a second complementary control reference point; fitting the blank into the cavity, the edge surface being in contact with the inner contour and the ramp portion being in contact with the shoulder; and locking the blank in position on a locking and supporting pin, the ring then being positioned there between.

Abstract: A method for manufacturing an ophthalmic lens by machining, includes the steps of providing and mounting a blank on a first supporting device having a first machining reference frame in a first position in which a lower surface of the blank is opposite the first device; machining, in the first position in the first reference frame, an upper surface of the blank, machining in a second predetermined machining reference frame which is known relative to the first at least one mechanical referencing element on the blank, and providing a second supporting device including at least one complementary mechanical referencing element configured such as to engage with the at least one mechanical referencing element so that the latter is positioned and supported on the second device in a second predetermined position.

Abstract: A method for determining a progressive ophthalmic lens comprising a near and a far vision area, a main meridian separating the lens into a nasal and a temporal area, the method comprising: determining a first and a second surface of the lens; determining the second surface to provide, in combination with the first surface, the vision correcting properties; determining a spherical area on the first surface of the lens having a constant sphere value and including a far vision diopter measurement position, wherein the far and a near vision diopter measurement position have substantially the same mean sphere value; and determining the first surface to reduce the lens distortion by defining a toric area extending outside the spherical area on the first surface in at least one of the nasal and the temporal area, wherein characteristics of the toric area are related to the lens astigmatism.

Abstract: The present invention relates to a method for transforming an initial progressive ophthalmic surface which has to be manufactured by a manufacturing method, the transformation method comprising: a step of selecting a manufacturing method intended to be implemented, in which said manufacturing method introduces a reproducible surface defect, a step of selecting a predictive model of said reproducible surface defect, a step of selecting an initial progressive ophthalmic surface S intended to be manufactured, a step of determining (S1), during which there is determined, by means of said predictive model, a surface defect value D which would be introduced if the initial progressive ophthalmic surface S were produced by said manufacturing method, a transformation step (S2), during which said initial progressive ophthalmic surface S is transformed into a transformed progressive ophthalmic surface S* by compensating the defect value D determined during the step (S1), such that the subsequent manufacture of the tr

Abstract: A process for designing an ophthalmic progressive eyeglass comprises providing an initial front surface and an initial back surface. Respective addition values of front and back surfaces of the eyeglass are varied based on said initial front and back surfaces using a surface derivation tool. These surface addition values are selected so that the eyeglass exhibits an eyeglass addition value which matches a wearer's prescription and a value for a design feature which matches a target value. Said target value may be used for customizing the ophthalmic progressive eyeglass. The process does not require point-to-point surface optimization.