A displacement prevention coating agent is provided which can prevent a displacement in lens processing, which is soluble in water and which exhibits a transparent appearance at least after being cured. The displacement prevention coating agent may coat the front and rear surfaces of a lens so that when cutting processing is performed on an end surface of the lens, a holding position of the front and rear surfaces of the lens held by a chuck device is prevented from being displaced. A water-repellent coat layer may be formed as a membrane such that the end surface has a shape corresponding to a frame. The displacement prevention coating agent may be formed of an aqueous solution whose main components are a hydrophilic resin, a surfactant having a perfluoro group and an emulsion.

A lens edging system includes: an edger configured to perform edging to a spectacle lens in accordance with three-dimensional edging locus data obtained from edging shape data by calculation; a three-dimensional circumferential length measurement device configured to measure a circumferential length of the spectacle lens edged by the edger; and an edging size management device configured to correct a calculation parameter used for calculating the edging locus data, based on a difference between a measured circumferential length obtained by a three-dimensional circumferential length measurement device, and a theoretical circumferential length obtained by calculation.

Disclosed is a method for assisting a user in taping an adhesive label to a surface of an ophthalmic lens with an initial contour prior to edge grinding, the method including:holding of the ophthalmic lens with its initial contour by a holder,determining, from geometric data for the final contour of the ophthalmic lens to be produced, of a position of the final contour inside the initial contour of the ophthalmic lens,creating a visual aid for the user enabling the latter to apply the adhesive label to the ophthalmic lens with its initial contour prior to edge grinding, such that the adhesive label can be applied inside the final contour.

Disclosed is a method for assisting a user in taping an adhesive label to a surface of an ophthalmic lens with an initial contour prior to edge grinding, the method including:holding of the ophthalmic lens with its initial contour by a holder,determining, from geometric data for the final contour of the ophthalmic lens to be produced, of a position of the final contour inside the initial contour of the ophthalmic lens,creating a visual aid for the user enabling the latter to apply the adhesive label to the ophthalmic lens with its initial contour prior to edge grinding, such that the adhesive label can be applied inside the final contour.

A method for machining optical workpieces has the following steps: i) providing the blank that is to be machined at least on the rear side and edge; ii) receiving the blank without a block in order to retain it in a supported manner; iii) machining the blank on the front side by use of a first tool to form a peripheral geometric shape with a depth greater than or equal to the edge thickness of the semifinished product to be formed; iv) receiving the workpiece to retain it in a supported manner on the front side; and v) machining the workpiece on the rear side by use of a second tool to form the semifinished product with the predetermined surface geometry on the rear side.

This disclosure includes methods and systems for producing ophthalmic lenses. Some methods include identifying a plurality of zones within a spatial representation of a lens blank, selecting, for each of the zones, one or more parameters for producing the lens, and producing the lens by removing material from the lens blank according to the one or more parameters of each of the zones.

A method for machining an optical lens via a trimming machine, includes: a step of locking the optical lens, a step of acquiring shape characteristics of the optical faces of the optical lens, a step of generating an instruction for trimming the optical lens, and a step of trimming the optical lens along a desired contour. The method also includes the following steps: a step of generating an instruction for etching the optical lens depending on the acquired shape characteristics, and a step of etching the optical lens along a line located inside the desired contour, during which a pointed etching tool of the trimming machine is controlled according to the etching instruction in such a way that the point of same continually slides against the optical face in order to score same along the line.

A method for machining an optical lens via a trimming machine, includes: a step of locking the optical lens, a step of acquiring shape characteristics of the optical faces of the optical lens, a step of generating an instruction for trimming the optical lens, and a step of trimming the optical lens along a desired contour. The method also includes the following steps: a step of generating an instruction for etching the optical lens depending on the acquired shape characteristics, and a step of etching the optical lens along a line located inside the desired contour, during which a pointed etching tool of the trimming machine is controlled according to the etching instruction in such a way that the point of same continually slides against the optical face in order to score same along the line.

In an eyeglass lens processing apparatus, if a material selector selects a thermoplastic material for the lens, a control unit performs a first step and then a second step. In the first step, the control unit controls a lens rotating unit to position a lens in a plurality of lens rotation angles and controls an axis-to-axis distance changing unit to cause a roughing tool to cut into the lens up to a roughing path for each of the plurality of lens rotation angles, the lens being not rotated by the lens rotating unit when the roughing tool is cutting into the lens up to the roughing path. In the second step, the control unit controls the lens rotating unit and the axis-to-axis distance changing unit to rough the lens based on the roughing path while the lens rotating unit rotates the lens.

In an eyeglass lens processing apparatus, if a material selector selects a thermoplastic material for the lens, a control unit performs a first step and then a second step. In the first step, the control unit controls a lens rotating unit to position a lens in a plurality of lens rotation angles and controls an axis-to-axis distance changing unit to cause a roughing tool to cut into the lens up to a roughing path for each of the plurality of lens rotation angles, the lens being not rotated by the lens rotating unit when the roughing tool is cutting into the lens up to the roughing path. In the second step, the control unit controls the lens rotating unit and the axis-to-axis distance changing unit to rough the lens based on the roughing path while the lens rotating unit rotates the lens.