Method and device for measuring the local refractive power and/or refractive power distribution of a spectacle lens

A method for measuring a local refractive power of a left and/or a right spectacle lens in a spectacle frame, the method comprising:

• capturing at least two first image representation of a scene with at least one structure point and with the left and/or the right spectacle lens in the spectacle frame with at least one image capture device from at least two recording positions respectively having at least one imaging beam path for the at least one structure point, the respective imaging beam paths passing through the left or the right spectacle lens;
• capturing at least two further image representations of the scene with the at least one structure point imaged in the at least two first image representations with the at least one image capture device from at least two different recording positions without the spectacle frame containing the left and/or the right spectacle lens,
• wherein in the at least two first image representations of the scene a section of the spectacle frame of the pair of spectacles is captured, the section defining a coordinate system of the spectacle frame of the pair of spectacles;
• calculating coordinates of the at least one structure point in a coordinate system, which is referenced to the coordinate system of the spectacle frame, from the at least two further image representations of the scene with image evaluation;
• calculating an absolute position, a relative position, and a boundary of the spectacle frame with the image evaluation;
• and
• determining the local refractive power for at least one section of the left spectacle lens and/or for at least one section of the right spectacle lens with a ray model with imaging beam paths passing through the left and/or right spectacle lens, which reach the at least one structure point after refraction by the left and/or right spectacle lens, from the coordinates of the at least one structure point and a chief ray, which passes through the left or right spectacle lens and which is calculated for the image of the at least one structure point in at least one of the first image representations of the scene corresponding to the respective position of the at least one image capture device.

A method for measuring a local refractive power of a left and/or a right spectacle lens in a spectacle frame, the method comprising:

• capturing at least one first image representation of a scene having a plurality of structure points and the left and/or the right spectacle lens in the spectacle frame with at least one image capture device from at least one first recording position having at least one imaging beam path for each of the plurality of structure points, the imaging beam path passing through the left and/or the right spectacle lens,
• capturing at least two further image representations of the scene without the left and/or the right spectacle lens of the spectacle frame or without the spectacle frame containing the left and/or the right spectacle lens but with the plurality of structure points imaged in the first image representation with the at least one image capture device from at least two different recording positions, one of which can be identical to the first recording position;
• calculating coordinates of the plurality of structure points in a coordinate system from the at least two further image representations of the scene by image evaluation;
• and
• determining the local refractive power for at least one section of the left spectacle lens and/or for at least one section of the right spectacle lens from the coordinates of the plurality of structure points and the image of the structure points in the at least one first image representation of the scene with an inverted approach, in which an optical interfaces and/or the refractive index of the left and/or right spectacle lens are calculated from the imaging beam paths for the structure points.

A method for measuring a local refractive power of a left and/or a right spectacle lens in a spectacle frame, the method comprising:

• capturing at least one first image representation of a scene having a plurality of structure points and the left and/or the right spectacle lens in the spectacle frame with at least one image capture device from at least one first recording position having at least one imaging beam path for each of the plurality of structure points, the imaging beam path passing through the left and/or the right spectacle lens,
• capturing at least two further image representations of the scene with the left and/or the right spectacle lens with the at least one image capture device from at least two different further recording positions, which differ from the first recording position and which each have at least one imaging beam path for the structure points captured in the first image representation, the imaging beam paths not passing through the left and the right spectacle lens of the spectacle frame;
• calculating coordinates of the plurality of structure points in a coordinate system from the at least two further image representations of the scene by image evaluation;
• and
• determining the local refractive power for at least one section of the left spectacle lens and/or for at least one section of the right spectacle lens from the coordinates of the plurality of structure points and the image of the structure points in the at least one first image representation of the scene with an inverted approach, in which an optical interfaces and/or the refractive index of the left and/or right spectacle lens are calculated from the imaging beam paths for the structure points.