Computer-implemented method for a mobile terminal for determining at least one centration parameter, the at least one centration parameter enabling spectacle lenses to be arranged correctly in a spectacle frame, comprising: capturing a first image of an eye area of a person at a first position of the mobile terminal by means of a camera (11, 12) of the mobile terminal, capturing a second image of the eye area at a second position of the mobile terminal by means of the camera (11, 12), and determining the at least one centration parameter on the basis of the first image and the second image and on the basis of image angle properties of the camera (11, 12), the image angle properties specifying the pixels of an image sensor of the camera (11, 12) on which an object which is at a specific angle with respect to the optical axis of the camera is imaged, repeated measurement of an acceleration of the mobile terminal during a movement of the mobile terminal from the first position to the second position being effected, determining the at least one centration parameter additionally being effected on the basis of the repeated measurement of the acceleration, characterized in that the mobile terminal has an intrinsic calibration for at least substantially eliminating distortions of the camera (11, 12) computationally, and in that the method additionally comprises determining the image angle properties of the camera, in which case, for determining the image angle properties, the same objects which are at a distance of more than one metre from the image sensor are captured in a first determination image and a second determination image with two different angular positions of the mobile terminal respectively for a rotation about a first axis parallel to the surface of the image sensor and about a second axis perpendicular to the first axis and parallel to the surface of the image sensor, and the image angle properties are determined from image position displacements of the objects between the respective first and second determination images for the first axis and the second axis and a respective rotation of the mobile terminal between the two different angular positions. capturing a first image of an eye area of a person at a first position of the mobile terminal by means of a camera (11, 12) of the mobile terminal, capturing a second image of the eye area at a second position of the mobile terminal by means of the camera (11, 12), and determining the at least one centration parameter on the basis of the first image and the second image and on the basis of image angle properties of the camera (11, 12), the image angle properties specifying the pixels of an image sensor of the camera (11, 12) on which an object which is at a specific angle with respect to the optical axis of the camera is imaged, repeated measurement of an acceleration of the mobile terminal during a movement of the mobile terminal from the first position to the second position being effected, determining the at least one centration parameter additionally being effected on the basis of the repeated measurement of the acceleration, characterized in that the mobile terminal has an intrinsic calibration for at least substantially eliminating distortions of the camera (11, 12) computationally, and in that the method additionally comprises determining the image angle properties of the camera, in which case, for determining the image angle properties, the same objects which are at a distance of more than one metre from the image sensor are captured in a first determination image and a second determination image with two different angular positions of the mobile terminal respectively for a rotation about a first axis parallel to the surface of the image sensor and about a second axis perpendicular to the first axis and parallel to the surface of the image sensor, and the image angle properties are determined from image position displacements of the objects between the respective first and second determination images for the first axis and the second axis and a respective rotation of the mobile terminal between the two different angular positions.