Method for determining geometrical parameters of a soft contact lens, the method comprising the steps of - providing an OCT imaging device comprising an OCT light source; - providing a soft contact lens having a back surface and a front surface; - arranging the soft contact lens relative to the OCT imaging device such that light coming from the OCT light source impinges on the back surface of the soft contact lens; - irradiating the soft contact lens with light from the OCT light source and generating a three-dimensional OCT image of the soft contact lens using the OCT imaging device; - from the three-dimensional OCT image determining a plurality of edge points (E i) located on the edge of the soft contact lens; - connecting adjacent ones (E 1,E 2; E 2,E 3) of the edge points in a circumferential direction by individual straight lines, each of the individual straight lines having a length (U i), to form an approximated circumference of the soft contact lens; - summing up the lengths (U i) of all individual straight lines, the sum of the lengths of all individual straight lines representing a length U of the approximated circumference of the soft contact lens; - from the so determined length U of the approximated circumference of the soft contact lens determining a diameter D of the soft contact lens according to the equation D = U / π; the method being characterized by the step of - determining a center of the back surface of the soft contact lens by extracting the back surface of the soft contact lens from the three-dimensional OCT image, and by determining that point on the back surface to be the center of the back surface from which a sum of all shortest distances from that point along the back surface to all edge points (E i) is minimal. - providing an OCT imaging device comprising an OCT light source; - providing a soft contact lens having a back surface and a front surface; - arranging the soft contact lens relative to the OCT imaging device such that light coming from the OCT light source impinges on the back surface of the soft contact lens; - irradiating the soft contact lens with light from the OCT light source and generating a three-dimensional OCT image of the soft contact lens using the OCT imaging device; - from the three-dimensional OCT image determining a plurality of edge points (E i) located on the edge of the soft contact lens; - connecting adjacent ones (E 1,E 2; E 2,E 3) of the edge points in a circumferential direction by individual straight lines, each of the individual straight lines having a length (U i), to form an approximated circumference of the soft contact lens; - summing up the lengths (U i) of all individual straight lines, the sum of the lengths of all individual straight lines representing a length U of the approximated circumference of the soft contact lens; - from the so determined length U of the approximated circumference of the soft contact lens determining a diameter D of the soft contact lens according to the equation D = U / π; - determining a center of the back surface of the soft contact lens by extracting the back surface of the soft contact lens from the three-dimensional OCT image, and by determining that point on the back surface to be the center of the back surface from which a sum of all shortest distances from that point along the back surface to all edge points (E i) is minimal.