Disclosed is an axial force transducer comprising a deformable element which forms a measuring spring and is rotationally symmetrical to the force inducing axis as well as strain gauges that are arranged in pairs in areas extending in opposite directions and are connected so as to form an electrical resistance bridge. Between a first sealing element and a second sealing element there is disposed a supporting ring, which, on each of its side faces assigned to the sealing elements, has a contour for the reception and diversion of a fluid volume which has flowed onto the supporting ring as a result of leakage in the region of the respectively assigned sealing element. The radially segmented apodized diffractive multifocal IOL may pass optical energy in both photopic and mesopic conditions. The first contact part is held by the insulator to be independently removable.