A system and method for controlling the inflation, ablation, and deflation of a balloon catheter. A device for measuring the centricity of a conductor in an insulating casing includes an inductive measuring apparatus, first and second optical measuring apparatus and an evaluation apparatus. To this end, a method for displaying a perspective image with one image element for at least one passenger of a motor vehicle is provided, said image representing the view of the passenger. The X-direction moving member is supported by the Y-direction moving member so as to slide in the X-direction. The diodes may be LEDs or photovoltaic diodes, and in some embodiments, have a junction formed at least partially as a hemispherical shell or cap.