A Secure Digital card, and an system and an operating method for the SD card are disclosed. The above agent is useful for prevention and therapy of various glomerular diseases including chronic glomerular nephritis. The surface defect regions may also be created by ion implantation, preferably using boron. Both the first and second electrical potentials are transmitted to the jaw members through the first shaft. When a change in a distance between the lamp body and the operating site is detected, the first and second light intensities of the first and second light sources, respectively, can be controlled such that the predetermined diameter at which the preset relative central illuminance of the resultant light field is generated is maintained at a substantially constant value as the distance changes.