A system is provided that responds to a received transaction. The inventive washbasin is characterized in that it essentially comprises at least one part which forms a water receptacle and which is made from glass or glass-ceramic and at least one part which prevents the water from flowing from the first part. If desired, the values may be filtered in an effort to increase the accuracy of the range estimation. The processor may compare the images with control images, past images of the same eye or other diagnostic modalities such as fundus photography, angiography, or visual field testing to detect the retinal disease or damage. The Zener diode absorbs a surge voltage applied to the capacitor, the U-phase arm, the V-phase arm, and the W-phase arm.