For the arcs, ideally you want one of those old digital bedside clocks, the ones with red LED numbers. A single red LED isn’t usually bright or big enough, but you might be lucky. Turn the lights out and don’t quite look at the numbers – go just a little bit to the side. Over a few seconds to perhaps half a minute you should start seeing blue or bluish-violet arcs from the light to where your blind spot(s) are (two arcs per eye, one arching over and one under, like the outline of a giant almond), and probably a bluish glow around the red numbers. Close one eye and that side’s will go away, of course. Eventually they will fade, but blinking will refresh them until then.