Diaphragm (optics) curved blades improve the roundness of the iris opening. In a photograph, the number of blades that the iris diaphragm has can be guessed by counting the number of diffraction spikes converging from a light source or bright reflection. For an odd number of blades, there are twice as many spikes as there are blades. In case of an even number of blades, the two spikes per blade will overlap each other, so the number of spikes visible will be the number of blades in the diaphragm used. This is most apparent in pictures taken in the dark with small
Diaphragm pacing be performed in a minimally-invasive manner. In the case of the NeuRx device, a series of four incisions are made in the abdominal skin. Several tools such as a laparoscope and probe are used to find the best four locations on the diaphragm to attach four electrodes, which have connections outside the body. A fifth electrode is placed just under the skin in the same area. All these connect to the device. Diaphragm pacing Diaphragm pacing, (and even earlier as electrophrenic respiration), is the rhythmic application of electrical impulses to the diaphragm to provide ventilatory support for respiratory failure or