As mentioned before, Wooting optical switches do not work by sending electrical currents on key contact. It works with small infra-red LED lights on the PCB board and receivers of thereof. At the moment keys are not pressed, the path of the infra-red light is interrupted, and the receiver is not getting any light. Once a key is pressed the light has a clear path to the receiver again which registers the key stroke.
Because optical switches do not contain any metal contact plates needed for the key activation, they are in theory cheaper to produce and more resistant to wearing out than regular mechanical switches. For comparison, it is claimed that the Flaretech switches have a lifetime of 100 million key strokes, while the Cherry MX are claimed to last 50 million keystrokes.
Another benefit of the optical switches is that the contact with the print plate is easier. It is not necessary to solder any parts, which makes the switches easier to change. You even get a small tool kit with your keyboard for picking up and removing the switches out of the keyboard. This way you can swap between the linear and clicky. This means that you are no longer bound to one switch type when choosing a new keyboard. You also get a few spare switches in case one dies.