Important inventions related to medicine have been made in Colombia, such as the first external artificial pacemaker with internal electrodes, invented by the electronics engineer Jorge Reynolds Pombo, invention of great importance for those who suffer from heart failure. Also invented in Colombia were the microkeratome and keratomileusis technique, which form the fundamental basis of what now is known as LASIK (one of the most important techniques for the correction of refractive errors of vision) and the Hakim valve for the treatment of Hydrocephalus. Colombia has begun to innovate in military technology for its army and other armies of the world; especially in the design and creation of personal ballistic protection products, military hardware, military robots, bombs, simulators and radar.