Pacemakers and heart valves have made longer life possible. Toady, most heart problems can now be overcome with the implementation of some type of technology. However, no machine is perfect, as pacemakers and valves can break. But, then again do you really want to know what time it is. Our society has become one based on what time it is.
Airplanes arrive and depart at a certain time.
Classes at colleges begin and end at certain times. What if your watch breaks or the battery runs out. On the other hand, the technology of contact lenses and glasses is for the most part positive. These technologies have the potential for every human to have perfect vision. While it is true lenses get scratched and contacts tear.