Stress has also been linked in previous research with premature births and birth defects including visual, hearing and intellectual impairments, as well as complications in the respiratory, gastrointestinal and renal systems.

BBC: Earthquakes 'trigger early births'

Scientists have said that designing a bionic eye has been much more difficult than developing aids like cochlear implants for hearing, in part because visual information is two-dimensional, and because of the anatomy of the eye.

WSJ: FDA Approves Bionic Eye