The co-pilot who apparently crashed a Germanwings jet intentionally into the Alps had vision problems and feared going blind, a French prosecutor says.
Marseille Prosecutor Brice Robin told reporters that Andreas Lubitz feared his vision problems would put his job at risk.
Mr Robin said Lubitz saw 41 doctors in the five years before the March 24 crash. All 150 people on board were killed.
Authorities say Lubitz locked the pilot out of the cockpit and apparently crashed the jet intentionally.
Mr Robin added that some doctors who treated Lubitz felt he was unfit to fly, but did not tell his employers because of German patient secrecy laws.
He said the co-pilot had seen seven doctors within the month before the crash, including three appointments with a psychiatrist.
Mr Robin says that some of the doctors felt Lubitz was psychologically unstable, and some felt he was unfit to fly, but "unfortunately that information was not reported because of medical secrecy requirements".
In Germany, doctors risk prison if they disclose information about their patients to anyone unless there is evidence they intend to commit a serious crime or harm themselves.