DÜSSELDORF, Germany — Andreas Lubitz, who was flying the Germanwings jetliner that slammed into a mountain in the French Alps on Tuesday, sought treatment for vision problems that may have jeopardized his ability to continue working as a pilot, two officials with knowledge of the investigation said Saturday.

The revelation of the possible trouble with his eyes added a new element to the emerging portrait of the 27-year-old German pilot, who the authorities say was also being treated for psychological issues and had hidden aspects of his medical condition from his employer. The police found antidepressants during a search of his apartment here on Thursday, an official said Saturday.

It is not clear how severe his eye problems were or how they might have been related to his psychological condition. One person with knowledge of the investigation said the authorities had not ruled out the possibility that the vision problem could have been psychosomatic.