Felipe Massa's Formula One career appears to be hanging in the balance following confirmation he has suffered some damage to his left eye.

Massa is in intensive care at the AEK military hospital in Budapest after suffering a skull fracture following a freak accident on Saturday during qualifying for the Hungarian Grand Prix.

"He has suffered some damage to the eye," Professor Robert Veres said. "We don't know if he'll be able to race again."

Earlier it was claimed that Massa had "a quiet night" as he continued his recovery.

After Sunday's race at the Hungaroring, Massa was visited by Ferrari team principal Stefano Domenicali, team-mate Kimi Raikkonen and Brawn GP's Rubens Barrichello and boss Ross Brawn.

It was a spring that had worked loose on Barrichello's car that hit Massa on his helmet at 162mph, causing his injuries and subsequent crash into a tyre barrier.

A Ferrari spokesman said: "Felipe had a quiet night. He is okay, and he is due to have another CT scan on Monday."

Doctors at the hospital were encouraged by the positive results of Sunday's first CT scan following surgery, with the hope Massa continues to show steady improvement.

A spokesman for the Hungarian defence ministry, under whose jurisdiction the hospital is run, has been quoted as saying on local television that Massa is starting to "communicate actively".

"He reacts when he's spoken to. We are optimistic a slow recovery is beginning," said Istvan Bocskai, who also confirmed Massa could move his hands and legs.