The 28-year-old Brazilian is now out of coma and expected to walk out of hospital sometime next week with no long-term effects from his serious head injuries.
But the damage done to his left eye remains largely unknown, amid reports the optic nerve was damaged when his helmet and visor was struck by a 800 gram steel damper spring at 275kmh last Saturday afternoon.
An official of the AEK hospital on Tuesday is quoted by Italy's ANSA news agency as saying checks on the injured eye will only be able to be conducted "in a week to ten days, not before".
But Massa's personal doctor, also attending to Massa at the AEK military hospital in central Budapest, insists: "His left eye has no problem, his eyesight is okay."
Massa's father Luiz Antonio said: "Felipe is better and better, I would not say from day to day but rather from hour to hour."