It was a week before Christmas last year when Serhiy Sydorenko underwent corneal surgery on his right eye, a complicated operation that, if successful, would put an end to more than three decades of blindness for the 56-year-old Ukrainian.
When the nurses first removed the bandages some hours after the operation, all he could see was light. Painfully bright light, as though someone was directing a beam right at his face. The nurses applied eyedrops and re-tied the bandages.
