Theory:Doctor Who television discontinuity and plot holes/Oxygen


 * Why isn't the Doctor using his regeneration powers to repair his eyes?
 * Because it isn't life threatening and would be a waste of a full rejig.
 * There's never been any indication that a Time Lord can direct regeneration energy to repair a single part of their own body. We have only ever seen the Doctor do this to other people (i.e. River Song's wrist, reviving Davros), never to himself.
 * Well, he did restore his hand after it was sliced off at Christmas during the Sycorax invasion, but that stil required him to have triggered a complete regeneration beforehand. Point stands: he'd have to trigger a regeneration to heal the condition but such is a waste since he's isn't going to die from being blind.