There is no one-click solution as there is with red-eye in humans. There is much good information in the following threads.
Experiment with moving the flash further from the camera lens next time.
https://discussions.apple.com/thread/3356226
https://discussions.apple.com/message/11378489#11378489
https://discussions.apple.com/message/12895900#12895900
https://discussions.apple.com/message/11378489#11378489
I found it in Apple support website. Check it :)