The Hill had a concussion and apparently that concussion has/had caused double vision. This link is not from the RNC nor Rove. It is from Visionhelp.
http://visionhelp.wordpress.com/2013/01/26/hillary-clintons-double-vision/
It is a statement regarding awareness of one of the more common sequelae of Acquired Brain Injury: double vision. Here is a very famous individual, on a very public stage, thrust deeper into the public eye because of her binocular vision problems after closed head injury.
Please go to the link for the clinical diagnosis and pictures.
http://visionhelp.wordpress.com/2013/01/26/hillary-clintons-double-vision/
For the scientific reality of her left lens go to the link and read.
The liberal media is agog about head injuries that athletes have, and yet, they have not really discussed how Hill injured her head and the severity of her injury.