A New York ophthalmologist told FoxNews.com that special glasses former Secretary of State Hillary Clinton was seen wearing last year are used to treat double vision, which is sometimes caused by severe head trauma.
Dr. Marc Werner explained the purpose of the Fresnel prism eyeglasses, like the ones Clinton wore, amid questions about the potential presidential candidate's health. The subject was raised after Karl Rove commented on her time in and out of the hospital in December 2012.
"In order to see one object, your eyes need to be pointed in the same direction. If your eyes are misaligned, one way to optically align them is to put a prism ... on your glasses," Werner said.Read the rest of the video HERE and view a related video below:
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