Complete Headline: Does Hillary have double vision after blood clot scare? Close up shot shows 'Fresnel prism' lenses in Clinton’s glasses Hillary Clinton's glasses appeared to have a Fresnel prism on the lens when she appeared before the Senate this week The stick-on prisms are used to assist people experiencing double vision Doctors discovered a blood clot close to Clinton's brain after she suffered a fall and concussion last month Secretary of State Hillary Clinton has wasted no time in getting back to business since returning to work following treatment for a blood clot. But tiny lines visible on the...