Unfit for office. http://www.dailymail.co.uk/news/art...ary-State-double-vision-blood-clot-scare.html 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 65-year-old's glasses when she appeared before the Senate this week indicate she may still be experiencing the after-effects of her spell of ill health. It is thought Clinton was wearing a Fresnel prism on her spectacles - a stick-on panel often used to treat double vision. The faint vertical lines are visible on the left lens of Clinton's glasses in photographs taken during her testimony about the terrorist attack on the U.S. Consulate in Benghazi, Libya, on September 11 2012, in which four Americans were killed. 'If she's wearing a Fresnel prism, then she has double vision without it,' said Dr Mark Fromer, medical director at Fromer Eye Centers.