Hillary Clinton appears to be wearing eyeglasses designed to treat double vision. The secretary of state – who recently was hospitalized after a concussion from a fall and blood clot near her brain – appeared before the Senate this week wearing something called a Fresnel prism on her glasses.      

The device is an adhesive panel placed on eyeglass lenses to treat double vision. Clinton’s spokesperson confirmed that she is wearing the glasses as a result of the concussion she suffered, but he did not elaborate.  

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“If she’s wearing a Fresnel prism, then she has double vision without it,” Dr. Mark Fromer told the New York Daily News. To read more, click here.