Desirée Patno began seeing double this fall. After two months, the condition has only gotten more pronounced.

It began on the morning of October 30th. Patno remembers the date because she bought a Microsoft Surface Pro 4 tablet the night before. She was on a flight from Los Angeles to Austin, Texas and she was praising the machine, along with the service she’d gotten at the Microsoft Store, to her seatmate when the double vision started.

Her seatmate smiled and pulled out his own Surface Pro 4.
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