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Neurobiologist Susan R. Barry was an adult when she acquired depth perception for the first time.

"Barry had been cross-eyed and stereoblind since early infancy. After half a century of perceiving her surroundings as flat and compressed, on that day she saw the city of Manhattan in stereo depth for first time in her life. As a neuroscientist, she understood just how extraordinary this transformation was, not only for herself but for the scientific understanding of the human brain. Scientists have long believed that the brain is malleable only during a "critical period" in early childhood. According to this theory, Barry's brain had organized itself when she was a baby to avoid double vision - and there was no way to rewire it as an adult. But Barry found an optometrist who prescribed a little-known program of vision therapy; after intensive training, Barry was ultimately able to accomplish what other scientists and even she herself had once considered impossible."

The story shows not only that the brain is malleable, but also that a conscious awareness of experience isn't the same as actually having that experience. As author Bruce Goldstein puts it, "Scientific knowledge is not enough." 

Susan Barry tells her story in her book Fixing My Gaze: A Scientist's Journey Into Seeing in Three Dimensions