This case was published in PsyCh Journal in 2015 under the title “Sight and blindness in the same person”. When I first read it I couldn't even believe that something like this was even possible. It is one of the best documented cases of mind body connection ever recorded.
Here is the case of a German woman named BT.
BT suffered from Dissociative identity disorder and was under the treatment of Dr. Bruno Waldvogel. She had at least 10 different personalities each with a different name, gender, voice and temperament.
4 years into her treatment something happened that stunned Dr. Waldvogel. BT, while in the personality of a teenage boy picked up a magazine and started to read.
Nothing shocking right?
But BT was Blind and had been that way for the past 13 years. At the age of 20 she suffered a traumatic accident which doctors initially diagnosed as brain damage to her visual processing centres, the reason they believed she had permanently lost all sight.
So how was she able to see suddenly? How was this even possible?
To investigate this, an EEG was placed on BT's visual cortex to measure her response to visual stimuli. It turned out that BT's vision was switching on and off based on her current personality. This ruled out any possibility of faking as humans cannot control visual cortex electrical activity. It turned out her blindness was never physical, it was psychological.
After intense therapy 8 out of her 10 personalities regained full sight while 2 personalities remained blind. Doctors believed the blind states served as a protective trauma mechanism.
BT's case remains one of the most fascinating in modern times. It serves as a reminder that human brains are capable of extraordinary things much of which is yet to be fully understood.