It sounds to me as if someone is trying to sell you some really bad science/medicine. In particular, sleep blindfolds are absolutely counterproductive in treating BEB. You want your eyes to be OPEN, don't you? Why use blndfolds? For the magnets? As far as I have been able to determine, magnets and magnetic fields have NO positive effect on any part of the human body. They only have effect if there is some iron-like metal implanted in the body. Worse, I can imagine the magnets picking up bits of metal like straightpins and causing them to be jammed into your face and eyes. I don't want magnets ANYWHERE NEAR my face.
Even if magnets had some effect on the eyes, it would be unproductive to use them at night, since BEB doesn't cause spasms when you are asleep.