Only in the US?
This afternoon I saw a programme on amazing medical recoveries.
One lady lost the sight in one eye because of a 100% blockage in a blood vessel in the Retina.
A few years later tests revealed a 75% blockage in the other eye....fearing she'd lose sight completely her brother booked her in for a skydive experience.
When she landed her sight had returned to near normal....it is believed that the pressure and terminal velocity reached (123mph ish)had cleared the blockages.
A lovely story, a happy ending.
Well, the disclaimer came after...when the presenter stated that skydiving is not a cure for blindness.