Nope, not true at all. Go to eyebuydirect.com, enter any random prescription and buy those glasses. I've done this like 20 times, mostly because my prescriptions were from doctors outside United States.
It's an American company. AFAIK there is no regulation in the US that requires prescription from a doctor to get the glasses.
It's an American company. AFAIK there is no regulation in the US that requires prescription from a doctor to get the glasses.