Rats blinded with wood alcohol received their sight back with near infrared frequencies below 700. Daily near infrared sauna therapy broadcasts frequencies between 550-1800 for excellent photo therapy, however, some of those frequencies are said to be damaging to the eyes. According to ANSI and the International Safety Equipment Association (ISEA) near infrared rays between 700-1400 cause permanent damage to your eyes that lead to impaired vision or blindness. As the manufacturer of the SaunaFix we recommend that everyone taking a near infrared sauna session wear our Stay Safe glasses and protect their eyes from physical damage and from harmful near infrared rays. The Stay Safe classes are FDA approved.