High-tech coating:
The inside of each end of the lens is coated with a high-tech coating that allows the wearer to see the behind view out of the corner of the eye without having to look back.
When monitoring a suspect, wearing these glasses make you less obvious as you can monitor with your head turned the other way.
Great for preventing anyone from sneaking up on you or escaping when your back is turned.
Not to be confused with other lesser quality novelty glasses