How Do You Know If Your Aviator Sunglasses Are Blocking UV Rays?

I learned to fly while I was in the USAF, not as a military pilot, but rather taking flying lessons at a nearby airport while I was receiving training from the Air Force in Texas. After I left the Air Force I attended Michigan State University where I continued to acquire advanced pilot ratings while studying Political Science. I had thought I would pursue a career as a diplomat.

Turned out that in those days if you weren’t from an ivy league college and weren’t connected a career in the State Department was not for a kid from the mid-western farm country.

So I decided to fly for a living, and in time became the chief pilot for a small company in Battle Creek, Michigan. This company was in the insurance business, and so in 1976 I started my own aviation insurance business which I sold in 2004.

Which led me to my current business, which is selling aviator sunglasses. As this business grows I am confronted with more and more interesting questions about sunglasses for pilots, and just recently I received the following inquiry:

From: Kyle ***
Sent: Friday, January 13, 2012 8:49 PM
To: customerservice@johnmichaelenterprisesllc.com
Subject: RE: Your Sunglasses Have Shipped!

John,

I recieved the sunglasses. I’m currently a pilot flying in Afghanistan. I’m curious if some lenses block more sunlight out more than others. I have the mirrored lenses and I can’t tell the difference between when I put the glasses on and when I have them off. There seems to be no filter of UV rays. They look and feel great under my headset though. Thanks for any information.

Kyle

This question brings up an interesting question: how do you know if your aviator sunglasses are blocking uv rays?

Randolph Engineering Aviator Matte Chrome Grey Lens Bayonet Temple Sunglasses

Randolph Engineering Aviator Matte Chrome Grey Lens Bayonet Temple Sunglasses

The visible light portion of the electromagnetic spectrum runs from ~390nm (390 nanometers) to 750nm while ultraviolet rays range from

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