Lens offer the maximum UV 400 protection which blocks 100% UVA, UVB and harmful blue light from you eyes.
There is no way to check u/v lenses.You got to trust what is written on it or told by the seller.Remember onething making lenses u/v protection hardly costs more.
The sun.
Sunglasses has antiuv ray lens that can greatly protect our eyes from extreme rays of the sun.
The guys there may help you get in your sunnies from reputable sellers and somewhere on the guys there may help you clear it up.