Authentic Sunglasses

How can I check if my Sunglasses are authentic Prada.?
I have these blue, gradient aviators. My friend from Italy gave them to me a very long time ago. Today, for fun, I decided to type into google what was written on the sides.
“Mod PR55″ on the left side and “Made in Italy” on the right.
I tried to find the particular model online but no luck.
Mines has the same thing but they are coach and perscripton, they are also 100 % percent real and I cant find them online.
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