How to determine polarized sunglasses?
The following are the steps to determine polarized sunglasses:
Step 1, take the same two pair polarized sunglasses (the owner claimed the polarized sunglasses).
Step 2, holding a pair of glasses by each hand, first overlap the two glasses horizontally, now you can see the opposite thing through the two overapped lens overlap.
Step 3, place the two glasses “before and after the 90-degree overlap (ie a horizontal overlap).” And then placed the two pair of glasses in front of your eyes, if you can see nothing, then it must be polarized sunglasses.
Note: general sunglasses do not have the characteristics of these functions.