There is no way that you can test the UV protection of your sunglasses at home. The best place you can go to have UV pritection tested is your optometrist's office. Most optical stores have a special machine to test the UV protection of the sunglasses, which is called UV meter. I evey take my old sunglasses to my optician and asked them to test my sunglasses to see whether they have UV protection or not. It turned to have UV protection. However, when you go to choose sunglasses, you should check the UV protection first by seeing the label UV 400. If they don't have the label, you'd better not buy them.