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Yes, they test for glaucoma which usually consists of using a puff of air into each eye. It doesn't hurt, it just feels like someone blowing into your eyes.

It's normal for a bit of redness and swelling to occur after any type of body piercing. If it's infected, possibilities could range from excessive redness, prolonged bleeding or changes in skin color...

I think it would be okay to get a cartilage piercing at any age as long as the proper methods are taken to prevent any infections. Cartilage is harder to pierce and it also hurts more than it would...