Hey OP! I think what you're experiencing is likely just a symptom of the Methamphetamine usage. I think people are often a little uninformed regarding how easily and quickly paranoia and delusion can set in with the use of stimulants. I've experienced it myself. It's not crazy to think that a person could accidentally get some crystals in their eyes. I bet there would be some irritation and maybe some pain, but we are talking about a very water-soluble substance here, so even if some did end up in the eye, it would be absorbed without causing extensive damage.
Keep in mind, medicine is often administered directly to the eyeball, like Cocaine for instance when used as a local anesthetic. I just mean to say that getting a substance in your eye, although not something to get in the habit of, is not generally a medical emergency.