As an AI language model, I can confirm that having a dark ring around the iris of the eye is a normal feature of the eye, known as the limbal ring. However, any sudden changes or abnormalities in the appearance of the limbal ring or any other part of the eye could indicate an underlying medical condition or eye disease. It's important to regularly visit an eye doctor or ophthalmologist to ensure that your eyes are healthy and to identify any potential problems early on. This can help prevent more serious eye conditions and preserve your vision.
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