Questions tagged [iris]

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Meaning of colored ring around iris

There seem to be various conditions that affect the color of the outer edge of the iris, such as: Fleischer ring - Wikipedia Arcus senilis Kayser–Fleischer ring Limbal ring and I imagine there are ...
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Do hazel-colored eyes change colors (depending on surroundings) or is that an optical-illusion? Why is the hazel pigment so sensitive to light?

Do hazel-colored eyes change colors (depending on surroundings) or is that an optical-illusion? Why is the hazel (and blue) pigment so sensitive to light?
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What is this dot on the iris?

I have a black dot on my iris. Is there a medical term for this? Can it be dangerous?