Human eye showing close-up of blue iris and pupil - Stock Image - F024/0271 - Science Photo Library

Human eye showing close-up of blue iris and pupil. The iris, a coloured muscular ring, regulates the amount of light that enters the eye through the pupil. CRISTINA PEDRAZZINI/SCIENCE PHOTO LIBRARY

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Human eye showing close-up of blue iris and pupil - Stock Image

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