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0:59
YouTube
PEN Academy
What is the Iris? Eye Color & Function Explained in 59 Seconds!"
"The iris is the colored part of the eye that controls the amount of light entering the pupil. Acting like a camera shutter, the iris expands and contracts to adjust to different lighting conditions. But did you know it also determines your eye color? In just 59 seconds, learn how this vital structure helps regulate vision and protects the ...
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