The black dot in your eye is a hole. It lets light in. When it is bright, the dot gets small. When it is dark, the dot gets big. This helps you see well. 
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Pupillary light reflex.jpg
Voluntary pupil dilation.gif
Human eye in dim light.jpg
Human eye in bright light.jpg
Sepia eyelid shape.theora.ogv
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Content adapted from Wikipedia
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Readability: FK 12.1
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Vital Level 5