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2. Pupillary light reflex - Wikipedia

   en.wikipedia.org/wiki/Pupillary_light_reflex

   The pupil is the dark circular opening in the center of the iris and is where light enters the eye. By analogy with a camera, the pupil is equivalent to aperture, whereas the iris is equivalent to the diaphragm.

3. Eye disease - Wikipedia

   en.wikipedia.org/wiki/Eye_disease

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