What causes odd light refraction in the eyes of some people?
by 
cunning stunt who u calling chicken
ANSWERS: 1
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if you are referring to the red eye phenomenon - it's light reflecting off the back of the retinas. light enters through the pupil, and if the pupil is dialated enough, a camera flash can reflect back. human retinas are red, and cat retinas are yellow (which is what you will see at night).
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