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A member asked:
How come when im in bathroom and lights are of my pupils are big but the second i cut the lights on there tiny i watch them change ?
A doctor has provided 1 answer
Normal response.: When lights are off, pupils enlarge to allow more of the ambient light to hit the retina so you can see a little better in the darkness. When lights are on, you don't need as much light entering the eyes to see, so the pupils constrict.
Answered 6/22/2015
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