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A member asked:
Is it normal for your pupils to "pulse"? they grow slightly smaller and bigger with no change in light hitting them. is this a focussing thing?
A doctor has provided 1 answer
It can be normal: Pupils get bigger and smaller not just to light intensity, but also when changing focus from near to distant objects (or vice versa), and of course when a person has emotional changes such as excitement, or is doing cognitive thinking tasks (using brain power).
Answered 12/17/2019
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