2-3 hours: Bad thing about visine is that it will keep the red away by constriction blood vessels for a most a few hours, but then causes vasodilation which makes the eyes more red which makes you put more in--vicious cycle and not good for eyes. Better to see your eye doc and see why eyes are red and treat that.
Answered 3/24/2013
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A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
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