Several hours: Usually 4 to 6 hours for standard dilating eye drops, but sometimes a eye Doc will use dilating agents that can last for 8-12 hours. This latter agent also will affect focus to a greater degree and make your vision with contacts noticeably blurry. Fortunately the eye drops will reverse and you should be back to normal by tomorrow. If not just call your doc and he/she can advise you. Good luck.
Answered 1/17/2019
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