Hi. Welcome to JustAnswer. I am Dr Uzair.I am reviewing your post and will post back with your reply momentarily.
Eye drops which are used to dilate the pupil for screening tests does not cause decrease in blood pressure so the reason can be something else. You need to increase fluid intake and repeat your blood pressure measurement after 2 to 3 hours. Nothing much to worry about as far as your blood pressure is above 100/60.
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