No: Enjoy your coffee or whatever source of caffeine. No testing, and there have been many, show an adverse effect of caffeine on the vision or health of the eye.
Answered 12/16/2015
5.4k views
NO: Excess caffeine has been linked to twitching of the eyelid, but not blurred vision to my knowledge.
Answered 4/3/2014
5.4k views
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