Dialting eyes / 6 year old !?

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So I have no visions problems at all. Hubs does. Our 6 yr old got a referral to a eye dr. Eye dr says he definitely needs glasses . She wants to dilate his eyes in order to get a greater understandingly his vision and his prescription & to be accurate since he’s so young . However I have mixed feelings. How do child react ? How long does it last? Is there anything I should do for him after the process ? It’s all new to me since I do not need glasses . Hubs says he had never gotten eyes dilated before so he doesnt know either . Help ?