What if I don't wear my post mydriatic sunglasses?

No harm. These are to provide comfort with the dilated iris. If you do not wear them you might have some discomfort from the light but no harm will be done.

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Need expert advice. What if I don't wear my post mydriatic sunglasses after the appointment?

The bright lights. Will bother you until the pupils return to normal. It will not affect or damage the eyes if you don't wear the given dark lenses.