Dilated pupils (mydriasis) are naturally caused by changes in light. They can also be a response to emotional factors, a result of a traumatic injury or a reaction to eye drops, drugs or medication.
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Can sunlight harm my retina, when my pupils have been dilated for
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dilated pupils causes and treatments
Episodic bilateral mydriasis. Both pupils dilated during an
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Dilated Pupils (Mydriasis): Causes, Treatment, When to See a Doctor