![]() Seeing a doctor about abnormal pupil changes is important because they can affect your vision. Treatment for dilated pupils depends on the underlying cause. It is often accompanied by impaired vision. Your oculomotor nerve controls pupil constriction. Cranial Nerve NeuropathyĬranial nerve neuropathy is the gradual deterioration of nerves that connect to your eye. Adie’s SyndromeĪlso known as Adie’s pupil, this rare neurological condition causes abnormal dilation in one or both eyes. This can change pupil size and impair vision. MCNP happens when blood flow to the nerves serving your eye is blocked. In addition to trauma, eye injuries can result from certain surgical procedures, such as cataract removal. This often causes one eye to dilate, commonly called a "blown pupil." Common causes include:Īn eye injury that damages the muscles or nerves in the iris can cause pupil dilation. Traumatic Brain InjuryĪ brain injury can increase your intracranial pressure and damage the iris. However, you should undergo a comprehensive eye exam to ensure your eyes and nervous system are healthy. Other symptoms include:īEUM itself is not dangerous. The larger pupil usually returns to normal size in a few hours or days. Benign Episodic Unilateral Mydriasis (BEUM)īEUM is a temporary condition that causes one pupil to dilate. Pupil dilation can also be a sign of withdrawal from these drugs. Recreational drugs that can cause mydriasis include: Anti-nausea and motion sickness medications such as Dramamine.Various prescription and over-the-counter medications can cause pupil dilation, including: Potential causes of mydriasis include: Medications In other cases, it can result from medication or an underlying condition, especially if it’s prolonged or unusual. Pupil dilation often occurs on its own, with no other causes. Mydriasis can be a sign of serious conditions that affect the brain, such as: You could have a medical emergency on your hands. However, if the pupils remain dilated or are unequal in size, seek care from your ophthalmologist. ![]() Pupils may dilate in response to various stimuli under completely normal circumstances. Pupils are supposed to dilate it’s a natural response to low-light situations.
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