What is anisocoria pupil?

Mar. 16, 2021. Anisocoria is when your eye’s pupils are not the same size. The pupil allows light to enter the eye so that you can see. Anyone can have pupils that differ in size with no problems.

What are the causes of anisocoria?

What causes anisocoria?

  • direct trauma to the eye.
  • concussion.
  • bleeding in your skull.
  • inflammation of your optic nerve.
  • brain tumor.
  • aneurysm.
  • meningitis.
  • seizure.

What is it when one pupil is bigger than the other?

Anisocoria: This is when one pupil is larger than the other. About 1 in 5 people may have this. Perhaps the best-known person with this condition was the singer David Bowie, whose left eye was permanently dilated after an injury.

Can you fix anisocoria?

People with physiological anisocoria do not usually need treatment, as it is typically harmless. Mechanical anisocoria may require surgery to correct the damage a trauma has caused. If the damage is due to an underlying condition, such as uveitis or glaucoma, a doctor will develop an individualized treatment plan.

Can anisocoria go away?

Simple anisocoria This is a benign condition that causes the pupils to differ in size, usually by up to one millimeter in diameter, without affecting the pupils’ response to light. This condition can be intermittent or constant, and may even go away on its own without medical intervention.

Can migraine cause dilated pupil?

Unilateral pupil dilation presenting with headache can be a sign of serious intracranial pathology. However, a few cases of episodic mydriasis presenting with migraine, lacking an apparent neurologic cause and with a benign course have been described.

Should I be worried about anisocoria?

Physiological anisocoria is when there is a natural, small difference in the size of a person’s pupils. This is not harmful and does not require treatment. However, a sudden and pronounced change in one pupil size can indicate a medical condition.

What drugs cause anisocoria?

Accidental contamination of many drugs, such as cocaine may cause anisocoria. In addition to ocular side effects, cocaine use is associated with a number of complications, involving the cardiovascular, respiratory, neurological, and gastrointestinal systems.

What are the differential diagnoses for anisocoria?

Anisocoria Differential Diagnosis. This condition should be diagnosed in a proper manner, and for this, a number of tests needs to be performed. The differential diagnosis of this disease involves: Adie’s Syndrome. Botulism. Alcohol intoxication. Cerebral Aneurysm. Brain tumor.

What causes unequal pupils?

If the smaller pupil is abnormal, the difference is greater in the dark. Eye disorders that cause unequal pupils include birth defects and eye injury. Also, certain drugs that get into the eye may affect the pupil.

What can cause a fixed pupil?


  • Cardiac arrest
  • Poisoning
  • Hypothermia
  • Deep anesthesia
  • What’s normal pupil size and when do pupils change?

    According to the American Academy of Ophthalmology, pupils generally range in size from 2 to 8 mm . Pupil size also changes based on whether you are looking at something close or far away. When you’re focusing on an object that’s near, your pupils become smaller. When the object is far away, your pupils widen.