What is Eye Miosis

Eye Miosis is the excessive constriction of the pupil that doesn’t return to normal size. Also called pinpoint pupil.

The black circle at the center of your eye is your pupil. It changes size thousands of times a day. When you’re in dim light, it gets bigger to let in more light. When the light is bright the pupil will shrink to protect your eye and keep light out.

Many things can cause eye Miosis:

  • An eye injury
  • Uveitis
  • Medication side effects
  • Genetics
  • Age
  •  Opioid use
  • Chronic diseases/conditions
  • A stroke
  • Horner’s syndrome
  • Brain injury
  • Lyme disease
  • Emotions can lead to changes in pupil size
  • Severe lack of vitamin D

Miosis is commonly a symptom of something else not a disease in itself. Miosis can occur in one or both eyes. Miosis can be treated by treating the underlying condition. Whatever the underlying cause may be.

If you find your pupils are not adjusting when they are supposed to. You should contact your vision care provider to find the cause, as there are some causes that may be serious. Your eye doctor will take a close look at your eyes in a dark room. The doctor will ask you to look at a faraway object. Then they’ll check:

  • The size and shape of your pupils
  • The size of your eyelid opening
  • Whether your pupils are equal in size
  •  The position of your pupils
  • How your pupils react to bright light

To find out if you have abnormal miosis, your eye care provider will consult with your PCP to come up with a plan to find the cause of your eye Miosis if it is found not to be a visual cause, but something systemic. Then move forward with a specialist if needed.





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