Medications, trauma, and medical conditions can lead to abnormally small pupils (miosis).
One common cause of mydriasis is eye dilation for an eye exam.
Symptoms
With miosis, either one or both pupils may be abnormally small.
Illustration by Joules Garcia for Verywell Health
Signs and symptoms of a strokeinclude the sudden appearance of:
How Is Miosis Diagnosed?
You may be able to manage this by protecting your eyes while outside by wearing sunglasses.
Miosis may resolve if the iris, nerves, or brain are not permanently damaged.
For nonprescription or recreational drugs, you may be assessed for substance use disorder.
You may choose to enroll in a substance use treatment program.
Be sure to do so right away to protect your sight.
Determining the cause and treating it can help preserve vision and health.
Optometrists data pipe.Why is my pupil small?
2018;50(1):94106. doi:10.3758/s13428-017-1007-2
Nvision.Why do I have pinpoint pupils?
Pula JH, Kao AM, Kattah JC.Neuro-ophthalmologic side-effects of systemic medications.Curr Opin Ophthalmol.
Although older, this is the best reference found)
MedlinePlus.Clonidine.
American Academy of Ophthalmology.Abnormalities of pupil structure.
American Academy of Ophthalmology.Concerned about dilated pupils?
Causes and treatment
Cedars Sinai.Iritis.
Assil-Gaur Eye Institute.Understanding pupil size, insights on small pupils.
Centers for Disease Control and Prevention.Signs and symptoms of a stroke.
Bascom Palmer Eye Institute.Pupillary abnormalities.
USAgov.Find help for substance abuse.
