Adie Syndrome: Causes, Symptoms, and Treatment
Medically reviewed by Harsha Moole, MD, Internal Medicine. Last reviewed: October 2, 2026.
What kind of doctor treats Adie Syndrome?
A primary care doctor often makes the first referral. An eye doctor called an ophthalmologist usually confirms the diagnosis. A neurologist may be involved if reflexes or other nerves are affected. A direct primary care or concierge doctor can be a first stop for an evaluation and can refer you to a specialist when needed.
What it is
Adie syndrome is a rare nerve problem that mainly affects one eye. The pupil becomes larger than normal and reacts slowly to light. People with this condition may also lose some reflexes, most often in the knees and ankles. Doctors sometimes call it tonic pupil or Adie's pupil.
Symptoms
The most common sign is a pupil that is bigger than usual in one eye. That pupil may respond very slowly when light changes. Many people also have blurry vision up close, such as when reading. Over time, reflexes in the knees or ankles can weaken or disappear.
Causes and who gets it
Adie syndrome happens when nerve cells that control the pupil are damaged. In many cases, doctors cannot find a clear cause. Some cases seem to follow a viral infection. A few may be linked to an autoimmune reaction. It is more common in women than in men and most often appears in adults between 25 and 45.
How doctors diagnose it
A doctor will look at the pupil with a light and watch how it reacts. A special drop may be used to see if the pupil responds in a way that points to Adie syndrome. The doctor will also test reflexes at the knees and ankles.
Treatment
Most people with Adie syndrome do not need treatment. The condition is not dangerous to the eye or the rest of the body. If blurry vision gets in the way of reading, an eye doctor can prescribe special reading glasses. Drops that make the pupil smaller can also help. Some people find that the pupil slowly returns to a more normal size over months or years.
When to see a doctor
See a doctor if one pupil suddenly becomes larger than the other, or if your vision changes in a way that does not go away. A new large pupil should always be checked, because a few serious conditions can look similar. Get care quickly if the change comes with a bad headache, drooping eyelid, double vision, weakness, or confusion.
How a direct primary care or concierge doctor fits in
A direct primary care doctor charges a flat monthly fee instead of billing insurance for visits. The same is true for a concierge doctor, who usually charges more and often works alongside insurance. These doctors can check the pupil, test reflexes, order tests, and follow your symptoms over time.
Common questions
Is Adie syndrome dangerous?
For most people, it is not dangerous. It does not usually damage the eye or shorten life. The main problems are bothersome vision changes and lost reflexes.
Will my pupil go back to normal?
Some people see the pupil shrink back toward a normal size over months or years. Others keep a larger pupil for a long time. Results differ from person to person.
Can Adie syndrome affect both eyes?
Yes, but this is not common. When it happens, the second eye is usually affected years after the first one.
Do I need surgery?
No, surgery is not used for this condition. Care usually involves glasses, drops, or simple watching over time.
Sources
- NIH Genetic and Rare Diseases Information Center - Holmes-Adie syndrome
- American Academy of Ophthalmology - What Is Adie's Pupil?
Medical Disclaimer
This content is for general educational and informational purposes only and is not medical advice. It is not a substitute for professional medical advice, diagnosis, or treatment, and reading it does not create a doctor-patient relationship. Always seek the advice of your physician or another qualified health provider with any questions about a medical condition, and never disregard or delay seeking professional advice because of something you read here. If you think you may have a medical emergency, call 911 (or your local emergency number) immediately.
