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What Is Polycoria?

Polycoria is an extremely rare ocular condition characterized by the presence of more than one pupillary opening in the iris of a single eye. While most humans have a single central pupil to regulate light, individuals with polycoria appear to have two or more distinct holes. These additional pupils may be present from birth (congenital) or result from later injury or disease. Depending on the size and location of the extra openings, the condition can cause significant visual disturbances, including blurred vision, glare, and "ghost images" (diplopia).

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What Is Polycoria?

Polycoria is an extremely rare ocular condition characterized by the presence of more than one pupillary opening in the iris of a single eye. While most humans have a single central pupil to regulate light, individuals with polycoria appear to have two or more distinct holes. These additional pupils may be present from birth (congenital) or result from later injury or disease. Depending on the size and location of the extra openings, the condition can cause significant visual disturbances, including blurred vision, glare, and "ghost images" (diplopia).

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True vs. Pseudopolycoria

Medical professionals categorize polycoria into two distinct types based on the structure of the iris:

True Polycoria - This is the rarest form. In true polycoria, each extra pupil is a complete, independent hole surrounded by its own functional sphincter muscle. This means all the pupils can constrict and dilate simultaneously in response to light.

Pseudopolycoria (False Polycoria) - This is more common and involves "holes" in the iris that do not have their own sphincter muscles. These are often just gaps or tears in the iris tissue that look like extra pupils but do not react to light independently. They are often caused by trauma, inflammation, or conditions like Axenfeld-Rieger syndrome.

Visual Impact: The "Bridge" Effect

In true polycoria, the multiple pupils are typically separated by a thin "bridge" of iris tissue. Because light enters the eye through multiple apertures, the retina receives several overlapping images. This often leads to monocular polyopia, where the patient sees multiple images of a single object even when the other eye is covered. Patients also frequently report extreme light sensitivity (photophobia) because the iris cannot effectively block out excess light.

Associated Iris Anomalies

Polycoria is rarely an isolated finding and is often associated with other structural issues in the eye. These may include:

  • Corectopia - A condition where the main pupil is not in the center of the iris.
  • Polar Cataracts - Opacities in the lens that often accompany congenital iris defects.
  • Glaucoma - Structural iris issues can sometimes interfere with the eye's drainage angle, leading to high internal pressure.

The Role of Pupilloplasty

If polycoria does not affect a patient's vision, no treatment is necessary beyond regular monitoring. However, if the multiple images or glare become debilitating, a surgical procedure called pupilloplasty is performed. During this surgery, the surgeon cuts the small bridge of tissue separating the pupils, effectively merging them into one larger, single pupil. This eliminates the "double" light entry and significantly improves visual clarity and comfort.

FAQs on Polycoria

Is it the same as a torn iris?

Not exactly. A torn iris (iridodialysis) usually occurs at the very edge where the iris meets the wall of the eye, often due to blunt trauma. Polycoria involves holes within the body of the iris itself.

Can I wear contact lenses?

Yes. Many patients use "prosthetic" colored contact lenses. These lenses have a painted iris that covers the extra holes, allowing light to enter only through the central pupil, which instantly resolves glare and ghosting.

Is it hereditary?

Some congenital cases are linked to genetic syndromes like Axenfeld-Rieger, which can be passed down. However, many cases occur sporadically without a family history.

When to See Your Eye Doctor

If you notice a change in the shape of your pupil or see an additional hole forming in your iris after an injury or surgery, you must see an ophthalmologist. New holes in the iris can sometimes indicate internal inflammation or high eye pressure that needs immediate management.

References

https://eyewiki.aao.org/Polycoria https://pubmed.ncbi.nlm.nih.gov/24451000/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5020117/ https://www.aao.org/eye-health/diseases/what-is-polycoria