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What Is Birdshot Chorioretinopathy?

Birdshot chorioretinopathy is a rare autoimmune eye disease that causes inflammation of the retina and choroid, the layers responsible for vision and blood supply in the eye. The name comes from the cream-colored spots seen at the back of the eye that resemble the scatter pattern of birdshot pellets. This condition affects both eyes and can lead to gradual vision changes over time. Early diagnosis and consistent management help prevent lasting vision loss.

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What Is Birdshot Chorioretinopathy?

Birdshot chorioretinopathy is a rare autoimmune eye disease that causes inflammation of the retina and choroid, the layers responsible for vision and blood supply in the eye. The name comes from the cream-colored spots seen at the back of the eye that resemble the scatter pattern of birdshot pellets. This condition affects both eyes and can lead to gradual vision changes over time. Early diagnosis and consistent management help prevent lasting vision loss.

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What Causes Birdshot Chorioretinopathy?

The exact cause is not fully understood, but it is linked to an abnormal immune reaction against the body's own retinal tissue. Most patients with this condition test positive for a genetic marker called HLA-A29, which increases susceptibility. Environmental triggers such as infections or immune stress may contribute to its onset. The condition occurs more often in middle-aged adults and is slightly more common in women.

What Are the Symptoms of Birdshot Chorioretinopathy?

Common symptoms include blurry vision, floaters, and sensitivity to light. Many people notice problems with night vision and color perception. Some experience distorted central vision or difficulty seeing fine details. Because symptoms develop slowly, regular eye exams are important for detecting inflammation early.

How Is Birdshot Chorioretinopathy Diagnosed?

Diagnosis usually includes:

  • A detailed dilated eye exam to identify characteristic light-colored spots on the retina
  • Fluorescein angiography or indocyanine green angiography to assess blood vessel leakage
  • Optical coherence tomography (OCT) to check for retinal swelling
  • A blood test for the HLA-A29 gene to support diagnosis

How Is Birdshot Chorioretinopathy Treated?

Treatment aims to control inflammation and protect vision. Corticosteroid eye drops or oral medications are used to manage active flare-ups. Long-term therapy often includes immunosuppressive drugs to reduce immune activity. In resistant cases, biologic agents such as adalimumab can help maintain disease control. Regular monitoring ensures that inflammation remains under control and side effects are minimized.

When to See an Eye Specialist

If you experience glare, night vision problems, or difficulty seeing color contrast, schedule an exam. These symptoms may reflect inflammation related to birdshot chorioretinopathy. Early diagnosis helps protect the retina and control flare-ups. Regular monitoring is especially helpful for maintaining long-term vision. Prompt care supports better treatment response.

Frequently Asked Questions

Why is HLA-A29 testing discussed with birdshot chorioretinopathy?

Many people with birdshot test positive for HLA-A29, so the result can support the diagnosis. It is not the only factor, since clinical findings and imaging still matter. A positive result can help separate birdshot from similar uveitis conditions. Your doctor will interpret the test alongside exam results.

What complications can threaten vision in birdshot?

Macular edema can blur central vision and reduce contrast. Retinal vessel inflammation can lead to damage over time. Some people develop optic nerve changes that affect clarity and color vision. Ongoing monitoring aims to catch these issues early.

Why can night vision feel worse with birdshot?

Inflammation can affect retinal function that supports low-light vision. Contrast sensitivity can drop, making dim environments harder to navigate. Glare and haze can also feel stronger at night. Testing such as visual fields and ERG can help measure functional change.

How is treatment response monitored over time?

OCT can track swelling and retinal layer health. Angiography can show blood vessel leakage and inflammation activity. Visual field testing can measure subtle blind spots. Some clinics also use ERG to track retinal function trends across visits.

References

1. Birdshot Retinochoroidopathy. EyeWiki. https://eyewiki.org/Birdshot_Retinochoroidopathy. Accessed January 16, 2026.

2. Birdshot Retinopathy. StatPearls, NCBI Bookshelf. https://www.ncbi.nlm.nih.gov/books/NBK554416/. Accessed January 16, 2026.

3. Clinical Follow-Up of Birdshot Chorioretinopathy. American Academy of Ophthalmology (EyeNet). https://www.aao.org/eyenet/article/clinical-follow-up-birdshot-chorioretinopathy. Accessed January 16, 2026.

4. Major Review Birdshot Chorioretinopathy. Survey of Ophthalmology (ScienceDirect). https://www.sciencedirect.com/science/article/abs/pii/S0039625705001347. Accessed January 16, 2026.

5. HLA-A29 and Birdshot Uveitis: Further Down the Rabbit Hole. Frontiers in Immunology. https://www.frontiersin.org/journals/immunology/articles/10.3389/fimmu.2020.599558/full. Accessed January 16, 2026.

6. Birdshot chorioretinopathy: What's new. Retina Specialist. https://www.retina-specialist.com/article/birdshot-chorioretinopathy-whats-new. Accessed January 16, 2026.