Vet Guide to Collie Eye Anomaly in Dogs 2025 🐶👁️

Vet Guide to Collie Eye Anomaly in Dogs 2025 🐶👁️

By Dr. Duncan Houston BVSc

Collie Eye Anomaly (CEA) is a congenital, inherited eye disorder affecting Collies and related breeds. In this 2025 guide, I explain the genetic causes, typical eye abnormalities, diagnosis, lifelong management, and breeding considerations to support optimal canine eye health. 💡

📍 What Is Collie Eye Anomaly?

• CEA (also called choroidal hypoplasia) is a congenital defect present at birth due to incomplete development of blood vessels beneath the retina.
• The anomaly is bilateral but may affect each eye differently. It stems from an autosomal recessive gene mutation (in NHEJ1).
• A range of abnormalities may occur: pale choroid, retinal folds, coloboma (retinal hole), retinal detachment, hemorrhage—severity varies.

⚠️ Which Breeds Are Affected?

• Most common in Rough and Smooth Collies, Shetland Sheepdogs, Border Collies, Australian Shepherds, and Nova Scotia Duck Tolling Retrievers.

📝 Clinical Signs & Impact

• Often mild—with no immediate vision issues—but colobomas or retinal detachment can cause sudden blindness.
• Visible signs: microphthalmia (small eyes), enophthalmia (sunken eyes), vision impairment, bumping into objects.
• Blindness is usually painless, though secondary glaucoma may develop, causing pain and requiring treatment.

🔬 Diagnosis & Screening

• Ophthalmoscopic exam by 6–8 weeks reveals choroidal hypoplasia; beyond this “go‑normal” period, pigment can mask the lesion.
• Veterinary ophthalmologists use dilated fundus exams to identify retinal changes like colobomas or hemorrhages.
• Genetic testing (DNA swab) identifies carriers and affected dogs—important to guide breeding.

✅ Treatment & Management

• No cure exists for CEA itself.
• Laser surgery may prevent progression of early retinal detachment.
• Supportive care for affected dogs includes monitoring for glaucoma or eye discomfort, adapting environment, and ensuring safety.

🧬 Breeding & Prevention

• CEA is autosomal recessive—both parents must carry the gene for affected puppies.
• Responsible breeding involves genetic testing and early eye exams to avoid breeding affected or carrier dogs together.
• Selective breeding has reduced CEA prevalence over decades, though pigment can mask mild cases post‑puppyhood (“go‑normal”).

📊 Summary Table

✅ Vet Tips by Dr Duncan Houston BVSc

• 🔍 Perform ophthalmic exams at 6–8 weeks to detect early lesions before pigmentation masks them.
• 🧪 Use commercial DNA testing and screen breeding dogs to prevent passing on defective genes.
• 📆 Even asymptomatic dogs need annual eye checks to monitor for late-onset complications.
• 🏠 Make living environments safe and consistent to support dogs with visual impairment.

If your dog is of a Collie or herding breed and has atypical eyes or vision issues, schedule an evaluation via the AskAVet.com app.🐾❤️