Collie Eye Anomaly (CEA) is a medium-severity eye condition that can affect dogs of all ages and breeds. CEA is a hereditary congenital eye defect affecting collie breeds. It ranges from minor choroidal hypoplasia (mild, no vision loss) to colobomas, retinal detachment, and intraocular haemorrhage causing blindness. Severity does not worsen after birth. It is documented across 5 breeds, though prevalence and severity can differ significantly between them. It typically becomes apparent at Birth. Early signs to watch for include choroidal hypoplasia (pale areas in retina), colobomas (holes in retinal structures), retinal detachment, and intraocular haemorrhage. When treatment is required, costs are estimated at £200-£1,500 depending on severity, location, and the specific intervention needed. Collie Eye Anomaly (CEA) has a hereditary component, so health-screening certificates from the breeder are strongly recommended for predisposed breeds. This page covers symptoms, treatment options, and preventive steps — along with breed-specific information where available.

Signs & Symptoms

The following symptoms are commonly associated with Collie Eye Anomaly (CEA) in dogs. If your dog displays several of these signs, consult your vet promptly — early diagnosis typically leads to better outcomes.

• Choroidal hypoplasia (pale areas in retina)
• Colobomas (holes in retinal structures)
• Retinal detachment
• Intraocular haemorrhage
• Blindness in severe cases

Treatment Overview

There is no treatment for CEA. Laser or cryotherapy can be used to stabilise early retinal detachments in go-normal or mildly affected dogs. Most affected dogs adapt well to their level of vision.

Typical onset: Birth

Prevention & Screening

While not all cases of Collie Eye Anomaly (CEA) can be prevented, the following steps reduce risk or enable earlier intervention:

• DNA test available (NHEJ1 mutation)
• Test all breeding stock — breed only clear dogs or clear-to-carrier pairings

Breeds Affected by Collie Eye Anomaly (CEA)

The following 6 breeds are documented as being susceptible to Collie Eye Anomaly (CEA). Click any breed to view breed-specific information about this condition, including prevalence and recommended screening.

• Rough Collie (large)
• Border Collie (medium)
• Shetland Sheepdog (small)
• Australian Shepherd (medium)
• Miniature American Shepherd (small)
• Nova Scotia Duck Tolling Retriever (medium)