R R

What Is Coats' Disease?

Coats' Disease is a rare, non-hereditary condition of the eye involving abnormal development of the retinal blood vessels. It is characterized by telangiectasia (dilated, "light-bulb" shaped capillaries) and aneurysms that leak lipids and fluid into and behind the retina. This accumulation of yellowish fluid, known as exudation, can cause the retina to swell and eventually detach. The disease is typically "idiopathic," meaning it occurs spontaneously without a known cause. It most commonly affects young males (85% of cases) and is almost always unilateral, affecting only one eye.

Link to This Resource Page

Provide a valuable resource to your clients or customers by linking to this resource page. Just place the following link on your website.

To display this...

What Is Coats' Disease?

Coats' Disease is a rare, non-hereditary condition of the eye involving abnormal development of the retinal blood vessels. It is characterized by telangiectasia (dilated, "light-bulb" shaped capillaries) and aneurysms that leak lipids and fluid into and behind the retina. This accumulation of yellowish fluid, known as exudation, can cause the retina to swell and eventually detach. The disease is typically "idiopathic," meaning it occurs spontaneously without a known cause. It most commonly affects young males (85% of cases) and is almost always unilateral, affecting only one eye.

read more about coats Disease ...

Copy this HTML:

Copy HTML Copied!

Leukocoria (The White Reflex)

The most common way Coats' Disease is discovered is through leukocoria. In a healthy eye, a camera flash produces a "red-eye" effect. In an eye with Coats' Disease, the massive amount of yellow lipid exudate behind the retina reflects the light as white or yellow. Because children rarely complain of vision loss in only one eye, parents often first notice the condition in flash photography or during a school vision screening. It is a critical "masquerader" of retinoblastoma (eye cancer), making immediate professional diagnosis vital.

Staging and Progression

Ophthalmologists use a staging system to track the severity of Coats' Disease:

Stage 1: Only abnormal vessels (telangiectasia) are present without leakage.

Stage 2: Vessels begin to leak lipids (exudation). Stage 2B involves the macula, threatening central vision.

Stage 3: The accumulation of fluid causes a partial or total retinal detachment.

Stage 4: The eye develops high pressure (glaucoma) or cataracts due to the total detachment.

Stage 5: The eye is blind and may become painful or shrunken (phthisis bulbi).

Mechanism: The Blood-Retinal Barrier

The primary defect in Coats' Disease is a breakdown of the blood-retinal barrier. In a healthy eye, retinal vessels are "tight" and do not leak. In Coats', the endothelial cells lining the vessels are incompetent. This allows the liquid portion of the blood and fats (lipids) to seep out into the subretinal space. As this "sludge" builds up, it physically pushes the retina away from its blood supply, leading to the death of photoreceptor cells and permanent vision loss.

Treatment: Lasers and Freezing

The goal of treatment is to close the leaking vessels to stop the "faucet."

Laser Photocoagulation: A targeted laser is used to cauterize and destroy the abnormal vessels.

Cryotherapy: For vessels that are too far in the periphery or obscured by fluid, a freezing probe is used to scar and close the leaky areas.

Anti-VEGF Injections: Medications may be injected into the eye to reduce swelling and help the body reabsorb the leaked fluid.

Surgery: If the retina is fully detached, a vitrectomy or scleral buckle may be necessary to reattach the tissue.

FAQs on Coats' Disease

Is it a form of cancer?

No. While it looks similar to retinoblastoma (a childhood eye cancer), Coats' Disease is purely a vascular (blood vessel) disorder and is not life-threatening.

Will my other child get it?

No. It is not considered a genetic or hereditary disease. There are no known instances of it running in families.

Can vision be restored?

If caught early (Stage 1 or 2A), vision can often be preserved. If the macula has already been detached or scarred by lipids, the goal of treatment shifts to saving the physical eye rather than restoring 20/20 sight.

When to See Your Eye Doctor

If you notice a "glow" or a white/yellow reflection in your child's pupil in photos, or if you notice their eye drifting (strabismus), you must see a pediatric ophthalmologist immediately. Early detection is the only way to prevent total retinal detachment.

References

https://eyewiki.aao.org/Coats_Disease https://pubmed.ncbi.nlm.nih.gov/11440531/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4112022/ https://coatsdiseasefoundation.org/