Medicines for Retinal artery occlusion

What it is

Retinal artery occlusion is a blockage of the artery that supplies blood to the retina — the light-sensitive layer at the back of the eye. Because the retina depends on this blood supply to work and survive, a blockage rapidly deprives it of oxygen, causing sudden loss of vision. It is sometimes called an "eye stroke", because, like a stroke in the brain, it is usually caused by a blockage (often from a clot or debris travelling from elsewhere, such as the neck arteries or heart) cutting off blood flow. Typically it causes sudden, painless loss of vision in one eye — either the whole vision or a part of it, depending on whether the main (central) artery or a smaller branch is blocked. It is a medical emergency: partly because prompt assessment offers the only chance of trying to help the vision (which is time-critical and often limited), but also, very importantly, because a retinal artery occlusion is a major warning sign that the person is at high risk of a stroke (in the brain) and other serious cardiovascular events — so it needs urgent assessment and treatment to reduce that risk, in the same way a "mini-stroke" (TIA) would. Recognising it as an emergency is crucial.

How it is treated

Retinal artery occlusion is a medical emergency needing immediate assessment. Anyone with sudden loss of vision should seek emergency eye care straight away. In the acute situation, there is a limited window in which attempts may be made to try to restore blood flow, though the ability to recover vision is often limited and time-dependent — which is why immediate presentation matters. Crucially, beyond the eye itself, a retinal artery occlusion is treated as equivalent to a stroke or "mini-stroke" (TIA) in terms of the urgent need to assess and reduce the risk of a future stroke or heart problem: this means prompt investigation of the cause (such as scans of the neck arteries and heart, and checking for risk factors like an irregular heart rhythm, high blood pressure, diabetes, and cholesterol), and starting treatment to reduce cardiovascular risk (such as medicines to prevent clots and manage risk factors), usually via urgent referral to stroke or specialist services. In older people, an important cause to exclude urgently is giant cell arteritis (a form of blood vessel inflammation), which needs immediate treatment to protect the other eye. The reassuring — and vital — message is that retinal artery occlusion is a medical emergency: as well as the eye needing immediate assessment, it is a serious warning of stroke risk that requires urgent evaluation and treatment to protect the person from a future stroke.