Retinal angiography
Retinal angiography: a key examination for exploring ocular blood circulation
Retinal angiography is an imaging test used to analyze blood flow in the retina and choroid, two structures essential to vision. It can detect vascular anomalies that are not always visible during a simple ophthalmological examination.
What is retinal angiography?
Retinal angiography is an imaging test in which a fluorescent dye is injected into a vein in the arm, followed by a series of photographs of the back of the eye using specialized equipment. This procedure enables precise visualization of blood circulation in the retina and choroid. There are two main types of angiography: fluorescein angiography, to study the vessels of the retina, and indocyanine green angiography, more suitable for analyzing the choroid, the vascular layer beneath the retina.
Why is this test carried out?
This examination is indicated in the diagnosis and follow-up of several ocular pathologies, including :
Visit age-related macular degeneration (AMD),
Visit diabetic retinopathy,
Visit retinal vein or artery occlusions,
Visit eye inflammations (uveitis),
Some vascular malformations of the retina.
How does the exam work?
The examination takes around 20 to 30 minutes. After dilating the pupils with eye drops, the dye is injected, and high-resolution images are taken at regular intervals to follow the course of the dye through the vessels of the eye. The examination is painlessSome people may experience a slight transient nausea after the injection.
Are there any risks?
Angiography is generally well tolerated. Possible side effects include:
From transient nausea,
A temporary yellowing of the skin or urine,
Rarely does a allergic reaction to the dye, which may require immediate medical attention.
This is why a medical examination is always carried out beforehand to detect any contraindications.
Interest of angiography in therapeutic follow-up
In addition to diagnosis, angiography can be used to monitor the development of retinal diseases and assess the effectiveness of treatments (intravitreal injections, laser, surgery). It provides a precise map of affected areas, guiding treatment decisions.
Retinal angiography is a fundamental examination in the management of ocular vascular disorders. Although it requires an injection, it remains a safe and valuable procedure for preserving visual health and preventing irreversible vision loss.
