INDOCYANINE GREEN ANGIOGRAPHY
Indocyanine Green Angiography is an advanced diagnostic eye imaging service that evaluates the deeper blood vessels beneath the retina. This test uses a special medical dye and high-resolution imaging to study the choroidal circulation. As a result, your ophthalmologist can detect hidden vascular problems that standard retinal photos and scans may not clearly show.
WHAT THIS TEST DOES
This procedure tracks blood flow in the choroid, which is the vascular layer that supports the retina. After a small intravenous dye injection, a specialized camera captures a rapid sequence of images. Because indocyanine green dye binds strongly to blood proteins, it highlights deeper vessels with greater clarity. Therefore, the test reveals leakage, abnormal vessel networks, and blocked circulation patterns.
WHEN DOCTORS RECOMMEND INDOCYANINE GREEN ANGIOGRAPHY
Your eye specialist may request this imaging service when deeper vascular detail is required. In particular, it supports diagnosis and treatment planning for several retinal and macular conditions.
1. Polypoidal choroidal vasculopathy
2. Age-related macular degeneration
3. Central serous chorioretinopathy
4. Choroidal neovascular membranes
5. Unexplained subretinal bleeding
6. Selected inflammatory and tumor-related eye diseases
HOW THE PROCEDURE IS PERFORMED
First, the pupils are dilated with eye drops to allow a clear view of the retina and choroid. Next, a trained staff member places a small intravenous line in the arm or hand. The dye is then injected while the imaging camera records timed photographs. During image capture, you sit comfortably and focus on a target light. Most sessions finish within 20 to 30 minutes.
WHAT YOU MAY EXPERIENCE
Most patients complete the test without difficulty. You may notice a brief warm sensation during dye injection. Occasionally, a mild metallic taste occurs. In addition, temporary blurred vision and light sensitivity follow dilation. Because of this effect, you should avoid driving immediately after the procedure. Vision usually returns to baseline within a few hours.
SAFETY AND PRECAUTIONS
Indocyanine green dye has a well-established safety record in ophthalmic imaging. However, mild side effects such as nausea can occur. Rare allergic reactions are possible, so medical staff monitor you throughout the test. You should report any history of dye allergy, iodine sensitivity, liver disease, pregnancy, or asthma before scheduling. Emergency support and medications remain available on site.
WHY THIS TEST IS IMPORTANT
Indocyanine Green Angiography provides deeper vascular detail than standard retinal imaging alone. Consequently, your ophthalmologist can make more accurate diagnoses and choose more precise treatment strategies. Early detection and targeted monitoring often improve visual outcomes and long-term eye health.