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How do fluorescein and indocyanine green (ICG) angiography differ?

Fluorescein angiography is the best way to examine the blood vessels in the retina, but choroidal blood vessels are hidden beneath a layer of colored cells in the retina. The best way to view the choroidal vessels is with indocyanine green (ICG) angiography. The infrared light released by the ICG dye can be seen through the colored cells.

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