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In page Takayasu's arteritis:

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Laser Doppler imaging by near-infrared digital holography can reveal characteristic blood flow waveforms in the central artery and vein of the retina in patients with vascular insufficiency who may exhibit a smooth systo-diastolic pulse in the central retinal artery. This technique enables non-invasive functional microangiography by high-contrast measurement of endoluminal bloodflow profiles in vessels in the posterior segment of the eye with spatial resolution comparable to state-of-the-art indocyanine green angiography.[citation needed]