Blood Velocity Measurements in Human Retinal Vessels

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Science  29 Nov 1974:
Vol. 186, Issue 4166, pp. 830-831
DOI: 10.1126/science.186.4166.830


Laser Doppler velocimetry was used to measure the velocity of blood in human retinal vessels. The mean flow velocities obtained were 1.9 centimeters per second in a retinal vein and 2.2 centimeters per second in a retinal artery. Scattered light from a weak helium-neon laser beam focused on the vessel was detected by a photomultiplier, and the temporal correlation of the intensity fluctuations was measured with a photon counting autocorrelator. Autocorrelation functions for blood flowing through glass capillaries were used for calibration.