• B-Scan-guided, pulsed Doppler ultrasonography of central retinal vessels and ophthalmic arteries of 72 normal subjects gave the following average peak flow velocities: central retinal artery, 9.5±3.1 cm/s; central retinal vein, 5.7±1.5 cm/s; and ophthalmic artery, 31.6±9.0 cm/s. Doppler shifts in the central retinal vessels were absent at intraocular pressures above 80 mm Hg. Ophthalmic artery systolic, middiastolic, and end-diastolic velocities significantly declined as a function of age. The technique is independent of the status of the ocular media, is noninvasive, requires little time, and causes minimal discomfort.
Guthoff RF, Berger RW, Winkler P, Helmke K, Chumbley LC. Doppler Ultrasonography of the Ophthalmic and Central Retinal Vessels. Arch Ophthalmol. 1991;109(4):532-536. doi:10.1001/archopht.1991.01080040100037