  We performed non-invasive video imaging of retinal blood flow in a pigmented
rat by holographic interferometry of near-infrared laser light backscattered by
retinal tissue, beating against an off-axis reference beam sampled at a frame
rate of 39 kHz with a high throughput camera. Local Doppler contrasts emerged
from the envelopes of short-time Fourier transforms and the phase of
autocorrelation functions of holograms rendered by Fresnel transformation. This
approach permitted imaging of blood flow in large retinal vessels (30 microns
diameter) over 400 by 400 pixels with a spatial resolution of 8 microns and a
temporal resolution of 6.5 ms.
