Fig. 49 India ink preparation of the adult retinal vasculature shows two distinct levels of capillaries. Focus on the upper level (A) shows a clear network of capillaries (solid arrow) in addition to another set of capillaries, which are out of focus (open arrow). B. With the focus adjusted down 42 μm, the previous blurred layer of vessels is not sharply focused (open arrow), whereas the previously sharply focused vessels (solid arrow) are now put out of focus (original magnification ×120; courtesy of Dr. Paul Henkind)