Serial LTA images of normal choriocapillaris in posterior regions (area A in
Fig. 5 ). Retinal vessels (
arrowhead) were discernible due to dim background pseudofluorescence of the fundus, although the fluorescence level remained unchanged. Light from the IR laser (
arrow), with a power of 20 mW, was aimed at a juxtafoveal location (just temporal to fovea) of a monkey fundus and kept there for 4.30 seconds. Laser application started at time 0. Images were obtained at the following times (in seconds): (
A) 0.30, (
C) 2.00, (
D) 4.00, and (
E) 4.60. (
B) and (
F) are schematic representations of (
A) and (
E), respectively. In the filling phase (
A), discrete spots of fluorescence (
B,
white spots), away from the laser-delivery site, appeared and expanded radially into the surrounding area (refer to
Fig. 9 ). Note that fluorescence in images (
C) and (
D) were practically the same (plateau phase). After the light from the laser was turned off at time 4.30, draining patterns were observed (
E). In the draining phase, blood flow with fluorescent dye was replaced gradually by fresh blood flow without dye (
F,
black spots), showing a honeycomb pattern. In (
F), the
thick white line represents a borderline of a cluster of lobules fed by a common arteriole, whereas the
thin white lines represent borderlines of lobules. Note that locations of
white spots and
black spots correspond well with each other.