The development of the scanning laser ophthalmoscope (SLO), first conceived by Webb et al in 19801 heralded the first widespread application of lasers for retinal imaging. A highly collimated beam from a laser is swept over the retina delivering all its energy to a very small spot for a very short time, typically of the order of some tens of nanoseconds. Light reflected from the spot is detected and synchronously decoded to form an image on a monitor. The use of a laser in this way offers a number of fundamental advantages for retinal imaging: While a number of these factors make imaging simpler there are three major advances that the SLO offers to retinal imaging—the ability to do quantitative imaging, multispectral imaging, and three dimensional imaging. The SLO is inherently a digital imaging …