1. A method to evaluate the health of an eye surrounding the fovea using optical coherence tomography (OCT) angiography, comprising: acquiring a cluster of circular scans at a fixed distance from the fovea; processing the cluster of circular scans to generate vasculature information of the region of the eye; calculating a metric based upon the density of vessels as a function of distance from the fovea or foveal avascular zone using the generated vasculature information; comparing the calculated metric with a collection of metrics calculated from OCT angiography data acquired on eyes having normal vasculature, said comparing step to evaluate the health of the eye; and storing or displaying the results of the comparison or a further analysis thereof.