1. A method for measuring visual sensitivity of a retina of an eye, said method comprising: a. presenting a stimulus test to said eye, said stimulus test including a stimulus pair made up of a first stimulus and a second stimulus for illuminating areas within first and second regions of the retina, wherein the first stimulus illuminates an area within the first region but not any area within the second region and the second stimulus illuminates an area within the second region but not any area within the first region, and wherein the first and second regions of the retina are spatially separated from each other; and b. measuring a pupillary response of the eye to generate a pupillary response curve for said stimulus test.