1. A non-invasive device for acquiring an ocular image, comprising: an optic assembly comprising one or more light sources and a lens; an imaging system; a linear activator to focus the optic assembly; wherein the imaging system acquires an ocular image that is processed to extract one or more ocular features from the ocular image; wherein a rate of change map is applied, wherein the rate of change map comprises: (1) for each pixel, determining an average of the sum of the differences of the current pixel or taking a mean difference of the current pixel using a matrix that has the current pixel as the center; (2) recording this value if this value is above a threshold, otherwise setting this value to 0; and (3) creating a map with white edges and most of the picture is black; wherein the one or more ocular features are compared to a standard and used to identify existence of one or more ocular abnormalities, specify a type and extent of the one or more ocular abnormalities, and correlate the type and extent of the one or more ocular abnormalities to a disease state.