1. A non-mydriatic fundus imaging system, comprising: an image sensor array including a two-dimensional monochrome complementary metal-oxide-semiconductor, wherein the image sensor array has a plurality of rows of pixels, and the image sensor array is capable of global reset operations wherein each pixel of the plurality of rows of pixels is exposed substantially simultaneously; and an illumination unit operatively coupled to the image sensor array, wherein the illumination unit includes a multi-die light emitting diode, and the illumination unit being capable of overdriving the light emitting diode.