Systems and methods for constructing a widefield image of the retina from a plurality of retinal images. In one aspect, the disclosure concerns constructing a widefield image of the retina from a plurality of retinal images, comprising a base image and a plurality of peripheral images. These techniques enable medical observations of retinal phenomena in patients, such retinal vein occlusion, artery occlusion, retinal detachments, intraocular inflammation, ocular tumors, and the like, that were difficult to detect and impossible to quantify under prior art approaches.