1. A computer-implemented method comprising: receiving a plurality of images of nominally the same scene; determining whether a particular image, of the plurality of images, comprises a region that includes sub-optimal depictions of one or more eyes; in response to determining that the particular image comprises a particular region that includes sub-optimal depictions of one or more eyes: selecting, from the plurality of images, a particular different image that comprises a certain region that: corresponds to the particular region in the particular image, and does not comprise the sub-optimal depiction of one or more eyes; and generating a combination image based, at least in part, on the particular image and the particular different image; wherein the method is performed by one or more processors of a computing device configured as an optical system.