1. A computer-implemented method comprising: receiving a plurality of images of a same scene captured by a camera; wherein the plurality of images comprises a particular image of the same scene, a preview image of the same scene and a postview image of the same scene; wherein the preview image, from the plurality of images, is an image acquired by the camera just shortly before the particular image was acquired by the camera; wherein the postview image, from the plurality of images, is an image acquired by the camera just after the particular image was acquired by the camera; wherein each of the preview image and the postview image has a resolution different than a resolution of the particular image; wherein each of the preview image and the postview image depicts the same objects and subjects as those depicted in the particular image of the plurality of images; determining whether the particular image, of the plurality of images, comprises a particular region that includes a defective depiction of one or more eyes; in response to determining that the particular image comprises the particular region that includes the defective depiction of the one or more eyes: selecting, either the preview image or the postview image that comprises a certain region; wherein: the certain region includes a non-defective depiction of the one or more eyes; and the certain region corresponds to the particular region in the particular image; and generating a combination image based, at least in part, on the particular image and the certain region by replacing the particular region in the particular image with the certain region; wherein the method is performed by one or more processors of a computing device configured as an optical system.