1. An imaging system for a head-mounted display, said head-mounted display comprising a headgear structure to be worn on the head of a person, said imaging system comprising: means for projecting a source image within the headgear structure; an incurvate projection surface positioned within the headgear structure for displaying the projected source image; and a first lens proximate the person's eye for re-imaging the projected image displayed on said incurvate projection surface as a wide field virtual image, wherein said means for projecting a source image comprises a second lens having an aperture size sufficient to image the projected image onto the incurvate projection surface, said aperture size being independent of an exit pupil of said first lens.