Visual configurations for a head-mounted display (HMD) are evaluated w
ith binocular asymmetry as the defining characteristic. With such a co
nfiguration the optimum compromise between binocular rivalry, weight a
nd usefulness of see-through at night is sought. A dichoptic area of i
nterest and the addition of a window-frame are shown to be simple and
useful aspects of a binocular asymmetric HMD configuration. The dichop
tic area of interest combines a large, low-resolution, image in one ey
e with a small, high-resolution image in the other. A window-frame act
s as a strong fusion lock and improves the visual quality of the binoc
ular image for some configurations.