  A near-eye visor is one of the most vital components in a head-mounted
display. Currently, freeform optics and waveguides are used to design near-eye
visors, but these structures are complex and their field of view is limited
when the visor is placed near the eye. In this paper, we propose a flat,
freeform near-eye visor which uses a sub-wavelength patterned metasurface
reflector. The visor design imparts a spatial phase profile on a projected
display pattern and can be implemented using a micron-scale thick metasurface.
As the resulting metaform visor relies on diffraction, it can preserve a large
field of view (77.3{\deg} both horizontally and vertically) when placed only
2.5 cm away from the eye. We simulate the metasurface visor to estimate the
modulation transfer function, and find that the projected image quality is
sufficiently high for human vision. While the design of the metasurface is
initially performed via ray optics, using full-wave finite-difference
time-domain simulation we validate a scaled version of our visor design.
