An apparatus for use with a head wearable display, the apparatus comprising: a curved eyepiece for guiding display light received at an input surface peripherally located from a viewing region and emitting the display light along an eye-ward direction in the viewing region, the curved eyepiece including: a curved lightguide to guide the display light via total internal reflections from the input surface to the viewing region; an eye-ward facing surface that is concave; a world facing surface that is convex and opposite the eye-ward facing surface; and an optical combiner disposed at the viewing region to redirect the display light towards the eye-ward direction for output from the curved lightguide, wherein the optical combiner is partially transmissive to ambient light incident through the world facing surface such that the viewing region is see-through; a prism disposed proximate to the input surface to pre-compensate the display light, prior to passing through the input surface, for lateral chromatic aberrations resulting from refractions when entering and exiting the curved lightguide; and an adjustable mount for mounting the prism relative to the curved lightguide, wherein the adjustable mount allows the prism to slide laterally relative to the input surface to adjust a focus of the display light output from the curved eyepiece in the viewing region. a curved eyepiece for guiding display light received at an input surface peripherally located from a viewing region and emitting the display light along an eye-ward direction in the viewing region, the curved eyepiece including: a curved lightguide to guide the display light via total internal reflections from the input surface to the viewing region; an eye-ward facing surface that is concave; a world facing surface that is convex and opposite the eye-ward facing surface; and an optical combiner disposed at the viewing region to redirect the display light towards the eye-ward direction for output from the curved lightguide, wherein the optical combiner is partially transmissive to ambient light incident through the world facing surface such that the viewing region is see-through; a curved lightguide to guide the display light via total internal reflections from the input surface to the viewing region; an eye-ward facing surface that is concave; a world facing surface that is convex and opposite the eye-ward facing surface; and an optical combiner disposed at the viewing region to redirect the display light towards the eye-ward direction for output from the curved lightguide, wherein the optical combiner is partially transmissive to ambient light incident through the world facing surface such that the viewing region is see-through; a prism disposed proximate to the input surface to pre-compensate the display light, prior to passing through the input surface, for lateral chromatic aberrations resulting from refractions when entering and exiting the curved lightguide; and an adjustable mount for mounting the prism relative to the curved lightguide, wherein the adjustable mount allows the prism to slide laterally relative to the input surface to adjust a focus of the display light output from the curved eyepiece in the viewing region. <EOS>