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: an eye-ward facing surface that is concave; a world facing surface that is convex and opposite the eye-ward facing surface; a curved lightguide disposed between the eye-ward facing and world facing surfaces to guide the display light via total internal reflections from the input surface to the viewing region; a first lens body on which the input surface is disposed and in which the curved lightguide extends from the input surface to a transition surface, wherein the transition surface is disposed at a transition between a thin portion of the first lens body and a thick portion of the first lens body; and a second lens body having a thin portion, a thick portion and a transition surface and being mated to the first lens body, wherein the transition surface of the second lens body is disposed at a transition between the thin portion and the thick portion of the second lens body, and wherein an optical combiner is disposed along an interface between the transition surfaces of first and second lens bodies (125, 130) at the viewing region to redirect the display light towards the eye-ward direction for output from the curved lightguide; characterized in that the optical combiner includes a two-dimensional grid pattern of reflective elements formed on one or both of the transition surfaces (415, 430), the reflective elements being separated by interstitial regions, comprising gaps on the respective transition surface between the reflective elements in a two-dimensional grid pattern; wherein the reflective elements reflect the display light and the interstitial regions pass ambient light incident through the world facing surface such that the viewing region is partially see-through. 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: an eye-ward facing surface that is concave; a world facing surface that is convex and opposite the eye-ward facing surface; a curved lightguide disposed between the eye-ward facing and world facing surfaces to guide the display light via total internal reflections from the input surface to the viewing region; a first lens body on which the input surface is disposed and in which the curved lightguide extends from the input surface to a transition surface, wherein the transition surface is disposed at a transition between a thin portion of the first lens body and a thick portion of the first lens body; and a second lens body having a thin portion, a thick portion and a transition surface and being mated to the first lens body, wherein the transition surface of the second lens body is disposed at a transition between the thin portion and the thick portion of the second lens body, and wherein an eye-ward facing surface that is concave; a world facing surface that is convex and opposite the eye-ward facing surface; a curved lightguide disposed between the eye-ward facing and world facing surfaces to guide the display light via total internal reflections from the input surface to the viewing region; a first lens body on which the input surface is disposed and in which the curved lightguide extends from the input surface to a transition surface, wherein the transition surface is disposed at a transition between a thin portion of the first lens body and a thick portion of the first lens body; and a second lens body having a thin portion, a thick portion and a transition surface and being mated to the first lens body, wherein the transition surface of the second lens body is disposed at a transition between the thin portion and the thick portion of the second lens body, and wherein an optical combiner is disposed along an interface between the transition surfaces of first and second lens bodies (125, 130) at the viewing region to redirect the display light towards the eye-ward direction for output from the curved lightguide; characterized in that the optical combiner includes a two-dimensional grid pattern of reflective elements formed on one or both of the transition surfaces (415, 430), the reflective elements being separated by interstitial regions, comprising gaps on the respective transition surface between the reflective elements in a two-dimensional grid pattern; wherein the reflective elements reflect the display light and the interstitial regions pass ambient light incident through the world facing surface such that the viewing region is partially see-through.