Figure 1.

Device construction and mechanics under deformation. a) Schematic illustration of the device layout in an exploded view. Optical images of a device b) held in the hands and c) mounted on the forehead; FEA results and optical image of a device subject to d) bending to a radius of curvature of 20 mm, e) twisting at an angle of 60°, and f) uniaxial stretching to a strain of 15%. The color in the FEA results represents the magnitude of logarithmic strains in the silicone and metal.