An apparatus for head-mounted displays may include (i) a flexible planar support frame, (ii) a left eye cup coupled to a left side of the flexible planar support frame and a right eye cup coupled to a right side of the flexible planar support frame, (iii) left-eye and right-eye display screen areas mounted to the flexible planar support frame such that the left-eye display screen area projects toward a left eye aperture defined by the left eye cup and the right-eye display screen area projects toward a right eye aperture defined by the right eye cup, and (iv) a deflection sensor coupled to the flexible planar support frame that generates a deflection signal describing an extent to which the support frame is bent, where images displayed by the left-eye and right-eye display screen areas are normalized based on the deflection signal. Various other devices, systems, and methods are also disclosed.