A virtual reality (VR) headset includes an electronic display element, an optics block, and an adjustment mechanism. The electronic display element outputs image light. The optics block includes a cone and an additional cone coupled to a lens and an additional lens, respectively. Image light is directed to the lens and to the additional lens via the cone and additional cone, respectively. Each of the cones comprises an opaque material that is deformable to adjust a distance from a base portion of a cone to a top portion of a cone may be adjusted, via, compression, elongation, or both. An adjustment mechanism may receive input from a user and configured to adjust the distance one or more of the cone and the additional cone.