  Around-device interaction techniques aim at extending the input space using
various sensing modalities on mobile and wearable devices. In this paper, we
present our work towards extending the input area of mobile devices using
front-facing device-centered cameras that capture reflections in the human eye.
As current generation mobile devices lack high resolution front-facing cameras
we study the feasibility of around-device interaction using corneal reflective
imaging based on a high resolution camera. We present a workflow, a technical
prototype and an evaluation, including a migration path from high resolution to
low resolution imagers. Our study indicates, that under optimal conditions a
spatial sensing resolution of 5 cm in the vicinity of a mobile phone is
possible.
