\section{Conclusion}
\label{conclusion}

This paper presented two human subject studies aimed at better understanding the role of visuo-haptic rendering of the hand during virtual object manipulation in OST-AR.
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The first experiment compared six visual hand renderings in two representative manipulation tasks in AR, \ie push-and-slide and grasp-and-place of a virtual object.
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Results show that a visual hand rendering improved the performance, perceived effectiveness, and user confidence.
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A skeleton rendering, providing a detailed view of the tracked joints and phalanges while not hiding the real hand, was the most performant and effective.
