  Mobile devices such as smartphones, smartwatches or smart glasses have
revolutionized how we interact. We are interested in smart glasses because they
have the advantage of providing a simultaneous view of both physical and
digital worlds. Despite this potential, pointing task on smart glasses is not
really widespread. In this paper, we compared four interaction techniques for
selecting targets : (a) the Absolute Head Movement and (b) the Relative Head
Movement, where head movement controls the cursor on smart glasses in absolute
or relative way, (c) the Absolute Free Hand interaction, where the forefinger
control the cursor and (d) the Tactile Surface interaction, where the user
controls the cursor via a small touchpad connected to smart glasses. We
conducted an experiment with 18 participants. The Tactile Surface and Absolute
Head Movement were the most efficient. The Relative Head Movement and Absolute
Free Hand interactions were promising and require more exploration for other
tasks.
