  We present a new mouse cursor designed to facilitate the use of the mouse by
people with peripheral vision loss. The pointer consists of a collection of
converging straight lines covering the whole screen and following the position
of the mouse cursor. We measured its positive effects with a group of
participants with peripheral vision loss of different kinds and we found that
it can reduce by a factor of 7 the time required to complete a targeting task
using the mouse. Using eye tracking, we show that this system makes it possible
to initiate the movement towards the target without having to precisely locate
the mouse pointer. Using Fitts' Law, we compare these performances with those
of full visual field users in order to understand the relation between the
accuracy of the estimated mouse cursor position and the index of performance
obtained with our tool.
