An efficient human–computer interface is very important to improve the autonomy of people with tetraplegia allowing the control of power wheelchairs, computers, smartphones or other computerized appliances.
To evaluate LCS as a computer input device, it was configured as a Bluetooth standard mouse(compatible with computers and smartphones), but with the purpose of controlling power wheelchairs as well.
Computer input devices have been deeply studied [30]–[32] and there are effective methods to evaluate their interface efficiency, such as Fitts’ law [28] (standards in ISO/TS 9241-411:2012[29] that revises ISO9241-9:2000)that is widely used. The main measure for comparing computer input devices is the throughput TP in bits/s [30] from a human to a computer,
and it is calculated as: