In addition, improvement on the coverage limit of the device should be done through some design modifications aimed at reducing the collision rate, especially with waistlevel
obstacles. However, when testing for safety and usefulness of the device, long-term testing needs to be conducted to examine possible side effects when the device is in use for a long period of time. Also, several experiments must be designed and carried out in order
to measure and compare the efficiency of iSonar with other existing electronic assistive devices for the visually impaired.