This device was developed to enhance the lives of persons that are blind, by providing information that is not available to them by other means. It is a fact that non-sighted persons have a better sense of hearing and feeling by touch than people without this disability. The Sonar Vision glasses were developed to supplement this tactile information.
Higher pitch means closer obstacle.
Lower pitch means obstacle is further away. No pitch means no obstacle of obstacle is out of range. It is a problem to the sightless or near-blind peole to walk trough a simple door or to get on a bus. Because of this, the device may be unable to indicate small holes or other obstacles just in front of the user's feet. Beacuse of the technology applied, the device is light weight, and leaves both of its user's hand free.