Results
Testing and evaluation
Our experiments aim to compare performance of a standard white cane with and without our device. Fifteenvisually impaired volunteers (nine males and six females)
with total blindness, aged between 20 and 50 years (mean age, 35.5; standard deviation, 9.6) were enrolled from the Thailand Association of the Blind. Information and
instructions on how to use iSonar were provided to users prior to commencing testing. This information included device limitations, coverage area, and tactile feedback.
Time was also given to volunteers to become familiar with the iSonar device.