Utah teens make a vest that warns visually impaired people about objects around them The Acti-Vest uses ultrasonic sensors and vibration motors to guide the user A vest made by a group of Utah teens could help people who are visually impaired by warning them of objects that are around them using vibrations and last updated 2021-04-04 10:31:01-04 DRAPER, Utah â There are a variety of outdoor activities people can do to stay active, but it's not always easy for everyone. So, a group of students at Juan Diego Catholic High School took this thought and applied it to making something that could help people who are visually impaired.