Nearly one in 30 Americans over the age of 40 experience low vision significant visual impairment that can not; be corrected with glasses, contact lenses, medication or surgery. However, in a new study of patients with retinitis pigmentosa; an inherited degenerative eye disease that results in poor vision, Keck School of Medicine of USC researchers found that adapted augmented reality (AR) glasses; can improve patients’ mobility by 50% and grasp performance by 70%.
“But current wearable low vision technologies using virtual reality are limited; and can be difficult to use or require patients to undergo extensive training,” said Mark Humayun, MD, Ph.D., director of the USC Dr. Allen and Charlotte Ginsburg Institute for Biomedical Therapeutics; codirector of the USC Roski Eye Institute and University Professor of Ophthalmology at the Keck School.
Augmented reality (AR) glasses
“However, using a different approach employing assistive technology to enhance; not replace, natural senses our team adapted augmented reality (AR) glasses that project bright colors onto patients’ retinas, corresponding to nearby obstacles,” Humayun said. Patients with retinitis pigmentosa wore adapted AR glasses; as they navigated through an obstacle course based on a U.S. Food and Drug Administration-validated functional test.
However, using video of each test, researchers recorded the number of times patients collided with obstacles; as well as the time taken to complete the course. But patients averaged 50% fewer collisions with the adapted AR glasses. Patients also asked to grasp a wooden peg against a black background; located behind four other wooden pegs without touching the front items.
However, patients demonstrated a 70% increase in grasp performance with the AR glasses. “Therefore patients with retinitis pigmentosa have decreased peripheral vision and trouble seeing in low light, which makes it difficult to identify obstacles and grasp objects. They often require mobility aids to navigate, especially in dark environments,” said Anastasios N. Angelopoulos, study project lead in Humayun’s research laboratory; at the Keck School.
Visual color cues
“Through the use of AR, they aim to improve the quality of life for low vision patients by increasing their confidence; in performing basic tasks, ultimately allowing them to live more independent lives,” Angelopoulos says. However, the AR system overlays objects within a 6-foot wireframe with four bright, distinct colors. But in doing so, the glasses provide visual color cues that help people with constricted peripheral vision interpret complex environments, such as avoiding obstacles in dimly lit environments.
However, to accomplish this, researchers used a process called simultaneous location and mapping; allowing the AR glasses to fully render the 3-D structure of a room in real time. However, the glasses then translated this information into a semitransparent colored visual overlay; which highlighted potential obstacles with bright colors to help patients with spatial understanding and depth perception. But this technology can work on commercially available devices.