Wearable helps legally blind people read and recognise faces
October 25, 2016
A wearable artificial vision device that may help people who are legally blind read and recognise faces was presented at last month’s annual meeting of the American Academy of Ophthalmology in Chicago.
It may also help these individuals accomplish everyday tasks with greater ease than using traditional assistive reading devices, suggests the study.
Approximately 246 million people worldwide have low vision. This sight loss impairs a person's ability to do simple daily tasks. Optical and electronic devices such as hand-held magnifiers, tele-microscopic glasses and computer and video magnifiers can help. But, typically these devices are bulky, cumbersome or not readily portable.
With recent advancements in wearable electronic devices and optical character recognition technology that converts images to computer-readable text, University of California, Davis researchers hypothesised that these newer technologies could help improve patients' ability to function in daily life. To test their theory, researchers asked a group of visually impaired patients to use a wearable artificial vision device to see its impact. They found that the device vastly improved patients' daily productivity.
The researchers used the Orcam My Eye for their study. The device clips to glasses, making it hands-free. It has a miniature camera that sees and recognises what the user is viewing, whether text or a face, and then reads what it is seeing to the user via a small bone-conduction earpiece. The user activates the device by simply pointing a finger to the object or text, tapping it or pressing a trigger button.
Researchers tested the device on 12 legally blind people, who all had a visual acuity of less than 20/200. Study participants performed a ten-item test simulating activities of daily life, including recognising products and reading various items such as emails, letters, newspapers, book and signs. They earned one point for the successful completion of each item, and a zero for each not completed. The total possible score was ten.
The researchers studied the participants at three stages. First, they observed the participants doing the tasks without the device, then while wearing it after receiving a 90- to 120-minute training session and finally after wearing the device for one week.
The researchers' findings were:
- Without wearing the device, the participants' average score was 2.5 out of 10.
- When they first tried the device, their average score improved to 9.5 out of 10.
- After a week of wearing the device, the average score of participants improved to 9.8 out of 10.
- Seven of the patients completed the test using other low-vision aids such as magnifying glasses, resulting in an average score of 6. When they switched to the portable device, their average score improved to 9.7.
The pilot study was the first to evaluate the device in people with low vision, establishing its efficacy and ease of use and demonstrating the achievement of statistically significant differences in test scores, said Moisseiev. He said that additional studies should include more people, ideally stratifying them by level of visual impairment.