Wearable Artificial Vision Device May Help Legally Blind to Read

Author: American Academy of Ophthalmology
Published: 2016/10/28 - Updated: 2020/04/23
Category Topic: Disability Visual Aids - Academic Publications

Page Content: Synopsis - Introduction - Main

Synopsis: Artificial vision device may help people who are legally blind read, recognize faces, and accomplish everyday tasks with greater ease than traditional assistive reading devices. Study participants performed tests simulating activities of daily life, including recognizing products and reading emails, letters, newspapers, book and signs.

Introduction

Wearable artificial vision device shows promise in helping people who are legally blind to read - Study shows potential of assistive technology to improve quality of life for the visually impaired.

Main Content

Legal blindness is defined as a level of visual impairment that has been classified by law either to limit allowed activities (such as driving) for safety reasons or to determine eligibility for government-funded disability benefits in the form of educational, service, or monetary assistance. The World Health Organization (WHO) uses the following classifications of visual impairment. When the vision in the better eye with best possible glasses correction is:

• 20/30 to 20/60 : Mild vision loss, or near-normal vision.
• 20/70 to 20/160 : Moderate visual impairment, or moderate low vision.
• 20/200 to 20/400 : Severe visual impairment, or severe low vision.
• 20/500 to 20/1,000 : Profound visual impairment, or profound low vision.
• More than 20/1,000 : Near-total visual impairment, or near total blindness.
• No light perception : Total visual impairment, or total blindness.

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A unique wearable artificial vision device may help people who are legally blind "read" and recognize faces. It may also help these individuals accomplish everyday tasks with significantly greater ease than using traditional assistive reading devices, suggests a study presented today at AAO 2016, the 120th annual meeting of the American Academy of Ophthalmology.

Approximately 246 million people worldwide have low vision.(1) 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 hypothesized 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 is unique because it clips to glasses, making it hands-free. It features a miniature camera that sees and recognizes 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 10-item test simulating activities of daily life, including recognizing products and reading a variety of 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 10. 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 as follows:

• 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.

"While there have been many advances in eye care, the options for assistance in completing daily tasks are limited and cumbersome," said Elad Moisseiev, M.D., a vitreoretinal surgeon who was the study lead at U.C. Davis, but is now with the Tel Aviv Medical Center, Israel. "This represents a new step in the evolution of assistance devices for people with low vision, giving them hope for improving their functionality, independence and quality of life."

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 Dr. Moisseiev. He noted that additional studies should include more people, ideally stratifying them by level of visual impairment.

A Portable Artificial Vision Device is a Useful Aid for Patients with Low Vision was presented at AAO 2016, the 120th annual meeting of the American Academy of Ophthalmology. The event was held in conjunction with the Asia-Pacific Academy of Ophthalmology Oct. 14-18 at McCormick Place, Chicago. Known as the place "Where all of Ophthalmology Meets®," the Academy's annual meeting is the world's largest conference for eye physicians and surgeons.

Legally Blind: Facts and Statistics

• The WHO estimates that in 2012 there were 285 million visually impaired people in the world, of which 246 million had low vision and 39 million were blind. Of those who are blind 90% live in the developing world. Worldwide for each blind person, an average of 3.4 people have low vision, with country and regional variation ranging from 2.4 to 5.5.
• Visual impairment is unequally distributed across age groups. More than 82% of all people who are blind are 50 years of age and older, although they represent only 19% of the world's population. Due to the expected number of years lived in blindness (blind years), childhood blindness remains a significant problem, with an estimated 1.4 million blind children below age 15.
• More than 90% of the world's visually impaired live in developing countries.
• Studies indicate worldwide, and at all ages, females have a significantly higher risk of being visually impaired than males.
• In 1987, it was estimated that 598,000 people in the United States met the legal definition of blindness. Of this number, 58% were over the age of 65. In 1994--1995, 1.3 million Americans reported legal blindness.
• Since the estimates of the 1990s, new data based on the 2002 global population show a reduction in the number of people who are blind or visually impaired, and those who are blind from the effects of infectious diseases, but an increase in the number of people who are blind from conditions related to longer life spans.

1 - www.who.int/mediacentre/factsheets/fs282/en/

Attribution/Source(s): This quality-reviewed publication was selected for publishing by the editors of Disabled World (DW) due to its relevance to the disability community. Originally authored by American Academy of Ophthalmology and published on 2016/10/28, this content may have been edited for style, clarity, or brevity.