Bionic eye planting improves vision of some patients with eye diseases

Release date: 2016-05-10


This may sound like something from Star Trek: doctors can implant a device in the patient's body that restores some of the central vision for those with limited peripheral vision left with advanced eye disease. The research team from the UK said that this is the first time that artificial and natural vision have been successfully integrated in humans.

The study was a preliminary small study involving only 4 cases of age-related macular degeneration (AMD). The team reported that the implant allows the patient to identify facial contours and facial features, such as whether the mouth is open or closed - such general life details, for patients such as AMD who are slowly being deprived of vision, it is already Long lost.

This week (May 3), the results of the study were published at the annual meeting of the Society for Visual and Ophthalmology Research (ARVO) in Seattle, Washington.

Age-related macular degeneration (AMD), as its name implies, is a degenerative change in the macula of the eye. The macula is located in a small area behind the eye, allowing you to see all the details clearly. AMD does not cause complete blindness, but it can lead to a loss of central vision, affecting daily activities such as the ability to recognize faces, reading or doing close-up work, such as cooking. The remaining peripheral vision does not provide the vision of this activity.

According to the US Centers for Disease Control and Prevention, AMD is the leading cause of vision loss in the United States. More than 2 million Americans have AM – according to government data, this number is expected to double by 2050. AMD is most common among people over 65 years of age. The cause of the disease is unknown, but the risk of developing the disease is largely influenced by smoking and heredity.

Doctors have successfully slowed the progression of AMD through dietary supplements including vitamin C, beta-carotene and other nutrients. Prescription drug injections can also be used to treat certain advanced AMDs. However, no treatment can reverse vision loss.

To restore central vision in 4 patients with advanced AMD, doctors implanted a device called the Argus II electronic retinal prosthesis in their eyes. This is a new commercial product whose early products can only restore a very limited vision to patients with rare degenerative eye diseases that only have light perception. The device is essentially a miniature camera attached to the back of the eye that captures the image and sends an electrical signal to the brain.

When the device was turned on to help patients see things, none of the patients reported "visual confusion." This is a phenomenon that deserves the attention of researchers because the brain simultaneously accepts natural impulses from the surrounding area of ​​the eye and artificial impulses from the central implant. They don't know how the brain interprets this phenomenon.
Another factor of success is that the implant does not appear to cause any problems in the patient, and the implant remains in their body for up to six months without signs of infection.

The researchers wrote that although previous implants have helped people with rare diseases, the latest findings suggest that "this is used to treat people over the age of 50 who have dry age-related macular degeneration." A new approach to severe vision loss... There are no viable treatments for this."

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Source: Noble

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