Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Retinal prosthesis trial completes first phase of testing

09.05.2003


One-year results presented at annual ophthalmology meeting



Researchers from the Keck School of Medicine of the University of Southern California, its Doheny Retina Institute and Second Sight, LLC, are reporting on the initial results of their groundbreaking, FDA-approved feasibility trial of an intraocular retinal prosthesis that appears to be able to restore some degree of sight to the blind.

"We have successfully completed enrollment and implantation of three patients in the trial," says Mark Humayun, M.D., professor of ophthalmology at the Keck School. "And we have found that the devices are indeed electrically conducting, and can be used by the patients to detect light or even to distinguish between objects such as a cup or plate in forced choice tests conducted with one patient so far."


The results are being presented at the Retinal Prosthesis I session of the annual meeting of the Association for Research in Vision and Ophthalmology, or ARVO, being held this week in Fort Lauderdale, Fla. Humayun, who is moderator of the session, is also presenting a paper detailing the results of the trial. In addition, he and his group from USC’s Doheny Retina Institute displayed six posters in sessions throughout the week. (Posters are embargoed until the time of their presentation.)

The microelectronic retinal prosthesis used in this first phase of the trial is intended to stand in for the damaged retinal cells in people suffering from such blinding diseases as retinitis pigmentosa and macular degeneration. The implant measures 4 millimeters by 5 millimeters, and is studded with 16 electrodes in a 4-by-4 array. The device has been developed by Sylmar, Calif.-based Second Sight, LLC: www.2-sight.com

The first participant in the trial underwent surgery to receive the implant in February of 2002. Patient #2 received the implant in July 2002, and patient #3 underwent surgery in March of 2003.

The retinal prosthesis-a sliver of silicone and platinum that is often incorrectly referred to as an ’eye chip’-is attached to and sits atop the retina. It works by electrically stimulating the remaining healthy retinal cells via the array of electrodes; the retinal cells, in turn, pass on the visual information to the brain via the optic nerve.

Initial tests in the three implanted patients have shown that they can perceive light on each of the 16 electrodes. Testing conducted so far in some of the patients with the microelectronic implant revealed that they were capable of detecting when a light is turned on or off, describing the motion of an object, and even counting discrete objects.

The first tests of the prosthesis in all three patients involved computer-generated points of light sent directly to the implant, says Humayun. Over time, they were ’graduated’ to images received by an external video camera. These images are sent to the intraocular electrode array attached to the retina via a receiver that is implanted behind the patient’s ear during the implant surgery. The signal is then recreated by stimulating the appropriate electrodes in the prosthesis.

Testing on the three patients is ongoing, says Humayun. "We plan in the near future to look at how useful the prosthesis can be in activities of daily living," he notes.


In addition to Humayun, the researchers involved in this work include Keck School researchers Eugene de Juan Jr., M.D., Douglas Yanai, M.D., Manjunatha Mahadevappa, Ph.D., Gretchen van Boemel, Ph.D., Gildo Fujii, M.D., and James Weiland, Ph.D., as well as Robert Greenberg, M.D., Ph.D., president of Second Sight, LLC, and other Second Sight scientists.

The National Institutes of Health/National Eye Institute and Second Sight, LLC, provided funding to support the research and development of the retinal prosthesis implanted in this trial. The National Science Foundation, the Department of Energy, the Office of Naval Research, the Whitaker Foundation, The Foundation Fighting Blindness, the Defense Advanced Research Projects Agency and Second Sight, LLC, have provided other funding toward the development of a retinal prosthesis.

For copies of abstracts online, go to www.arvo.org and click on the annual meeting link. Posters relating to this paper were or will be displayed in poster sessions 5056 (B715), 5059 (B718), 5060 (B719), 5079 (B738), 5081 (B740), and 5085 (B744); posters are embargoed until the time of their presentation.

Jon Weiner | EurekAlert!
Further information:
http://www.arvo.org

More articles from Health and Medicine:

nachricht 3D images of cancer cells in the body: Medical physicists from Halle present new method
16.05.2018 | Martin-Luther-Universität Halle-Wittenberg

nachricht Better equipped in the fight against lung cancer
16.05.2018 | Friedrich-Alexander-Universität Erlangen-Nürnberg

All articles from Health and Medicine >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Explanation for puzzling quantum oscillations has been found

So-called quantum many-body scars allow quantum systems to stay out of equilibrium much longer, explaining experiment | Study published in Nature Physics

Recently, researchers from Harvard and MIT succeeded in trapping a record 53 atoms and individually controlling their quantum state, realizing what is called a...

Im Focus: Dozens of binaries from Milky Way's globular clusters could be detectable by LISA

Next-generation gravitational wave detector in space will complement LIGO on Earth

The historic first detection of gravitational waves from colliding black holes far outside our galaxy opened a new window to understanding the universe. A...

Im Focus: Entangled atoms shine in unison

A team led by Austrian experimental physicist Rainer Blatt has succeeded in characterizing the quantum entanglement of two spatially separated atoms by observing their light emission. This fundamental demonstration could lead to the development of highly sensitive optical gradiometers for the precise measurement of the gravitational field or the earth's magnetic field.

The age of quantum technology has long been heralded. Decades of research into the quantum world have led to the development of methods that make it possible...

Im Focus: Computer-Designed Customized Regenerative Heart Valves

Cardiovascular tissue engineering aims to treat heart disease with prostheses that grow and regenerate. Now, researchers from the University of Zurich, the Technical University Eindhoven and the Charité Berlin have successfully implanted regenerative heart valves, designed with the aid of computer simulations, into sheep for the first time.

Producing living tissue or organs based on human cells is one of the main research fields in regenerative medicine. Tissue engineering, which involves growing...

Im Focus: Light-induced superconductivity under high pressure

A team of scientists of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science in Hamburg investigated optically-induced superconductivity in the alkali-doped fulleride K3C60under high external pressures. This study allowed, on one hand, to uniquely assess the nature of the transient state as a superconducting phase. In addition, it unveiled the possibility to induce superconductivity in K3C60 at temperatures far above the -170 degrees Celsius hypothesized previously, and rather all the way to room temperature. The paper by Cantaluppi et al has been published in Nature Physics.

Unlike ordinary metals, superconductors have the unique capability of transporting electrical currents without any loss. Nowadays, their technological...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

Save the date: Forum European Neuroscience – 07-11 July 2018 in Berlin, Germany

02.05.2018 | Event News

Invitation to the upcoming "Current Topics in Bioinformatics: Big Data in Genomics and Medicine"

13.04.2018 | Event News

Unique scope of UV LED technologies and applications presented in Berlin: ICULTA-2018

12.04.2018 | Event News

 
Latest News

Supersonic waves may help electronics beat the heat

18.05.2018 | Power and Electrical Engineering

Keeping a Close Eye on Ice Loss

18.05.2018 | Information Technology

CrowdWater: An App for Flood Research

18.05.2018 | Information Technology

VideoLinks
Science & Research
Overview of more VideoLinks >>>