Ophthalmologists at Rush University Medical Center implanted Artificial Silicon Retina (ASR) microchips in the eyes of five patients to treat vision loss caused by retinitis pigmentosa (RP). The implant is a silicon microchip 2mm in diameter and one-thousandth of an inch thick, less than the thickness of a human hair.
Four patients had surgery Tuesday, January 25. The fifth patient is scheduled for a later date.
Rush principal investigator Dr. John Pollack performed the surgeries with Dr. Kirk Packo, Dr. Pauline Merrill, Dr. Mathew MacCumber, and Dr. Jack Cohen. All are members of Illinois Retina Associates, S.C., a private practice group and are on the Rush faculty. Patients leave the hospital the same day and will be followed for two years as part of the study, and then indefinitely.
The patients were recruited from a pool of about 5,000 applicants.
The implants are designed for people with retinal diseases such as macular degeneration and retinitis pigmentosa, which cause blindness and vision impairment in about 10 million Americans. More than one million of these people are legally blind.
"As is commonly seen in with retinitis pigmentosa, these patients all have severe narrowing of their visual fields down to a very small central circle, and all patients in the study are legally blind," says Pollack.
The Artificial Silicon RetinaTM (ASR) was invented by Dr. Alan Chow, pediatric ophthalmologist and Rush faculty member, who developed the chip and founded Optobionics, with his brother Vincent, vice president of engineering. Optobionics is located in Naperville, Illinois.
"This is an expansion of the study of the first 10 patients completed in 2002," says study investigator Dr. Kirk Packo, who oversees the three participating sites. The sites are Johns Hopkins School of Medicine, Baltimore, Emory University School of Medicine/Atlanta VA Medical Center and Rush.
Pollack says the current protocol has been modified to reduce the likelihood of inadvertant scientific bias. "We operated on the right eye of each of the initial 10 patients. For the next 20 patients we will randomly select which eye will receive the ASR chip. In addition, post-operative vision testers will be masked as to which eye received the ASR chip implant. The current study is being performed at these study centers in order to independently validate previous studies performed by Optobionics."
The first 10 patients all reported some degree of improvement in visual function, says Pollack. "Improvement in visual function was variable and included the ability to read letters, improvement in color vision, and expansion of their visual field. Some patients gained new ability to recognize facial features -- something that they were unable to do before ASR chip implantation. Some patients have experienced improvement in activities of daily living such as improved ambulation-not bumping into objects around the house, and reading the time on a clock."
Still in Phase II clinical trials, Pollack cautions it is still too early to determine what percentage of patients might experience improvement in vision and what resolution capability these patients might eventually have. "Although we hope that all patients receiving the chip will experience some improvement in visual function, we can't say for sure how these patients will respond to this new treatment since this is still an experimental trial. If this study and future studies show safety and efficacy of the chip and it's approved by the FDA, it could be as soon as three to five years that this technology would be available to others."