The implanted telescope holds much promise for patients, typically elderly, who suffer from end-stage, age-related macular degeneration, or A.M.D., said Janet P. Szlyk, a member of the advisory panel. Dr. Szlyk is executive director of the Chicago Lighthouse for People Who Are Blind or Visually Impaired, a social services agency.

The device does not cure the disease, but it does improve visual acuity, she said. For example, a person who might usually see a blur when looking at a friend’s face might, with the help of the magnified image, see a blur only in the area of the person’s nose or mouth.

“People can use it to recognize faces in a social setting,” she said. ‘That’s a huge advance.”

The telescope is implanted in one eye for jobs like reading and facial recognition. The other eye, unaltered, is used for peripheral vision during other activities like walking. After implantation, extensive therapy is crucial, she said, to learn to deal with the different abilities of the eyes.

Ruth A. Boocks, 86, of Alpharetta, Ga., who received an implant of the device in March 2003 during clinical trials, said her brain learned to adapt quickly. Mrs. Boocks uses her new visual abilities in various ways  for instance, to read e-mail and the messages that scroll across the bottom of the screen when she’s watching television. “My goal was to read to the bottom of the eye charts,” she said. “But I didn’t quite make it.” (She has gotten to the third line from the bottom.)

“I feel like a young woman,” she added. “It’s opened a lot of opportunities for me.”

Henry L. Hudson, a retina specialist in Tucson, Ariz., and lead author of two papers on the telescope published in peer-reviewed journals, said the device was not for everyone with A.M.D. “Maybe only 20 out of every 100 candidates will get the telescope,” he said. “They may not be eligible because of the shape of their eyes,” or they may have another problem, like maintaining balance, that precludes their selection, he added.