Researchers have discovered a way to revive eyes from organ donors after death, an advance that opens doors to progress against age-related macular degeneration, glaucoma and other major causes of blindness.
The accomplishment, which many experts hadnโt thought possible, gives scientists the ability for the first time to conduct experiments on a functioning human retina, potentially unlocking a treasure trove of new information about the chemistry of vision and what goes wrong in the intricate network of retinal cells when people start losing their sight.
The achievement also may help advance prospects for eye transplants, though Dr. Hanneken cautioned that such potential treatments are many years away. Doctors for decades have been able to transplant corneas from donor eyes, but that outer layer of the eye that helps with focus doesnโt have a blood supply and isnโt directly connected to retinal neurons that send sight signals to the brain. Getting transplanted eyes or retinal tissue to communicate with the brain is a daunting challenge.
Researchers for decades have relied heavily on mouse studies to help understand the basis of human eye diseases. But mice donโt see in color. โThey donโt even have a macula, and they donโt get macular degeneration,โ said Dr. Hanneken, who is also a retinal surgeon at Scripps Memorial Hospital, La Jolla. โYou want a model that mimics the human disease.โ
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That was the motivation behind Dr. Hannekenโs six-year quest to bring dead eyes back to life. Trying to revive dead nerve cells challenged a basic belief that the death of neurons is irreversible.
