WITH SOME STRUCTURE, STEM CELLS MIGHT STILL STOP VISION LOSS

GETTING OLDER IS supposed to give you perspective. But for one out of five people over the age of 65, it does the opposite. Macular degeneration is a common progressive eye condition, one that thins and breaks down a tissue behind the center of the retina. Without that tissue, the light-sensing cells it supports atrophy and die, making it impossible to get a clear picture of anything straight ahead of you—like, say, the faces of your loved ones or anything past your steering wheel. Treatments can slow the loss of vision, but there’s no way to reverse it.

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