A 66-year-old Baltimore woman is preparing to take on the world's largest marathon even though she can no longer see the road ahead.

King was diagnosed with Retinitis Pigmentosa, a rare inherited disease that causes progressive vision loss. It began with trouble adjusting to dim light, then slowly narrowed her field of vision until, in 2024, she was declared legally blind.

But for Jackie King, seeing clearly has nothing to do with sight.

"I'm gradually losing my sight," King said. "At first, I didn't understand what was happening. The movie theater would seem darker, and my eyes wouldn't adjust."

Dr. Stephen Pappas of the LifeBridge Health Krieger Eye Institute said there's no cure for the disease, which damages the light-sensitive cells of the retina.

"Over time, the vision cells det

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