Stargardt's disease is best described as:

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Stargardt's disease is a macular dystrophy that primarily damages the central retina, so central vision deteriorates while peripheral vision remains relatively intact. This central loss is why it’s described as a degenerative eye disease with loss of the middle portion of the visual field. People often notice trouble with tasks that require sharp central vision—reading, recognizing faces, and seeing fine details—beginning in adolescence or early adulthood. Night vision and broad color discrimination are not the defining problems in Stargardt’s, which helps explain why the other descriptions don’t fit as well.