Tera has a disorder that is untreatable and produces blindness and muscle degeneration prior to death.Her diagnosis would be

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Tay-Sachs disease is an untreatable genetic disorder that results in the progressive degeneration of nerve cells in the brain and spinal cord. This leads to blindness and muscle degeneration, and ultimately death. The disorder typically appears in infancy or early childhood. Fragile X syndrome, Klinefelter's syndrome, and hemophilia do not produce these symptoms.

Tera Has a Disorder That Is Untreatable and Produces Blindness