What is Usher syndrome?

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  2. #called
  3. #worsens
  4. #retinitis
  5. #layer
  6. #partial
  7. #light
  8. #affects
  9. #characterized
  10. #which
  11. #condition
  12. #usher
  13. #disease
  14. #tissue
  15. #syndrome
  16. #vision
  17. #pigmentosa
  18. #retina
  19. #sensitive
  20. #caused
  21. #hearing