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- Blindness is the complete absence or
- impairment of sight. It may be caused by
- heredity, accident, disease, or deterioration
- with age. Education of the blind was begun
- using raised lettering in 1784. Aids to the
- blind include the use of the Braille and Moon
- alphabets in reading and writing. Guide dogs
- for the blind were first trained in Germany
- for soldiers blinded in World War I. Other
- aids include electronic devices that convert
- print to recognizable mechanical speech.
-
- Subject by: John Denver
-