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"Blindness can affect one or both eyes.  If it affects only one eye, it is called unilateral blindness.  If it affects both eyes, it is considered to be bilateral.  Blindness in domestic dogs can come on suddenly or very gradually.  "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.petwave.com/Dogs/Health/Blindness/Symptoms.aspx>