<prompt> Autistic disorder is characterized by all of the following , except:Visual impairmentLack of social InteractionStereotypical movementsDelayed development of speech  <response>: Autism is a pervasive developmental disorder characterized by impairment of social interaction. Other characteristic features of this disorder are repetitive motor activities or obsessions and impairment in verbal and nonverbal communication. It is not associated with visual impairment.Ref: Emergency Medical Technician Transition Manual By American Academy of Ohopaedic Surgeons, page 326. 