title: Familial cold-induced transient diplopia.
abstract: BACKGROUND
  The major precipitants of intermittent diplopia secondary to a phoria breakdown include fatigue and illness.
  
  
  OBJECTIVE
  To describe cold-induced vertical diplopia in a mother and daughter.
  
  
  METHODS
  Retrospective report.
  
  
  RESULTS
  Mother and daughter both developed vertical diplopia after exposure to cold ambient temperatures. These symptoms remained stable over many years. Ocular motility examination suggested that the diplopia resulted from breakdown of a small vertical phoria.
  
  
  CONCLUSIONS
  Familial cold-induced vertical diplopia is a rare disorder of unclear etiology that need not be associated with underlying systemic disease.
authors.affiliation: Department of Ophthalmology, Centre Hospitalier de l'Universite de Montreal, Montreal, Quebec, Canada.
authors.forename: Katie
authors.initials: K
authors.lastname: Luneau
authors.forename: Claire
authors.initials: C
authors.lastname: Blais
authors.forename: Michael
authors.initials: M
authors.lastname: Brodsky
authors.forename: Dan
authors.initials: D
authors.lastname: Boghen
mesh_terms: D000328:Adult; D000368:Aged; D003080:Cold Temperature / Q000009:adverse effects*; D004172:Diplopia / Q000453:epidemiology* / Q000235:genetics / Q000503:physiopathology; D004215:Distance Perception / Q000502:physiology; D005260:Female; D005500:Follow-Up Studies; D020022:Genetic Predisposition to Disease; D006801:Humans; D012189:Retrospective Studies; D012720:Severity of Illness Index