title: The symptomatic Pulfrich phenomenon can be successfully managed with a coloured lens in front of the good eye--a long-term follow-up study.
abstract: OBJECTIVE
  Many visual symptoms originating from a spontaneous Pulfrich phenomenon can be alleviated by the provision of a tinted lens worn in front of the least affected eye. Here, we report on the long-term outcome of four patients who have been provided with a uniocular tinted spectacle or contact lens.
  
  
  METHODS
  The case notes of four cases were reviewed. The review period was at least 5 years in all four cases.
  
  
  RESULTS
  In all cases, visual symptoms and perceptual difficulties occurring from the spontaneous Pulfrich effect were completely eliminated over a period of many years. In one case, the relief has been sustained over a 20-year period.
  
  
  CONCLUSIONS
  A uniocular tinted lens, or contact lens, provides immediate and lasting relief from the visual difficulties caused by the visual delay underlying the spontaneous Pulfrich effect.
authors.affiliation: Department of Vision Sciences, Glasgow Caledonian University, Glasgow, UK.
authors.forename: G
authors.initials: G
authors.lastname: Heron
authors.forename: K J
authors.initials: KJ
authors.lastname: Thompson
authors.forename: G N
authors.initials: GN
authors.lastname: Dutton
mesh_terms: D000328:Adult; D003116:Color; D003937:Diagnosis, Differential; D005139:Eyeglasses; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009039:Motion Perception; D009901:Optic Nerve Diseases / Q000523:psychology*; D009903:Optical Illusions; D010468:Perceptual Disorders / Q000175:diagnosis / Q000209:etiology / Q000628:therapy*; D016896:Treatment Outcome