title: Visual field expansion in patients with retinitis pigmentosa.
abstract: BACKGROUND
  To determine the effectiveness of using spectacle-mounted prisms for field expansion in patients with retinitis pigmentosa (RP).
  
  
  METHODS
  Vision-related activities of daily living (V-ADL) questionnaire scores and functional visual field score (FFS) measurements were conducted before and after a one-month trial of spectacle-mounted prisms in those patients with RP who had residual central visual fields of less than 10 degrees.
  
  
  RESULTS
  16 patients were recruited who met study inclusion criteria. Mean V-ADL and FFS at baseline were 67.6 (73%) and 22.9 (46%), respectively. After a 1-month trial using spectacle-mounted prisms, V-ADL and FFS demonstrated significant improvement to 73.4 (80%, p < 0.05) and 27.0 (54%, p < 0.001), respectively.
  
  
  CONCLUSIONS
  Spectacle-mounted prisms effectively create visual field expansion and noticeable spatial orientation benefits in patients with RP. This may provide an adjunctive tool in low vision rehabilitation and should be considered in all cases with RP with less than 10 degrees of visual field.
authors.affiliation: Low Vision Service, University Health Network Hospitals, Department of Ophthalmology and Vision Sciences, University of Toronto, Tronto, Ont.
authors.forename: Sohel
authors.initials: S
authors.lastname: Somani
authors.forename: Michael H
authors.initials: MH
authors.lastname: Brent
authors.forename: Samuel N
authors.initials: SN
authors.lastname: Markowitz
mesh_terms: D000328:Adult; D000368:Aged; D003867:Depth Perception; D005139:Eyeglasses; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D012174:Retinitis Pigmentosa / Q000503:physiopathology / Q000628:therapy*; D011795:Surveys and Questionnaires; D016896:Treatment Outcome; D015354:Vision, Low / Q000503:physiopathology / Q000628:therapy*; D014792:Visual Acuity; D014794:Visual Fields / Q000502:physiology*