title: Functional visual fields: relationship of visual field areas to self-reported function.
abstract: The aim of this study is to relate areas of the visual field to functional difficulties to inform the development of a binocular visual field assessment that can reflect the functional consequences of visual field loss.
  
  
  
  Fifty-two participants with peripheral visual field loss undertook binocular assessment of visual fields using the 30-2 and 60-4 SITA Fast programs on the Humphrey Field Analyser, and mean thresholds were derived. Binocular visual acuity, contrast sensitivity and near reading performance were also determined. Self-reported overall and mobility function were assessed using the Dutch ICF Activity Inventory.
  
  
  
  Greater visual field loss (0-60°) was associated with worse self-reported function both overall (R2= 0.50; p < 0.0001), and for mobility (R2= 0.64; p < 0.0001). Central (0-30°) and peripheral (30-60°) visual field areas were similarly related to mobility function (R2= 0.61, p < 0.0001 and R2= 0.63, p < 0.0001 respectively), although the peripheral (30-60°) visual field was the best predictor of mobility self-reported function in multiple regression analyses. Superior and inferior visual field areas related similarly to mobility function (R2= 0.56, p < 0.0001 and R2= 0.67, p < 0.0001 respectively). The inferior field was found to be the best predictor of mobility function in multiple regression analysis.
  
  
  
  Mean threshold of the binocular visual field to 60° eccentricity is a good predictor of self-reported function overall, and particularly of mobility function. Both the central (0-30°) and peripheral (30-60°) mean threshold are good predictors of self-reported function, but the peripheral (30-0°) field is a slightly better predictor of mobility function, and should not be ignored when considering functional consequences of field loss. The inferior visual field is a slightly stronger predictor of perceived overall and mobility function than the superior field.
authors.affiliation: Anglia Ruskin University, Cambridge, UK.
authors.forename: Hikmat
authors.initials: H
authors.lastname: Subhi
authors.affiliation: Anglia Ruskin University, Cambridge, UK.
authors.forename: Keziah
authors.initials: K
authors.lastname: Latham
authors.affiliation: University of Hertfordshire, Hatfield, UK.
authors.forename: Joy
authors.initials: J
authors.lastname: Myint
authors.affiliation: Moorfields Eye Hospital NHS Foundation Trust, London, UK.
authors.forename: Michael D
authors.initials: MD
authors.lastname: Crossland
mesh_terms: D000368:Aged; D015350:Contrast Sensitivity; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011788:Quality of Life; D011932:Reading; D057566:Self Report; D012684:Sensory Thresholds / Q000502:physiology*; D011795:Surveys and Questionnaires; D015348:Vision, Binocular / Q000502:physiology*; D015354:Vision, Low / Q000175:diagnosis / Q000503:physiopathology*; D014792:Visual Acuity; D058609:Visual Field Tests; D014794:Visual Fields / Q000502:physiology*
keywords: mobility function; self-reported function; visual fields