title: Assessment of function related to vision (AFREV).
abstract: OBJECTIVE
  To evaluate the relationship of a performance-based measure of visual functioning to clinical and subjective measures in glaucoma patients.
  
  
  METHODS
  Cross-sectional survey of glaucoma patients.
  
  
  METHODS
  Forty-three patients with primary open-angle glaucoma.
  
  
  METHODS
  Patients were evaluated using a novel performance-based measure, the Assessment of Function Related to Vision (AFREV), standard clinical tests of visual function, and the National Eye Institute's Visual Functioning Questionnaire (NEI-VFQ-25), a self-reported quality of life measure. Correlations of the AFREV scores with visual field scores, monocular and binocular visual acuity, contrast sensitivity scores, and NEI-VFQ scores were calculated. Rasch analysis was used to estimate the visual ability required by each task of AFREV for a particular response (item measures) and to estimate the visual ability of each patient (person measures).
  
  
  METHODS
  AFREV and NEI-VFQ total scores.
  
  
  RESULTS
  The AFREV total scores were highly correlated with contrast sensitivity (r = 0.772), binocular visual acuity (r = -0.768), better-eye visual acuity (r = -0.737), worse-eye visual acuity (r = -0.675), and Estermann visual field efficiency scores (r = 0.606) as well as with NEI-VFQ scores (r = 0.70). The resulting index, constructed from 5 items of the AFREV, is unidimensional, thereby satisfying the primary assumption of the Rasch model. The Rasch person-item map demonstrates that the "putting stick into holes" and "reading small print" tests require the most visual ability.
  
  
  CONCLUSIONS
  The AFREV performance-based measure, a new test of a spectrum of activities, correlates well with some standard measures of visual function and certain aspects of self-report assessments. AFREV appears to be a valid measure of performance ability that may provide information not obtainable from standard measures of visual function or subjective surveys.
authors.affiliation: Wills Eye Hospital/Jefferson Medical College, William & Anna Goldberg Glaucoma Service & Research Laboratories, Philadelphia, PA 19107, USA.
authors.forename: Undraa
authors.initials: U
authors.lastname: Altangerel
authors.forename: George L
authors.initials: GL
authors.lastname: Spaeth
authors.forename: William C
authors.initials: WC
authors.lastname: Steinmann
mesh_terms: D000203:Activities of Daily Living; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D015350:Contrast Sensitivity; D003430:Cross-Sectional Studies; D005260:Female; D005500:Follow-Up Studies; D005902:Glaucoma, Open-Angle / Q000503:physiopathology* / Q000523:psychology; D006801:Humans; D008297:Male; D008875:Middle Aged; D011788:Quality of Life; D012189:Retrospective Studies; D011795:Surveys and Questionnaires; D014785:Vision, Ocular / Q000502:physiology*; D014792:Visual Acuity