title: Visual Ability Score -- a new method to analyze ability in visually impaired children.
abstract: OBJECTIVE
  We analyzed the correlation between the Preferential Looking (PL) acuities and the Visual Ability Scores (VAS) of 600 patients (many with severe retinopathy of prematurity) to determine their ability to perform various activities within the daily environment.
  
  
  METHODS
  Visual acuity was measured by PL. Sixteen visual activities within the environment were analyzed. The VAS (range, 1-16) were calculated from the results of each activity and correlated with PL acuity.
  
  
  RESULTS
  The PL acuities of the 600 patients ranged from 20/20 (1.0) to <20/3200 (0.006) [mean, 20/337(006)]. The VAS ranged from 1 to 16 points (mean, 10.65; SD, +/-4.80) and showed a high correlation with the PL acuities (r=0.917, p=0.0001).
  
  
  CONCLUSIONS
  In addition to PL vision testing, analyzing the environmental visual behavior of young, severely visually impaired patients is important to accurately evaluate visual abilities. We found the VAS to be an important aid for low-vision specialists, especially for those with no access to a vision evaluation system such as PL.
authors.affiliation: Children's Vision Center, Schepens Eye Research Institute and the Schepens Retina Associates, Boston, Mass 02114, USA.
authors.forename: O
authors.initials: O
authors.lastname: Katsumi
authors.forename: S G
authors.initials: SG
authors.lastname: Chedid
authors.forename: J K
authors.initials: JK
authors.lastname: Kronheim
authors.forename: R K
authors.initials: RK
authors.lastname: Henry
authors.forename: C M
authors.initials: CM
authors.lastname: Jones
authors.forename: T
authors.initials: T
authors.lastname: Hirose
mesh_terms: D000203:Activities of Daily Living; D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D014786:Vision Disorders / Q000209:etiology / Q000503:physiopathology*; D014787:Vision Tests / Q000379:methods*; D014792:Visual Acuity / Q000502:physiology*; D019987:Persons with Visual Disabilities