title: A novel computerized visual acuity test for children.
abstract: OBJECTIVE
  To investigate the efficacy of a computerized visual acuity test, the SNU visual acuity test for children.
  
  
  METHODS
  Fifty-six children, ranging from 1 to 5 years of age, were included. In a dark room, children gazed at and followed a circular dot with 50% contrast moving at a fixed velocity of 10 pixels/sec on a computer monitor. Eye movement was captured using a charge coupled device camera and was expressed as coordinates on a graph. Movements of the eye and dot were superimposed on a graph and analyzed. Minimum visualized dot diameters were compared to the Teller visual acuity.
  
  
  RESULTS
  Ten eyes (8.9%) of six children failed to perform the Teller visual acuity test, and two eyes (1.8%) of one patient failed to perform the SNU visual acuity test. The observed Teller visual acuity and SNU visual acuity were significantly correlated (p < 0.001). Visual angle degrees converted from the Teller visual acuity and SNU visual acuity were also significantly correlated (p < 0.001).
  
  
  CONCLUSIONS
  The SNU visual acuity using moving targets correlated well with Teller visual acuity and was more applicable than the Teller acuity test. Therefore, the SNU visual acuity test has potential clinical applications for children.
authors.affiliation: Department of Ophthalmology, Hallym University College of Medicine, Chuncheon, Korea.
authors.forename: Young Joo
authors.initials: YJ
authors.lastname: Shin
authors.forename: In Bum
authors.initials: IB
authors.lastname: Lee
authors.forename: Won Ryang
authors.initials: WR
authors.lastname: Wee
authors.forename: Jin Hak
authors.initials: JH
authors.lastname: Lee
authors.forename: Jeong-Min
authors.initials: JM
authors.lastname: Hwang
mesh_terms: D002675:Child, Preschool; D003936:Diagnosis, Computer-Assisted / Q000379:methods*; D005260:Female; D006801:Humans; D007223:Infant; D008297:Male; D011446:Prospective Studies; D014786:Vision Disorders / Q000175:diagnosis*; D014787:Vision Tests / Q000379:methods*; D014792:Visual Acuity
keywords: Child; SNU dot visual acuity test; Teller visual acuity test; Visual acuity test; Visual angle