title: [Measurement and evaluation of visual index in VDT operators under Multi-user system].
abstract: OBJECTIVE
  To evaluate the visual function of the visual display terminal (VDT) operators under the Multi-user system.
  
  
  METHODS
  Subjective symptoms of the VDT operators under the Multi-user system were measured before and after work in the field study. Visual indices were measured at 8:15, 9:15, 10:15, 11:15, or 12:15 a.m.
  
  
  RESULTS
  No discomfort symptom was observed during the working time, and Longitudino-Kinetic visual acuity, and Critical flicker frequency didn't decrease. Refraction showed no significant decrease as compared with that at 8:15 except that of right eye measured at 12:15.
  
  
  CONCLUSIONS
  The Visual function of the VDT operators remained good in the Multi-user's system.
authors.affiliation: Institute of Space Medico-Engineering, Beijing, China.
authors.forename: G F
authors.initials: GF
authors.lastname: Liao
authors.forename: H
authors.initials: H
authors.lastname: Zhong
authors.forename: G H
authors.initials: GH
authors.lastname: Jiang
authors.forename: X F
authors.initials: XF
authors.lastname: Mu
authors.forename: W C
authors.initials: WC
authors.lastname: Wu
mesh_terms: D000293:Adolescent; D000328:Adult; D001248:Asthenopia; D016288:Computer Terminals; D003626:Data Display; D006804:Ergonomics; D005069:Evaluation Studies as Topic; D005425:Flicker Fusion / Q000502:physiology; D006801:Humans; D009900:Optic Nerve; D013997:Time Factors; D014785:Vision, Ocular / Q000502:physiology*; D014792:Visual Acuity