title: [Effects of short-term VDT usage on visual functions].
abstract: OBJECTIVE
  To evaluate the effects of short-term VDT usage on visual functions.
  
  
  METHODS
  Visual function of the video display terminal (VDT) operators before and after 1 hour VDT usage were assessed. These included refraction, amplitude of accommodation, near point of convergence, AC/A, phorias, fusional convergence and divergence, tear film break time (BUT) and aberrations. And the same situation was compared was the non-VDT usage.
  
  
  RESULTS
  In comparison with pre-VDT use, amplitude of accommodation, BUT were significantly decreased (P < 0.05), near point of convergence, near lateral exophoria were significantly increased after VDT use (P < 0.05). Total, high order, 4th and 5th order aberrations were significantly greater after VDT use (P < 0.05).
  
  
  CONCLUSIONS
  Short-term VDT work does have a significantly greater temporarily effect on visual function, tear film quality and visual quality.
authors.affiliation: Department of Ophthalmology, Eye Ear Nose & Throat Hospital, Fudan University, Shanghai 200031, China. quxiaomei2002@126.com
authors.forename: Xiao-mei
authors.initials: XM
authors.lastname: Qu
authors.forename: Ren-yuan
authors.initials: RY
authors.lastname: Chu
authors.forename: Lin
authors.initials: L
authors.lastname: Wang
authors.forename: Pei-jun
authors.initials: PJ
authors.lastname: Yao
authors.forename: Jing-rong
authors.initials: JR
authors.lastname: Liu
mesh_terms: D000293:Adolescent; D000328:Adult; D016288:Computer Terminals; D005260:Female; D006801:Humans; D008297:Male; D009216:Myopia / Q000503:physiopathology; D013285:Strabismus / Q000503:physiopathology; D015357:Vision Disparity / Q000502:physiology; D014785:Vision, Ocular / Q000502:physiology*; D014792:Visual Acuity / Q000502:physiology*; D055815:Young Adult