[Measurement and evaluation of visual index in VDT operators under Multi-user system].
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.
Liao
G F
GF
Institute of Space Medico-Engineering, Beijing, China.
Zhong
H
H
Jiang
G H
GH
Mu
X F
XF
Wu
W C
WC
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