This study examined the clinical findings of visual display terminal (VDT) users who presented with monocular symptoms. The sample consisted of 35 people performing sustained work at VDTs. Each subject un- derwent an evaluation that included: visual acuities, determination of refractive status, ocular motor testing, the stability of fixa- tion, degree of suppressions of simulta- neous binocular perception, and ocular health status. These findings were com- pared to a control group of 100 subjects who did not habitually use a VDT. Signifi- cant signs of unstable fixation/suppression were found with symptomatic subjects, as compared to the controls. We also found initial visual acuity differences between the two eyes of the VDT user group, but no sig- nificant refractive.
