|Document ID (ISN)||57274|
|ISSN - Serial title
||0025-7818 - Medicina del lavoro
|Convention or series no.
||Piccoli B., Gratton I., Perris R., Grieco A.
||Ergo-ophthalmological investigation at the workplace - Study of a group of VDU operators engaged in book-keeping work
||L'indagine ergoftalmologica sul campo: esempio di un intervento su di un gruppo di operatori video addetti a lavori di contabilitÓ amministrativa [in Italian]|
||July-Aug. 1988, Vol.79, No.4, p.288-297. Illus. 14 ref.
||Several investigators have put forward the hypothesis that even a single exposure to activities requiring prolonged visual effort at close range may cause transitory variations of ocular functions. These variations may be correlated to asthenopic symptoms and may indicate the risk of future irreversible variations. To verify this hypothesis, in a field study the variations of 3 parameters of visual function were examined (phorias, refraction, fusional convergence) before and at the end of the work day in 3 groups of 7 subjects: employees working with VDUs, employees engaged in conventional office work, workers not involved in visually demanding activities. The subjects were selected in order to be homogeneous as to age, sex and visual conditions (emmetropia, good ocular motility); further, the study was organised in such a way that exposure and environmental conditions were identical for all subjects. While phorias did not change significantly, refraction and convergence had small but consistent variations. Refraction showed a tendency towards an increase of accommodative tonus at long range and a decrease at close range, in both exposed groups. Fusional convergence decreased only in the VDU operator group.
||visual function disorders; ergonomics; visual display terminals
||epidemiologic study; visual fatigue
||D - Periodical articles
|Country / State or Province||Italy|
|Broad subject area(s)
||Diseases of the eye and vision damage
Visual display terminals (VDTs)