The study of a correct lay-out of work places equipped with VDT/PC in call centres, if carried out before the beginning of work activities needs an interdisciplinary cooperation among OH&S operators. However, such a preventive evaluation can relevantly reduce onset and severity of asthenopic symptoms frequently reported by this kind of operators. Consequently, such preventive evaluation can avoid the necessity of carrying out those complex and expensive structural lay-out modifications, which are frequently needed to reduce VDT/PC workers' asthenopic symptoms.