A programme of research into the likelihood of damage to operators' eyes resulting from the increasing use of visual display units was recently commissioned by the Association of Optical Practitioners. In general the study by two members of the A.O.P. Occupational Visual Welfare Committee, S. Rosenthal and J. Grundy, showed that no evidence existed of damage or harmful effects on eye-sight as a result of visual display unit work or the radiation effects of visual display units. Their report, a shortened version of which follows, will be of interest to engineers concerned with the design or application of v.d.u.s.