Dawn I am not aware of any specific regulations or guidance on this, but this is not in my normal area of expertise. You might find it helpful to speak to an ophthalmologist to see what they say. Chris Chris Packham FRSPH, FInstSMM, MCMI, MIIRSM, MBICSc EnviroDerm Services Unit 10, Building 11, The Mews, Mitcheldean, GL17 0SN Tel: +44 1386 832 311 (office), Mobile: +44 7818 035 898 www.enviroderm.co.uk ******************************** Please remove this footer before replying. OCC-HEALTH ARCHIVES: http://www.jiscmail.ac.uk/lists/occ-health.html CONFERENCES AND STUDY DAYS: http://www.jiscmail.ac.uk/cgi-bin/filearea.cgi?LMGT1=OCC-HEALTH