ABSTRACToptometrists, and 0.833, GPs). Almost no agreement was found for all the questions: a 32 statistically significant difference (Chi-square p<0.0001) was found between the 33 optometrists and GPs in the use of investigative techniques, associating symptoms, causes 34 of dry eye (p>0.0001), and dry eye symptoms, except for 'burning sensation of the eye' and 35 'irritation of the eye' as agreed symptoms, and agreement that dry eye is an age-related 36 disease. Estimates for the worldwide prevalence of DED give a range from as low as 0.1% to as high 61 as 33% [5]. In the Netherlands there is no prevalence data available, partly due to a lack of 62 consensus in defining DED. However, by using indirect measurements, an estimate of the 63 prevalence of the disease can be made. In 2013 there were 573,540 users (out of a 64 population of 17 million) in the Netherlands of prescribed artificial tears products, as 65 reported from the data bank of the Drug Information System of National Health Care 66 Institute (GIP 2013). This does not take into account the number of non-prescribed artificial 67 tears advised or patient self-management. Optometrists in the Netherlands can prescribe, 68 and advise on, over-the-counter artificial tears available on the Dutch market, and patients 69 can self-manage using over-the-counter artificial tears sold by pharmacists and drugstores. 70