Inclusion Criteria:  Age 18-80 Hand osteoarthritis according to the ACR criteria Hand pain of at least 30mm on a 100mm VAS Chronic hand pain  Exclusion Criteria:  Known inflammatory rheumatic diseases Psoriasis Seropositivity for rheumatoid factor of anti-CCP antibodies No understanding of the Dutch language Fibromyalgia (Following the ACR 2011 classification criteria) Neurological disorders Carpal tunnel syndrome Diabetes History of chemo- and/or radiotherapy Spinal surgery or spinal trauma with lasting complaints Cognitive impairment Pregnancy or breast-feeding Eye surgery Use of hard contact lenses for 3 or more months Presence of an implantable cardioverter-defibrillator (ICD), neurostimulator or pacemaker